Supply Pipe Connections; Cleaning And Flushing The Water Loop; Field Installed Power Wiring; Main Unit Power Wiring - Trane Axiom GEH Series Installation, Operation And Maintenance Manual

Supply Pipe Connections

Figure 50. Supply/return pipe connections
WATER-OUT
WATER-IN
AUTOMATIC BALANCING
Connect the supply and return hoses to the water-inlet
(from supply) and water-outlet (to return) of the unit. For
vibration isolation, it is recommended that flexible steel
braided hoses be installed instead of hard piping the
equipment to the main loop system. Figure above shows
connection of a Hays Mesurflo® balancing hose kit to the
water-in and water-out of a vertical unit.
Note: Above figure example incorporates the Hays
Mesurflo® balancing hose kit and a 2-position
isolation valve into the system design. An isolation
valve is often used in variable speed pumping
applications. The isolation valve is designed to stop
water flow to the unit during non operation times.
This allows the loop water pumps to run only when a
requirement for pumping is needed for greater
energy efficiency of the overall system design.
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). An extra pipe may be necessary to connect
the hose kits.
1. Water circulation system should be filled with clean
water using the water make up connections.
Note: Air vents should be open during filling.
2. With the air vents closed, start the circulating pump and
then crack the air vents to bleed off the trapped air,
assuring circulation through all components 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 repairs made
as required.
4. Operate the supplementary heat system (boiler)
making checks per manufacturer's instructions. During
this operation, visual checks should be made for leaks
WSHP-SVX01AC-EN
RETURN
TO
LOOP
SUPPLY
FROM
CENTRAL
PUMP
HOSE KIT
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 supplementary heat system.
Reconnect the hoses placing the water-to-refrigerant
heat exchanger in the water circulating system.
Note: Vents should be open when the pumps and
supplementary heat system are shut down.

Field Installed Power Wiring

WARNING
Proper Field Wiring and Grounding
Required!
Failure to follow code could result in death or serious
injury.
All field wiring MUST be performed by qualified
personnel. Improperly installed and grounded field
wiring poses FIRE and ELECTROCUTION hazards. To
avoid these hazards, you MUST follow requirements
for field wiring installation and grounding as
described in NEC and your local/state/national
electrical codes.
NOTICE
Use Copper Conductors Only!
Failure to use copper conductors could result in
equipment damage as the equipment was not
designed or qualified to accept other types of
conductors.
Verify that the power supply available is compatible with
the unit's nameplate. Use only copper conductors to
connect the power supply to the unit.

Main Unit Power Wiring

WARNING
Proper Field Wiring and Grounding
Required!
Failure to follow code could result in death or serious
injury.
All field wiring MUST be performed by qualified
personnel. Improperly installed and grounded field
wiring poses FIRE and ELECTROCUTION hazards. To
avoid these hazards, you MUST follow requirements
for field wiring installation and grounding as
described in NEC and your local/state/national
electrical codes.
Installation
51