MHW Air Handling Unit (50/60Hz)

Transcription

1 Technical Manual MHW Air Handling Unit (50/60Hz) MHW015A MHW025A MHW035A MHW050A MHW020A MHW030A MHW040A Engineered for flexibility and performance. TM MHW (50Hz/60Hz)

2 Contents Literature No.: TM-MHW-1101A Supersedes: TM-MHW-1001A Part No.: M Nomenclature...2 Features...2 Electric Heater Power...3 Specifications...4 Components data...5 Sound data...6 Performance correction coefficient...7 Outline and dimensions...8 Electrical data...10 Wiring diagrams...11 Installation...13 Service and maintenance...15 Trouble shooting...16 Exploded view and part list...17 Note: Installation and maintenance are to be performed only by qualified personnel who are familiar with local codes and regulations, and experienced with this type of equipment. Caution: Sharp edges and coil surfaces are a potential injury hazard. Avoid contact with them. Warning: Moving machinery and electrical power hazard. May cause severe personal injury or death. Disconnect and lock off power before servicing equipment. McQuay is a registered trademark of McQuay International. All rights reserved throughout the world McQuay International Bulletin illustrations cover the general appearance of McQuay International products at the time of publication and we reserve the right to make changes in design and construction at any time without notice. 1

3 Nomenclature MHW 030 A- 4 L -A AA E Features E:export U:"Made in China" label Design series A: V/1Ph/50Hz K: V/1Ph/60Hz L-Left hand (Facing discharge) R-Right hand (Facing discharge) 4-4 coil rows; 6-6 coil rows A-Design Serial No. 030-Nominal airflow is 3000 m3/h MHW-McQuay super thin horizontal air handling unit General Information McQuay for years has been committed to provide high quality air handling systems of various models and types, and has made remarkable achievements in the industry. As a new generation of products, the MHW series slim ceiling air handling units are launched by McQuay to adapt to the increasingly cramped building layout. In addition to the outstanding performance of previous McQuay air handing units, the MHW series slim ceiling air handling units feature a slim size, only 420mm in height. The airflow is adjustable within the range of three levels to meet different air flow needs. Powered by a 50 or 60Hz single-phase power supply, this series eliminates the need for users to expand the power capacity. The MHW series can be mounted in a wide variety of places, especially those with limited space and high noise. Featuring easy installation and flexible use, the MHW series helps minimize the indoor space and maximize customers benefits. Structure The high-strength galvanized steel sheets, coated with electrostatic spraying, are highly corrosion-proof. Made of a new type of PE material, the heat insulator features ideal thermal insulation, sound absorption, and no moisture permeability. The insulator is also proof against cold bridge. Fans With efficient tilted multi-blade centrifugal fans, this unit provides low noise but high reliability. The fan and the motor are coupled directly. The high-precision and quality ball bearing eliminate the need for lubricating. Multi-level Speed Control Driven by a single-phase capacitor-running asynchronous motor, the unit can be adjusted at three levels to provide different amounts of air flow. Filters The air inlet is equipped with primary nylon filters. Heat Exchanger Made on the OAK manufacturing facility the heat exchanger uses thin-walled copper tubes mechanically expanded into new-type fins, to ensure close contact between the cooper tubes and fins. This enables the coils to provide best heat exchange and the units to run reliably and efficiently. Performance MHW series products feature high external total pressure (ETP) and large cooling capacity. Slim in size and simple in structure, this series makes it easy for installation and maintenance. 2

4 Electric Heater Power Electric Box Model Power Supply Capacity(kW) MHW-EH-020BOX V/1Ph/50Hz; V/1Ph/60Hz 2 MHW-EH-030BOX V/1Ph/50Hz; V/1Ph/60Hz 3 MHW-EH-040BOX V/1Ph/50Hz; V/1Ph/60Hz 4 MHW-EH-050BOX V/1Ph/50Hz; V/1Ph/60Hz 5 MHW-EH-060BOX V/1Ph/50Hz; V/1Ph/60Hz 6 MHW-EH-075BOX V/1Ph/50Hz; V/1Ph/60Hz 7.5 NOTES: EACH HEATER BOX CAN ONLY BE USED FOR ONE AIR DISCHARGE DUCT. 1) MHW015/20/025 - ONLY ONE HEATER BOX IS REQUIRED. 2) MHW030/035/040/050 - NEED TO SELECT TWO BOX. 3

5 Specifications General data MODEL MHW015A MHW020A MHW025A MHW030A MHW035A MHW040A MHW050A NOMINAL AIR FLOW m 3 /h EXTERNAL TOTAL PRESSURE Pa POWER SOURCE V/Ph/Hz V/1Ph/50Hz /1/60 N O M I N A L CAPACITY WATER FLOW WATER PRESSURE DROP UNIT DIMENSION COOLING HEATING COOLING HEATING COOLING HEATING PACKING DIMENSION WEIGHT 4 ROWS(RETURN AIR) ROWS(FRESH AIR) ROWS(RETURN AIR) ROWS(FRESH AIR) kw 4 ROWS(RETURN AIR) ROWS(FRESH AIR) ROWS(RETURN AIR) ROWS(FRESH AIR) ROWS(RETURN AIR) ROWS(FRESH AIR) ROWS(RETURN AIR) ROWS(FRESH AIR) m 3 /h 4 ROWS(RETURN AIR) ROWS(FRESH AIR) ROWS(RETURN AIR) ROWS(FRESH AIR) ROWS(RETURN AIR) ROWS(FRESH AIR) ROWS(RETURN AIR) ROWS(FRESH AIR) kpa 4 ROWS(RETURN AIR) ROWS(FRESH AIR) ROWS(RETURN AIR) ROWS(FRESH AIR) LENGTH WIDTH HEIGHT mm LENGTH WIDTH HEIGHT ROWS kg 6 ROWS NOTES: 1) ALL SPECIFICATIONS ARE SUBJECTED TO CHANGE BY THE MANUFACTURER WITHOUT PRIOR NOTICE. 2) THE ABOVE PARAMETERS ARE FOR STANDARD PRODUCTS ONLY. 3) STANDARD AIR RETURN COOLING CONDITIONS: 27 DB/19.5 WB; STANDARD FRESH AIR COOLING CONDITIONS: 34 DB/28 WB; STANDARD COOLING WATER ENTERING/LEAVING CONDITIONS: 7 /12 STANDARD AIR RETURN HEATING CONDITION: 21 DB; STANDARD FRESH AIR HEATING CONDITION: 0 DB; STANDARD HEATING WATER ENTERING/LEAVING CONDITIONS: 60 /50 4) THE PARAMETERS IN THE ABOVE TABLE ARE MEASURED AT THE ALTITUDE OF 0M ABOVE SEA LEVEL, AND MAY VARY WITH THE ALTITUDE. 4

6 Components data MODEL MHW015A MHW020A MHW025A MHW030A MHW035A MHW040A MHW050A STRUCTURE TYPE TYPE Galvanized steel coated with elextrostatic spraying, internal glued with insulator PE Corrugated aluminum fin mechanically bonded with copper tube TUBE DIAMETER(mm) 9.53 COIL FPI 12 WORK PRESSURE(MPa) 1.6 INLET/OUTLET PIPE CONDENSING WATER PIPE TYPE/MATERIAL R1½ R1 Centrifugal forward curved blower and galvanized steel FAN FAN NO. 1 2 DRIVE TYPE Direct drive AIR DISCHARGE TYPE Lower horizontal air discharge Single phase capacitor running MOTOR QUANTITY 1 2 INDEX OF PROTECTION(IP) IP20 INSULATION CLASS TYPE/MATERIAL B Primary nylon FILTER SIZE THICKNESS 21 HEIGHT mm 345 LENGTH Type/Material Cold-rolled steel plate Drain Pan Thickness(mm) 1.0 Insulation 5mm PE NOTES: ALL SPECIFICATIONS ARE SUBJECTED TO CHANGE BY THE MANUFACTURER WITHOUT PRIOR NOTICE.

7 Sound data Unit ESP Speed 1/1 Octave Sound pressure level (db(a), ref 20μPa) k 2k 4k 8k Overall db(a) MHW015A MHW020A MHW025A MHW030A MHW035A MHW040A MHW050A 70Pa 100Pa 100Pa 120Pa 120Pa 150Pa 150Pa High Medium Low High Medium Low High Medium Low High Medium Low High Medium Low High Medium Low High Medium Low NOTE: SOUND PRESSURE LEVELS ARE TESTED IN BAFFLE CHAMBER, WITH BACKGROUND NOISE LEVEL: 11.5 db(a), MICROPHONE POSITION IS 1 METER IN FRONT AND 1 METER BELOW THE UNIT. 6

8 Performance correction coefficient Cooling capacity performance curve The above curve shows the cooling capacity variations at different entering water temperatures. Standard return air: 27ºC DB/19.5ºC WB; Temperature difference between entering and leaving water: 5ºC The cooling capacity correction factors are based on the cooling capacity (using 1 as the coefficient) in standard cooling water entering/ leaving conditions (7ºC for entering water/12ºc for leaving water). The above curve shows the cooling capacity variations at different entering water temperatures. Standard return air: 34ºC DB/28ºC WB; Temperature difference between entering and leaving water: 5ºC The cooling capacity correction factors are based on the cooling capacity (using 1 as the coefficient) in standard cooling water entering/ leaving conditions (7ºC for entering water/12ºc for leaving water). Heating capacity performance curve The above curve shows the heating capacity variations at different entering water temperatures. Standard return air: 21ºC DB; Temperature difference between entering and leaving water: 10ºC. The heating capacity correction factors are based on the heating capacity (using 1 as the coefficient) in standard cooling water entering/ leaving conditions (60ºC for entering water/50ºc for leaving water). The above curve shows the heating capacity variations at different entering water temperatures. Standard return air: 0ºC DB; Temperature difference between entering and leaving water: 10ºC The heating capacity correction factors are based on the heating capacity (using 1 as the coefficient) in standard cooling water entering/ leaving conditions (60ºC for entering water/50ºc for leaving water). NOTES: 1) THE BLACK CURVE SHOWS THE CAPACITY OF A 4-ROW-COIL UNIT AND THE GRAY CURVE THE CAPACITY OF A 6-ROW-COIL UNIT. 2) COMPARED WITH THE COEFFICIENT (SET TO 1) OF THE UNIT IN STANDARD OPERATING CONDITIONS (ENTERING WATER AT 60ºC, AND LEAVING WATER AT 50ºC), THE VARIATION COEFFICIENT VARIES AS FOLLOWS WHEN THE ENTERING WATER TEMPERATURE RETAINS AT 45ºC AND THE LEAVING WATER TEMPERATURE AT 40ºC: STANDARD AIR RETURN CONDITION: 0.65 FOR A 4-ROW-COIL UNIT AND 0.64 FOR A 6-ROW-COIL UNIT; STANDARD FRESH AIR CONDITION: 0.8 FOR A 4-ROW-COIL UNIT AND 0.78 FOR A 6-ROW-COIL UNIT. 7

9 Outlines and dimensions MHW015A, MHW020A, MHW025A Model Unit: mm Dimensions A B C D MHW015A MHW020A MHW025A MHW030A, MHW035A, MHW040A, MHW050A Model Unit: mm Dimension A B C D E MHW030A MHW035A MHW040A MHW050A

10 Electric Box Scheme of Electric Box Installation Electrical Heater Flexile Pipe Connection MHW Unit 9

11 Electrical data MODEL MHW015A MHW020A MHW025A MHW030A MHW035A MHW040A MHW050A POWER SOURCE TYPE INSULATION CLASS PROTECTION CLASS 220V/1/50Hz Asynchronous single phase B IP20 MOTOR RATED INPUT POWER 4 ROWS w 6 ROWS RATED INPUT CURRENT 4 ROWS A 6 ROWS NOTES: 1) ALL SPECIFICATIONS ARE SUBJECTED TO CHANGE BY THE MANUFACTURER WITHOUT PRIOR NOTICE. 2) ALL DATA ARE BASED ON HIGH SPEED,STANDARD ESP. MODEL MHW015A MHW020A MHW025A MHW030A MHW035A MHW040A MHW050A POWER SOURCE TYPE INSULATION CLASS PROTECTION CLASS 220V/1/60Hz Asynchronous single phase B IP20 MOTOR RATED INPUT POWER 4 ROWS w 6 ROWS RATED INPUT CURRENT 4 ROWS A 6 ROWS NOTES: 1) ALL SPECIFICATIONS ARE SUBJECTED TO CHANGE BY THE MANUFACTURER WITHOUT PRIOR NOTICE. 2) ALL DATA ARE BASED ON HIGH SPEED,STANDARD ESP. 10

12 Wiring diagrams MHW015A, MHW020A, MHW025A MHW030A, MHW035A, MHW040A, MHW050A 11

13 WIRING OF ELE-HEATER CONTROL CIRCUIT 220Vac(Main Power) L N PE TB1 A B TB2 L N RED RED RED BLUE G/Y F DPS TH PROTECTOR ELE-HEATER FACTORY WIRING FIELD WIRING NOTE: DPS DIFFER. PRESS SWITCH TH THERMAL OVERLOAD SWITCH F FUSE FOR TEMP. TB1-2 TERMINAL BLOCK 12

14 Installation Important Notice Installation and maintenance are to be performed only by technicians who are familiar with local rules and regulations, and experienced with this type of equipment. Make sure that the rated voltage of the power supply conforms to the voltage stated on the unit nameplate. Cut off all power supplies before mounting or maintaining the unit. Electric connections must conform to local laws and regulations. The voltage should fluctuate within the range of ± 10% of the rated voltage. The unit must be well earthed to prevent insulation failures. All the wires must be securely connected. The design of water pipes and ducts must conform to the specifications of heating, ventilation and air conditioning norms and regulations. Mounting Location Make sure it s convenient to connect wires and pipes in the selected mounting location. The minimum space reserved around MHW units is shown in Figure 1. Figure 1 13

15 Suspending Installation During suspending installation, please handle the unit or packing case with care, to avoid damage to any part. Before leaving the factory, the unit or its packing case already has forklift handling holes or hoisting holes. During the hoisting, the lifting poles should be strong enough to bear the unit weight. Please handle the MHW unit as shown in Figure 2. Storage When a unit is placed outdoors before it is installed in an equipment room, please protect it from dirt, rain, snow and even animals. Be sure not to damage the protective film on its surface. Base Setup Figure 2 Adjust the base level. The base, if not on a level surface, may result in water leakage or break the dynamic balance of the fan due to poor drainage of condensing water, or cause the bearing malfunction or vibrate. The base height should match the U-shaped pipe bend. The drain pipe should be connected with the U-shaped water seal, as shown in Figure 3. TRAP INSTALLATION DRAIN PIPE H NOT MORE THAN 1/2H DRAIN PLUG H is more than the negative pressure of unit + 20 mm 1mm H2O = 9.8 Pa Figure 3 14

16 Service and maintenance Notices Responsibilities and Obligations This product comes to you with the McQuay service warranty. Only McQuay technicians or experienced technicians authorized by McQuay are allowed to install, test or maintain these products. Use the Unit After installing the piping system, please first flush the pipes. To do so, be sure to shut off the valve connected to the unit, to prevent contamination in the pipes from entering the coils or blocking the loop. After the installation, please check there is anything sundries inside the fan. Turn the blades by hand. If no unusual noise is heard, turn on the fan, to see if it is running properly. Before turning on the water flow, please open the exhaust valve to let the air out of the pipe till water flows from the pipe. When the unit stops running, fill the coil with water or by other means to prevent pipe corrosion. When the environment temperature falls below 0 C in the winter, drain the pipe to prevent it from freezing. Clean the coils at regular intervals, to remove the dust from the coils. Clean the scale inside the coils every 2 or 3 years. If possible, please use soft water in the coils. Check the unit filter for dust regularly; if possible, please use a pressure difference gauge. Once the resistance reaches the limit, wash or replace the filter media in time. After the unit runs for a week, please readjust the V-belt. Afterwards, check the belt every three months. Service and Maintenance A good maintenance schedule helps reduce operational failures. A dirty filter may worsen the performance and air flow of the unit. Thus, replace or wash the filter in time. Be sure to check the filter every month to see if it is clean enough. Wash the coils with compressed air or water. Brush the coil surface gently with a soft brush or use a vacuum cleaner to clean the dust. Do the following on a regular basis: Clean up the fans every 6 months, to keep them in good balance. Check and clean the drain pan. Check the drain pipe in case dust or sundries block the pipes. Clean the dirt in the water coils at regular intervals. 15

17 Trouble shooting Common failures Abnormal sound Fan operates normally but the air flow is insufficient Location Possible causes Solutions 1. Blower Blower offset Loose bearing due to big gap Blower is loose Blower is damaged The fastening fan screw is loose There are sundries inside fans Contact the dealer Contact the dealer Contact the dealer Contact the dealer Fasten the screw Remove sundries 2. Drive The screw fixing the motor to the motor base is loose Fasten the screw 3. Fan housing 4. Electric appliances 5. Shaft 6. Air speed is too high 7. Periodical vibration 8. Noise caused by hi-speed wind passing the gap & holes 9. When blocked, the high-speed air rattles or howls There are sundries inside housing Housing is loose Air intake housing is damaged Remove sundries Contact the dealer Contact the dealer Incoming wire is loose Fasten the incoming wire Motor gives AC hum Bent or distorted Balance weight is loose Shaft is loose Duct is too small Static pressure doesn't reach the designed ESP value Duct is too small System is unstable Duct vibrates as the fan pulsates Duct leaks Duct bends abruptly Duct expands sharply Duct shrinks sharply Air speed is too high inside duct Anti-vibration joint is too high Contact the dealer Replace shaft Fasten the balance weight Fasten shaft Re-design the duct Use the lower fan speed. Re-design the duct Adjust the system Adjust the fan speed Seal it with glue Re-design duct Re-design duct Re-design duct Re-design duct Re-adjust the damping connector 1. Fan Blower is mounted incorrectly Contact the dealer. 2. Duct system Actual resistance exceeds the designed value. Duct is poorly sealed Fireproof damper is shut off Re-design the system Seal it with glue Turn on the fireproof damper 3. Filter Too dirty or blocked Clean or replace the filter 4. Coil Too dirty or blocked Clean coils 5. Air flow is short-circuited. The fan is functioning 1. System but the air supply is too large 6. Fan inlet is blocked 7. No straight tube at the fan air outlet 8. There are sundries inside fan system The air inlet and air outlet are not properly isolated. Thus, the air runs directly to the air inlet Elbow at the air return area fan outlet are too close to the unit wallboard The fan outlet is blocked Add air separator Move the fan Remove the obstructions A length of straight tube is mounted at the fan outlet during fan testing. Without straight tube, the fan performance might be worsened. Thus, the fan may run faster to overcome the resistance Install straight tube (check the fan speed) The fan outlet is blocked There is an elbow tube at the fan outlet Improper duct size The access door is open The system is not well balanced and the actual resistance is lower than the set resistance No air damper or air damper blade Filter falls off or no filter installed Remove the obstructions Re-design duct Re-design Close the access door Re-design the system Install air damper or air damper blade. Re-mount the filter 2. Duct Return duct leaks Seal with glue 1. Filter Filter is too dirty or blocked Clean or replace filter The air in the airconditioned room is 2. Fresh air No enough fresh air Supply more fresh air not fresh enough 16

18 Exploded view and part list MHW015A, MHW020A, MHW025A 1.Top panel 2.Assy.,coil 3.Drainpan 4.Check panel 5.Inlet/outlet panel 6.Long wind guard 7.Filter 8.Short wind guard. 9.Base panel 10.Side panel 11.Blower 12.Motor 13.Front panel 14.Flange 15.Hanging angel 17

19 MHW030A, MHW035A, MHW040A, MHW050A 1.Top panel 2.Assy.,coil 3.Drainpan 4.Check panel 5.Inlet/outlet panel 6.Long wind guard 7.Filter 8.Short wind guard. 9.Base panel 10.Side panel 11.Blower 12.Motor 13.Front panel 14.Flange 15.Hanging angel 18

20 Main part number Model MHW015A MHW020A MHW025A Blower M M M Motor(4 Rows) Motor(6 Rows) 50Hz 60Hz 50Hz 60Hz Clockwise M M M Anti-clockwise M M M Clockwise M M M Anti-clockwise M M M Clockwise M M M Anti-clockwise M M M Clockwise M M M Anti-clockwise M M M Filter M M M Drain Pan M M M Terminal Block M M M Model Discription MHW030A MHW035A MHW040A MHW050A Blower Left M M M M Blower Right M M M M Motor (4 Rows) Motor (6 Rows) 50Hz 60Hz 50Hz 60Hz Clockwise M M M M Anti-clockwise M M M M Clockwise M M M M Anti-clockwise M M M M Clockwise M M M M Anti-clockwise M M M M Clockwise M M M M Anti-clockwise M M M M Filter M M M M Drain Pan M M M M Terminal Block M M M M

21 ISO 9001 Certificate No.: BS-OHSAS Certificate No.: 7644 ISO Certificate No.: EMS McQuay International +1 (800) While utmost care is taken in ensuring that all details in the publication are correct at the time of going to press, we are constantly striving for improvement and therefore reserve the right to alter model specifications and equipment without notice. Details of specifications and equipment are also subject to change to suit local conditions and requirements and not all models are available in every market.