Carrier Aquazone 50PSW025 Installation, Start-Up And Service Instructions Manual
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Carrier Aquazone 50PSW025 Installation, Start-Up And Service Instructions Manual

Carrier Aquazone 50PSW025 Installation, Start-Up And Service Instructions Manual

Water-to-water source heat pump with puron® refrigerant (r-454b)
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CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 2
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Step 1 — Check Jobsite . . . . . . . . . . . . . . . . . . . . . . . 3
Step 2 — Check Unit . . . . . . . . . . . . . . . . . . . . . . . . . . 3
• INSPECTION
• INSPECT UNIT
• PROTECTION
Step 3 — Locate Unit . . . . . . . . . . . . . . . . . . . . . . . . . 4
Step 4 — Mount Unit . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Step 5 — Connect Piping . . . . . . . . . . . . . . . . . . . . . . 9
• WATER SUPPLY AND QUALITY
• INSTALLATION OF HOT WATER GENERATOR
OPTION (ONLY 025-71 SIZES)
• TYPICAL HOT WATER GENERATOR INSTALLATION
• COOLING TOWER/BOILER APPLICATION
• WELL WATER SYSTEMS
• EARTH COUPLED GEOTHERMAL SYSTEMS
Step 6 — Wire Field Power Supply . . . . . . . . . . . . . 13
Additional Installation Requirements . . . . . . . . . . . 25
Installation Options . . . . . . . . . . . . . . . . . . . . . . . . . . 25
• OPTION 1
• OPTION 2
• OPTION 3
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
System Checkout . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Wire Control Connections . . . . . . . . . . . . . . . . . . . . 26
• ADDITIONAL CONTROLS OPTIONS WIRING
• PUMP RELAY
• ENERGY MANAGEMENT SWITCH
• PHASE MONITOR
• ALARM OUTPUT
• W2W OPEN CONTROL
• CONTROL TRANSFORMER
Configure Unit Control Components . . . . . . . . . . . 27
• UPM CONFIGURATION
• UPM FEATURES
• CONSIDERATIONS
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Unit Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Operating Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
• ENVIRONMENT
• POWER SUPPLY
Scroll Compressor Rotation . . . . . . . . . . . . . . . . . . 53
Cleaning and Flushing . . . . . . . . . . . . . . . . . . . . . . . 53
Antifreeze . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
System Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53500417-01
Installation, Start-Up, and
Service Instructions
Printed in U.S.A.
Form No. 50PSW-6SI
Water-to-Water Source Heat Pump
with Puron
• FLOW VERIFICATION
• FLOW REGULATION
Page
Cooling Tower/Boiler Systems . . . . . . . . . . . . . . . . .54
Ground Coupled, Closed Loop and Plateframe Heat
Exchanger Well Systems . . . . . . . . . . . . . . . . . . .54
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
Power Up Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
Unit Protection Model (UPM) . . . . . . . . . . . . . . . . . .56
Units without DDC controller . . . . . . . . . . . . . . . . . .56
• COOLING MODE
• HEATING MODE
Units with W2W Open Controls . . . . . . . . . . . . . . . .56
SEQUENCE OF OPERATION . . . . . . . . . . . . . . . . . .56
WSHP Open W2W . . . . . . . . . . . . . . . . . . . . . . . . . . .56
• OCCUPANCY
• BAS (BUILDING AUTOMATION SYSTEM) ON/OFF
• REMOTE OCCUPANCY CONTACT
• SHUTDOWN
• POWER FAIL RESTART DELAY
• CHANGEOVER TIMEGUARD
• LOAD PUMP
• SOURCE WATER ISOLATION VALVE/SOURCE
WATER PUMP OUTPUT
• COOLING (SINGLE MODULE)
• ADDITIONAL COOLING FUNCTIONS
• COOLING CONTROL MODES
• HEATING (SINGLE MODULE)
• ADDITIONAL HEATING FUNCTIONS
• HEATING CONTROL MODES
• MUTLI-UNIT PRIMARY
• EQUIPMENT ALARM
• SERVICE TEST
UPM SEQUENCE OF OPERATION . . . . . . . . . . . . . .62
Hot Water Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . .62
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62
• HANDLING PERIODIC LOCKOUTS
• SERVICING AND REPAIR INFORMATION
Ignition Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62
Ventilated Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62
Checks to The Refrigerating Equipment . . . . . . . . .62
Checks to Electrical Devices . . . . . . . . . . . . . . . . . .62
Check Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
Detection of Flammable Refrigerants . . . . . . . . . . .63
Removal and Evacuation . . . . . . . . . . . . . . . . . . . . .63
Charging Procedures . . . . . . . . . . . . . . . . . . . . . . . .63
Recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
Decommissioning Information . . . . . . . . . . . . . . . . .64
Protecting the Environment . . . . . . . . . . . . . . . . . . .64
• COMPONENTS
• REFRIGERANT
Aquazone
50PSW025-420
®
Refrigerant (R-454B)
Pg 1
6-25
Replaces: 50PSW-5SI
™

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  • Page 1 ™ Aquazone 50PSW025-420 Water-to-Water Source Heat Pump ® with Puron Refrigerant (R-454B) Installation, Start-Up, and Service Instructions • FLOW VERIFICATION CONTENTS • FLOW REGULATION Page Cooling Tower/Boiler Systems ....54 SAFETY CONSIDERATIONS .

  • Page 2: Safety Considerations

    Carrier-approved models Follow all safety codes. Wear safety glasses and work gloves. Use exclusively. Carrier bears no responsibility for the installation quenching cloth for brazing operations. Have fire extinguisher of any alternative auxiliary devices installed in the field. available. Read these instructions thoroughly an d follow all warn- ings or cautions attached to the unit.

  • Page 3: Installation

    Wait to remove the packaging until the unit is ready for accordance with Carrier’s recommended service clearances and installation. installation instructions. Please refer to the Carrier Commercial WSHP Warranty Statement (document number 04-570008-01) Verify that the refrigerant tubing is free of kinks or dents, and for details on warranty exclusions regarding equipment, access, that it does not touch other unit components.

  • Page 4: Step 3 - Locate Unit

    PROTECTION Once the units are properly positioned on the jobsite, they must be CAUTION covered with either a shipping carton, vinyl film, or an equivalent protective covering. Open ends of pipes stored on the jobsite must DO NOT store or install units in corrosive environments or in be capped.
  • Page 5 Table 1 — 50PSW025-420 Physical Data 50PSW SERIES Compressor Type Scroll Scroll Scroll Scroll Scroll Scroll Scroll Scroll Scroll Scroll Scroll Compressor Qty (ckts) Max Water Working Pressure 450/3100 450/3100 450/3100 450/3100 450/3100 450/3100 450/3100 450/3100 450/3100 450/3100 450/3100 (psig/kPa) Water Connection Size 3/4"...
  • Page 6 Electrical Connections Unit Rear Left Side Front Left Side Source Out Electrical Connections Load Out Source In Load In DIMENSIONS (INCHES) WATER UNIT CONN. SIZE (FPT) 37.5 27.62 8.37 10.5 32.25 19.5 13.5 17.5 1-1/4 37.5 27.62 8.37 10.5 32.25 23.5 13.5 17.5...
  • Page 7 Electrical Connections Unit Rear Left Side Front Left Side Electrical Connections Source Out Load Out Source In Load In DIMENSIONS (INCHES) WATER UNIT CONN. SIZE (FPT) 43.5 24.5 10.5 48.5 19.5 29.25 17.5 43.5 24.5 10.5 48.5 23.5 29.25 17.5 43.5 24.5 10.5...
  • Page 8 Sizes 025 thru 071 (Top View) No access panels are located on this side. Source Side Load Side l a i l a i and bottom and bottom No access is No access is required on this required on this side.

  • Page 9: Step 4 - Mount Unit

    Carrier Always check carefully for water leaks and repair appropriately. recommends proper testing to assure the well water quality is Units are equipped with female pipe thread fittings.

  • Page 10: Water Supply And Quality

    WATER SUPPLY AND QUALITY Purge all air from HWG by depressing the Schrader valve on the HR unit. Allow all air to bleed out until water appears at Check water supply. Water supply should be plentiful and of good the valve. quality.

  • Page 11: Earth Coupled Geothermal Systems

    Line voltage solenoids connected across the load side (T1, T2) of EARTH COUPLED GEOTHERMAL SYSTEMS the compressor contactor are preferred. Closed loop and pond applications require specialized design Pilot operated or slow closing valves are recommended to reduce knowledge. No attempt at these installations should be made water hammer.
  • Page 12 Table 2 — Water Quality Guidelines CLOSED CONDITION OPEN LOOP AND RECIRCULATING WELL MATERIAL RECIRCULATING Scaling Potential — Primary Measurement Above the given limits, scaling is likely to occur. Scaling indexes should be calculated using the limits below. pH/Calcium Hardness Method pH <...
  • Page 13 All field wiring must comply with local and national fire, safety Step 6 — Wire Field Power Supply and electrical codes. Power to the unit must be within the operating voltage range indicated on the unit’s nameplate. On WARNING three phase units, phases must be balanced within 2%. Properly sized fuse or HACR (heating, air-conditioning, and To avoid possible injury or death due to electrical shock, open refrigeration) circuit breakers must be installed for branch circuit...
  • Page 14 COLOR CHART LEGEND UPM STATUS LED - BLINK CODES ABBREVIATION COLOR HIGH PRESSURE FAULT BLACK USE CLASS II FIELD WIRING BLUE LOW PRESSURE FAULT BROWN LOAD FREEZE CONDITION GRAY GREEN CONDENSATE OVERFLOW FAULT L1 L2 ORANGE BROWN OUT FAULT VIOLET SOURCE FREEZE CONDITION WHITE REFRIGERANT LEAKAGE...
  • Page 15 COLOR CHART LEGEND ABBREVIATION COLOR USE CLASS II FIELD WIRING BLACK BLUE BROWN GRAY GREEN ORANGE VIOLET WHITE YELLOW L1 L2 HPS1 CMR1 LPS1 BN BN FREEZE1 LOAD STANDARD COMPONENTS LEGEND: SEE CHART FOR PRIMARY LEAD COLOR TO DDC - AIR TO LIQUID REFRIGERANT LEAK SENSOR FREEZE2 ALARM SOURCE...
  • Page 16 COLOR CHART LEGEND UPM STATUS LED - BLINK CODES ABBREVIATION COLOR HIGH PRESSURE FAULT BLACK BLUE LOW PRESSURE FAULT BROWN USE CLASS II FIELD WIRING LOAD FREEZE CONDITION GRAY TO WSHP OPEN INTERFACE J1 AND J11 GREEN CONDENSATE OVERFLOW FAULT ORANGE BROWN OUT FAULT VIOLET...
  • Page 17 COLOR CHART LEGEND ABBREVIATION COLOR USE CLASS II FIELD WIRING BLACK TO WSHP OPEN INTERFACE J1 AND J11 BLUE BROWN GRAY GREEN ORANGE VIOLET CMR1 WHITE YELLOW CMR2 L1 L2 HPS1 CMR1 LPS1 BN BN FREEZE1 LOAD SEE CHART FOR PRIMARY LEAD COLOR FREEZE2 ALARM...
  • Page 18 COLOR CHART LEGEND UPM STATUS LED - BLINK CODES ABBREVIATION COLOR HIGH PRESSURE FAULT BLACK BLUE LOW PRESSURE FAULT BROWN LOAD FREEZE CONDITION GRAY USE CLASS II FIELD WIRING GREEN CONDENSATE OVERFLOW FAULT ORANGE BROWN OUT FAULT VIOLET SOURCE FREEZE CONDITION WHITE REFRIGERANT LEAKAGE YELLOW...
  • Page 19 COLOR CHART LEGEND UPM STATUS LED - BLINK CODES ABBREVIATION COLOR HIGH PRESSURE FAULT BLACK BLUE LOW PRESSURE FAULT BROWN LOAD FREEZE CONDITION GRAY GREEN CONDENSATE OVERFLOW FAULT USE CLASS II FIELD WIRING ORANGE BROWN OUT FAULT VIOLET SOURCE FREEZE CONDITION WHITE REFRIGERANT LEAKAGE YELLOW...
  • Page 20 AMF1 AMF2 COLOR CHART LEGEND USE CLASS II FIELD WIRING ABBREVIATION COLOR BLACK BLUE BROWN GRAY GREEN ORANGE VIOLET WHITE YELLOW HPS1 LPS1 CMR1 BN BN FREEZE1 LOAD TO DDC STANDARD COMPONENTS LEGEND: FREEZE2 ALARM SOURCE STATUS - AIR TO LIQUID REFRIGERANT LEAK SENSOR THERMOSTAT 1st Stage - A2L MITIGATION FAN...
  • Page 21 COLOR CHART LEGEND UPM STATUS LED - BLINK CODES ABBREVIATION COLOR HIGH PRESSURE FAULT BLACK BLUE LOW PRESSURE FAULT BROWN LOAD FREEZE CONDITION GRAY USE CLASS II FIELD WIRING GREEN CONDENSATE OVERFLOW FAULT TO WSHP OPEN INTERFACE J1 AND J11 ORANGE BROWN OUT FAULT VIOLET...
  • Page 22 COLOR CHART LEGEND UPM STATUS LED - BLINK CODES USE CLASS II FIELD WIRING ABBREVIATION COLOR HIGH PRESSURE FAULT TO WSHP OPEN INTERFACE J1 AND J11 BLACK BLUE LOW PRESSURE FAULT BROWN LOAD FREEZE CONDITION GRAY GREEN CONDENSATE OVERFLOW FAULT ORANGE BROWN OUT FAULT VIOLET...
  • Page 23 USE CLASS II FIELD WIRING COLOR CHART LEGEND AMF2 AMF1 TO WSHP OPEN INTERFACE J1 AND J11 ABBREVIATION COLOR BLACK BLUE BROWN GRAY GREEN ORANGE CMR1 VIOLET WHITE YELLOW CMR2 HPS1 LPS1 CMR1 BN BN FREEZE1 LOAD FREEZE2 ALARM SOURCE STANDARD COMPONENTS LEGEND: STATUS - AIR TO LIQUID REFRIGERANT LEAK SENSOR...
  • Page 24 UNIT TERMINAL BLOCK CLASS II VOLTAGE FACTORY WIRED COMPONENTS J1-9 CAN BE USED TO CONNECT WATER FLOW SWITCH, FIRE ALARM FIELD WIRED COMPONENTS AND/OR PHASE MONITOR OPTIONS CMR 2 CONNECTOR WILL BE INCLUDED ON ALL W2W HARNESSES BUT STANDARD COMPONENTS: ONLY NEEDS TO BE CONNECTED TO CMR2 ON TWO STAGE UNITS THAT HAVE 2 CMR'S.
  • Page 25 OPTION 2 Additional Installation Requirements There are certain requirements that must be met to employ the use If unit is installed in a room with area smaller than Amin, it must of units with R-454B Refrigerant (A2L group) depending on the be ducted to the outdoors.

  • Page 26: Pre-Start-Up

    See the applicable wiring diagrams within this document WARNING for details. For further instructions on W2W Open, please visit HVACPartners.com or Carrier.com for the W2W Open To avoid possible injury or death due to electrical shock, open Integration Guide and Points/Properties Guide.
  • Page 27 Configure Unit Control Components Each unit is provided with a unit protection module (UPM) which controls the compressor and provides the unit safety controls and monitoring. See Fig. 19-21 for the UPM board layout and freeze sensor. Safety Controls include the following: High Pressure Switch (HPS):...
  • Page 28 UPM FEATURES Anti-Short Cycle Timer 5-minute delay on break timer to prevent compressor short cycling. Random Start Each controller has a unique random start delay ranging from 270 to 300 seconds on initial power up to reduce the chance of multiple units simultaneously starting at the same time (after power up or after a power interruption), thus avoiding creating a large electrical spike.
  • Page 29 Low Pressure Sensor #1 pressure has fallen below 40 psig. Carrier recommends the following guidelines for wiring Refrigerant discharge between a thermostat and the unit: 18 GA up to 60 ft, 16 GA High Pressure Sensor #2 pressure has exceeded 600 psig.

  • Page 30: Unit Start-Up

    12. Check the heating refrigerant pressures against the values START-UP listed in Tables 15-25. Use the procedure outlined below to initiate proper unit start-up. 13. Set the primary controller to maintain the desired return fluid NOTE: This equipment is designed for indoor installation only. temperature.
  • Page 31 Table 15 — 50PSW025 Typical Unit Operating Pressures and Temperatures COOLING Entering Fluid Temp Entering Fluid Water Temp Water Temp Discharge Suction Size (°F) Temp (°F) Rise (°F) Drop (°F) Pressure Pressure (Source) (Load) (Source) (Load) 174-194 78-88 11-13 10-12 161-181 88-98 182-202...
  • Page 32 Table 15 — 50PSW025 Typical Unit Operating Pressures and Temperatures (cont) HEATING Entering Fluid Temp Water Temp Water Temp Discharge Suction Size (°F) 789K Drop (°F) Rise (°F) Pressure Pressure (Source) (Source) (Load) 188-208 50-60 8-10 178-198 57-67 256-276 55-65 8-10 243-263 59-69...
  • Page 33 Table 16 — 50PSW035 Typical Unit Operating Pressures and Temperatures COOLING Entering Fluid Temp Entering Fluid Water Temp Water Temp Discharge Suction Size (°F) Temp (°F) Rise (°F) Drop (°F) Pressure Pressure (Source) (Load) (Source) (Load) 194-214 75-85 14-16 12-14 178-198 85-95 8-10...
  • Page 34 Table 16 — 50PSW035 Typical Unit Operating Pressures and Temperatures (cont) HEATING Entering Fluid Temp Entering Fluid Water Temp Water Temp Discharge Suction Size (°F) Temp (°F) Drop (°F) Rise (°F) Pressure Pressure (Source) (Load) (Source) (Load) 205-225 47-57 9-11 11-13 205-225 53-63...
  • Page 35 Table 17 — 50PSW049 Typical Unit Operating Pressures and Temperatures COOLING Entering Fluid Temp Entering Fluid Water Temp Water Temp Discharge Suction Size (°F) Temp (°F) Rise (°F) Drop (°F) Pressure Pressure (Source) (Load) (Source) (Load) 206-226 63-73 17-19 14-16 188-208 72-82 9-11...
  • Page 36 Table 17 — 50PSW049 Typical Unit Operating Pressures and Temperatures (cont) HEATING Entering Fluid Temp Entering Fluid Water Temp Water Temp Discharge Suction Size (°F) Temp (°F) Drop (°F) Rise (°F) Pressure Pressure (Source) (Load) (Source) (Load) 212-232 43-53 9-11 12-14 198-218 49-59...
  • Page 37 Table 18 — 50PSW061 Typical Unit Operating Pressures and Temperatures COOLING Entering Fluid Temp Entering Fluid Water Temp Water Temp Discharge Suction Size (°F) Temp (°F) Rise (°F) Drop (°F) Pressure Pressure (Source) (Load) (Source) (Load) 203-223 45-55 17-19 14-16 182-202 51-61 9-11...
  • Page 38 Table 18 — 50PSW061 Typical Unit Operating Pressures and Temperatures (cont) HEATING Entering Fluid Temp Entering Fluid Water Temp Water Temp Discharge Suction Size (°F) Temp (°F) Rise (°F) Drop (°F) Pressure Pressure (Source) (Load) (Source) (Load) 213-233 27-37 10-12 13-15 13.0 199-219...
  • Page 39 Table 19 — 50PSW071 Typical Unit Operating Pressures and Temperatures COOLING Entering Fluid Temp Entering Fluid Water Temp Water Temp Discharge Suction Size (°F) Temp (°F) Rise (°F) Drop (°F) Pressure Pressure (Source) (Load) (Source) (Load) 202-222 50-60 17-19 14-16 15.0 182-202 57-67...
  • Page 40 Table 19 — 50PSW071 Typical Unit Operating Pressures and Temperatures (cont) HEATING Entering Fluid Temp Entering Fluid Water Temp Water Temp Discharge Suction Size (°F) Temp (°F) Drop (°F) Rise (°F) Pressure Pressure (Source) (Load) (Source) (Load) 195-215 42-52 11-13 13-15 15.0 182-202...
  • Page 41 Table 20 — 50PSW122 Typical Unit Operating Pressures and Temperatures COOLING Entering Fluid Temp Entering Fluid Water Temp Water Temp Discharge Suction Size (°F) Temp (°F) Rise (°F) Drop (°F) Pressure Pressure (Source) (Load) (Source) (Load) 17.5 175-195 65-75 35.0 159-179 68-78 17.5...
  • Page 42 Table 20 — 50PSW122 Typical Unit Operating Pressures and Temperatures (cont) HEATING Entering Fluid Temp Entering Fluid Water Temp Water Temp Discharge Suction Size (°F) Temp (°F) Drop (°F) Rise (°F) Pressure Pressure (Source) (Load) (Source) (Load) 17.5 192-212 33-43 35.0 186-206 35-45...
  • Page 43 Table 21 — 50PSW180 Typical Unit Operating Pressures and Temperatures COOLING Entering Fluid Temp Entering Fluid Water Temp Discharge Suction Water Temp Size (˚F) Temp (˚F) Rise ˚F Pressure Pressure Drop ˚F (Load) Source Load (Source) 233-253 42-52 11-13 10-12 213-233 48-58 241-261...
  • Page 44 Table 21 — 50PSW180 Typical Unit Operating Pressures and Temperatures (cont) HEATING Entering Fluid Temp Entering Fluid Water Temp Water Temp Discharge Suction Size (°F) Temp (°F) Drop (°F) Rise (°F) Pressure Pressure (Source) (Load) (Source) (Load) 251-271 28-38 8-10 232-252 32-42 320-340...
  • Page 45 Table 22 — 50PSW210 Typical Unit Operating Pressures and Temperatures COOLING Entering Fluid Entering Fluid Water Temp Water Temp Discharge Suction Size Temp (°F) Temp (°F) Rise (°F) Drop (°F) Pressure Pressure (Source) (Load) (Source) (Load) 200-220 56-66 12-14 10-12 190-210 62-72 209-229...
  • Page 46 Table 22 — 50PSW210 Typical Unit Operating Pressures and Temperatures (cont) HEATING Entering Fluid Entering Fluid Water Temp Water Temp Discharge Suction Size Temp (°F) Temp (°F) Drop (°F) Rise (°F) Pressure Pressure (Source) (Load) (Source) (Load) 213-233 34-44 9-11 201-221 37-47 281-301...
  • Page 47 Table 23 — 50PSW240 Typical Unit Operating Pressures and Temperatures COOLING Entering Fluid Temp Entering Fluid Water Temp Water Temp Discharge Suction Size (°F) Temp (°F) Rise (°F) Drop (°F) Pressure Pressure (Source) (Load) (Source) (Load) 203-223 58-68 191-211 64-74 208-228 71-81 195-215...
  • Page 48 Table 23 — 50PSW240 Typical Unit Operating Pressures and Temperatures (cont) HEATING Entering Fluid Temp Entering Fluid Water Temp Water Temp Discharge Suction Size (°F) Temp (°F) Drop (°F) Rise (°F) Pressure Pressure Source Load (Source) (Load) 229-249 29-39 218-238 33-43 302-322 31-41...
  • Page 49 Table 24 — 50PSW360 Typical Unit Operating Pressures and Temperatures COOLING Entering Fluid Temp Entering Fluid Water Temp Water Temp Discharge Suction Size (°F) Temp (°F) Rise (°F) Drop (°F) Pressure Pressure Source Load (Source) (Load) 211-231 58-68 197-217 63-73 217-237 71-81 202-222...
  • Page 50 Table 24 — 50PSW360 Typical Unit Operating Pressures and Temperatures (cont) HEATING Entering Fluid Temp Entering Fluid Water Temp Water Temp Discharge Suction Size (°F) Temp (°F) Drop (°F) Rise (°F) Pressure Pressure (Source) (Load) (Source) (Load) 231-251 32-42 221-241 36-46 302-322 35-45...
  • Page 51 Table 25 — 50PSW420 Typical Unit Operating Pressures and Temperatures COOLING Entering Fluid Temp Entering Fluid Water Temp Water Temp Discharge Suction Size (°F) Temp (°F) Rise (°F) Drop (°F) Pressure Pressure (Source) (Load) (Source) (Load) 191-211 64-74 8-10 163-183 68-78 198-218 78-88...
  • Page 52 Table 25 — 50PSW420 Typical Unit Operating Pressures and Temperatures (cont) HEATING Entering Fluid Temp Entering Fluid Water Temp Water Temp Discharge Suction Size (°F) Temp (°F) Drop (°F) Rise (°F) Pressure Pressure (Source) (Load) (Source) (Load) 205-225 38-48 197-217 41-51 272-292 42-52...

  • Page 53: Scroll Compressor Rotation

    Table 26 — 50PSW Operating Limits LIMIT COOLING HEATING Minimum Ambient Air 50°F 40°F Maximum Ambient Air 100°F 85°F Rated Ambient Air 80°F 68°F Antifreeze Protection Required LWT / EWT — < 40/< 50°F Minimum Water Coil Entering Fluid 50°F 30°F Source Side Maximum Water Coil Entering Fluid...

  • Page 54: Freeze Protection

    Table 27 — Approximate Fluid Volume (gal.) per 100 Ft of Pipe (cont) CAUTION PIPE DIAMETER (in.) VOLUME (gal.) To avoid possible damage to a plastic (PVC) piping system, do 3/4 IPS SDR11 not allow temperatures to exceed 110°F. 1 IPS SDR11 Raise the loop temperature to 100F.
  • Page 55 Flow Rate (gpm) 025-035 Load Side 025-035 Source Side 049 Load Side 049 Source Side 061 Load Side 061 Source Side 071 Load Side 071 Source Side Fig. 23 — Water Pressure Drop Curves (025-071) Flow Rate (gpm) 122 Source Side 122 Load Side 180-210 Load Side 240-420 Load Side...

  • Page 56: Operation

    written by the third-party device to set the controls occupied state OPERATION as required. This method of occupancy determination takes Power Up Mode precedence over all others. No special configuration is necessary to utilize this function. Object address information is also The unit will not operate until all the inputs, terminals and safety described in the W2W Integration Guide.
  • Page 57 The Iso Valve Close Delay default value is 45 seconds and may be The following conditions must be true in order for the Cooling adjusted between 0 and 180. NOTE: On a request for unit Setpoint OA Reset algorithm to run: shutdown (described previously), the valve will remain open until •...
  • Page 58 The following conditions must be true in order for the cooling • The Changeover time guard has elapsed. algorithm to run in the OAT control mode: • Load water temp is above the Chilled Water Supply • A valid Outdoor Air Temperature is present. Setpoint.
  • Page 59 The following conditions must be true in order for the Heating (hardware or network) is required for this mode. Once enabled, Setpoint OA Reset algorithm to run: equipment control is as described for heating and cooling. • preconditions heating operation (described When conditions require heating, the module will operate as previously) have been met.

  • Page 60: Service Test

    MUTLI-UNIT PRIMARY operator. See the Equipment Alarm configuration section for configuration instructions related to Equipment Alarm. On installations having multiple Water to Water Source Heat Pumps serving a common load, the heat pumps may be controlled SERVICE TEST as a singular heating or cooling source utilizing the Multi-unit MS/ The W2W provides a built in Service Test function to allow the TP Operating Mode.
  • Page 61 Fig. 25 — W2W Open Control Board...

  • Page 62: Upm Sequence Of Operation

    must be available on hand. Have a dry powder or CO fire extin- UPM SEQUENCE OF OPERATION guisher adjacent to the charging area. Hot Water Switch Ignition Sources All water-to-water units have a temperature safety switch installed Ensure the following prior to the work taking place: on the load coil.

  • Page 63: Fire Hazard

    several times. Compressed air or oxygen must not be used for purging refrigerant systems. IMPORTANT: REPAIRS TO SEALED COMPONENTS For appliances containing flammable refrigerants, refrigerant Sealed-electrical components must be replaced. purging must be achieved by breaking the vacuum in the system with oxygen-free nitrogen and continuing to fill until the working pressure is achieved, then venting to atmosphere, and finally pull- IMPORTANT:...

  • Page 64: Hazardous Waste

    Ensure a set of calibrated weighing scales are available and in Decommissioning Procedure good working order. Before carrying out this procedure, it is essential that the techni- cian is completely familiar with the equipment and all its detail. 10. Ensure the hoses are complete with leak-free disconnect cou- plings and are in good condition.
  • Page 65 Fig. 26 — Unit Protection Module (UPM) Sequence Of Operation...
  • Page 66 Configuring Multiple W2W WSHP for  Control Mode Selection MS/TP Operation Manual heat, manual cool, SPT, OAT or System T1 Temp On installations having multiple Water-to-Water Source Heat Refrigerant Circuits Pumps serving a common load, the heat pumps may be controlled Configure for the correct number of refrigerant circuits in the unit.
  • Page 67 Fig. 27 — W2W Primary Configuration Parameters - Unit Configurations Fig. 28 — W2W Primary Configuration Parameters - Setpoints Fig. 29 — W2W Primary Configuration Parameter - Service Configuration...
  • Page 68 WARNING CAUTION REFRIGERANT SAFETY WARNINGS This appliance is not intended for use by people (including children) with reduced physical, sensory, or mental The coaxial coil used in this unit is a single-wall heat capabilities, or with lack of experience and knowledge, unless exchanger not suitable for potable water.

  • Page 69: Gravity Flow Method

    Proper water treatment can minimize tube fouling and pitting. If Tank Remove Wa ter such conditions are anticipated, water treatment analysis is Regulating Va lve recommended. Refer to the Carrier System Design Manual, Part 5, for general water conditioning information. Return Fine Mesh Screen CAUTION Fig.

  • Page 70: Checking System Charge

    Read liquid line temperature on thermometer; then subtract Checking System Charge from saturated condensing temperature. The difference Units are shipped with full operating charge. If recharging is equals subcooling temperature. necessary: Insert thermometer bulb in insulating rubber sleeve on liquid Refrigerant Charging line near filter drier.

  • Page 71: Troubleshooting

    troubleshooting solutions. The UPM on each unit includes an TROUBLESHOOTING alarm indicator with blink codes to indicate UPM fault. See When troubleshooting problems arise with a WSHP, refer to Fig. 30-31 for single and two-stage UPM fault codes. Table 13 on page 29 for fault codes. See Table 29 for Table 29 —...
  • Page 72 Table 30 — Single Stage UPM Fault Codes MODE PROBLEM CHECK FAULT POSSIBLE CAUSE ACTION Cooling Heating Unit may be Reclaim refrigerant, evacuate, and recharge with factory overcharged with recommended charge on unit nameplate. refrigerant. Insufficient or low Check the water flow rate and ensure it is within operating limits. Adjust flow rate if necessary.
  • Page 73 Table 31 — Two-Stage UPM Fault Codes MODE POSSIBLE PROBLEM CHECK FAULT ACTION CAUSE Cooling Heating Unit may be Reclaim refrigerant, evacuate, and recharge with factory recommended charge on unit overcharged nameplate. with refrigerant. Insufficient or Check the water flow rate and ensure it is within operating limits. Adjust flow rate if necessary.  low flow to Verify that the water pump is operating correctly and providing adequate flow.
  • Page 74 Inspect all electrical wiring and check for loose connections. cation stage UPM Fault board © 2025 Carrier Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53500417-01 Printed in U.S.A. Form No. 50PSW-6SI...

  • Page 75: Start-Up Checklist

    50-PSW START-UP CHECKLIST NOTE: To avoid injury to personnel and damage to equipment or prop- erty when completing the procedures listed in this start-up checklist, use good judgment, follow safe practices, and adhere to the safety considerations/information as outlined in preceding sections of this Installation, Start-Up and Service Instructions.
  • Page 76 SUBCOOLING = Discharge Saturation Temperature – Liquid Line Temperature (°F) * Use 500 for water, 485 for antifreeze. © 2025 Carrier Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53500417-01 Printed in U.S.A.

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