WH Series. Installation, Operation & Maintenance. Horizontal Water-Source Heat Pump Unit WARNING WARNING QUALIFIED INSTALLER

Transcription

1 WH Series Horizontal Water-Source Heat Pump Unit Installation, Operation & Maintenance WARNING QUALIFIED INSTALLER WARNING If the information in this manual is not followed exactly, a fire may result causing property damage, personal injury, or loss of life. Improper installation, adjustment, alteration, service, or maintenance can cause property damage, personal injury or loss of life. Startup and service must be performed by a Factory Trained Service Technician. A copy of this IOM should be kept with the unit.

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3 Table of Contents AAON WSHP Series Features and Options Introduction... 6 Safety... 7 WSHP Series Feature String Nomenclature General Information Codes and Ordinances Receiving Unit Storage Direct Expansion (DX) Systems Wiring Diagrams Installation Locating the Unit Condensate Drain Piping Blower Assembly Removal Side Access Discharge modification Lifting and Handling the Unit Horizontal Unit Bottom Access Blower Assembly Removal Bottom Access Blower Motor and Fan Access Refrigerant-to-Water Heat Exchanger Water Piping Electrical Optional 4-Sided Air Filter Rack Set-up Duct Connection Waterside Economizer Startup Supply Fans Fan Air Flow Adjustment Filters Adjusting Refrigerant Charge AAON WSHP Pioneer Silver Controller AAON WSHP Pioneer Expansion Controller Operation Packaged DX Cooling Operation and Control Maintenance DX Cooling Condensate Drain Pans Supply Fans Microchannel Coil Cleaning Filter Replacement Replacement Parts AAON Warranty, Service, and Parts Department Filter Information Appendix A - Heat Exchanger Corrosion Resistance

4 Index of Tables and Figures Tables: Table 1- WSHP WV Series Clearances Table 2 - WSHP WH Series Clearances Table 3 - Glycol Freezing Points Table 4 - Condenser Water Connections Table 5 - Control Wiring Table 6 - Acceptable Refrigeration Circuit Values at AHRI ISO WLHP Conditions Table 7 - R-410A Refrigerant Temperature-Pressure Chart Table 8 - Led Diagnostic Codes Table 9 - Glycol Setpoints Table , 009, & 012 WH/WV Unit Series Filters (A Cabinet) Table , 018, 024, & 030 WH Series Unit Filters (B & C Cabinet) Table & 042 WH/WV Series Unit Filters (D Cabinet) Table & 060 WH Series Unit Filters (E Cabinet) Figures: Figure 1 Access Panels Figure 2 - Foam Shipping Block Figure 3 - Mounting Horizontal Units Figure 4 - Vibration Grommet Installation Figure 5 - Condensate Drain Piping Figure 6 - Drain Trap Figure 7 - WH Series Unit Orientation (Right Return Units Shown) Figure 8 - Blower Assembly with Captive Panel Figure 9 - Horizontal Unit Bottom Access Figure 10 - WH Bottom Access Panel Figure 11 - Shipping Screw Figure 12 - Spade Connectors Figure 13 - Filter access Doors Figure 14 - Close-Up of Pre-cut Aluminum Handle Figure 15 - Pre-cut Aluminum Handles bent to 90 degrees Figure 16 - Filter Pull Figure 17 - Fastener Clip Figure 18 - Removing Filter Access Doors Figure 19 Using the Filter Pull Figure 20- Keeper Tabs Figure 21 - Filter Access Doors at 45 degree angle Figure 22 - WSHP Series Supply Fan Figure 23 Pioneer Silver Layout V81280 Rev. A

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6 AAON WSHP Series Features and Options Introduction Energy Efficiency Direct Drive Forward Curved Supply Fan Scroll or Rotary Compressor Neoprene Foam or 1 Foil Faced Cotton Fiber Cabinet Insulation Waterside Economizer with 3-Way Motorized Valve Electronically Commutated Motors or Permanent Split Capacitor Motors Copper Coaxial Heat Exchanger or Cupronickel Coaxial Refrigerant-to- Water-Heat Exchanger Microchannel Air Coils Indoor Air Quality Multiple High Efficiency Filters up to MERV 14 Rating Stainless Steel Drain Pan Neoprene Foam Cabinet Insulation Humidity Control ECM Fan Speed Dehumidification Hot Gas Reheat Dehumidification Controls 5 Wire Thermostat Control Installation and Maintenance Bottom Service Access Color-Coded Wiring and Wiring Diagram Non-fused Service Disconnect System Integration Waterside Economizer Hot Gas Reheat Humidity Control Environmentally Friendly R-410A Refrigerant Recyclable Sheet Metal Shipping Pallet Extended Life Induction Brazing Aluminum Cabinet Stainless Steel Drain Pans Cupronickel Coaxial Refrigerant-to- Water Heat Exchanger Microchannel Air Coil Sound Control Sound Absorbing Cabinet Insulation Compressors mounted with rubber-inshear isolators on an isolation plate with rubber-in-shear isolation to the cabinet Sound Absorbing Blower Insulation Compressor Sound Blanket 6

7 Safety Attention should be paid to the following statements: NOTE - Notes are intended to clarify the unit installation, operation and maintenance. CAUTION - Caution statements are given to prevent actions that may result in equipment damage, property damage, or personal injury. WARNING - Warning statements are given to prevent actions that could result in equipment damage, property damage, personal injury or death. CAUTION Rotation must be checked on all COMPRESSORS AND MOTORS of 3 phase units at startup by a qualified service technician. Scroll compressors are directional and can be damaged if rotated in the wrong direction. Compressor rotation must be checked for proper operation, without using external refrigerant pressure gauges. Often, a compressor running in reverse rotation will be much louder than a normal compressor, and will not develop much of a temperature differential between the suction and discharge lines. Fan motor rotation should also be checked for proper operation. Alterations should only be made at the unit power connection. CAUTION To prevent damage to the unit, do not use acidic chemical coil cleaners. Do not use alkaline chemical coil cleaners with a ph value greater than 8.5, after mixing, without first using an aluminum corrosion inhibitor in the cleaning solution. CAUTION Cleaning the cooling tower or the condenser water loop with harsh chemicals, such as hydrochloric acid (muriatic acid) or chlorine, can damage the water-cooled condenser. Care should be taken to avoid allowing chemicals to enter the water-cooled condenser. See Appendix A - Heat Exchanger Corrosion Resistance for more information. CAUTION PVC (Polyvinyl Chloride) and CPVC (Chlorinated Polyvinyl Chloride) are vulnerable to attack by certain chemicals. Polyolester (POE) oils used with R-410A and other refrigerants, even in trace amounts, in a PVC or CPVC piping system will result in stress cracking of the piping and fittings and complete piping system failure. 7

8 WARNING OPEN LOOP APPLICATIONS Failure of the condenser as a result of chemical corrosion is excluded from coverage under AAON Inc. warranties and the heat exchanger manufacturer s warranties. WARNING Some chemical coil cleaning compounds are caustic or toxic. Use these substances only in accordance with the manufacturer s usage instructions. Failure to follow instructions may result in equipment damage, injury or death. WARNING Do not work in a closed area where refrigerant or nitrogen gases may be leaking. A sufficient quantity of vapors may be present and cause injury or death. WARNING UNIT HANDLING To prevent injury or death lifting equipment capacity shall exceed unit weight by an adequate safety factor. Always test-lift unit not more than 24 inches high to verify proper center of gravity lift point to avoid unit damage, injury or death. WARNING ELECTRIC SHOCK AND FIRE HAZARD Failure to follow safety warnings exactly could result in dangerous operation, serious injury, death or property damage. Improper servicing could result in dangerous operation, serious injury, death, or property damage. Before servicing, disconnect all electrical power to the unit to avoid shock hazard or injury from rotating parts. Follow proper Lockout-Tagout procedures. When servicing controls, label all wires prior to disconnecting. Reconnect wires correctly. Verify proper operation after servicing. Secure all service panels. WARNING GROUNDING REQUIRED All field installed wiring must be completed by qualified personnel. Field installed wiring must comply with NEC/CEC, local and state electrical code requirements. Failure to follow code requirements could result in serious injury or death. Provide proper unit ground in accordance with these code requirements. 8

9 WARNING During installation, testing, servicing and troubleshooting of the equipment it may be necessary to work with live electrical components. Only a qualified licensed electrician or individual properly trained in handling live electrical components shall perform these tasks. Standard NFPA-70E, an OSHA regulation requiring an Arc Flash Boundary to be field established and marked for identification of where appropriate Personal Protective Equipment (PPE) be worn, should be followed. WARNING ROTATING COMPONENTS Unit contains fans with moving parts that can cause serious injury. Do not remove panel containing fans until the power to the unit has been disconnected and fan has stopped rotating. WARNING WATER FREEZING Failure of the condenser due to freezing will allow water to enter the refrigerant circuit and will cause extensive damage to the refrigerant circuit components. Any damage to the equipment as a result of water freezing in the condenser is excluded from coverage under AAON warranties and the heat exchanger manufacturer warranties. WARNING WATER PRESSURE Prior to connection of condensing water supply, verify water pressure is less than maximum pressure shown on unit nameplate. To prevent injury or death due to instantaneous release of high pressure water, relief valves should be field supplied on system water piping. 1. READ THE ENTIRE INSTALLATION, OPERATION AND MAINTENANCE MANUAL. OTHER IMPORTANT SAFETY PRECAUTIONS ARE PROVIDED THROUGHOUT THIS MANUAL. 2. Startup and service must be performed by a Factory Trained Service Technician. 3. The unit is for indoor use only. See General Information section for more unit information. 4. Every unit has a unique equipment nameplate with electrical, operational, and unit clearance specifications. Always refer to the unit nameplate for specific ratings unique to the model you have purchased. 9

10 WSHP Series Feature String Nomenclature Unit Configuration : Accessory Options Gen Major Rev Size Series Minor Rev Voltage Eff. Level Comp Level Loop Type Coil Type Heat Type Heat Staging 1 2 3A 3B 4 5 6A 6B WH A C : A MODEL OPTIONS Generation and Orientation WH = Horizontal Water-Source Heat Pump Major Revision A Unit Size 006 = 6,000 Btu/hr = ½ ton 009 = 9,000 Btu/hr = ¾ ton 012 = 12,000 Btu/hr = 1 ton 015 = 15,000 Btu/hr = 1 ¼ ton 018 = 18,000 Btu/hr = 1 ½ ton 024 = 24,000 Btu/hr = 2 ton 030 = 30,000 Btu/hr = 2 ½ ton 036 = 36, 000 Btu/hr = 3 ton 042 = 42,000 Btu/hr = 3 ½ ton 048 = 48,000 Btu/hr = 4 ton 060 = 60,000 Btu/hr = 5 ton Series A = A Cabinet (006, 009 & 012) B = B Cabinet (015 & 018) C = C Cabinet (024 & 030) D = D Cabinet (036 & 042) E = E Cabinet (048 & 060) Minor Revision 0 = Minor Revision 0 Voltage 3 = 460V/3Φ/60Hz 4 = 575V/3Φ/60Hz A = 265V/1Φ/60Hz B = 115V/1Φ/60Hz C = V/1Φ/60Hz D = V/3Φ/60Hz Efficiency Level 1 = Std Efficiency Compact Box with PSC Motor 2 = Std Efficiency Compact Box with ECM Motor Compressor Style 0 = R-410A On/Off Compressor - Heat Pump Loop Type 0 = Water Loop (Cooling Tower Only, EWT 60 F) A = Ground Loop Application B = Ground Water Application Coil Type 0 = Copper Coaxial Refrigerant-to-Water Heat Exchanger + Microchannel Air Coil B = Cupronickel Coaxial Refrigerant-to-Water Heat Exchanger + Microchannel Air Coil Heat Type 0 = No Heating Heating Staging 0 = No Heating 1: Unit Orientation 0 = Right Hand Return + Left Hand Supply A = Right Hand Return + End Supply B = Left Hand Return + Right Hand Supply C = Left Hand Return + End Supply 2: Supply Fan 0 = Standard Fan + PSC Motor A = Standard Fan + ECM Motor 10

11 WSHP Series Feature String Nomenclature Unit Configuration : Accessory Options Gen Major Rev Size Series Minor Rev Voltage Eff. Level Comp Level Loop Type Coil Type Heat Type Heat Staging 1 2 3A 3B 4 5 6A 6B WH A C : A A: Filter Rack *0 = Open Return Slide-Out Filter Rack A = 4-Sided 2 Filter Rack - Return Duct Flange and Access Panel B = 4-Sided 2 Filter Rack + High MERV Filter Seal - Return Duct Flange and Access Panel C = 4-Sided 4 Filter Rack + High MERV Filter Seal - Return Duct Flange and Access Panel D = 4-Sided 1 Filter Rack + Access Panel - Return Duct Flange and Access Panel E = 4-Sided 1 Filter Rack + High MERV Filter Seal - Return Duct Flange and Access Panel 3B: Filters 0 = No Filter A = 2 MERV 8 Filter B = 4 MERV 11 Filter C = 4 MERV 13 Filter D = 4 MERV 14 Filter E = 1 MERV 8 Filter F = 1 MERV 11 Filter G = 1 MERV 13 Filter 4: Refrigeration and Dehumidification Options 0 = Standard A = ECM Fan Speed Dehumidification B = On/Off Hot Gas Reheat Dehumidification 5: Service Disconnect 0 = Standard - None A = Non-Fused Service Disconnect 6A: Control Sequence 0 = Terminal Block for Thermostat + Pioneer Silver Controller A = Terminal Block for Thermostat + Pioneer Silver Controller + Expansion Board 6B: Control Options 0 = Standard No Communication * 1 Filter Rack for A Cabinets Only 2 Filter Rack for B, C, D, & E Cabinets 7: Cabinet Options B = Closed Cell Neoprene Foam Cabinet Insulation + SS Drain Pan C = Low Sound Package Neoprene Foam Cabinet and Blower Insulation + Compressor Sound Blanket + SS Drain Pan 0 = 1 Foil Face Cotton Fiber Cabinet Insulation + SS Drain Pan A = Low Sound Package 1 Foil Face Cotton Fiber Cabinet and Blower Insulation + Compressor Sound Blanket + SS Drain Pan 8: WSE 0 = Standard - None B = Waterside Economizer + 3-Way Motorized Valve 9: Blank 0 = Standard - None 10: Blank 0 = Standard - None 11: Code Options 0 = Standard - ETL USA Listing B = ETL USA + Canada Listing 12: Shipping Options 0 = Standard - Sheet Metal Pallet with Forklift Slots and Shrink Wrap 13: Blank 0 = Standard - None 14: Blank 0 = Standard - None 15: Blank 0 = Standard - None 16: Cabinet & Specials 0 = All Aluminum Cabinet Construction 11

12 General Information WSHP Series units have been designed for indoor installation only. Units are assembled, wired, charged and run-tested at the factory. WARNING Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life. Startup and service must be performed by a Factory Trained Service Technician. A copy of this IOM should be kept with the unit. CAUTION These units must not be used as a construction heater at anytime during any phase of construction. Very low return air temperatures, harmful vapors, and misplacement of the filters can damage the unit and its efficiency. Certification of Cooling Models a. Certified as a commercial central air conditioner with electrically operated compressors. b. Certified for indoor installation only. c. Certified with refrigerant R-410A coils. Codes and Ordinances WSHP Series units have been tested and certified, by ETL, in accordance with UL Safety Standard 1995/CSA C22.2 No System should be sized in accordance with the American Society of Heating, Refrigeration and Air Conditioning Engineers Handbook. Installation of units must conform to the ICC standards of the International Mechanical Code, the International Building Code, Installation of Air Conditioning and Ventilating Systems Standard, NFPA 90A, and local building, plumbing and waste water codes. All appliances must be electrically grounded in accordance with local codes, or in the absence of local codes, the current National Electric Code, ANSI/NFPA 70 or the current Canadian Electrical Code CSA C22.1. CAUTION The Clean Air Act of 1990 bans the intentional venting of refrigerant as of July 1, Approved methods of recovery, recycling, or reclaiming must be followed. WARNING Coils and sheet metal surfaces present sharp edges and care must be taken when working with equipment. 12

13 WARNING Failure to observe the following instructions will result in premature failure of your system and possible voiding of the warranty. Receiving Unit When received, the unit should be checked for damage that might have occurred in transit. If damage is found it should be noted on the carrier s Freight Bill. A request for inspection by carrier s agent should be made in writing at once. All units are shrink-wrapped in blue wrap. If a unit shows up with any other color wrap, the unit has been opened and it should be thoroughly checked for damage which necessitated re-wrapping. Nameplate should be checked to ensure the correct model sizes and voltages have been received to match the job requirements. If repairs must be made to damaged goods, then the factory should be notified before any repair action is taken in order to protect the warranty. Certain equipment alteration, repair, and manipulation of equipment without the manufacturer s consent may void the product warranty. Contact the AAON Warranty Department for assistance with handling damaged goods, repairs, and freight claims: (918) Note: Upon receipt check shipment for items that ship loose. Consult order and shipment documentation to identify potential loose-shipped items. Figure 1 Access Panels Storage If installation will not occur immediately following delivery, store equipment in a dry protected area away from construction traffic and in the proper orientation as marked on the packaging with all internal packaging in place. Secure all loose-shipped items. Direct Expansion (DX) Systems All systems are factory assembled, leak tested, charged with R-410A refrigerant, and run tested. All systems include air coil, reversing valve, liquid line filter dryer, thermal expansion valve (TXV), and compressors. Never turn off the main power supply to the unit, except for servicing, emergency, or complete shutdown of the unit. Always control the unit from the thermostat, or control panel, never at the main power supply, except for emergency or complete shutdown of the unit. The warranty card must be completed in full and returned to AAON not more than 3 months after unit is delivered. 13

14 During the cooling season, if the air flow is reduced due to dirty air filters or any other reason, the cooling coils can get too cold which can cause excessive liquid to return to the compressor. As the liquid concentration builds up, oil is washed out of the compressor, leaving it starved for lubrication. The compressor life will be seriously shortened by reduced lubrication and the pumping of excessive amounts of liquid oil and refrigerant. Wiring Diagrams Unit specific wiring diagrams are affixed inside the controls compartment panel. Use flexible gasket material to seal the duct to the unit. Verify ceiling, floor, or foundation can support the total unit weight, including accessory weights. To properly support the horizontal WSHP unit and reduce noise and vibration, it must be mounted level in both horizontal directions. These units are designed to be suspended via threaded rod (field provided) through all four hanger brackets using the four (4) vibration grommets and 3/8 washers provided and as shown in Figure 3. Installation AAON equipment has been designed for quick and easy installation. (Note: Remove the large foam shipping block that supports the blower assembly before installation, or damage may occur.) Vibration Grommet 3/8 Washer Threaded Rod (Field Provided) Nut (Field Provided) Figure 3 - Mounting Horizontal Units Figure 2 - Foam Shipping Block Caution should be taken to assure the top of the vibration grommet is inserted into (or through) the hole provided in the hanger bracket, as pointed out in Figure 4. Locating the Unit Placement of the unit relative to ductwork, electrical and plumbing must be carefully considered. Return air plenum or duct can be mounted directly to the return air flanges. 14

15 CAUTION Emergency drain pan is recommended for all applications where a risk of water damage to surrounding structure or furnishings. Refer to local codes. Figure 4 - Vibration Grommet Installation The threaded rod and nut should be adequately sized to support the total unit weight. Care should be taken to avoid installing units directly above or adjacent to noise-sensitive areas. Note: Only the required supply and/or return air ducts should be supported by or from the horizontal WSHP unit. Allow adequate service clearances as shown on the unit nameplate and unit drawing. Consult your local building codes for additional service clearance requirements. Allow adequate space for piping access and panel removal. Condenser water piping is on the compressor end and condensate drain connections are located on the opposite end. Floor Mounted Units Make sure the unit is level and mounted on a field supplied platform with a minimum height to allow for proper depth of the condensate line p-trap. Other installation provisions may be necessary according to job specifications. It is recommended that a vibration isolation pad be used when floor mounting a unit Condensate Drain Piping A p-trap and drain line must be installed on horizontal units, with the p-trap not to exceed 6 from the drain connection. The lines should be the same pipe size or larger as/than the drain connection and pitch downward toward drain. An air break should be used with long runs of condensate lines. (Note: Horizontal units require a p-trap that is field installed. CAUTION Unit should not be operated without p-traps. Failure to install a p-trap may result in overflow of condensate water. Condensate Drain Figure 5 - Condensate Drain Piping 15

16 Draw-through cooling coils will have a negative static pressure in the drain pan area. This will cause an un-trapped drain to back up due to air being pulled up through the condensate drain piping. Condensate drain trapping and piping should conform to all applicable governing codes. Note: The drain pan connection(s) is an unthreaded 7/8 stainless steel pipe stub. 2" 1" Figure 6 - Drain Trap The total height from the trap inlet to the top of the bottom bend of the trap must be 2 minimum. The height from top of the bottom bend of the trap to the bottom of the leaving pipe must be at least equal to 1. This ensures that enough water is stored in the trap to prevent losing the drain seal during unit startup Table 1- WSHP WV Series Clearances Minimum Clearances Required Capacity Front/Control Panel Air Intake 006, 009, ,

17 Capacity Table 2 - WSHP WH Series Clearances Minimum Clearances Required Front/Control Panel Back (Optional) Air Intake *Bottom 006, 009, , , , , , *Note: If bottom access is not available, optional dimensions become required. Straight Discharge Water Connections Air Intake (Filters) End Discharge End Discharge (Optional) Air Intake (Filters) Straight Discharge Figure 7 - WH Series Unit Orientation (Right Return Units Shown) 17

18 Blower Assembly Removal Side Access 1) Using a ¼ socket drive, remove the shipping screw on the outside of the right or discharge side of the unit as shown in the figure below. Figure 8 - Blower Assembly with Captive Panel 2) Remove the side blower access panel using the panel handle and lift the panel upwards about ½ or until it clears the captive panel at the bottom of the blower panel. 5) Pull the lower half of the blower mount, away from the blower panel about 10 degrees. Handle 3) Pull the bottom of the blower panel out about 10 degrees then down and away from the unit 4) Grip the blower assembly with both hands and lift it about ½ or until it clears the captive panel at the assembly. 6) Once the blower assembly is clear of the blower panel, turn the blower assembly, 90 degrees, counter clockwise. (Caution: At any time, DO NOT rest blower assembly on bottom access panel, as damage may occur to the unit) 18

19 7) Pull the blower assembly out of the unit. 2) Firmly grip the blower panel and lift it approximately ½ or until the bottom of the blower panel clears the WSHP unit. 3) Pull the bottom of the blower panel out about 10 degrees then down and away from the unit. Discharge modification The AAON WSHP discharge direction can be selected in ECat and is also designed so that the discharge direction can be field modified if needed. (Note: DO NOT perform this action while unit is hanging. It MUST be done on a solid working surface. Otherwise, serious unit damage may occur) Remove the blower assembly as outlined in the Blower Assembly Removal Side Access section before modifying the discharge. 4) Remove the side access panel as shown in the Blower Assembly Removal Side Access section, step 2. 5) Swap the two panels keeping note of which side is up. (Note: Installing blower panel upside down will result in damage to the unit.) Once complete, proceed to the following: 1) Use a ¼ socket to remove the four (4) screws holding the blower panel in place. Ensure both the blower panel and side access panels are installed correctly as 19

20 outlined in the Blower Assembly Removal Side Access section. Lifting and Handling the Unit Before lifting unit, be sure that all shipping material has been removed from unit. To access the bottom panel, use a *flat* head screw driver to remove the screws that hold the panel in place; WARNING UNIT HANDLING Incorrect lifting can cause damage to the unit, injury or death. Lifting equipment capacity should exceed unit weight by an adequate safety factor. Always test lift unit not more than 24 inches high to verify proper center of gravity lift point. Horizontal Unit Bottom Access Several components are accessible through the bottom access panel of the WSHP unit. Accessible components include: Blower housing, blower motor, TXV, reversing valve, and filter drier. In order to eliminate door stress as these screws are removed, start with the ones closest to the hinged side of the cover. Note: The nuts will remain captive within the unit. After the screws are removed, the bottom access panel will drop or swing down and remain attached to the unit as shown in Figure 10. Figure 9 - Horizontal Unit Bottom Access In order for the unit to be bottom accessible, adequate bottom clearance is needed. Bottom clearance required for the unit can be found on Table 2 WSHP Series Clearances. Figure 10 - WH Bottom Access Panel While leaving the bottom access panel in this position is acceptable for most service / maintenance conditions, occasionally it will be necessary for the panel to be completely removed. 20

21 To do this, grasp both sides of the panel and using a moderate amount of force, pull the compressor side of the panel, approximately 30 degrees, towards the opposite side of the unit. Figure 11 - Shipping Screw 2) Open the bottom access panel section as described in the Blower Assembly Removal Side Access, steps 3 and 4. At this point, the end that was just pulled will be low enough to clear the bottom access hole and slide the panel out of the unit. 3) Remove the five (5) spade connectors on the blower motor as shown in Figure 12. Figure 12 - Spade Connectors Blower Assembly Removal Bottom Access 1) Using a ¼ socket drive, remove the shipping screw on the outside of the right or discharge side of the unit as shown in Figure 11. 4) Firmly grip the blower assembly with both hands and push it upwards about ½ or until it clears the captive panel at the bottom of the blower panel. 5) Pull the lower half of the blower mount, away from the blower panel (about 10 degrees). 21

22 6) Once the blower assembly is clear of the blower panel, firmly pull the blower assembly down and away from the unit. 2) Pull the motor and blower up and out of the blower assembly. Blower Motor and Fan Access To access the blower motor and fan, first remove the blower assembly as outlined in the appropriate Blower Assembly Removal for your unit. Once the blower assembly is on a working surface: 3) Separate the motor from the blower sub assembly, place the sub assembly (motor side up) and remove the set screw as shown below. 1) Remove the five (5) screws that secure the blower motor to the blower assembly. 4) The blower can now be separated from the motor. 22

23 Refrigerant-to-Water Heat Exchanger Water Piping Open Loop Applications This product contains refrigerant-to-water heat exchanger made of cupronickel or copper and is subject to severe corrosion and failure when exposed to chlorides. WARNING OPEN LOOP APPLICATIONS Failure of the condenser as a result of chemical corrosion is excluded from coverage under AAON Inc. warranties and the heat exchanger manufacturer s warranties. Do not allow water containing any form of chlorides to enter this heat exchanger. Common forms of chlorides include: 1. Sea water mist entering an open cooling tower system. 2. Contaminated make-up water containing salt water. 3. Water loop systems that have been disinfected. Chlorides will result in a premature failure of the condenser. Failure of the condenser as a result of chemical corrosion is excluded from coverage under AAON warranties and the heat exchanger manufacturer warranties. Failure of the condenser may allow water to enter the refrigerant circuit and may cause extensive damage to the refrigerant circuit components. Any damage to the equipment as a result of condenser failure from chemical corrosion due the fluid in the condenser is excluded from coverage under AAON warranties and the heat exchanger manufacturer warranties. WARNING OPEN LOOP APPLICATIONS Cupronickel refrigerant-to-water heat exchangers are recommended with all open loop applications. Failure to use a Cupronickel heat exchanger may result in premature failure of your system and possible voiding of the warranty. CAUTION Cleaning the cooling tower or condenser water loop with harsh chemicals such as hydrochloric acid (muriatic acid), chlorine or other chlorides, can damage the refrigerant-to-water heat exchanger. Care should be taken to avoid allowing chemicals to enter the refrigerant-to-water heat exchanger. See Appendix A - Heat Exchanger Corrosion Resistance for more information. Freezing Water in the Heat Exchanger This product contains one refrigerant-towater heat exchanger. A refrigerant-to-water heat exchanger contains refrigerant in one passage and water in another passage. Water is subject to freezing at 32 F. When water freezes in a heat exchanger significant forces are exerted on the components of the heat exchanger where the water is confined. Failure of the condenser due to freezing will allow water to enter the refrigerant circuit and will cause extensive damage to the refrigerant circuit components. Any damage to the equipment as a result of water 23

24 freezing in the condenser is excluded from coverage under AAON warranties and the heat exchanger manufacturer warranties. WARNING WATER FREEZING Failure of the condenser due to freezing will allow water to enter the refrigerant circuit and will cause extensive damage to the refrigerant circuit components. Any damage to the equipment as a result of water freezing in the condenser is excluded from coverage under AAON warranties and the heat exchanger manufacturer warranties. Unit is capable of operating with Entering Water Temperatures (EWT) as low as 57 F during cooling mode without the need for an automatic flow regulating water valve. If the EWT is expected to be lower than 57 F or more stable operation is desired, an automatic flow regulating water valve should be installed. Glycol solution should be used if ambient temperatures are expected to fall below freezing or if the loop water temperature is below 50 F while operating in the heating mode (heat pump units only). Adding glycol to condenser water causes an increase in pressure drop resulting in a decrease in unit performance. A minimum concentration of 20% glycol solution is recommended. The unit controller contains dip switches to set the loop glycol percentage. Set the glycol percentage to the closest option available, rounding down if needed. The option selected will reset the Leaving Water Temperature safety for the unit. AAON will not be responsible for frozen coaxial coils due to improper selection of glycol percentage. See Leaving Water Temperature Alarm section for more details. Table 3 - Glycol Freezing Points % Glycol Ethylene Glycol Propylene Glycol F 19 F 30 7 F 9 F 40-7 F -6 F F -27 F Water loop piping runs through unheated areas or outside the building should be insulated. Water Piping WARNING WATER PRESSURE Prior to connection of condensing water supply, verify water pressure is less than maximum pressure shown on unit nameplate. To prevent injury or death due to instantaneous release of high pressure water, drain valves should be field supplied on water piping. Supply water connection may require a backflow preventer to prevent supply makeup water from backing up into the public water system. CAUTION PVC (Polyvinyl Chloride) and CPVC (Chlorinated Polyvinyl Chloride) are vulnerable to attack by certain chemicals. Polyolester (POE) oils used with R-410A and other refrigerants, even in trace amounts, in a PVC or CPVC piping system will result in stress cracking of the piping and fittings and complete piping system failure. 24

25 Only use approved water pipe material. Avoid using galvanized material for water lines/fittings. Table 4 - Condenser Water Connections Supply and Return Model (WHA-) Connection Size (in. FPT) 006, 009, 012, 015, 018, 1/ , 036, 042, & 048 3/ Condenser water pump must be field sized and installed between the cooling tower or geothermal wellfield and self-contained unit. System should be sized in accordance with the ASHRAE Handbook. Use engineering guidelines to maintain equal distances for supply and return piping and limit bend radiuses to maintain balance in the system. Balancing valves, permanent thermometers and gauges may be required. CAUTION Installing contractor is responsible for properly sizing and installing water system components. Improper fluid flow due to valves, piping, or improper pump operation may result in unacceptable unit operation and void warranty. CAUTION WATER PIPING Follow national and local codes when installing water piping. Connections to the unit should incorporate vibration eliminators to reduce noise and vibration and shutoff valves to facilitate servicing. Supply and return water piping must be at least as large as the unit connections and larger depending on length of runs, rise and bends. Before connection to the unit, the condenser water system should be flushed to remove foreign material that could cause condenser fouling. Install a screen strainer with a minimum of 20 Mesh ahead of the condenser inlet to prevent condenser fouling and internal tube damage. Mineral content of the condenser water must be controlled. All make-up water has minerals in it and as the water is evaporated in the cooling tower, these minerals remain. As the mineral content of the water increases, the conductivity of the water increases. A bleedoff (drain valve) must be provided for the condenser water loop. Field provided and installed water treatment program must be compatible with stainless steel, copper, aluminum, ABS plastic, and PVC. Batch feed processes should never be used as concentrated chemicals can cause corrosion. Never use hydrochloric acid (muriatic acid) or chlorine as it will corrode stainless steel. Water loop piping runs through unheated areas or outside the building should be insulated. 25

26 NOTE: Ball valves should be installed in the condenser water supply and return lines for unit isolation and water flow balancing. All manual flow valves should be of the ball valve design. Globe or gate valves should not be used due to high pressure drops and poor throttling characteristics. Pressure and temperature ports are recommended in condenser water supply and return lines for system balancing. These openings should be 5 to 10 pipe diameters from the unit water connections. To allow for mixing and temperature stabilization, wells in the water piping should extend at least ½ pipe diameter into the pipe. Piping systems should not exceed 10 ft/sec fluid velocity to ensure tube wall integrity and reduce noise. Electrical Verify the unit nameplate agrees with power supply. WSHP Series units are provided with single point power wiring connections. A complete set of unit specific wiring diagrams, showing factory and field wiring are located inside the controls compartment panel. Note: All units are factory wired for either 208V/230V, 265V, 460V, or 575V. The transformer configuration must be checked by a qualified technician prior to service, especially if unit is to be connected to a 208V or 230V supply. Note: All our units are default wired to 208V for the 208V/230V option. To utilize 230V service, interchange the yellow and red wire terminals from the transformer. Red-Black for 208V Yellow-Black for 230V WARNING Disconnect all electrical power sources before servicing the unit. More than one power source may be provided. Failure to do so may result in injury or death from electrical shock or entanglement in moving parts. All units require field supplied electrical overcurrent and short circuit protection. Device must not be sized larger than the Maximum Overcurrent Protection (MOP) shown on the unit nameplate. Codes may require a disconnect switch be within sight of the unit. A unit-mounted disconnect switch is available as an option. It is important to note that this is a method for convenient maintenance of the unit, but does not provide unit protection or isolation. Electrical supply can enter through the side of the controls compartment where knockouts and/or capped pre-cut holes have been provided. Horizontal units have been provided with both high and low voltage holes at the top and bottom of the unit. Entry must be made into one each of these locations. A single point connection to a definite purpose contactor is provided on the control panel, or to the unit-mounted disconnect switch (if installed) on the corner panel. High voltage conductors should enter the control panel in a separate opening and separate conduit than 24V low voltage conductors. High voltage and low voltage openings are nominally sized at 1-1/8 and 7/8 respectively. 26

27 Note: Alternate locations for field cut electrical entries must be approved by AAON factory. CAUTION Installing Contractor is responsible for proper sealing of the electrical entries into the unit. Failure to seal the entries may result in damage to the unit and property. Size supply conductors based on the unit Minimum Current Ampacity (MCA) rating. Supply conductors must be rated a minimum of 75 C. Protect the branch circuit in accordance with code requirements. The unit must be electrically grounded in accordance with local codes, or in the absence of local codes, the current National Electric Code, ANSI/NFPA 70 or the current Canadian Electrical Code CSA C22.1. Wire power leads to the unit s contactor or main disconnect. All wiring beyond this point has been completed by AAON and cannot be modified without effecting the unit s agency/safety certification. Supply voltage must be within the min/max range shown on the unit nameplate. Available short circuit current should not exceed the short circuit current rating (SCCR) shown on the unit nameplate. CAUTION Three phase voltage imbalance will cause motor overheating and premature failure. voltage divided by the average voltage. The maximum allowable imbalance is 2.0%. Example: (221V+230V+227V)/3 = 226V, then 100*(226V-221V)/226V = 2.2%, which exceeds the allowable imbalance. Check voltage imbalance at the unit disconnect switch and at the compressor terminal. Contact your local power company for line voltage corrections. Installing contractor must check for proper motor rotation and check blower motor amperage listed on the motor nameplate is not exceeded. CAUTION Rotation must be checked on all MOTORS AND COMPRESSORS of three phase units. Supply fan motors should all be checked by a qualified service technician at startup and any wiring alteration should only be made at the unit power connection. Wire control signals to the unit s low voltage thermostat connections on the control board, located in the controls compartment. Consult unit wiring diagram for more detailed instructions on control signal wiring connections. If any factory installed wiring must be replaced, use a minimum 105 C type AWM insulated conductors. Voltage imbalance is defined as 100 times the maximum deviation from the average 27

28 CAUTION Scroll compressors are directional and will be damaged by operation in the wrong direction. Rotation should be checked by a qualified service technician at startup using suction and discharge pressure gauges and any wiring alteration should only be made at the unit power connection. Thermostat Control Wiring If a thermostat is used for unit control, thermostat should be located on an inside wall 4-5 feet above the floor where it will not be subjected to drafts, sun exposure, or heat from electrical fixtures or appliances. Control wiring must deliver adequate voltage to components to assure proper operation. Control voltage returning from controller circuit must be a minimum of 21 VAC. To assure proper wiring use the following chart to determine the allowable wiring distances. connectors is less than 21 VAC, isolation relays must be installed. If under external control 21 VAC must be field verified. All external devices must be powered via a separate external power supply. Example: A total of 5 wires must be pulled 75ft to a control the unit. What size wire should be used? According to Table 5, 18 AWG allows for 70ft (350 ft. /5 wires) and 16 AWG allows for 100ft (500 ft. /5 wires). Thus, 16 AWG should be used. 28 Table 5 - Control Wiring Wire Size (Stranded) - Copper Conductors Only 20 AWG 200 ft 18 AWG 350 ft 16 AWG 500 ft 14 AWG 750 ft 12 AWG 1250 ft Total Wire Distance Allowable = (Quantity of Control Wires) x (Control Wire Distance) Total Wire Distance Allowable Take the total wire distance allowable and divide by the number of wires to be connected. This indicates the distance allowable for that size wire. The wiring to the unit must not exceed the total wire distance allowable. If the voltage at the

29 Optional 4-Sided Air Filter Rack Set-up The access door handles and filter pull must be set-up prior to installing or changing the filters. Figure 13 - Filter access Doors Filter Access Door Handles Set-up 1. Locate the pre-cut aluminum handles in both the bottom and side filter access doors. amount of force, bend the handle away from the unit. Bend just enough to grab ahold of it with your fingers and continue to bend the handle, approximately 90 degrees, as shown in Figure 15. Figure 14 - Close-Up of Pre-cut Aluminum Handle Using a blade screw driver, insert the tip of the screw driver into the top of the door handle and with a moderate Figure 15 - Pre-cut Aluminum Handles bent to 90 degrees 29

30 Note: Caution should be given not to over bend handles, as this may fracture or break the material. 2. Repeat this process on all access door handles. Filter Pull Set-up Each unit has a filter pull located in the filter section of the unit. 1. A decision must now be made and it is as follows: Note: The fastener clip will remain captive in the filter frame access door to streamline filter maintenance and prevent hardware loss. 3. Grasping both filter frame access handles, swing the door open, approximately 45 degrees and lift off of the keeper tabs, as shown in Figure 18 Lift Figure 18 - Removing Filter Access Doors Figure 16 - Filter Pull a. If side access to the filters is desired, then no further action is required. b. If bottom access to the filters is desired, then continue to step 2. Note: Do not bend keeper tabs, as this may prevent the filters from sealing properly. 2. The filter pull is located in the filter area as shown in Figure 16. From the SIDE filter access door, insert the tip of the Philips head screw driver into the fastener clip and turn it ¼ turn CCW. While holding the screw CCW, grasp the nearest filter access door handle and with a moderate amount of force, pull the fastener clip until it is free. Figure 19 Using the Filter Pull Figure 17 - Fastener Clip 4. The filter pull is now accessible. Grasp the filter pull and lift it approximately ¼ and with moderate force, pull it out and away from the unit. 30

31 Note: Caution should be given that filters are clear of access holes so that filter damage does not occur. See Figure Because the filter pull may be longer than available room, it may be necessary to roll, bend or cut the slide to be completely removed. 6. Reinstall the filters, taking note of correct orientation with regard to airflow. 7. Mount the filter access door back by aligning the keeper tabs with the slots in the access door at about a 45-degree angle. Insert the tabs into the slots making sure not to bend the tabs. firmly until the fastener is locked into position as shown in Figure 15. Duct Connection Attach duct to flanges provided on the unit. The installer is responsible for sealing ducts to the flanges to prevent air leaks. Intake air enters the side of the WH/WV Series units, where the air filters are located. The left or right hand return depends on feature selected when ordering the units. Ductwork should be sized in accordance with the ASHRAE Handbook. Ductwork should be installed in accordance with NFPA Standard 90A. When attaching duct to the unit, use a flexible/compressible material rated for duct connections. A three inch flexible connector for both return and supply duct connections is recommended. Figure 20- Keeper Tabs Waterside Economizer Cooling and pre-cooling waterside economizer coil is factory installed upstream of the evaporator coil. Factory tested and installed water piping kit includes an on/off waterside economizer valve. The waterside economizer circuit operates in either WSE or Mechanical Cooling only modes. Figure 21 - Filter Access Doors at 45 degree angle. 8. Close the filter access door and using your thumb, press the fastener clip into the fastener captive slot and press During waterside economizer only mode of operation condenser water is 100% diverted through the waterside economizer coil via an internal 3-way valve. During mechanical cooling only mode of operation condenser water flows around the waterside economizer coil with the waterside economizer valve fully closed. The condenser water passes only through the water-cooled condenser. 31

32 Waterside economizer coil condensate drains into evaporator coil drain pan. See the previous section on evaporator coil condensate drain piping. Mineral content of the condenser water must be controlled. All make-up water has minerals in it and as the water is evaporated in the cooling tower, these minerals remain. As the mineral content of the water increases, the conductivity of the water increases. Field provided and installed water treatment program must be compatible with stainless steel, copper, aluminum, ABS plastic, and PVC. Batch feed processes should never be used as concentrated chemicals can cause corrosion. Never use hydrochloric acid (muriatic acid) or chlorine as it will corrode stainless steel. Units with a waterside economizer coil require the Pioneer Expansion Board or the Pioneer Gold controller. The entering water temperature is monitored by the control board. Changeover temperature to activate waterside economizer operation is configurable between F (all 1 increments) via dip switches (Pioneer Expansion Board) or programming menus (Pioneer Gold). Startup (See back of the manual for startup form) WARNING Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life. Startup and service must be performed by a Factory Trained Service Technician. A copy of this IOM should be kept with the unit. WARNING Electric shock hazard. Shut off all electrical power to the unit to avoid shock hazard or injury from rotating parts. During startup, it is necessary to perform routine checks on the performance of the unit. This includes checking of the air flow, the air filters, condenser water flow and refrigerant charge. Due to the charge-critical nature of these units, refrigerant pressure gauges should only be hooked up to the unit if there is suspicion of an issue within the circuit. Supply Fans WSHP Series units are equipped with direct drive forward curved plenum supply fan assemblies that deliver the air volume specified according to unit size and job requirements. 32

33 Motor Tap RPMs Fan ECM RPM PSC Tap Speed Tap High 1200 Black 3 Med 950 Blue 2 Low 800 Red 1 Figure 22 - WSHP Series Supply Fan Fan Air Flow Adjustment A specific air volume is delivered by the PSC or Electronically Commutated Motors (ECM) fans. Field air flow adjustment may be required at startup. Standard PSC and ECM motor options have limited RPM Adjustment to adjust airflow. Each motor type has three speed taps to select from: High, Medium, and Low. Adjustment for the PSC speed must be made by altering the motor power connected to the motor. Adjustment for the ECM speed is made by adjusting the call wire to the corresponding 1/4 speed terminal directly on the motor body. Note: RPMs are approximate, and will vary slightly depending on TSP across the blower assembly Filters Do not operate the unit without filters in place. Unit should be checked for correct filter placement during startup. Operation of the equipment without filters will result in a clogged evaporator coil. CAUTION Before completing startup and leaving the unit a complete operating cycle should be observed to verify that all components are functioning properly. Adjusting Refrigerant Charge CAUTION Due to the charge-critical nature of these units, charge should only be adjusted if absolutely necessary. Adjusting the charge of a system in the field must be based on determination of liquid sub-cooling and evaporator superheat. On a system with a TXV liquid sub-cooling is more representative of the charge than evaporator superheat but both measurements must be taken. 33

34 Before Charging Unit being charged must be at or near full load conditions before adjusting the charge. Units equipped with hot gas reheat must be charged with the hot gas reheat valves closed while the unit is in cooling mode to get the proper charge. After charging, unit should be operated in reheat (dehumidification) mode to check for correct operation. After adding or removing charge the system must be allowed to stabilize, typically minutes, before making any other adjustments. The type of unit and options determine the ranges for liquid sub-cooling and evaporator superheat. Refer to the tables below when determining the proper sub-cooling. Checking Liquid Sub-Cooling Measure the temperature of the liquid line as it leaves the condenser. Read the gauge pressure at the liquid line close to the point where the temperature was taken. Convert the pressure obtained to a saturated temperature using the appropriate refrigerant temperature-pressure chart. Subtract the measured liquid line temperature from the saturated temperature to determine the liquid sub-cooling. Compare calculated sub-cooling to the table below for the appropriate unit type and options. Convert the pressure obtained to a saturated temperature using the appropriate refrigerant temperature-pressure chart. Subtract the saturated temperature from the measured suction line temperature to determine the evaporator superheat. Compare calculated superheat to the table below for the appropriate unit type and options. CAUTION DO NOT OVERCHARGE! Refrigerant overcharging leads to excess refrigerant in the condenser coils resulting in elevated compressor discharge pressure. Table 6 - Acceptable Refrigeration Circuit Values at AHRI ISO WLHP Conditions Water-Source Heat Pump Sub-Cooling 4-8 F Superheat 8-15 F CAUTION Thermal expansion valve must be adjusted to approximately 8-15 F of suction superheat. Failure to have sufficient superheat will damage the compressor and void the warranty. Checking Evaporator Superheat Measure the temperature of the suction line close to the compressor. Read gauge pressure at the suction line close to the compressor. 34

35 Adjusting Sub-Cooling and Superheat Temperatures The system is overcharged if the sub-cooling temperature is too high and the evaporator is fully loaded (low loads on the evaporator result in increased sub-cooling) and the evaporator superheat is within the temperature range as shown in the table above (high superheat results in increased sub-cooling). Correct an overcharged system by reducing the amount of refrigerant in the system to lower the sub-cooling. The system is undercharged if the superheat is too high and the sub-cooling is too low Correct an undercharged system by adding refrigerant to the system to reduce superheat and raise sub-cooling. If the sub-cooling is correct and the superheat is too high, the TXV may need adjustment to correct the superheat. 35

36 Table 7 - R-410A Refrigerant Temperature-Pressure Chart F PSIG F PSIG F PSIG F PSIG F PSIG

37 AAON WSHP Pioneer Silver Controller Part Number: V67470 Description The Water Source Heat Pump Basic controller (V67470) contains all the functionality required to operate the basic configuration of AAON s WSHP HVAC units. The controller receives commands from a standard heat pump room thermostat and has outputs to control a supply fan, a single on/off compressor, and a reversing valve. The control also contains a 3 pin Modbus port for communication to the Water Source Heat Pump Expansion board (V75410) if the customer requires more functionality. Note: If the installation uses an obsolete mercury bulb type thermostat, it is recommended that the thermostat be upgraded to an electronic thermostat. The unit will not function properly when controlled via a mercury-bulb thermostat. Input/Output Descriptions Pluggable Screw Terminal Blocks Pluggable Screw Terminal Block H1 - Communication EIA-485 Network + = Network terminal. Used for communication with the WSHP expansion board. - = Network terminal. Used for communication with the WSHP expansion board. S = Shield Pluggable Screw Terminal Block H2 AL1 = Dry, normally open contact with terminal AL2. Contact closes when controller is in alarm. AL2 = Dry, normally open contact with terminal AL1. Contact closes when controller is in alarm. COM = 24VAC Common. ESD = Emergency shutdown Input. 24VAC or common may be used as inputs. NS = Night setback mode enable. 24VAC or common may be used as inputs. NO = Dry, normally open contact with terminal IN. Contact closes when compressor is active. IN = Common input for terminals NO and NC. NC = Dry, normally closed contact with terminal IN. Contact opens when compressor is active. Pluggable Screw Terminal Block H5 24V = 24VAC power output for thermostat. NS_OV = Night setback override input. Input requires 24VAC to activate. O = Thermostat input for reversing valve operation. Input requires 24VAC to activate. COM = 24VAC common for thermostat power. G = Thermostat input for fan operation. Input requires 24VAC to activate. TH_NS = Night setback compressor enable. Input requires 24VAC to activate. Y = Thermostat input for compressor operation. Input requires 24VAC to activate. AL = 24VAC wet alarm output. Quick Disconnect Terminals P1 - AUX = Auxiliary alarm terminal. Dry contact with AUX IN enables alarm. P2 - AUX IN = Auxiliary alarm terminal. Dry contact with AUX enables alarm. P3 - TEST= Delay override terminal. Dry contact with TEST IN enables the delay override function. P4 - TEST IN = Delay override terminal. Dry contact with TEST enables the delay override function. 37

38 General Requirements Electrical Supply Voltage 24VAC (+25%/-15%), Class 2 Supply Power 5VA Outputs Relay Outputs: 1A maximum per output, 2A maximum for all outputs combined Input Requirements Resistive Inputs: require 10K Type 3 Thermistor 24VAC Inputs: Inputs provide 4.7kΩ Load 2.2 Environmental Operating Temperature F ( C) Storage Temperature F ( C) Humidity (Storage and Operating) 0-95%RH non-condensing 2.3 Mounting & Dimensions Mounting Mount via 4 shoulder eyelets located on the corners of the circuit board. Dimensions 5.50 x 4.00 Pioneer Silver Layout 38

39 Figure 23 Pioneer Silver Layout Wire Harnesses Wiring Harness H3 Wire Functions PURPLE = Evap coil temperature sensor. To be used with 10k Type III thermistors. WHITE = Evap coil temperature sensor. To be used with 10k Type III thermistors. TAN = Water output temperature sensor. To be used with 10k Type III thermistors. GRAY = Water output temperature sensor. To be used with 10k Type III thermistors. PINK = Not used BROWN = Condensate pan sensor input. GREEN = Low pressure switch. Input requires a normally closed switch. ORANGE = Low pressure switch. Input requires a normally closed switch. BLACK = High pressure switch. Input requires a normally closed switch. YELLOW = High pressure switch. Input requires a normally closed switch. RED = 24VAC power. BLUE = 24VAC common. RED = Reversing valve common wire. BLUE = Fan 24VAC output. BROWN = Fan common wire. GREEN = Compressor contactor 24VAC output. WHITE = Compressor contactor common wire. Wiring Harness H6 Wire Functions BLACK = Reversing valve 24VAC output. 39