Economizer Start-Up; Start-Up Sequence - Trane Axiom GEHB 006 Installation, Operation And Maintenance Manual

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
WSHP-SVX01E-EN

Economizer Start-Up

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