Trane WPVJ, WPHF manual Connecting a Distributed Pump Kit to a Closed Loop System, Using Antifreeze

Page 17

Installation

Connecting a Distributed Pump Kit to a Closed Loop System

All piping external to the unit is the re- sponsibility of the installer. The water pipe installation must be done in ac- cordance with local codes. If no local code applies, national codes should be followed. It is the contractor’s respon- sibility to know and adhere to all appli- cable codes.

Water inlet and outlet to the unit’s wa- ter-to-refrigerant heat exchanger are clearly marked on the submittal draw- ings found on pages 7 through 13. The supply and return piping must be in- stalled correctly to the unit to ensure the safety devices will work properly. Units that are not piped accordingly will not obtain the manufacturers war- ranty.

A pump module and hose kit (Figure 5) may be used to connect the unit to closed loop piping.

Using Antifreeze

In areas of the country where entering water temperatures drop below 45°F or where piping is being run through areas subject to freezing, the loop must be freeze protected by using an approved antifreeze solution to pre- vent the earth loop water from freez- ing inside the heat exchanger. Methanol, Ethylene, and Propylene Glycol are the most commonly used antifreeze solutions. Consult your geo- thermal unit supplier for the best solu- tions in your area.

Propylene glycol is not recommended in installations where the water tem- perature are expected to fall below 30°F. At extreme temperatures, the vis- cosity increases to the point where normal loop circulating pumps cannot maintain proper flow.

Calculate the approximate volume of water in the system by using the re- quirements detailed in Table 2. Add three gallons to this total to allow for the water contained in the hose kit and geothermal unit.

From Units To Units

W.O. W.I.

Bronze or Cast Iron Pump

Purging Cap (2)

Shut-off 3-way Valve (2)

1" MPT x barb fittings

1" MPT x barb elbows with pressure temperature ports and 10’ of rubber hose with 4 hose clamps

Figure 5: Pump module and hose kit

Table 2: Required Antifreeze by volume

Type of

Minimum Temperature for

 

Freeze Protection

 

Antifreeze

 

 

10°F

15°F

20°F

25°F

30°F

 

Methanol

25%

21%

16%

10%

3%

 

 

 

 

 

 

Propylene

23%

21%

19%

9%

6%

Glycol

 

 

 

 

 

Ethylene Glycol

20%

19%

16%

14%

12%

Cleaning and Flushing

the Water Loop

After the piping system is complete, cleaning and flushing the water loop should be done to avoid trash settle- out in the condenser (Figure 6). An ex- tra pipe may be necessary to connect the hose kits.

1Electrical power to the unit should be disconnected.

2Double back the supply hose and connect directly to the return riser valve.

3Fill the water system with clean wa- ter using the water make up connec- tions. Note: Air vents should be opened during filling.

4With the air vents closed, start the circulating pump and then crack the air vents to bleed off the trapped air, as- suring circulation through all compo- nents of the system. Note: Make up water must be available to the system to replace the volume formerly occu- pied by the air that is bled off.

5With the air vented and the water circulating, the entire system should be checked for leaks with repairs made as required.

6Check and adjust the water/air level in the expansion tank.

7Operate the boiler (if used) by rais- ing the loop temperature to approxi- mately 85°F. Make checks per manufacturer’s instructions. During this operation, visual checks should be made for leaks that may have occurred due to increased heat. Repair as re- quired.

8Open the system at the lowest point for the initial blow down (making sure the make up water is equal to the wa- ter being dumped). Continue blow down until the water leaving the drain runs clear, but not less than 2 hours.

9Shut down pumps and boiler (if used). Reconnect the hoses to the proper supply/return for each unit, placing the water-to-refrigerant heat exchanger in the water circulating sys- tem. Note: Vents should be open when the pumps and boiler are shut down.

10Refill the system and bleed off any air. Add antifreeze to the system in cli- mates where ambient temperature falls below freezing, using the propor- tion of antifreeze shown in Table 2.

Figure 6: System flushing

WSHP-SVX04A-EN

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Contents Later Design Sequence Installation Owner DiagnosticsResponsible Refrigerant Practices Contents Microbial Growth Pre-installation ChecklistFiberglass Wool General Information Improper Unit Lift Dimensions/Weights/ ClearanceDimensions Wpvj 018-024 LH Wpvj 018-024 RH Wpvj 030-042 LH Wpvj 030-042 RH Wpvj 048-072 LH Wpvj 048-072 RH General Installation Checks InstallationLow Voltage Wiring AC & DC Requirements Filter InstallationWater Connection Unit Installation WpvjUnit Installation Wphf Cleaning and Flushing Water Loop Connecting a Distributed Pump Kit to a Closed Loop SystemUsing Antifreeze Control Power Transformer Field Installed Power WiringThermostat Location Installation Low Voltage WiringAmpacity Device Electrical RequirementsRLA FLA RLA CSA Case WPHF057 Pre-Start-up Checklist Pre-Start ChecklistSequence Operation Wpvj Operating PressuresOperating Pressure Start-up Checklist and Log Water VolumeWater Pressure Drop Flow ChecksJob Name Model Number Date Serial Number Start-up Checklist LogHazardous Chemicals MaintenancePreventive Maintenance Warranty Information Standard Warranty Warranty InformationHazardous Service Procedures TroubleshootingGeneral Operation Operation with a Conventional ThermostatUnit short cycles Troubleshooting ChecklistUnit Wiring Wpvj Basic 24V Diagram Unit Wiring Wpvj Tracer ZN510 Diagram Unit Wiring Wphf Basic 24V Diagram Unit Wiring Wphf Tracer ZN510 Diagram Trane