Sequence Operation | Trane WPHF, WPVJ instruction

Sequence

of Operation

Initial Unit Start-up

Start-up for 24V (basic) controls is included below:

Note: Start-up for the TracerTM ZN510 controller may be found in WSHP-IOP-2.

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 temperature control 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 temper- ature (approximately 9°F-12°F); 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 OP1. (Page 27).

5.Turn the thermostat 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°F-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 OP1. (Page 27)

11.Set the thermostat to maintain the desired space temperature.

12.Instruct the owner on system operation.

26	WSHP-SVX04A-EN