Installation and Operation Manual

Transcription

1 s Models MVS & MVW Air Source Models MVS Water Source models MVW Installation and Operation Manual Chapter 1 Introduction & Safety Information... 2 Chapter 2 General Description... 3 Chapter 3 Installation Preparation... 4 Chapter 4 Installation... 8 Chapter 5 Initial Start-Up & Shut Down Chapter 6 Maintenance Chapter 7 Troubleshooting Chapter 8 Warranty Appendix A Dimensional Drawings...A-1 Appendix B Wiring Schematics...B-1 Appendix C Start-Up Check List...C-1 Marvair Division of AIRXCEL, Inc PO Box 400 Cordele, GA Seedling Dr. Cordele, GA (229) Fax (229) marvair@airxcel.com Marvair Marine UK Unit 6 Benridge Park Holyrood Close Poole, Dorset BH17 7BD. +44 (0) MVS/MVW Installation & Operation Manual 10/2013 rev. 3 P/N 01850

2 Chapter 1 Introduction & Safety Information This manual is intended to be a guide to Marvair Marine s line of vertical air and water source air conditioners. It contains installation, troubleshooting, maintenance, warranty, and application information. The information contained in this manual is to be used by the installer as a guide only. This manual does not supersede or circumvent any applicable national or local codes. If you are installing the MVS or MVW air conditioners, first read Chapter 1 & 2 and scan the entire manual before beginning the installation as described in Chapter 4. Chapter 2 contains general, descriptive information and provides an overview which can speed up the installation process and simplify troubleshooting. If a malfunction occurs, follow this troubleshooting sequence: 1. Make sure you understand how the air conditioners works (Chapters 2 & 5). 2. Identify and correct installation errors (Chapter 4). 3. Refer to the troubleshooting information in Chapter 8. If you are still unable to correct the problem, contact the Factory at for additional assistance. Please read the following Important Safety Precautions before beginning any work. Important Safety Precautions 1. USE CARE when LIFTING or TRANSPORTING equipment. 2. TRANSPORT the UNIT UPRIGHT. Laying it down on its side may cause oil to leave the compressor and breakage or damage to other components. 3. TURN ELECTRICAL POWER OFF AT THE breaker or fuse box BEFORE installing or working on the equipment. LINE VOLTAGES ARE HAZARDOUS or LETHAL. 4. OBSERVE and COMPLY with ALL applicable PLUMBING, ELECTRICAL, and BUILDING CODES and ordinances. 5. SERVICE may be performed ONLY by QUALIFIED and EXPERIENCED PERSONS. * Wear safety goggles when servicing the refrigeration circuit * Beware of hot surfaces on refrigerant circuit components * Beware of sharp edges on sheet metal components * Use care when recovering or adding refrigerant 6. Use COMMON SENSE BE SAFETY-CONSCIOUS This is the safety alert symbol. When you see this symbol on the unit and in the instruction manuals be alert to the potential for personal injury. Understand the signal word DANGER, WARNING and CAUTION. These words are used to identify levels of the seriousness of the hazard. DANGER WARNING Failure to comply will result in death or severe personal injury and/or property damage. Failure to comply could result in death or severe personal injury and/or property damage. CAUTION Failure to comply could result in minor personal injury and/or property damage. IMPORTANT is used to point out helpful suggestions that will result in improved installation, reliability or operation. MVS & MVW Installation & Operation Manual 10/2013 rev.3 Page 2 of 18

3 Chapter General Description The Marvair Marine self-contained water and air cooled air conditioners are designed for indoor use in marine applications for both new installations and for replacement of older, less efficient units. The air conditioners are available in cooling capacities of 5, 7½, 10, 12, 15, & 20 tons (60,000; 90,000; 120,000; 144,000; 180,000 and 240,000 BTUH s) and are controlled by a conventional 24 VDC wall mounted, HVAC type thermostat. The vertical configuration minimizes floor space and blends into a variety of working environments. The cool, dry air can be discharged directly into the room or ducted into adjacent rooms. To ensure years of dependable performance, all components are housed in a superior corrosion resistant steel cabinet. Air Cooled Units The MVS air cooled units have an indoor air mover, coil, compressor and controls. A remote condenser (not provided by Marvair) connects to the MVS unit with field installed refrigerant lines. The units are shipped with a dry nitrogen charge and may be used with either R-22 or R-407c refrigerant. Water Cooled Units The MVW water cooled air conditioners are packaged units shipped from the factory with R-407c refrigerant and an internal condenser and ready to run. The coaxial tube-in-tube condenser is constructed of corrosion resistant cupronickel water tubing and copper refrigerant tubing for use in either fresh or sea water. The 10, 12, 15 and 20 ton air conditioners have two compressors, allowing for staged operation. The dual compressors can be programmed to start sequentially, minimizing start-up amps. In addition to better humidity control and comfort, the dual compressors provide back-up protection, increased operating efficiencies and energy savings. The units are pre-piped and wired, minimizing installation time. The readily accessible control center contains all the control components. On the MVS (air cooled) units, a 24 VAC relay is included to cycle the condenser fans ON & OFF with the compressors. Each condensate pan has two drains to prevent condensate from standing in the base pan. The drain lines are internally tied together. The condensate drain line opening is conveniently located on the right side of the air conditioner to facilitate connection of the external condensate line. A manual high pressure switch and an auto reset low pressure switch protect the compressors under abnormal operating conditions. A three minute delay on make safeguards the compressors from destructive short cycling. The evaporator coils have a baked polyester coating rated to 1,000 hours salt spray test. The return air filters are located behind the return air grille and are accessible from the front of the unit. High Pressure Switch The high pressure switch is mounted on the compressor's discharge rotalock valve. The compressor will shutdown if the refrigerant rises to 350 PSIG. This protects the compressor if the condenser air flow is restricted or if the outdoor fan motor fails (MVS units) or the pump fails (MVW units). The high pressure switch must be manually reset before the compressor circuit can be turned on. The reset button is located on the back of the switch. MVS & MVW Installation & Operation Manual 10/2013 rev.3 Page 3 of 18

4 Low Pressure Switch The low pressure switch is mounted between the compressor and the compressor's suction rota-lock valve. It is designed to open if the refrigerant pressure in the suction line drops below 25 PSIG; it resets when the pressure rises to 50 PSIG. This switch protects the unit if airflow through the indoor coil is restricted, the blower fails or there is a loss of refrigerant. 2.2 Model Identification AC Refrigerant N = Nitrogen charge C = R-407c MVS = Marine Vertical Split (air source) MVW = Marine Vertical Water (water source) Nominal Cooling Capacity (BTUH) 60 = 60, = 90, = 120, = 144, = 180, = 240,000 Air Conditioner Power Supply C = V, 3ø, 60Hz D = 460V, 3ø, 60Hz Cabinet Color 216 = Gray Cabinet (standard) 116 = Beige Cabinet (optional) 2.3 Serial Number Date Code Month Year A = January G = July A = 2011 B = February H = August B = 2012 C = March J = September C = 2013 D = April K = October D = 2014 E = May L = November F = June M = December IMPORTANT WHEN THE AIR CONDITIONER IS INSTALLED, MODEL NUMBER AND SERIAL NUMBERS ARE TO BE RECORDED AND MAINTAINED IN A LOCATION FOR IMMEDIATE ACCESS WHEN REQUESTING FURTHER INFORMATION CONCERNING THIS UNIT. 3.1 Installation Preparation Chapter 3 Inspect the air conditioner The air conditioners are shipped on 4 x 4 wood base frames and wrapped in shrink wrap. Remove the shrink wrap and verify the model number of the unit against the shipping order. Make sure power supply at site matches the power supply of the air conditioner. Check the air conditioner for any damage that may have occurred during shipping, especially concealed damage. If the air conditioner is damaged or the shipment is not complete, immediately (within 14 days) file a claim with the freight company. The units should be stored inside and not exposed to weather. MVS & MVW Installation & Operation Manual 10/2013 rev.3 Page 4 of 18

5 Installation requirements The MVS and MVW air conditioners must be installed on a hard, level, smooth surface. Do not install the air conditioner on a carpeted floor. Condensate The locations of the condensate openings are shown on the dimensional drawings in Appendix A. The factory installed condensate connection on the cabinet is a female, PVC fitting designed for a ¾ slip connection. Access for the condensate tubing is on the right side or the unit. CAUTION INSPECT THE FLEXIBLE CONDENSATE DRAIN LINE INSIDE THE AIR CONDITIONER FOR KINKS OR OBSTRUCTIONS IN THE LINE. CORRECT AS REQUIRED. Power and control (thermostat) wiring Line voltage power supply must be sized to provide adequate power for the operation of the specific model air conditioner. Information on line power requirements, line sizing and fuse sizing is shown on data label on unit. The line power conductors and control (thermostat) conductors enter the air conditioner through knockouts on the right side of the cabinet. The location of the knockouts are shown on the dimensional drawings in Appendix A. Depending on the location of the air conditioner, the exact rough-in location for power lines and low voltage conductors in the room can be determined. Allow sufficient length for both the high and low voltage conductors (approximately 6 feet) from the outside of the cabinet to the low voltage terminal board and the internal disconnect. Location and Clearances All MVS and MVW air conditioners have hinged doors on the front to facilitate access to the primary components. The doors can be removed from the cabinet by removing the pins in each door. Thirty-six inches must be allowed in front of the units to permit the doors to swing open. For units with right side electrical, condensate, refrigerant and water connections, allow sufficient space between the air conditioner and an obstruction, e.g. a wall, to connect the lines. Minimum clearance in the rear is zero inches. Clearance above the unit side depends on the space required for the plenum and ductwork. MVS & MVW Installation & Operation Manual 10/2013 rev.3 Page 5 of 18

6 Clearance for connections: 20" (508mm) Clearance for door opening: 36" (914mm) Figure 1. Clearances 3.2 Water connections on MVW water cooled air conditioners The water in and water out connections on the air conditioners are on the right side of the unit. Since the MVW120 & 144 have two compressors and each compressor can operate independently, two sets of water pipes are required. 3.3 Remote air cooled condenser for MVS units On MVS units with a remote condenser(s), locate the condenser(s) so that air flow is unrestricted on all sides and above the condenser. Place the remote condensing unit(s) according to the condensing unit s installation instructions. Select a location that will minimize the length and complexity of the piping runs. See Table 1 for size of piping. The refrigerant connections for the units are on the right side of the unit. Since the MVS120, 144, 180 & 240 have two compressors and each compressor can operate independently, two sets of refrigerant lines and two independent condensers or a condenser with two independent circuits are required. An appropriately sized condenser must be selected based upon the cooling capacity of the compressor. MVS & MVW Installation & Operation Manual 10/2013 rev.3 Page 6 of 18

7 Unit Length of Run (feet) Model Circuit Connect Size HG LIQ HG LIQ HG LIQ HG LIQ HG LIQ HG LIQ HG LIQ MVS60 1 5/8 5/8 5/8 5/8 7/8 5/8 7/8 5/8 7/8 5/8 7/8 5/8 7/8 5/8 MVS90 1 5/8 5/8 7/8 5/8 7/8 5/8 7/8 5/8 1-1/8 5/8 1-1/8 5/8 1-1/8 5/8 MVS120 MVS144 MVS180 MVS /8 5/8 5/8 5/8 7/8 5/8 7/8 5/8 7/8 5/8 7/8 5/8 7/8 5/8 2 5/8 5/8 5/8 5/8 7/8 5/8 7/8 5/8 7/8 5/8 7/8 5/8 7/8 5/8 1 5/8 5/8 7/8 5/8 7/8 5/8 7/8 5/8 1-1/8 5/8 1-1/8 5/8 1-1/8 5/8 2 5/8 5/8 5/8 5/8 7/8 5/8 7/8 5/8 7/8 5/8 7/8 5/8 7/8 5/8 1 5/8 5/8 7/8 5/8 7/8 5/8 7/8 5/8 1-1/8 5/8 1-1/8 5/8 1-1/8 5/8 2 5/8 5/8 7/8 5/8 7/8 5/8 7/8 5/8 1-1/8 5/8 1-1/8 5/8 1-1/8 5/ /8 7/8 1-1/8 7/8 1-1/8 7/8 1-1/8 7/8 1-3/8 7/8 1-3/8 7/8 1-3/8 7/ /8 7/8 1-1/8 7/8 1-1/8 7/8 1-1/8 7/8 1-3/8 7/8 1-3/8 7/8 1-3/8 7/8 Table 1. Recommended Refrigerant Line Sizes Duct The evaporator blowers in the MVS and MVW units were selected to be used with duct. Refer to Table 2 for air flow at various static pressures. Model Number Various Static Pressures for v. 3ø, 60 Hz. air conditioners Indoor Motor / Blower Air Flow (CFM) at External Static Pressure (in. wg) HP Qty ,365 2,165 1,980 1,775 1, ,400 3,115 2,850 2,560 2, ,950 4,535 4,150 3,725 3, ,350 4,900 4,485 4,025 3, ,550 6,000 5,490 4,925 4, ,730 8,000 7,320 6,570 5,805 Model Number Various Static Pressures for 460v. 3ø, 60 Hz. air conditioners Indoor Motor / Blower Air Flow (CFM) at External Static Pressure (in. wg) HP Qty ,640 2,420 2,215 1,990 1, ,700 3,390 3,100 2,785 2, ,800 4,400 4,025 3,615 3, ,200 4,765 4,360 3,915 3, ,360 5,825 5,530 4,780 4, ,480 7,770 7,110 6,380 5,635 Air flows were measured with a wet indoor coil. Table 2. CFM at Various Static Pressures CAUTION THE DUCT SYSTEM MUST BE ENGINEERED TO PROVIDE SUFFICIENT AIR FLOW THROUGH THE AIR CONDITIONER, EVEN UNDER ADVERSE CONDITIONS SUCH AS A DIRTY FILTER. PROPER DESIGN OF THE DUCT SYSTEM IS CRITICAL TO MAXIMUM PERFORMANCE AND QUIET OPERATION. MVS & MVW Installation & Operation Manual 10/2013 rev.3 Page 7 of 18

8 4.1 Installation Chapter 4 Rig and place the air conditioner WARNING: UNITS ARE HEAVY THE MVS AND MVW AIR CONDITIONERS WEIGH IN EXCESS OF 1,000 LBS. WHEN MOVING THE UNIT, SUFFICIENT MANPOWER AND MECHANICAL EQUIPMENT MUST BE USED TO PREVENT DAMAGE TO THE UNIT AND INJURY TO PEOPLE. TO FACILITATE MOVING THE AIR CONDITIONER, IT MAY BE NECESSARY TO LAY THE UNIT ON ITS SIDE ON DOLLIES. IF THIS IS REQUIRED, USE MULTIPLE DOLLIES AND PLACE THE UNIT ON ITS LEFT SIDE. THE UNIT SHOULD NOT REMAIN ON ITS SIDE ANY LONGER THAN REQUIRED FOR THE ACTUAL MOVING PROCESS. IF THE AIR CONDITIONER HAS BEEN ON ITS SIDE, DO NOT ATTEMPT TO START THE UNIT UNTIL IT HAS BEEN VERTICAL FOR AT LEAST 24 HOURS. To lift the air conditioners, use slings with a spacer under the base skid to prevent damage to the cabinet when using a hoist. The air conditioners are designed to minimize noise and vibration. If additional dampening is desired, place a rubber mat or other material designed for this purpose and of sufficient quality to support the weight of the air conditioner. Unit must be level; not to exceed 1/8 per linear foot in any direction. Figure 2. Rigging Details MVS & MVW Installation & Operation Manual 10/2013 rev.3 Page 8 of 18

9 MVS refrigerant line connections and charging Install the remote air cooled condenser in accordance with the installation instructions provided with the condenser. Locations for the connection of the refrigerant lines are shown on the dimensional drawings in Appendix A. Recommended line sizes are shown in Table 1. Trap Must Be Above Condenser Coil Line Slopes Toward Condenser Remote Condensing Unit MVS Unit Hot Gas Line Liquid Line Hot Gas Line MVS Unit Liquid Line Line Slopes Toward Condenser Remote Condensing Unit Figure 3a. Condenser above evaporator Figure 3b. Evaporator above condenser The MVS air conditioners are shipped with a holding charge of nitrogen. After refrigerant connections are made, release the nitrogen, evacuate, leak test and charge the system as described below. Charging MVS units A. When outdoor condenser is not precharged with refrigerant. 1. Open hot gas and liquid line service valves. 2. Purge the nitrogen holding charge evacuate and leak test the system. 3. Using standard refrigeration charging techniques and charging charts, add refrigerant as required to maintain proper operating conditions. Additional charge is required for piping runs over 25 feet (760 cm). Add charge at the rate of 0.38 oz. per foot for piping runs over 25 feet (760 cm). B. When outdoor condenser is precharged with refrigerant. 1. Connect line sets to the indoor unit and outdoor condensing unit. 2. Purge the nitrogen from the indoor unit, evacuate and leak test the unit. 3. Open the service valves and add refrigerant to maintain proper operating conditions. Additional charge is required for piping runs over 25 feet (760 cm). Add charge at the rate of 0.38 oz. per foot for piping runs over 25 feet (760 cm). MVS & MVW Installation & Operation Manual 10/2013 rev.3 Page 9 of 18

10 IMPORTANT CHARGE THE COMPRESSOR ON BOTH THE HIGH AND LOW SIDES SIMULTAN-EOUSLY TO PREVENT AXIAL LOADING OF THE SCROLL, WHICH MAY CAUSE A TEMPORARY NO START CONDITION FOR THE COMPRESSOR. IF THIS OCCURS, LEAVE THE COMPRESSOR OFF FOR 30 MINUTES BEFORE RESTARTING, ALLOWING THE INTERNAL PRESSURES TO EQUALIZE. IF REMOVING THE COMPRESSOR, EVACUATE BOTH THE HIGH AND LOW SIDE SIMULTANEOUSLY. Use charging chart supplied with the condenser, if available. If not available, block off enough of the condenser coil to maintain 220 psig discharge pressure and charge to 15 F to 20 F subcooling according to Table 3, Required Liquid Line Temperature ( F) at Service Valve. Required Liquid Pressure (PSIG) at Service Valve Subcooling ( F) Table 3. Required Liquid Line Temperature ( F) at Service Valve R-22 MVW water line connections The MVW air conditioners have an internal condenser. The location of the water in and water out connections are shown on the dimensional drawings in Appendix A. Size the water lines to provide the minimum water flow rates shown in Table 4. When connecting the water lines, hold the condenser inlet and outlet stubs firmly with a wrench to prevent twisting. Observe all applicable codes. Minimum Seawater Flow Rates Model Circuit Gallon/Hour Liters/Minute Minimum Maximum Minimum Maximum MVW , MVW , , MVW , Total 1,200 2, , MVW , Total 1,500 2, , MVW , Total 1,800 3, MVW ,200 2, ,200 2, Total 2,400 4, Table 4. Minimum Seawater flow rates by Model Proper water flow is absolutely critical to the operation of the air conditioner. If the pipe is too small, back pressure is created causing a drop in water flow, even if the pump is correctly sized. If MVS & MVW Installation & Operation Manual 10/2013 rev.3 Page 10 of 18

11 the piping is too large, the slow velocity of the water may cause silt build-up and barnacle growth inside the piping, eventually restricting water flow. The best material for sea water piping and fittings is cupronickel. Suitable materials for piping are hi-grade bronze cupronickel and schedule 80 PVC pipe. Materials to avoid are yellow brass, copper, poor grades of aluminum, stainless steel or steel pipe. Use Teflon tape or other appropriate sealant on all threaded fittings to prevent leaks. Duct Connect the duct or plenum to the flange on top to the units. The duct system must be engineered to insure sufficient air flow. This includes proper duct sizing and a sufficient number of supply registers. Duct must be firmly attached, secured and sealed to prevent air leakage. When using insulated flexible duct, make sure that the inner duct is secured and sealed to an adapter before pulling the insulation over the connection. Install the supply grilles (if used) high on the cabin wall to create good air circulation. Insulate all transitions and plenums. Stretch the duct tight in straight runs. Make bends and turns as large as possible. Galvanized metal duct extensions may be used to simplify connections to duct work and grilles. Use fabric boots to prevent transmission of vibration through the duct system. If the duct is in storage or other high traffic areas, protect it from being crushed with a shield or box. To prevent short cycling of the air conditioner, take care not to direct the conditioned air directly onto the thermostat. DANGER CARBON MONOXIDE POISONING IF THE DUCT MUST BE RUN THROUGH AREAS CONTAINING ENGINES OR FOSSIL FUEL DEVICES, IT IS ABSOLUTELY MANDATORY THAT THE DUCT SYSTEM BE AIR TIGHT TO PREVENT CARBON MONOXIDE AND ANY OTHER HAZARDOUS GASES OR VAPORS FROM BEING INTRODUCED INTO THE CONDITIONED AIR SYSTEM. SEE ABYC STANDARD A-6 REFRIGERATION AND AIR CONDITIONING EQUIPMENT FOR MORE INFORMATION ON INSTALLING DUCT THROUGH THESE AREAS. Condensate connection and disposal The air conditioners will produce significant quantities of condensate in most marine applications that may cause significant damage to the vessel if not disposed of properly. The condensate openings on the units are from the right side. Always install a trap in the condensate line to ensure proper drainage and to prevent condensate from overflowing the evaporator drain pan. Refer to the drawings in Appendix A for the exact location of the condensate openings. DANGER CARBON MONOXIDE POISONING IF THE CONDENSATE LINE MUST BE RUN THROUGH AREAS CONTAINING ENGINES OR FOSSIL FUEL DEVICES, IT IS ABSOLUTELY MANDATORY THAT THE LINE BE AIR TIGHT TO PREVENT CARBON MONOXIDE AND ANY OTHER HAZARDOUS GASES OR VAPORS FROM BEING INTRODUCED INTO THE CONDITIONED AIR SYSTEM. SEE ABYC STANDARD A-6 REFRIGERATION AND AIR CONDITIONING EQUIPMENT FOR MORE INFORMATION ON INSTALLING A CONDENSATE LINE THROUGH THESE AREAS. MVS & MVW Installation & Operation Manual 10/2013 rev.3 Page 11 of 18

12 4.2 Electrical Connection WARNING ELECTRIC SHOCK HAZARD FAILURE TO FOLLOW SAFETY WARNINGS EXACTLY COULD RESULT IN SERIOUS INJURY, DEATH AND OR PROPERTY DAMAGE. TURN OFF ELECTRICAL POWER AT SERVICE PANEL BEFORE MAKING ANY ELECTRICAL CONNECTIONS AND ENSURE A PROPER GROUND CONNECTION IS MADE BEFORE CONNECTING LINE VOLTAGE. All electrical work must meet the requirements of all applicable codes and ordinances. Work should only be done by qualified persons. If the wiring diagram that is on or was shipped with the unit is different from the one in this manual, refer to and use the wiring diagram that is on or was shipped with the unit. High Voltage Wiring The MVS and MVW air conditioners are available for operation on a 208/230v. 3ø, 60 Hz. or a 460v, 3ø, 60 Hz. Power supply. Refer to the data label on the air conditioner for field requirements. The electrical data list fuse/hacr breaker and wiring size amps. a) The power supply must have the proper voltage, phase and ampacity for the selected model. b) Refer to the data label on the unit for field wiring requirements. The electrical data lists fuse and wire sizes for the unit. c) Each unit has a Minimum Circuit Ampacity (MCA). Field wiring must be used that is of sufficient size to carry that amount of current. Use copper conductors only. Refer to the National Electrical Code for complete current carrying capacity data on the various insulation grades of wiring materials. d) Power supply must be within allowable range of ±10% of rated voltage. e) The unit must be properly grounded to reduce the risk of shock or electrocution. f) A properly sized circuit breaker must be used. Information required to size the breaker is on the data sticker on the unit. g) The breakers must be motor rated type B or, preferably type C. h) Connections between the ship s alternating current grounding conductor and the ship s negative or bonding system must be made as part of the ship s wiring as per ABYC standard E-11 or equivalent. i) When servicing or replacing existing equipment that contains a chassis mounted ground lug, the service person or installer must verify the ship s wiring for the connection required in item e & h. above. j) All electrical connections must be made within the electrical junction boxes supplied with the unit. A terminal strip and/or electrical connectors are provided for component installation. MVS & MVW Installation & Operation Manual 10/2013 rev.3 Page 12 of 18

13 IMPORTANT Scroll compressors, like several other types of compressors, will only compress in one rotational direction. The direction of rotation is not an issue with single-phase compressors since they will always start and run in the proper direction. However, three phase compressors will rotate in either direction depending upon phasing of power. Since there is a chance of connecting power in such a way as to cause rotation in the reverse direction, it is imperative to confirm that the compressor is rotating in the proper direction at the initial field start-up of the system. Verification of proper rotation is made by observing that the suction pressure drops and the discharge pressure rises when the compressor is energized. An alternate method of verification for self-contained system with small critical refrigerant charges, where the installation of gauges may be objectionable, can be made by monitoring the temperature of the refrigerant lines at the compressor. The temperature should rise on the discharge line while the suction line temperature decreases. Reverse rotation also results in a substantially reduced current draw when compared to tabulated values. There is no negative impact on durability caused by operating three phase compressors in the reversed direction for a short duration of time, usually defined as less than one hour. However, after several minutes of operation the compressor s internal protector will trip. The compressor will then cycle on the protector until the phasing is corrected. Reverse operation for longer than one hour may have a negative impact on the bearings. 1. Size the incoming power supply lines according to Code requirements. Run the power conductors through the knockouts on the right side of the unit. Use appropriate conduit and strain reliefs. 2. Connect the wires to the input side of the internal breaker or terminal block L1, L2, & L3 for three-phase models. 3. Install the ground wire on the ground lug. 4. For units designed for operation on 208/230V, 60Hz power supply, the transformer is factory wired for a 230V power supply. For a 208V power supply, remove the orange lead from the transformer and connect the red lead. Insulate the orange lead. MVS & MVW Installation & Operation Manual 10/2013 rev.3 Page 13 of 18

14 Low Voltage (Control) Wiring IMPORTANT The following instructions are generic wiring instructions and may not be applicable for all thermostats. Always refer to the wiring diagram in the air conditioner for the proper method to wire your unit. The air conditioner uses an electronic thermostat mounted in the conditioned space. The MVx60 and MVx90 have one compressor. A single stage cooling thermostat may be used with these units. The MVx120 and MVx144 air conditioners have two compressors. For optimal temperature control, a 2-stage cooling thermostat should be used with these units. 1. Pull the low voltage wiring (e.g., 18 gauge 4-conductor Class 2 thermostat wire) from the air conditioner into the thermostat / sub base assembly. See Appendix B for connections to various thermostats. 2. Mount the thermostat on the wall of the cabin. The thermostat should be located so that the supply air from the unit does NOT blow directly on to the thermostat. Connect the thermostat to the terminal block in the conditioner as shown in Appendix B. Chapter 5 Initial Start-Up & Shut Down Important: Be sure that the crankcase heater (if used) has been energized for at least 24 hours before starting the unit(s). Double-check all electrical connections before applying power. MVS & MVW air conditioners with scroll compressors running on 3Ø power must be checked for proper rotation during the initial start-up. Please refer to Chapter 4 for determining if the 3Ø compressors are rotating correctly. Incorrect rotation can damage the compressor and is not covered by the warranty. Procedure: 1. Set the cooling set point temperature on the wall thermostat to a point higher than the cabin temperature. 2. Set the thermostat system switch in the AUTO or COOL position. Nothing should operate at this time. 3. Set the time delay on the control board in the control box to three minutes. 4. On MVW units (water source) turn on the condenser water supply. On MVS units, open the refrigerant lines. Refer to 4.1 for recommended installation procedures. 5. Slowly lower the thermostat's cooling set point temperature until the switch closes. The indoor fan should operate. Once the indoor fan turns on, allow approximately three minutes for the compressor to start. On MVS units, verify operation of the condenser fans. The fans should be running during compressor operation. 6. While the compressor is operating, check for proper phasing as described in Chapter To stop cooling, slowly raise the thermostat cooling set point to a temperature higher than the ambient. If the unit fails to operate, refer to the troubleshooting information in Chapter Set thermostat for comfort as desired. MVS & MVW Installation & Operation Manual 10/2013 rev.3 Page 14 of 18

15 NOTE: The fan purge allows the indoor fan to run for approximately 90 seconds after the compressor is off. Air Conditioner Shut Down Turn thermostat s selector switch to the OFF position. Do not shut off main power to the unit except to service the air conditioner. Winter Shut Down (MVW water cooled units only) 1. If the air conditioner may be exposed to freezing temperatures, drain the water from the condenser and all water piping. 2. Pump a non-corrosive, potable anti-freeze solution throughout the system s water supply and discharge lines. Be sure to follow all state, local and federal ordinances if discharging the antifreeze solution overboard. 3. Run the air conditioner until a steady stream of anti-freeze solution is being discharged. Maintenance Chapter 6 Scheduled Maintenance Marvair strongly recommends that the air conditioner be serviced a minimum of twice a year. At this time the filters, evaporator coil, condenser coil(s), the cabinet, and condensate drain should be serviced as described below. In addition to this seasonal check-out, the air conditioner should be maintained as follows: Standard Air Filters Replace the air filters whenever it is visibly dirty. Never operate the air conditioner without the return air filters in place. If washable filters are used, flush with hot water or steam or soak in a mild water solution with soap or detergent. Refer to filter manufacturer s instructions as necessary. Two inch filters are available for many units. Model Part Size Unit Filters Number (Inches) MM Qty Total x 20 x x 508 x x 25 x x 635 x x 25 x x 635 x x 25 x x 635 x x 25 x x 635 x x 25 x x 635 x x 20 x x 508 x x 25 x x 635 x x 20 x x 508 x x 25 x x 635 x Table 5. Filter Sizes by Model Evaporator If the evaporator becomes clogged or dirty, it may be cleaned by careful vacuuming or with a MVS & MVW Installation & Operation Manual 10/2013 rev.3 Page 15 of 18

16 commercial evaporator cleaning spray. DO NOT use a solvent containing bleach, acetone, or flammable substances. Turn off power before cleaning. Be careful not to wet any of the electrical components. Be sure the unit has dried before restarting. Use a fin comb of the correct tooth spacing to straighten mashed or bent fins. Condenser MVS units (air cooled). TURN OFF POWER BEFORE CLEANING! Be sure that all electrical components are thoroughly dry before restoring power. Periodically inspect the outdoor condenser for dirt or obstructions. Remove foreign objects such as leaves, paper, etc. If the condenser coil is dirty, it may be washed off with a commercial solvent intended for this purpose. MVW units (water cooled). Verify that the unit has proper water flow. If insufficient water flow, check any strainers and pumps for debris. If water flow still insufficient, descaling of the water lines may be required. Cabinet The cabinet may be cleaned with a sponge and warm, soapy water or a mild detergent. Do not use bleach, abrasive chemicals or harmful solvents. Drains Regularly check the condensate drain. An obstruction will force water to dump into the middle of the unit and drain out the sides of the air conditioner, causing water on the floor. Lubrication Oiling of the the evaporator blower motor is not required as the motor is sealed and does not need oiling Troubleshooting Chapter 7 MVS & MVW Installation & Operation Manual 10/2013 rev.3 Page 16 of 18

17 Chapter 8 Warranty Marvair Marine Warranty for Models MVS & MVW air conditioners Parts If any part of your Marvair unit fails because of a manufacturing defect within fifteen months from the date of original shipment by Marvair of the air conditioner or within twelve months from the date of start-up of the air conditioner, whichever is the earlier date, Marvair will furnish without charge, EXW Cordele, Georgia, the required replacement part. The responsibility of the Owner of the Equipment includes the following: 1. To operate the equipment according to the manufacturer's instructions. 2. To provide easy accessibility for service. 3. To check and reset circuit breaker(s) and disconnect before calling for service. (Circuit breaker(s) may be in the main service panel.) 4. To keep the unit clean and free of dirt. 5. To clean and/or replace the filters as required. 6. To keep the evaporator coil clean and on MVW units to keep the condenser coil free of sediment or scale. On MVS units, to keep the both the evaporator and condenser coils clean. 7. To pay the charges incurred when any of the above have not been done. 8. To pay for repair or replacement of any material or part other than those within the Marvair unit or thermostat itself. 9. To check any fuses on the circuit board and replace as required. The owner of the product may ship the allegedly defective or malfunctioning product or part to Marvair, at such owner s expense, and Marvair will diagnose the defect and, if the defect is covered under this warranty, Marvair will honor its warranty and furnish the required replacement part. All costs for shipment and risk of loss during shipment of the product or part to Marvair and back to the owner shall be the responsibility and liability of the owner. Upon request by an owner, Marvair may arrange for remote diagnosis and repair of the allegedly defective or malfunctioning product or part. An owner requesting performance under this Warranty shall provide reasonable access to the allegedly defective or malfunctioning product to Marvair and its authorized agents and employees. This warranty does not cover damage caused by improper installation including any refrigerant leaks in the tubing and fittings between the evaporator and condenser sections on split systems; misuse of equipment; negligent servicing; damage due to use of the product for purposes other than those for which it was designed; damage caused by natural disasters, power surges, lightning and submersion; damage caused by unauthorized modifications; and damage caused by improper wiring or power supply to the air conditioner including operating the unit with an undersized generator or condenser. MVS & MVW Installation & Operation Manual 10/2013 rev.3 Page 17 of 18

18 THIS WARRANTY AND SERVICE POLICY CONSTITUTE THE EXCLUSIVE REMEDY OF ANY PURCHASER OF A MARVAIR AIR CONDITIONER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR USE, TO THE FULLEST EXTENT PERMITTED BY LAW. IN NO EVENT SHALL ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR USE EXCEED THE TERMS OF THE APPLICABLE WARRANTY STATED ABOVE AND MARVAIR SHALL HAVE NO OTHER OBLIGATION OR LIABILITY. IN NO EVENT SHALL MARVAIR BE LIABLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES OR MONETARY DAMAGES. THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, AND YOU MAY ALSO HAVE OTHER RIGHTS WHICH VARY FROM STATE-TO-STATE. Some states do not allow limitations or exclusions, so the above limitations and exclusions may not apply to you. MVS & MVW Installation & Operation Manual 10/2013 rev.3 Page 18 of 18

19 Appendix A - Dimensional Drawings Dimensional Drawings - MVx60 Shipping Weights Model LBS KG MVS MVW MVS & MVW Installation & Operation Manual 10/2013 rev.3 Page A-1

20 Dimensional Drawings - MVx90/120 Shipping Weights Model LBS KG MVS MVW MVS MVW MVS & MVW Installation & Operation Manual 10/2013 rev.3 Page A-2

21 Dimensional Drawings - MVx180/240 Shipping Weights Model LBS KG MVS180 TBD TBD MVW180 TBD TBD MVS240 TBD TBD MVW240 TBD TBD MVS & MVW Installation & Operation Manual 10/2013 rev.3 Page A-3

22 Appendix B - Electrical Schematics Electrical Schematics - MVS60 for 460v., 3ø, 60 Hz. Power Supply MVS & MVW Installation & Operation Manual 10/2013 rev.3 Page B-1

23 Electrical Schematics - MVS120 for 460v., 3ø, 60 Hz. Power Supply MVS & MVW Installation & Operation Manual 10/2013 rev.3 Page B-2

24 Electrical Schematics - MVW120 for 460v., 3ø, 60 Hz. Power Supply MVS & MVW Installation & Operation Manual 10/2013 rev.3 Page B-3

25 Electrical Schematics - MVW180 & 240 for 460v., 3ø, 60 Hz. Power Supply MVS & MVW Installation & Operation Manual 10/2013 rev.3 Page B-4

26 Appendix C - Start-Up Check List A. B. Equipment Information Marvair Air conditioner Model No. Serial No. Compressor: Model No. Serial No. Compressor: Model No. Serial No. Condenser: Model No. Serial No. Pre-Start Up Indoor Unit Is there any shipping damage? (Y/N) If so, where? Will this damage prevent starting the unit? (Y/N) Check Power Supply, does it agree with data sticker on air conditioner? (Y/N) Has the ground wire been connected? (Y/N) Has the circuit protection been sized and installed properly? (Y/N) Controls MVS air cooled units only. a) Has fan control for the remote condenser(s) been installed? (Y/N) b) Do outdoor condenser fans operate when required? (Y/N) Are thermostat and indoor blower control wiring connections made and checked? (Y/N) Are all wiring terminals (including main power supply) tight? (Y/N) Has crankcase heater been energized for 24 hours? (Y/N) Is control transformer wired for correct voltage? (Y/N) Evaporator Section Has water been placed in drain pan to confirm proper drainage? (Y/N) Has trap been properly installed? (Y/N) Are correct filters in place? (Y/N) MVS & MVW Installation & Operation Manual 10/2013 rev.3 Page C-1

27 Water Piping (MVW water cooled units only) Have water connections been checked? (Y/N) Is water circulating pump operating properly? (Y/N) Refrigerant Piping (MVS units only) Have leak checks been made at the valves and all refrigerant connections, including, solenoid valves, filter driers with a leak detector? (Y/N) If leaks are found, repair and report any leaks. C. Check Voltage Imbalance Line to Line Volts AB V AC V BC V (AB + AC + BC)/3 = Avg. Voltage = Max. deviation from avg. voltage = volts Voltage imbalance = (100 x Max. Deviation)/avg. Voltage = % If the voltage imbalance is greater than 2%, do not attempt to start the air conditioner! Correct imbalance before starting the unit. D. Check & Record Refrigerant Pressures After 10 minutes of compressor operation, record the following: Circuit 1 Circuit 2 Suction Pressure Suction Line Temperature Discharge Pressure Discharge Line Temperature Entering Condenser Air or Water Temp Leaving Condenser Air or Water Temp Evap. Entering Air DB Temp Evap. Entering Air WB Temp Evap. Leaving Air DB Temp Evap. Leaving Air WB Temp Compressor Amps (L1) Compressor Amps (L2) Compressor Amps (L3) MVS & MVW Installation & Operation Manual 10/2013 rev.3 Page C-2

28 Notes: MVS & MVW Installation & Operation Manual 10/2013 rev.3 Page C-3