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64 WSHP-SVX01D-EN
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 7 on page 75. 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.
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 7 on page 75. 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 boil-
erless controls returns the unit to normal operation.
11 Set the thermostat to maintain the desired space temperature.
12 Instruct the owner on system operation.
Installation
Waterside Economizer