Trane Axiom GEHB 006, Installation, Operation And Maintenance Manual

Page: 63 / 96

WSHP-SVX01E-EN
63
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
Figure 2, p. 79 .
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
Figure 2, p. 79 . 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.
Table 40. Waterside Economizing
Three-Way Valve
Specifications
Unit Size
60 HZ
Unit
Size
50 HZ
Valve
Conn.
Size
Valve
Pressure
Rating
Valve
Close-off
Pressure
Valve Temp
Range Actuator
GEH
006-015
GEH
006-012
1/2"
FPT
600 psi 200 psi 0
ºF
to 212
ºF
-18ºC to 121ºC
Non-spring return type
24 VAC +/- 20%
135 second stroke time
10 C
v
at full port
GEH
018-042
GEH
015-036
3/4"
FPT
600 psi 200 psi 0
ºF
to 212
ºF
-18ºC to 121ºC
Non-spring return type
24 VAC +/- 20%
135 second stroke time
30 C
v
at full port
GEH
048-060
GEH
042-060
1" FPT 600 psi 200 psi 0
ºF
to 212
ºF
-18ºC to 121ºC
Non-spring return type
24 VAC +/- 20%
135 second stroke time
23 C
v
at full port
GEV/GEH
6 - 7 1/2
Ton
GEV
6 Ton
1 1/4
FPT
600 psi 200 psi 0
ºF
to 212
ºF
-18ºC to 121ºC
Non-spring return type
24 VAC +/- 20%
135 second stroke time
33 C
v
at full port
GEV/GEH
10-15
Ton
GEV/
GEH
7 1/2-12
1/2 Ton
1 1/2"
FPT
600 psi 200 psi 0
ºF
to 212
ºF
-18ºC to 121ºC
Non-spring return type
24 VAC +/- 20%
135 second stroke time
37 C
v
at full port
GEV
20 & 25
Ton
GEV
15 & 20
Ton
2" FPT 600 psi 200 psi 0
ºF
to 212
ºF
-18ºC to 121ºC
Non-spring return type
24 VAC +/- 20%
135 second stroke time
57 C
v
at full port
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.
Economizer Start-Up