Trane EXWA, WPWD, GSWD manual Installation, bled off, Flushing water loop, Pump module, Hose kit

Installation

Cleaning and Flushing

the Water Loop

After the piping system is complete, the flexible hose connectors should be doubled back to complete the water circuit external to the unit (avoiding trash settle-out in the condenser). Fig- ure 4. An extra pipe may be necessary to connect the hose kits. See Page 14 for antifreeze/water mixture by vol- ume.

(1)Water circulation system should be filled with clean water using the water make up connections. Note: Air vents should be opened during filling.

(2)With 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 occupied by the air that is

bled off.

(3)With the air vented and the water circulating, the entire system should be checked for leaks with re- pairs made as required.

(4)Operate the supplementary

heat system making checks per manufacturer’s instructions. Dur- ing this operation, visual checks should be made for leaks that may have occurred due to increased heat. Repair as required.

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

(6)Shut down pumps and supplemen- tary heat system. Reconnect the hoses placing the water-to-refrigerant heat exchanger in the water circulating sys- tem.

Note: Vents should be open when the pumps and supplementary heat sys-

tem are shut down.

Figure 4: Flushing water loop

Connecting a Loop Pump Kit 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 9. 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 (Figure 5) and hose kit (Figure 6) are typically used to connect the unit to closed loop piping in do- mestic applications.

FROM UNIT’S	TO UNIT’S
W.O.	W.I.

BRONZE OR CAST IRON PUMP

PURGING CAP (2)

SHUT-OFF 3-WAY

VALVE (2)

Figure 5 Pump module

1" MPT x BARB FITTINGS, 1" MPT x BARB ELBOWS with

PRESSURE TEMPERATURE PORTS, AND 10’ OF RUBBER HOSE with

4 HOSE CLAMPS.

Figure 6: Hose kit

12 WSHP-SVX02A-EN