Waterside Economizer Start-Up Sequence - Trane GEHE 072-180 Installation, Operation And Maintenance Manual

Waterside Economizer Start-Up Sequence

1. Set the thermostat to the highest position.
2. Set the thermostat system switch to COOL with the fan
control to AUTO.The compressor should NOT run.
3. Reduce the thermostat setting until the compressor,
reversing valve, solenoid valve, and loop pump are
energized. Adjust water flow utilizing pressure/
temperature plugs and comparing to tables contained
in specification sheet data. Water leaving the heat
exchanger should be warmer than the entering water
temperature (approximately 9-12ºF); blower operation
should be smooth; compressor and blower amps
should be within data plate ratings; the suction line
should be cool with no frost observed in the refrigerant
circuit.
4. Check the cooling refrigerant pressures against values
in Table 53, p. 88.
Note: If cooling mode is activated, and the entering water
temperature of the heat pump falls below 55ºF , the
2-position, water side economizing valve will
become energized (open) and compressor
operation will halt allowing for free cooling in the
space.
5. Turn the thermostat system switch to the OFF position.
Unit should stop running and the reversing valve
should de-energize.
WSHP-SVX01Q-EN
6. Leave unit off for approximately FIVE minutes to allow
for pressure equalization.
7. Turn the thermostat to the lowest setting.
8. Set the thermostat system switch to the HEAT position.
9. Adjust the temperature setting upward until the unit is
energized. Warm air should blow from the register. A
water temperature decrease of approximately 5-9°F
leaving the heat exchanger should be noted.The
blower and compressor operation should be smooth
with no frost observed in the refrigeration circuit.
10. Check the heating refrigerant pressures against values
in Table 53, p. 88.
Note: For units with boilerless electric heat option: In
heating mode, if the entering water temperature of
the heat pump falls below 45ºF , the electric heater
will be energized, and compressor operation will
halt. Once the entering water temperature rises
above 50ºF , the boilerless controls returns the unit
to normal operation.
11. Set the thermostat to maintain the desired space
temperature.
12. Instruct the owner on system operation.
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