MR-DX

Transcription

1 DIRECT EXPANSION CLOSE CONTROL UNIT WITH REMOTE CONDENSER MR-DX INSTALLATION, OPERATION AND MAINTENANCE MANUAL GENERAL THIS MANUAL CONTAINS THE FOLLOWING SECTIONS WHICH ARE TO BE CONSIDERED AN INTEGRAL PART OF THE WHOLE AND ARE THEREFORE NOT TO BE DETACHED G4D2GB-3 R4D2GB-3 E4D2GB-3 F4D2GB-3 C4D2GB-3 General Information Reception Electrical connections Start-up Controls M4D2GB-3 L4D2GB-3 P4D2GB-3 N4D2GB-3 K4D2GB-3 Routine maintenance Water connections Refrigerant pipes Air filters Residual risks The contents of this manual are designed to assure the correct installation, adjustment and maintenance of the unit; therefore: - read the instructions with due care and attention; - the appliance must be installed, tested and serviced by properly qualified personnel (law n.45, ) licensed in accordance with established legislation. The manufacturer declines all liability, and guarantee coverage is automatically waived, if electrical and/or mechanical modifications are made to the unit. Tampering and unauthorized repairs or modifications to the unit will automatically void the guarantee. Observe the safety regulations in force at the time of installation. Make sure that the characteristics of the mains network conform to the data on the serial number plate inside the electrical panel. IMPORTANT Conserve this manual and the circuit diagram with care. Make sure that they are available for consultation by the operator whenever necessary. Packing materials (plastic wrappings, expanded polystyrene, nails, etc.) are potentially hazardous and must be kept out of reach of children. Recycle packing materials in accordance with local bylaws. The water chiller must be used only for the purpose for which it is designed. The manufacturer bears no responsibility in the case of applications other than the specified use. Disconnect the unit in the case of breakdowns or malfunctions. If repairs are necessary use only Clivet-approved service centres and always insist on original spare parts. The use of non-original parts and/or unauthorized service centres may result in unsafe operation of the unit. The manufacturer declines all liability for direct or indirect damage to property or injury to persons resulting from failure to adhere to the instructions in this manual. ADDITIONAL SAFETY PRECAUTIONS This unit has been especially designed and manufactured so to prevent any risk to persons and health hazard. For this reason, design solutions fit to eliminate (where possible) any cause of risk and sensibly reduce the probability of danger have been adopted. Please refer to the Residual risks section of this manual and strictly observe the behaviour prescriptions listed there in order to prevent any possible risk that hasn t been possible to avoid in the design stage. C. Art. M24D40G3-03 G4D2GB-33

2 GENERAL SPECIFICATIONS Sizes Standard voltage 400/3/50 Cooling capacity (1) kw Sensible capacity (1) kw Compr.input power (1) kw Compressor type Scroll N of compressors 1 Total oil quantity kg Handling zone Frontal surface m N of rows 3 4 Fin space mm 1.8 Coonections Gas connection mm Liquid connection mm Condensate drain mm 22 Handling zone fans (Outlet) N of fans 1 2 Fan diametre mm RPM rpm Standard air flow l/s Single motor input kw Max. ext. static press. Pa 50 Max. ext. static press. (2) Pa Standard unit weight Shipping weight (3) kg Lenght mm Depth mm 490 Height mm 1800 Sound levels Sound Pressure Level (4)dB(A) The data refers to the following conditions: 1) Ambient air 24 C BS/ 16,9 C BU Relative humidity 50% External air 35 C Standard static pressure 50Pa 2) With standard ventilating section, upon request. Contact our sales office for further details. 3) Data refers to the version with outlet downwards. 4) Sound pressure level refers to 1 metre from the outside surface of the unit operating in an open field (version with outlet downwards) 2

3 POSITIONING The units are designed for indoor installation. Make sure that the supporting surface is perfectly level and able to bear the full weight of the unit (see general specifications). Interpose a layer of rubber sheeting between the base of the unit and the supporting surface (to reduce noise and vibration). Observe the specified functional clearances. ACCESSORIES The units can be fitted with the following accessories (upon request): - Electric heating coil Electric heating section made from reinforced aluminium heaters with integral fins, 2 stage operation and safety thermostat. - Water heating coil Extra heating coil with 3-way balancing control valve supplied by external hot water. - Hot gas post-heating Used to maintain the desired room temperature in the event of an increase in relative humidity, adding sensible heat to the air which has already been cooled and dehumidified. Operation occurs by advantageously exploiting part of the hot gas taken from the compressor discharge, conveying it to a coil located downstream of the cooling section. - Steam humidifier Immersed electrode steam humidifier with electronic controller featuring proportional control fitted with humidity probe on the air intake and steam distributor. - Differential pressure switch for dirty air filters Differential pressure switch suitable for measuring a pressure difference between the air intake and outlet in the filter section. In the event where the differential pressure is greater than the set value, a remote alarm is signalled. - Soundproofing panels The panels are lined on the inside with micro-perforated metal plate for the maximum sound insulation. - Serial communication module to PC or BMS Serial connection kit for connecting the unit control module to a centralised control system (PC or BMS). - Phase monitor Used to check the presence and the correct sequence of the phases of the power supply. - Flooding sensor Floor water sensor to detect leaks from the water circuit, with remote alarm. - Adjustable support frame Height adjustable support frame using painted telescopic columns (RAL 7016). Adjustment is possible from mm or from mm. - Adjustable support frame with duct Height adjustable support frame using painted telescopic columns (RAL 7016), fitted with aluminium deflector that deviates the flow of air leaving the unit. Adjustment is possible from mm or from mm. - Front outlet plenum Plenum for front air discharge, outlets with double row of painted "aluzink" adjustable fins (RAL7016). - Outlet plenum on three sides Plenum for air discharge from three sides, outlets with double row of painted adjustable fins (RAL 7016). - Clock Programmable clock for automatic starts, set point changes and time band settings. - Condensate drain pump The condensate drain pump is used to discharge the water present in the pan to the outside, when the outside discharge point is higher than the pan. The pump is controlled automatically by a built-in level sensor. - Isolating damper The air outlet damper, controlled by an actuator with spring return, isolates the unit when it is not in operation. - EU5 air filter Filter made up of a galvanised plate frame with galvanised and electric-welded protective mesh, and regenerable filtering media made from polyester fibre sized with synthetic resins. Efficiency F5 according to CEN-EN 779 standard (classification EU5 according to Eurovent 4/5 average colorimetric efficiency between 40% and 60% ASHRAE Atm). Self-extinguishing (resistance to flame class 1 - DIN 53438). - Liquid line solenoid valve Solenoid valve used to prevent the unwanted migration of refrigerant during inactivity. 3

4 AIR INTAKE CONFIGURATIONS 1 2 Possible configurations: 1 = outlet downwards with intake from the front (M3 or D) 2 = outlet upwards with intake from the front (M5 or U) WARNING: When positioning the unit, leave enough space at the front to inspect the air filters and all the components subject to checks. To the side of the fittings leave enough space for connections and checks. 4

5 AIR OUTLET DIMENSIONS A A B B SEZ. A-A /41 D E F SEZ. B-B 61-71/81 E F G A B C A B C B D H I I = air outlet downwards II = air outlet upwards Sizes Dimensions A B C D E F G H I

6 REMOVAL OF THE PANELS Legend: 1) outlet grill for the version with outlet upwards 2) to remove the side panels, unscrew the 4 inner screws 3) right side panel 4) service panel (can be drilled for connections) 5) service connection 6) inside bottom panel 7) outside bottom panel 8) outside top panel (single piece with the outside bottom panel for sizes ) 9) left side panel 6

7 UNIT WITH ONE FAN, INSIDE VIEW ( ) Legend: 1) control panel 2) main isolator switch 3) LCD display 4) electrical panel 5) humidity probe (optional) 6) inlet air temperature probe 7) liquid gauge 8) heater section (optional) 9) hot water or hot gas coil (optional) 10) air filter (optional EU5) 11) evaporating coil 12) steam humidifier (optional) 13) flow differential pressure switch 14) filter differential pressure switch (optional) 15) liquid line solenoid valve (optional) 16) dewatering filter 17) bypass cock 18) hot water control valve 19) outlet fan 20) compressor 21) user terminal block (with Isolert3+ option) 22) outlet air temperature probe (optional) 23) power supply input and connections 7

8 UNIT WITH TWO FANS, INSIDE VIEW ( ) Legend: 1) control panel 2) main isolator switch 3) LCD display 4) electrical panel 5) humidity probe (optional) 6) inlet air temperature probe 7) liquid gauge 8) heater section (optional) 9) hot water or hot gas coil (optional) 10) air filter (optional EU5) 11) evaporating coil 12) steam humidifier (optional) 13) flow differential pressure switch 14) filter differential pressure switch (optional) 15) liquid line solenoid valve (optional) 16) dewatering filter 17) bypass cock 18) hot water control valve 19) outlet fan 20) compressor 21) user terminal block (with Isolert3+ option) 22) outlet air temperature probe (optional) 23) power supply input and connections For details of the water and gas connections, see the corresponding sections Water connections and Refrigerant pipes. 8

9 OUTLET PLENUM (optional) B A C I = air outlet from the front II = air outlet on 3 sides Sizes Dimensions A x B x C x 490 x x 490 x x 490 x x 490 x450 The grills are double row (vertical - horizontal) and can be oriented as desired. 9

10 ASSEMBLY OF THE OUTLET PLENUM 1 2 Assembly phases: 1) unscrew the screws fastening the front grill 2) fasten the plenum to the unit at the points indicated in the figure, using the fastening screws supplied 3) replace the front grill 10

11 ADJUSTABLE SUPPORT FRAME (optional) Available in two heights, mm and mm A G R ASIZES N D EZ Z E DIMENSIONS N I x x H x x H x x H *B *C x x H E +D *F +G z x z y x z I = exploded diagram II = fastening the frame Legend: A) frame B) rear duct support bracket C) duct D) front or rear bracket E) adjustable leg F) duct side bracket G) side bracket * = with duct option + = with height option Assembly diagram X) M6 screws on inserts Y) Screw and bolt Z) Self-tapping screw 11

12 DIMENSIONS A B C Sizes A mm B mm C mm CLIVET S.p.A. - Z. I VILLAPAIERA - FELTRE (BL) Italy - Tel Fax sito web: The information presented in this manual is not binding and may be changed by the manufacturer without notice. All rights reserved.

13 DIRECT EXPANSION CLOSE CONTROL UNIT WITH REMOTE CONDENSER MR-DX INSPECTION UPON DELIVERY HANDLING HANDLING using a FORK LIFT TRUCK or SIMILAR HOISTING using a CRANE or SIMILAR STORAGE REMOVING THE PACKING POSITIONING RECEPTION CONTENTS: INSPECTION UPON RECEIPT The units are delivered in special protective packing. When it arrives check the unit has not been damaged during transport and that it has been supplied complete with all the parts specified in the order. If there is any visible damage make a note of it on the transport document, accompanied by the words: ACCEPTED WITH RESERVATIONS DUE TO OBVIOUS DAMAGE TO PACKING since the delivery free at factory includes cover for damage to be borne by the insurers in compliance with Italian law N 450 of limite di risarcibilità. IMPORTANT EVERY OPERATION DESCRIBED BELOW MUST BE CARRIED OUT IN COMPLIANCE WITH THE SAFETY REGULATIONS IN FORCE CONCERNING BOTH THE EQUIPMENT USED AND THE OPERATING PROCEDURES ADOPTED. WARNING ALWAYS MAKE SURE THE LIFTING CAPACITY OF THE EQUIPMENT USED IS SUITABLE FOR THE WEIGHT OF THE UNIT IN QUESTION BEFORE CARRYING OUT ANY HANDLING OPERATIONS. Unit weight table Size Downflow weight Kg Upflow weight Kg HANDLING HANDLING using a FORK LIFT TRUCK or SIMILAR Insert the forks in the wooden platform supplied with the unit Start lifting the unit, making sure that it is balanced and stable. Bear in mind that the heaviest part is where the compressor is installed. R4D2GB-3

14 2.2 - HOISTING using a CRANE or SIMILAR Insert the self-balancing fork in the long side of the wooden base supplied with the unit Place boards on the upper edges of the unit to protect against damage Gradually tension the lifting straps, checking that they remain in position Lift the unit, ensure that the unit is perfectly balanced and stable. Bear in mind that the heaviest part is where the compressor is installed. WARNING FOLLOWING THE ADVICE ON THE OUTSIDE OF THE CARDBOARD PACKING WILL ENSURE THE UNIT REMAINS IN PERFECT CONDITION AND OPERATES CORRECTLY, TO THE BENEFIT OF THE END USER. THIS ADVICE IS AS FOLLOWS : - HANDLE WITH CARE - KEEP DRY - UNDER NO CIRCUMSTANCES EVER PLACE OTHER OBJECTS ON TOP OF THE UNIT STORAGE - Store away from: direct sunlight, rain, sand and wind - Temperature: maximum 60 C, minimum -10 C - Maximum humidity: 90% REMOVING THE PACKING Remove the packaging, taking care to avoid damaging the unit Remove the brackets which hold the unit on the wooden platform using a 10 mm spanner Lift the unit off the platform Lower the unit to the ground in the installation point desired Check for any visible damage Dispose of the packing so that it is taken to specialist collection or recycling centres (respect the regulations in force) POSITIONING Check that the area where the unit is to be located is level and can support the weight involved Prepare the holes in the floor, in the ceiling and in the adjacent walls for all the service connections: air outlet, refrigerant pipes, humidifier water supply, condensate and humidifier drain, electrical cables. When required, position the support frame, adjust the height so that it corresponds to the raised floor, and check that it is level Make sure there is a suitable condensate discharge near the site where the unit is installed. If gravity draining is not possible, an electric condensate drain pump must be installed The doors and panels should be removed and positioned in a safe place to prevent them from being damaged during the various phases of installation. 5.5 The MR units with outlet upwards have been designed to discharge the air through an upper outlet with adjustable louvers. If an outlet duct is required, this should be fitted before all other connections to refrigerant pipes or the electrical line. All ducts fastened to the unit must be easily removable so as to allow access to the unit from above. CLIVET S.p.A. - Z. I VILLAPAIERA - FELTRE (BL) Italy - Tel (0439) Fax (0439) Web site The information presented in this manual is not binding and may be changed by the manufacturer without notice. All rights reserved.

15 DIRECT EXPANSION CLOSE CONTROL UNIT WITH REMOTE CONDENSER MR-DX ROUTINE MAINTENANCE ROUTINE MAINTENANCE UNIT WATER SYSTEM ELECTRICAL SYSTEM CONTENTS: AIR DUCTING FANS HUMIDIFIER HEATERS IMPORTANT MAKE SURE THE UNIT IS NOT CONNECTED TO THE POWER SUPPLY BEFORE STARTING ANY MAINTENANCE OR CLEANING OPERATIONS ROUTINE MAINTENANCE This section is intended for the end user and contains information that is extremely important to ensure the unit has a long, trouble free service life. Scrupulously carrying out the few simple operations described below at regular intervals can avoid the need for servicing by specialist personnel. The operations which need to be carried out do not require any special technical knowledge, involving the following simple checks on the components of the unit: - AIR FILTER CLEANING - EVAPORATOR COIL - STRUCTURE UNIT AIR FILTER CLEANING (SEE AIR FILTER SECTION) EVAPORATOR COIL IMPORTANT: accidentally touching the exchanger fins could cause minor cuts. This operation should be carried out using special gloves. It is essential for the evaporator coil to provide the maximum heat exchange. Consequently, the surface must always be kept free of dirt and deposits. Clean the coil, removing all impurities that may remain on the surface. Check that the aluminium fins are not damaged or bent, and if so, "comb" the coil using the special tool so as to restore the initial condition and ensure the optimum flow of air STRUCTURE - Check the condition of the parts forming the structure, paying particular attention to its steel components. - Treat any rusted points of the unit with paints designed to eliminate or reduce this problem. - Make sure that the unit s casing panels are mounted firmly in place. Poor mounting can cause abnormal vibrations and noise WATER SYSTEM CONDENSING DRAIN CONTROL It is recommended periodical checking of the drain condensing panel of the unit. The dust or calcareous residues could lead to obstructions ELECTRICAL SYSTEM - Make sure there are no cuts, cracks or other signs of deterioration indicating a possible loss of insulating capacity in the power cable that connects the unit to the distribution board. Contact an authorised service centre if any maintenance operations are required AIR DUCTING - Check that the fixing screws of the ducting and corresponding structures have not loosened. Loose screws are the source of vibrations and therefore noise. - Check any antivibration systems installed in the ducting to avoid vibration transmission FANS Before staring the unit each season, check the status of the fans. - Before starting the unit each season, check the fastening of the fans to the structure of the unit. - Also check that the impeller is perfectly aligned and has not become dangerously unbalanced, as highlighted by abnormal noise and vibrations. M4D2GB-3

16 HUMIDIFIER Components to be checked or replaced The steam humidifier has only one part that requires periodical replacement: the steam production cylinder. This operation is necessary when the lime scale that forms inside the cylinder prevents the sufficient flow of current. This situation is signalled on the control board by the LEVEL LED, which flashes. The frequency of this operation depends on the supply water: the more salt or impurities in the water, the more frequently the cylinder will need to be replaced. The following parts need to be checked annually: fill/drain solenoid valve: clean away any solid deposits, without using compressed air, and check correct operation. water circuit/supply tank: clean away any deposits in the path travelled by the water from the supply valve to the cylinder. Finally, check that there are no leaks or drips. steam outlet pipe/condensate drain: check that along the path, from the humidifier to the distributor in the duct or the room, the pipe is not choked, which would prevent the normal release of steam/condensate. humidity probes: check the condition of the probes, and if necessary, re-calibrate them. Do not use compressed air or solvents to clean the probe sensor. Warning: if placing the unit out of service, completely empty the water from the cylinder Replacing the cylinder To remove the cylinder, proceed as follows. Completely drain the water by pressing the DRAIN button on the control board. Disconnect the power supply to the humidifier using the isolating switch on the unit. Remove the steam pipe from the cylinder. Disconnect the electrical connections from the electrodes and remove the plugs from the high level electrodes. Unscrew the nut to remove the flare coupling and the filter (when the filter is outside the cylinder) Lift the cylinder to pull it out. Before replacing it: The filter body does not need to be replaced, consequently, wash it in water and reposition it on the new cylinder using the new gasket supplied with the latter. Check the gasket between the cylinder and the drain assembly. Replace the cylinder, repeating the same operations in the reverse order. 1 - pipe locking spring 2 - steam pipe 3 - fill pipe 4 - steam cylinder 5 - O-ring 6 - fill valve 7 - valve supports 8 - drain valve 9 - bottom sump 10 - pipe locking spring 11 - fill pipe 12 - overflow pipe IMPORTANT AUTHORISED PERSONNEL SHOULD BE PRESENT WHEN STARTING THE UNIT EACH SEASON, SO AS TO CARRY OUT BOTH THE ABOVE CHECKS AND THE CHECKS ON THE REFRIGERANT CIRCUIT. 2

17 1.7 HEATERS The unit is supplied with finned convection heaters that require periodical checking of their cleanliness and their fastening to the support. If requiring replacement, follow the instructions below, with reference to the figure: 1) -Remove the outlet grill A (version with outlet upwards) or the top access panel (outlet downwards). 2) - Remove the side panels B. 3) - Release the springs C that fasten the heaters to the supports. 4) - Remove the heaters D. B A C D B 2 1 CLIVET S.p.A. - Z. I VILLAPAIERA - FELTRE (BL) Italy - Tel Fax Web site: The data contained in this manual is not binding and may be changed by the manufacturer without prior notice. All reproduction, even partial, is prohibited. 3

18 DIRECT EXPANSION CLOSE CONTROL UNIT WITH REMOTE CONDENSER MR-DX START-UP CONTENTS: PRELIMINARY CHECKS ELECTRICAL PANEL COMPRESSORS 2.0 STARTING THE UNIT 4.0 SET POINT AND INTERFACE PRELIMINARY CHECKS - Check that the unit is positioned correctly and that the air and water connections have been performed correctly. - Check the power supply voltage and frequency: WHICH MUST BE WITHIN THE FOLLOWING VALUES 400/3/50 ± 10% The phase unbalance must be less than a maximum of 3% (see calculation example). Calculation example: L1 - L2 = 388V L2 - L3 = 379V L3 - L1 = 377V The mean of the values measured is obtained by: = The maximum deviation of the mean is obtained by: =7 V The unbalance is obtained by: 7 x 100 = 1,83% (acceptable) (accettabile) 381 IMPORTANT: The following operations must only be performed by suitably trained and authorised personnel. Before starting the following operations, ensure that the power supply is disconnected from the unit at the source and that the isolator device is padlocked and marked by a special warning sign ELECTRICAL PANEL - Check that the screws fastening the wires to the electrical components in the panel are tight (vibrations during handling and transport may have caused these to loosen). - Close the control and power circuit breakers. - Close the door on the electrical panel. - Connect the power line to the unit. - Close the main line isolator switch COMPRESSORS The scroll compressors used in these units are very noisy if rotating in the wrong direction. If this occurs, reverse two phases of the electrical power line. The power input of the compressor must be lower than the FLA value declared (seen under electrical connections ). F4D2GB-3

19 2.0 STARTING THE UNIT When the unit is powered, with the main isolating switch rotated in position I, and in standby, the line LED on the interface is on and the display shows: Clock and weekday, if the optional clock card is installed. Room temperature and corresponding unit of measure. Ambient humidity and corresponding unit of measure in % (if the optional humidifier and probe are present). The OFF status of the remote switch, if present. Thermometer, indicating that the value displayed is the temperature. 3.0 STOPPING THE UNIT To stop the unit, press the ON/OFF button; all the actuators will switch off except for the fan, which will stop after a delay of 20 seconds. The two green LEDs go off to signal that the unit is in standby. At this point, the isolating switch on the door of the panel can be turned to position SET POINT AND INTERFACE To set the set point and use the interface, refer to the section on the control of the unit. At this point, turn the remote on/off switch on (on the display, the text OFF will be replaced by ON). If the switch is not present, proceed as follows. Press the On/Off button on the interface, causing the following actions: The green on LED associated with the On/Off button will light up. The display will show the symbols corresponding to the actuators that, depending on the set point and the parameters set, should start operating. The compressor starts after a delay of 20 seconds from the start of the fan, which itself starts immediately if requested to operate. The fan, in all phases (cooling, heating, humidification and dehumidification) always starts first. The following are the symbols shown on the display when the unit is operating, indicating the operating status of the unit. SHORT DISPLAY LEGEND Fan on Cooling active, 1 and 2 refer to the cooling actuators Heating active, 1 and 2 refer to the heating actuators (optional). Humidification active (optional). Dehumidification active (optional) CLIVET S.p.A. - Z. I VILLAPAIERA - FELTRE (BL) Italy - Tel (0439) Fax (0439) sito web The information presented in this manual is not binding and may be changed by the manufacturer without notice. All rights reserved.

20 DIRECT EXPANSION CLOSE CONTROL UNIT WITH REMOTE CONDENSER MR-DX CONTROLS CONTENTS: 1.0 DISPLAY AND KEYPAD THE DISPLAY OPERATING SIGNALS THE KEYPAD MODIFYING THE PARAMETERS CONTROL PARAMETERS READ ONLY PARAMETERS DIAGRAMS ALARMS MANUAL, AUTOMATIC ALARMS AND RESET SHUT-DOWN SIGNAL OPTIONAL ALARMS DIAGNOSTICS OPTIONS 1.0 DISPLAY AND KEYPAD Table 1 Room temperature in programming mode displays the value of the parameter Temperature unit of measure: degrees Centigrade/Fahrenheit Ambient humidity in programming mode displays the no. of the parameter Relative humidity unit of measure Buzzer active Hour counter limit exceeded Off from time bands THE DISPLAY The display shows the main values monitored, and the status of the unit and the actuators. Table 1 to the side lists the symbols and the texts shown on the display, with the corresponding meanings. N.B. Fig. 1 illustrates all the symbols and texts shown on the display when the controller is started. Fig. 1 Time bands active External contact status: - ON enable unit - OFF unit in standby Indicates that the value displayed is the temperature (without this symbol on, the Set Point is displayed) Time band selected Dehumidification active Fan active :% fan speed Cooling active: - number (1 or 2) of cooling actuators; % opening of cooling valve, or (in shelter mode) % opening of freecooling damper Heating active: - number (1 or 2) of heating actuators - % opening of valve Humidification active: % steam production OPERATING SIGNALS The main states of the controller (power supply, alarm active and remote On/Off input status) are indicated by 3 LEDs on the front panel. Meaning of the LEDs: Line LED (yellow): controller powered Alarm LED (red): alarm active on the unit (the siren symbol on the display is on only when the buzzer is active) On LED (green): unit On. The effective On status of the unit may also depend on the position of the remote On-Off switch, on the active time band (function enabled only if the clock card is fitted), on the standby condition transmitted by the master unit (when a series of units are in rotation), and is indicated by the fan symbol. The ON-OFF symbols on the display indicate the status of the remote on/off switch. If the switch is not fitted, the display will always show the ON symbol. Programming phase - set password - lock parameter modification (In clock operation) weekday - display clock - setup clock C4D2GB-3

21 1.3 - THE KEYPAD ON/OFF: Switches the status of the unit; if on, pressing the button places it in Standby; vice-versa, it is reactivated. ALARM / Prg: When an alarm is present, mutes the buzzer; if the clock option is present, in programming phase sets the time. UP: In programming phase, scrolls or increases the value of the parameters. If the clock option is present, each time the button is pressed the following are displayed, in sequence: the current time, the date and the room temperature. DOWN: Held displays the set point. In programming phase, scrolls or decreases the value of the parameters. ENTER / Sel: Pressed for 5s accesses the parameters. In programming phase, changes the value of the selected parameter (see par Modifying the parameters). If the clock option is present, in programming phase sets the time. UP + DOWN pressed together for 2s reset the alarms MODIFYING THE PARAMETERS Press the ENTER button for 5s, the value of the first accessible parameter will be displayed, and in the top right, the code of the parameter, flashing. Scroll the various parameters using the UP and DOWN buttons. Pressing ENTER again displays the value, flashing, of the selected parameter, while the UP and DOWN buttons change the value. Press ENTER again to temporarily save the new value. Then, use the UP and DOWN buttons to scroll the menu of the parameters, repeating the previous operations for each parameter to be modified. Press the ALARM button, on the other hand, to store the changes made. Adjusting the contrast of the LCD The contrast of the display can be adjusted according to the effective angle of viewing. Pressing the ENTER and UP buttons together increases the value, vice-versa, ENTER and DOWN decrease it CONTROL PARAMETERS r1 Temperature set point (cooling) Used to set the temperature set point in cooling (see diagrams at the end of the paragraph). Default: 20.0 r2 Cooling differential Used to set the differential in cooling mode (see diagrams at the end of the paragraph). Range: C Default: 3.0 r3 Heating differential Used to set the differential in heating mode (see diagrams at the end of the paragraph). Range: C Default: 2.0 r4 Temperature dead zone Used to set the dead zone (see diagrams at the end of the paragraph). When the air inlet temperature is inside the dead zone, all the actuators are off, except for when the compressor is operating following a dehumidification request. Range: C Default: 1.0 WARNING: THE PARAMETERS FROM r5 TO r8 ARE PRESENT ONLY TOGETHER WITH THE HUMIDITY PROBE OPTION r5 Humidity set point Sets the humidity set point (see diagrams at the end of the paragraph). Default: 50 r6 Humidification differential Sets the differential for humidification (see diagrams at the end of the paragraph). Range: 1-20%rH Default: 4 r7 Dehumidification differential Sets the differential for dehumidification (see diagrams at the end of the paragraph). Range: 1-20%rH Default: 3 r8 Humidity control dead zone Used to set the dead zone (see the diagram at the end of the paragraph). When the humidity measured by the humidity probe is inside this zone, the humidifier and the dehumidification function are not active. Range: 1-20%rH Default: 2 r9 Temperature set point (heating) Heating set point, does not affect the operation of the machine, its setting is superfluous. Default: 18.0 rt Time band setting If the clock option is installed, used to set time band mode (see chap. 3) 0= time bands disabled 1= temperature monitoring 2= On/Off Range: 0-2 flags Default: READ ONLY PARAMETERS rp Humidity probe reading Percentage of humidity. Only with probe installed. rr Probe B4 reading Outlet air temperature. Displayed only with probe installed. c9 Hour counter, compressor 1 ca Hour counter, compressor 2 Indicates the number of operating hours for compressor 1 and/or 2. The reading of ca has no meaning, as only one compressor is used. FA Hour counter, outlet fan Indicates the number of operating hours of the fan. FC Hour counter, filter Indicates the number of operating hours of the filter. Hr Software version Displays the version of the software. 2

22 1.7 - DIAGRAMS Temperature control diagram Compressor + electric heaters The diagram to the side highlights the operation of the compressor and the heaters to bring the temperature from outside the limits r2 and r3 to limit r4. In cooling mode, the compressor starts operating at the end of r2, across the entire band, until the temperature returns inside the dead zone r4. In the heating phase, the 2 triads of heaters start respectively at half of the differential (r3/2) and at the actual limit (r3/2+r3/2). When the temperature starts returning the second triad is deactivated at half of the differential (r3/2) and the first triad is deactivated at r4. Ht and Lt are respectively the high and low temperature limits, over which the alarms Ht and Lt are activated. These alarms are reset automatically 1 degree above (Lt) and 1 degree below (Ht) the threshold. Temperature control diagram The diagram to the side is typical of machines fitted with a water heating coil. The trend highlights the operation of the water valve and the compressor to bring the temperature back from outside the differential limits r2 and r3 to the limit of the dead zone r4. The zone r3 represents the modulation band for the heating actuator, while r2 is the operating band of the compressor. The valve opens further the more the temperature moves away from the set point (r1), and reaches the maximum value outside of the differential limit r3. Compressor + 3-pos. valve Humidity control diagrams Humidification + dehumidification control The diagram highlights the operation of the compressor and the humidifier to bring the value of the humidity, when outside of the limits of the differential r6 and r7, back into the dead zone r8. In the dehumidification phase, the compressor operates even if the temperature is below the set point r1, while in humidification phase the humidifier operates along a ramp (0-10Vdc), proportionally to the humidity request. In dehumidification mode, exceeding the LOW LIMIT, equal to 3/2*r3 (see the temperature control diagram above) causes the compressor to stop, ignoring the dehumidification request, while the heating actuators (hot water coil, heaters or hot gas coil), which are activated as soon as the temperature falls below the set point, continue to operate according to the type of control set, until the temperature reaches the SET POINT, above which the compressor starts operating again so as to dehumidify. Exceeding the high (HH) and low (LH) humidity limits produces the corresponding alarms, with reset automatic and an hysteresis of 1% RH. 3

23 Temperature control diagram Dehumidification only -{}- The post-heating hot gas coil, unlike the other heating actuators, starts when the temperature is below the set point and the machine is operating in dehumidification mode. The two conditions, temperature and humidity, are controlled at the same time. The coil is activated over the lower limit of r3, and operates across the entire band until the lower limit of r4. Compressor + post-heating coil ALARMS MANUAL, AUTOMATIC ALARMS AND RESET When an alarm occurs, the unit performs the following actions: activation of the buzzer and display of a signal (with unit On); energising of the alarm relay. display of the alarm code and red LED on. In this condition, pressing the ALARM button mutes the buzzer. When the alarms with automatic reset are no longer present, if no alarms with manual reset are active, the following occurs: buzzer off; deactivation of the alarm relay; red alarm LED switches off; reactivation of the actuators stopped due to the alarm. Pressing the UP and DOWN buttons together, for 2s, cancels the display of the alarm code. In the event of alarms with manual reset, pressing the UP and DOWN buttons together, for 2s, performs the following actions: deactivation of the alarm relay; red alarm LED switches off; reactivation of the actuators stopped due to the alarm. The alarm messages are displayed cyclically in the progressive order indicated in Table 2. At the end of the cycle the percentage of humidity is displayed (if featured) for 6 s SHUT-DOWN SIGNAL A relay that is de-energised when an alarm occurs is used for the alarm signal. The relay features a 24V, 1A changeover contact, available via the user terminal block. Terminal C6: power supply common. Terminal NC6: NC contact for the remote alarm signal. Terminal NO6: NO contact for the remote no alarm signal OPTIONAL ALARMS Flooding, fire or smoke sensor. Optional devices are available to signal flooding or the presence of fire or smoke. The alarm signal, which is also active in standby, stops the unit, and it can only be reset manually once the alarm conditions are no longer present. Phase monitor. This measures the exact connection sequence of the phases, activating an alarm if the machine is not powered as shown on the wiring diagram. The alarm is manually reset. Differential pressure switch for dirty filters When the air filter is dirty or clogged and the flow-rate of the air intake falls below 40-50%, the filter differential pressure switch is activated. A signal-only alarm is activated, which is reset automatically when the causes are no longer present. 4

24 2.4 - DIAGNOSTICS Table 2 n. Code Description Delay Reset C1 R1 R2 Sys Fan Hum. Deh. Alarm relay 1 E1 Intake temperature probe 1 min. Autom. off off off off off on 2 E3 Humidity probe 1 min. Autom. off off on 3 E4 Outlet temperature probe 1 min. Autom. on 4 Er:E EEPROM boot immed. Autom. off off off off off off off on 5 EE EEPROM run immed. Autom. on 6 EL Insufficient power immed. Autom. on 7 H1 High pressure in circuit immed. Man. off on 8 L1 Low pressure in circuit 2 min. Man. off on 9 F1 Filter dirty immed. Autom. on 10 FL Flow 30-5 Man. off off off off off off off on 11 r1 Heaters and/or heater thermal immed. Man. off off on overload 12 At Outlet temperature 2 min. Autom. off on 13 AH Humidifier and/or humidifier 30 s Autom. off on thermal overload 14 Lt Low temperature 20 sec. Autom. on 15 Ht High temperature 20 sec. Autom. on. on 16 LH Low humidity 20 sec. Autom. on 17 HH High humidity 20 sec. Autom. on 18 tc Compressor and/or condenser immed. Autom. off on thermal overload 19 tf Fan thermal overload immed. Autom. off off off off off off off on 20 AL Optional alarms immed. Man. off off off off off off off on 21 PA No power 2 s Autom. off off on 22 CL Clock immed. Man. on Note: C1: compressor Fan: fan R1 R2: heaters Hum.: humidifier Sys: control interface Deh: dehumidification (compressor) For each alarm, the table shows the code displayed, the alarm activation delay, the type of reset - manual or automatic, the actuators that are stopped and the status of the alarm relay OPTIONS Electric heaters. The machine can be fitted with two triads of electric heating elements, which start, in steps or in binary mode, when the temperature falls below the set point. The table below shows the power available according to the size of machine. MR-DX kw 6 kw 9 kw 12 kw 18 kw Table 3 Hot gas - post-heating solenoid valve When the temperature falls below the set point and the machine is operating in dehumidification mode, a valve is activated that controls the inlet of hot gas into a heating coil. Water heating coil. When the temperature falls below the set point, a threeposition servo control manages the opening and the closing of the valve that supplies a water heating coil. Gas shut-off valve Automatic liquid shut-off valve located upstream of the expansion coil. Humidity probe. Measures the percentage of relative humidity in the air. This probe is required for performing the humidification and dehumidification functions. Humidifier The unit can be fitted with an immersed electrode humidifier that enters into operation when the relative humidity of the ambient air falls below the set point; the humidity is controlled in proportion to the request. The table below shows the values available according to the size of machine. MR-DX kg/h 4 kg/h Table 4 Dehumidification When the humidity rises above the set point, the compressor, irrespective of the temperature set point, starts operating so as to bring the humidity back to within the set value. If during such operation the temperature also falls, the heating actuators are started so as to bring it back within the set point. 5

25 Remote on/off control By removing the jumper between terminals G and ID1, an on/off switch can be connected that allows the machine to be remote controlled. Opening the circuit using the switch puts the machine in stand-by, and vice-versa. Condensate recovery pump A pump can be installed to recover the condensate from the pan or on the bottom of the unit. Damper When the unit has the outlet downwards, and is ducted in series with other units, a damper controlled by an actuator with spring return will close the outlet if the unit is not operating. This prevents the outlet air from other units from flowing in through the outlet of the unit that is off or in standby. Auxiliary terminal This is a 230Vac 2A power supply available at terminals 5 and 6 on the user terminal block. This power supply is available only when the fan is active. Clock, time bands and alarm log - Clock Time display Pressing the UP button displays the current time and date. Pressing it once displays the time and the weekday (1= Monday, 2= Tuesday,..., 7= Sunday); pressing again shows the date in the format day-month-year. Hour setting First press (and hold) the UP button, then the Prg button, and hold both for 5s. The indication of the minutes starts flashing; use the UP and DOWN buttons to set the required value. The Sel button, on the other hand, selects, in sequence, the other fields: hours weekday - year - month - day of the month. At the end, pressing the Prg button confirms the modifications made. - Time bands After having accessed the parameter rt (see modifying the parameters in chapter 1, paragraph 1.4), rt can be set to 1 or 2, thus enabling the time bands. Pressing the Sel button displays, in sequence, indicated by a segment, the time bands 1, 2, 3, 4 for day 1 (Monday),.., the time bands 1, 2, 3, 4 for day 7 (Sunday). The UP and DOWN buttons are used to modify, with 10 minute steps, the start time for the selected band, while the On/Off button enables or disables the action of the band, as confirmed by the message ON/OFF on the display. Copying the time bands If the times set for the bands are also valid for the following days, they can be copied by holding the Sel button for 3s. Once having copied them, the following day is displayed automatically: to copy the bands again, release the Sel button and then press it again for 3s. The operating status controlled by the time bands is indicated by the time bands active symbol on the display. N.B. The On from time bands status is enabled only if the unit is activated from the keypad and from the remote input (if enabled). The Off from time bands status, displayed by the half moon symbol on the display, acts differently according to whether parameter rt is equal to 1 or 2: rt= 1, Sleep mode: during the Off status, the fan, if controlled in proportional mode, operates at the minimum speed and the actuators remain off. The unit is started again in the following conditions: a) the temperature exceeds 70% of the high/low alarm thresholds, returning to Sleep when the temperature falls back inside 40% of the alarm delta. b) the On/Off button is pressed: in this case, the On status lasts until the following time band is reached; during this period the symbol A flashes. rt= 2: the unit is in standby, as if the On/Off button had been pressed. In this case too pressing the On/Off button starts the unit until the following time band switches it Off. Alarm log When an alarm occurs, the following are saved automatically: the alarm code, the hour, the minute and the date at which it occurred, with a maximum of 300 signals saved. When the maximum dimension is reached, the older events are deleted (code 1 always indicates the most recent alarm). Displaying the alarm log To display the list of the alarms saved, press the UP button, followed by the alarm button. The code of the most recent alarm is displayed and, by pressing Sel, the hour, minute and date. Up and Down can be used to scroll the alarms. Displaying a position in which no alarm is saved, the code is replaced by dashes. The display shows an incremental index in the field on the right, which identifies the current position; the hundreds are displayed in the field on the left (e.g.: 1 res 55 indicates that the unit was reset and the current position is 155). Exiting the alarm log To exit the alarm log menu, press the Alarm button. Alternatively, the log is exited by timeout after 60 seconds. RS485 serial card To use the interface in an RS485 supervisor or telemaintenance network, the optional RS 485 card needs to be fitted. As default, the address of the device in the network is 1, while the line speed set is baud. Specifications: RS485 serial card, asynchronous, opticallyisolated, speed baud, maximum number of devices 200, maximum distance from the supervisor 1 km. (For further information see the section on electrical connections ). Connecting a series of units This configuration allows the timed rotation of a unit defined as standby in a group with a maximum of 6 units. If an alarm is activated on one of the units in operation, the unit in standby is started. This option is not available at the same time as the flooding, fire and smoke alarm option, nor on units with hot gas post-heating coils. (For further information, see the section on electrical connections ). CLIVET S.p.A. - Z. I VILLAPAIERA - FELTRE (BL) Italy - Tel Fax sito web: The information presented in this manual is not binding and may be changed by the manufacturer without notice. All rights reserved.

26 DIRECT EXPANSION CLOSE CONTROL UNIT WITH REMOTE CONDENSER MR-DX AIR FILTERS IMPORTANT BEFORE STARTING TO CLEAN THE AIR FILTERS CHECK THAT THE UNIT POWER SUPPLY IS DISCONNECTED 1 2 Controlling the condition of the filters is a routine maintenance, its frequency depends on the environment in which the unit is installed. In particularly dusty environments we recommend this operation be done on a weekly basis. For added reliability, it would be advisable to install a differential pressure switch as an optional dirty filter signal. N4D2GB-3

27 FOR THEIR REMOVAL AND WASHING, FOLLOW THE INSTRUCTIONS BELOW: WARNING: Accidentally touching the exchanger fins could give minor cuts to your hands. This operation should be carried out using gloves. - Remove the front panel, using the special tool supplied. - Remove the air filters, first lifting them upwards to release them from the guides, and then pull them out from the front. This operation must be performed with care, so as to not damage the humidity and temperature probes fitted in front of the filters, as well as to avoid spreading dust on the areas under the filters. - The filter element is made of polyester coated with synthetic resins and may be easily washed in warm water with common detergents. - Rinse well under running water. - Carefully dry the filter and slide it fully into the special guide at the top, so that, by lowering it, it fits into the guide at the bottom. IMPORTANT: the filter must be installed in a certain direction compared to the air flow, identified by a black arrow on the filtering element, which must face the coil. The direction of installation of the EU5 (F5) filters is identified by a sticker with an arrow attached to the metal frame. - Replace the grille or front panel and restart the unit. CLIVET S.p.A. - Z. I VILLAPAIERA - FELTRE (BL) Italy - Tel Fax sito web: The information presented in this manual is not binding and may be changed by the manufacturer without notice. All rights reserved.

28 DIRECT EXPANSION CLOSE CONTROL UNIT WITH REMOTE CONDENSER MR-DX ELECTRICAL CONNECTION ELECTRICAL PANEL MAINS POWER CONNECTION CONNECTIONS PERFORMED BY THE CUSTOMER 4.0 CONNECTING A SERIES OF UNITS (OPTIONAL) SERIAL CONNECTION (OPTIONAL) CONTENTS: IMPORTANT BEFORE PERFORMING ANY OPERATIONS ON THE ELECTRICAL SYSTEM, MAKE SURE THAT THE POWER SUPPLY TO THE UNIT IS DISCONNECTED UPSTREAM. N.B. REFER TO THE WIRING DIAGRAM ENCLOSED WITH THE UNIT, WHICH IS AN INTEGRAL PART OF THIS MANUAL ELECTRICAL PANEL The electrical panel is located in the upper part at the front of the unit. To access the panel, use the triangular tool supplied to open the two locks that secure the front panel, then lift the panel upwards, loosen the 2 screws that secure the hinged door ¼ of a turn (these are accessible only after having removed the panel) and finally place the door-lock isolator switch in the zero position, so as to disconnect power from the machine MAINS POWER CONNECTION The mains isolator switch QS1 is installed in the lower left of the electrical panel. The power supply cables must be connected to the input of this switch. Also connect the earth wire to the corresponding yellow-green terminal to the side of the isolator switch. IMPORTANT: The power cables must be of a suitable type and cross-section, and sized according to the standards in force, considering the power consumed by the unit. For this purpose, refer to the rating plate located inside the electrical panel. The ELECTRICAL DATA table below refers to the standard unit and does not consider any optional applications, such as electric post-heating coils or electric steam humidifiers. For the correct sizing of the power supply line, refer exclusively to the FLI and FLA data on the machine s rating plate, the only source of data that details any options included in the specific unit. E4D2GB-3

29 ELECTRICAL DATA MR-DX SIZE Total (A) 6,82 8,83 9,67 13,42 17,33 20,15 26,1 Compressor C1 (A) F.L.A. (1) 3 Outlet fans (A) 230/1/50 (N. 1 DDM 9/9) Compressor C1 (A) 400/3/50 L.R.A. (2) Outlet fans (A) 230/1/50 3,7 (N. 1 DDM 9/9) F.L.I. (3) Outlet fans (kw) 230/1/50 0,35 (N. 1 DDM 9/9) 400/3/50 3,82 5,83 6,67 7,72 11,33 14,15 14,65 3 (N. 1 DDM 9/9) 3 (N. 1 DDM 9/9) 5,7 (N. 1 DDM 10/10) 6 (N. 2 DDM 9/9) 6 (N. 2 DDM 9/9) 11,4 (N. 2 DDM 10/10) ,7 (N. 1 DDM 9/9) 3,7 (N. 1 DDM 9/9) 7,6 (N. 1 DDM 10/10) 7,4 (N. 2 DDM 9/9) 7,4 (N. 2 DDM 9/9) Total (kw) 2,57 3,73 4,29 5,25 7,28 8,62 9,5 Compressor C1 2,22 3,38 3,94 4,7 6,58 7,92 8,4 (kw) 400/3/50 0,7 0,35 0,35 0,55 0,7 (N. 2 (N. 1 DDM (N. 1 DDM (N. 1 DDM (N. 2 DDM DDM 9/9) 9/9) 10/10) 9/9) 9/9) 15,2 1,1 (N. 2 DDM 10/10) M.I.C. (4) , ) F.L.A. Full Load Amperes (at maximum rated operating conditions) 2) L.R.A. Locked rotor amperes. 3) F.L.I. Full load input (at maximum rate operating conditions). 4) M.I.C. Maximum inrush of current. This value is not the arithmetic sum of the individual peak current values, but rather considers the non-simultaneous starts between the compressors and the fans CONNECTIONS PERFORMED BY THE CUSTOMER As well as the power supply connection, the customer is also responsible for the following optional connections to be performed. For terminals refer to the unit wiring diagram. Remote ON OFF (to perform the connection, remove the jumper from terminals) Remote condenser control and relative thermal cut-off device. Exchanger free contact to use for the block optic signalling Terminals 5, 6 : used to take a voltage of 230 Vac 2A, available only when the evaporating fans are operating. Optional connection to the supervisory or teleassistance network Anti-smoke detector and fire alarm contacts 2

30 Figure 1 connections provided by the costumer 3

31 Figure 2 connection to the remote condenser 4

32 4.0 - CONNECTING A SERIES OF UNITS (OPTIONAL) This configuration allows the timed rotation of a unit defined as standby in a group with a maximum of 6 units. If an alarm is activated on one of the units in operation, the unit in standby is started. This function is performed using a digital input and output that from the master (unit 1) sends the command to activate and deactivate the unit in standby (the command is updated every 10 minutes). The diagram shows how all the panels may be the same, and only during installation does the connection need to be performed, as shown in Figure 3, with a three-wire cable between one panel and the next. During installation, attention must be paid to the following three points: 1. only one unit must be set as the master; 2. it is recommended to terminate the line with a 220Ω 5W or 470Ω 4W resistor (Rt) (Carel code AXX); 3. check that the G0 of the transformers are not earthed, so as to avoid unwanted current at G0. Figure 3 connection of a series of units Only one unit can be in stand-by, while the others are in operation. When the time t has elapsed (0-250 hours) the unit in reserve is rotated, according to the progressive order of addresses. If one of the units in operation stops due to an alarm, the machine in stand-by is automatically restarted. The alarm condition is detected after a delay of 30s. If two units have the same address, they will be placed in stand-by at the same time. The unit with address 1 is the master, and this uses impulses from the digital output Out7 to send the ON => STAND-BY command, and vice-versa, to the other units. The command is resent every 10 minutes for safety reasons. 5

33 5.0 - SERIAL CONNECTION (OPTIONAL) To use the interface in an RS485 supervisor or telemaintenance network, the optional RS 485 card must be purchased and the procedure below completed: - switch off the interface. - on the user terminal block X2, connect the serial line, respecting the polarity indicated and connecting the shield to the GND terminal. - switch the interface on. N.B. The serial line should be terminated with a 120ohm - 1/4W resistor, placed between terminals Tx+ and Tx- on the terminal block X2 at the opposite end of the network from the supervisor (Fig. 5). The communication standard used by the electronics is the Carel protocol, while the international BACnet TM and Modbus TM standards can be used with the kits below. PE4H0004: 485/232 serial converter for Carel protocol PE4H0002: Carel/BACnet TM protocol conversion gateway PE4H0003: Carel/Modbus TM protocol conversion gateway The latter two do not require the serial converter. Technical specifications of the RS485 serial card Power supply voltage: from the interface by plug-in connector Current input: 20mA Storage conditions: C, rh < 80% non-condensing Operating conditions: 0-65 C, rh < 80% non-condensing Card dimensions: 46x44 mm Index of protection: IP00 Environmental pollution: normal Temperature limits of the surfaces: as operating temp. Classification according to protection against electric shock: to be integrated in Class I or II devices Category of resistance to heat and fire: D PTI of the insulating materials: 250V Serial output: three-way screw terminal connector for wires with a min. cross-section of 0.2mm 2 and max. cross-section of 1.5mm 2 Standard: RS485 asynchronous, optically-isolated Maximum speed: baud Maximum number of devices: 200 Maximum distance from the supervisor: 1 km Cable to be used: 1 twisted pair plus shield, AWG20/22, with capacitance between the wires < 90pF/m (example BELDEN cable ) Fig. 5 CLIVET S.p.A. - Z. I VILLAPAIERA - FELTRE (BL) Italy - Tel Fax sito web: The information presented in this manual is not binding and may be changed by the manufacturer without notice. All rights reserved. 6

34 DIRECT EXPANSION CLOSE CONTROL UNIT WITH REMOTE CONDENSER MR-DX REFRIGERANT PIPES CONTENTS: REFRIGERANT PIPES DISCHARGE PIPE LIQUID PIPE CONNECTION TO THE REMOTE CONDENSERS POSITIONING CLEARANCE CR CONDENSERS WITH VERTICAL AIRFLOW 2.4 CR CONDENSERS WITH HORIZONTAL AIRFLOW 2.5 CONNECTION DIAGRAM REFRIGERANT PIPES The size of the refrigerant lines for the connections between outdoor condensing units and indoor evaporator units is of fundamental importance. The sizes of the refrigerant pipes on the standard units are shown in Table 1. Size Intake Compression Liquid Condens. drain Humidifier fill Humidifier drain Hot water inlet Hot water outlet ½ ½ ½ ½ Table 1 For the connections to the condensing unit, see the tables below to define the most suitable diameter for the installation. The sizes provided are indicative: for a more correct calculation, refer to the corresponding bulletin (SIZING REFRIGERANT LINES IN SYSTEMS WITH TWO SECTIONS, code D76AC/01-94). Table 2 shows the pressure drop of the components that are most commonly used in the installation, expressed in metres of equivalent length of straight pipe with the corresponding diameter. Adding these equivalent lengths of the components used in the system to the effective length of the straight sections of pipes gives a hypothetical straight length, from which the pressure drop of the line can be calculated. Tables 3 and 4 show the diameters of the discharge and liquid pipes, recommended for the various equivalent lengths. EQUIVALENT RESISTANCE IN LENGTH OF STRAIGHT PIPE FOR THE REFRIGERANT CONNECTIONS DESCRIPTION SIZE OF THE PIPE IN MM Standard 90 bend Wide radius 90 bend elbow Gate valve cock Check valve Table 2 Note: if fitting solenoid valves in the liquid line (outside of the unit), the pressure drop of the valve used and the corresponding equivalent resistance of straight pipe corresponding to the capacity involved should be considered. P4D2GB-3

35 1.1 - DISCHARGE PIPE LIQUID PIPE RECOMMENDED PIPE SIZE IN MM (R407C/R22) MODEL EQUIVALENT PIPE LENGTH 8 meters 15 meters 23 meters 30 meters MR DX MR DX MR DX MR DX MR DX MR DX MR DX Table 3 RECOMMENDED PIPE SIZE IN MM (R407C/R22) MODEL EQUIVALENT PIPE LENGTH 8 meters 15 meters 23 meters 30 meters MR DX MR DX MR DX MR DX MR DX MR DX MR DX Table 4 Note: for distances over 23 metres, the quantity of oil in circulation is significant and may require topping up. SPECIAL CONSIDERATIONS: - All the pipes must be perfectly clean (clean using nitrogen or dry air before connecting the pipes to the two units) and free of moisture for optimal emptying. - When installing the refrigerant connections below the raised floor or above the ceiling, check that these do not obstruct the flow of air to the unit, causing drops in the flow-rate and an increase in noise. The pipes should run in pairs and in the direction of the air flow. - Use always the gland around the pipes passing through the holes on the unit, and suitable gaskets when passing through walls. - When using R-407C gas, do not leave the compressor or the dewatering filters open in the atmosphere for more than 10 minutes. - When brazing, inert gas should be introduced into the line to prevent oxidation inside the pipe (nitrogen is recommended). - The liquid and discharge lines should be thermally insulated so as to avoid exchanges of heat that may affect correct operation. The discharge line must be insulated correctly in the event of possible contact with people, so as to avoid accidental burns. - In the vertical discharge sections, an oil collection trap should be fitted each 6 metres, to allow the entrainment of the oil in the line. - When the condenser is situated above the compressor, the compressor discharge line must feature a drain trap that reaches the level of the floor (Figure 2). The aim is to reduce the risk of condensed liquid refrigerant returning down the line into the compressor, when this is not operating. - In the vertical discharge sections, an oil collection trap should be fitted each 6 metres, to allow the entrainment of the oil in the line, above the bowl on the base (Figure 2). 2

36 - In the horizontal sections, create an incline towards the flow of the gas, to assist the flow of the oil (incline of 0.5%). - When installing the liquid and discharge lines together, these should be separated by at least 50 mm. In horizontal sections, the discharge line must be above the liquid line. - Use curves with a wide radius (not elbows) and carefully avoid choking the pipes. - After having installed the lines, the system must be tested for leaks: the test should be carried out at a pressure of 13 Bars; do not exceed 20 Bars to avoid damaging the thermostat. Carefully check all the pipes using a leak detector or other electronic instrument, with special attention to the welds and joints in general. Non-return valve CR MR Liquid Suction Antivibration Fixed point Solenoid valve Figure 1 CR MR Figure 2 3

37 2.0 - CONNECTION TO THE REMOTE CONDENSERS POSITIONING When using a forklift, check that the forks protrude from the opposite side of the remote condenser and do not damage the unit, as this may not be protected (see Figure 2.11). If necessary, lift the unit with a crane, use a suitable lifting bar hooked to the fittings, as shown in Figure M12 Figure 2.11 Figure 2.12 Check that the area where the condensers are positioned is level and that the weight of the unit is adequately supported CLEARANCE An adequate circulation of air at the inlet and outlet from the remote condensers is of primary importance for correct operation, and consequently these should not be installed close to other units. The clearances are shown in Figure (MIN) FRONT CLEARANCE (TYP) 3000(MIN) TOP CLEARANCE (TYP) 250(MIN) SIDE/REAR CLEARANCE (TYP) VERTICAL AIRFLOW UNITS CONTROL PANEL CLEARANCE 760 (MIN) TOP CLEARANCE 30(TYP) 760 (MIN) 250 (MIN) 300 (MIN) REAR CLEARANCE 3000 (MIN) FRONT CLEARANCE HORIZONTAL AIRFLOW UNITS Figure

38 2.3 - CR CONDENSERS WITH VERTICAL AIRFLOW Key: 1. -control panel 2. -fan speed controller 3. -isolating switch 4. -condenser coil and subcooling circuit 5. -hot gas inlet 6. -liquid outlet 7. -inlet and outlet of the subcooling circuit 8. -fan protection grill (FE mm in diameter) 9. -supports (delivered separately) 10. -position for lifting hooks ( 2xM12) 11. -electrical cable inlet CR CONDENSERS WITH HORIZONTAL POSITION OF THE COIL 500mm DIAMETER MODEL No. of fans x no. of poles MOD EL Rows DIM A DIM B Discharge Liquid Subcooling Weight (kg) CRB-9EC 1 x 8P 3R CRM-12EC 1 x 6P 3R CRA-15EC 1 x 4P 3R CRB-20EC 2 x 8 P 3R CRM-24EC 2 x 6P 3R CRB-23EC 2 x 8P 4R CRM-29EC 2 x 6P 4R CRA-31EC 2 x 4P 3R CRA-36EC 2 x 4P 4R CRB-34EC 3 x 8P 4R CRM-42EC 3 x 6P 4R CRA-54EC 3 x 4P 4R MOD 1 MOD 2 MOD 3 5

39 2.4 CR CONDENSERS WITH HORIZONTAL AIRFLOW Key: 1 -control panel 2 -fan speed controller 3 -isolating switch 4 -condenser coil and subcooling circuit 5 -hot gas inlet 6 -liquid outlet 7 -inlet and outlet of the subcooling circuit 8 -fan protection grill (FE mm in diameter) 9 -supports (delivered separately) 10 -position for lifting hooks ( 2xM12) 11 -electrical cable inlet CR CONDENSERS WITH VERTICAL POSITION OF THE COIL 500mm DIAMETER MODEL No. of fans x no. of poles MOD EL Rows DIM A DIM B Discharge Liquid Subcooling Weight (kg) CRB-9EC 1 x 8P 3R CRM-12EC 1 x 6P 3R CRA-15EC 1 x 4P 3R CRB-20EC 2 x 8 P 3R CRM-24EC 2 x 6P 3R CRB-23EC 2 x 8P 4R CRM-29EC 2 x 6P 4R CRA-31EC 2 x 4P 3R CRA-36EC 2 x 4P 4R CRB-34EC 3 x 8P 4R / CRM-42EC 3 x 6P 4R / CRA-54EC 3 x 4P 4R / MOD 1 MOD 2 MOD 3 6

40 2.5 CONNECTION DIAGRAM The diagram refers to an indoor evaporating unit connected to an outdoor remote condenser with subcooling circuit and receiver kit for low temperatures C Key: 1 - compressor 2 carter heater 3 high pressure flow switch 4 - on-off valve 5 remote condenser 6 - non-return valve* 7 - liquid receiver 8 safety valve 9 - self-adjusting heating element * 10 - dewatering filter 11 - liquid light 12 - thermostat 13 - evaporator 14 low pressure flow switch * Supplied with the receiver kit for low temperatures CLIVET S.p.A. - Z. I VILLAPAIERA - FELTRE (BL) Italy - Tel Fax Web site: The information presented in this manual is not binding and may be changed by the manufacturer without notice. All rights reserved.

41 DIRECT EXPANSION CLOSE CONTROL UNIT WITH REMOTE CONDENSER MR-DX DEFINITION OF DANGEROUS AREA GENERAL RISKS COOLANT SAFETY DIAGRAMS RESIDUAL RISKS CONTENTS: WARNING THIS SPECIFIC SECTION OF THE MANUAL POINTS OUT EACH OPERATION WHICH BRINGS WITH IT A POSSIBLE RISKY SITUATION AS WELL AS ALL THE PARTICULAR PRECAUTIONS TO OBSERVE DEFINITION OF DANGEROUS AREA - The external dangerous zone is a precise area all around the unit and its vertical projection on the ground in the case of hanging unit, in that case due to the particular unit displacement, the external dangerous zone can be considered inexistent if in the installation are used the methods reported in the attached manual. - The internal dangerous zone is the area which one can enter only with previous and intentional removal of the protecting panels. Figure 1 Dangerous zone K4D2GB-3