WSHP-SVX014F-EN
45
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
.
N
No
otte
e:: 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
.
N
No
otte
e:: 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.
Table 31.
Waterside economizing three-way valve specifications (DXHF/DXVG units)
Unit Size
Valve Conn. Size
Valve Pres.
Rating
Valve Close-off
pressure
Valve Temp.
Range
Actuator
DXHF/DXVG 024
3/4 FPT
600 psi
200 psi
0ºF to 212ºF
-18ºC to 121ºC
Non-spring return
type 24 Vac +/- 20%
135 second stroke
time 24 Cv at full port
DXHF/DXVG 036-
070
1 FPT
600 psi
200 psi
0ºF to 212ºF
-18ºC to 121ºC
Non-spring return
type 24 Vac +/- 20%
135 second stroke
time 30 Cv at full port
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 32.
Waterside economizing three-way valve specifications (EXHF/EXVG units)
Unit Size
Valve Conn. Size
Valve Pres.
Rating
Valve Close-off
pressure
Valve Temp.
Range
Actuator
EXHF 006-015
1/2 FPT
600 psi
200 psi
0°F to 250°F -18°C
to 121°C
Non-spring return
type 24 Vac +/- 20%
135 second stroke
time 10 Cv at full port
EXHF 018-036 EXVG
009-024
3/4 FPT
600 psi
200 psi
0°F to 250°F -18°C
to 121°C
Non-spring return
type 24 Vac +/- 20%
135 second stroke
time 24 Cv at full port
