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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 to 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
"Operating Pressures," p.
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.
Table 29. Waterside economizing three-way valve specifications (DXHG/DXVG units)
Unit Size
Valve Conn. Size
DXHG/DXVG 024
DXHG/DXVG 036-070
Note: The valve body is constructed from forged brass with nickel plating, with the ball and stem constructed of stainless steel. For other information pertaining to
the economizing water valve, see the valve's data plate.
Table 30. Waterside economizing three-way valve specifications (EXHG/EXVG units)
Unit Size
Valve Conn. Size
EXHG 009-015
EXHG 018-036 EXVG
009-024
44
52.
Valve Pres. Rating
600 psi
3/4 FPT
600 psi
1 FPT
Valve Pres. Rating
600 psi
1/2 FPT
600 psi
3/4 FPT
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 to 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
"Operating Pressures," p.
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.
11. Set the thermostat to maintain the desired space
temperature.
12. Instruct the owner on system operation.
Valve Close-off
Valve Temp. Range
pressure
0ºF to 212ºF
200 psi
-18ºC to 121ºC
0ºF to 212ºF
200 psi
-18ºC to 121ºC
Valve Close-off
Valve Temp. Range
pressure
0°F to 250°F -18°C to
200 psi
121°C
0°F to 250°F -18°C to
200 psi
121°C
52.
Actuator
Non-spring return type
24 Vac +/- 20%
135 second stroke time
24 Cv at full port
Non-spring return type
24 Vac +/- 20%
135 second stroke time
30 Cv at full port
Actuator
Non-spring return type
24 Vac +/- 20%
135 second stroke time
10 Cv at full port
Non-spring return type
24 Vac +/- 20%
135 second stroke time
24 Cv at full port
WSHP-SVX014J-EN
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