Installation
WSHP-SVX01W-EN
65
Waterside Economizer Installation for GEH
and GEV 6 to 25 Ton Models
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could
result in death or serious injury. Disconnect all electric
power, including remote disconnects before servicing.
Follow proper lockout/tagout procedures to ensure the
power can not be inadvertently energized.
WARNING
Proper Field Wiring and Grounding
Required!
Failure to follow code could result in death or serious
injury. All field wiring MUST be performed by qualified
personnel. Improperly installed and grounded field
wiring poses FIRE and ELECTROCUTION hazards. To
avoid these hazards, you MUST follow requirements for
field wiring installation and grounding as described in
NEC and your local/state electrical codes.
1. Remove the filter frame from the unit.
2. Remove the waterside service panel from the unit.
3. Remove the control box service panel from the unit.
4. Remove the economizer and miscellaneous mounting
parts from it’s packaging.
5. GEV ONLY: Mount the economizer support angle (4475
1637 0100) found in the economizer packaging in the
same holes of the return air filter frame removed in
Step 1. The support angle screws into the unit roof.
6. GEV ONLY: Hang the economizer assembly from the
economizer support angle mounted in Step 5.
7. Secure the economizer to the unit using the four plates
(4475 1630 0100) found in the economizer packaging.
Two plates should be applied to each economizer side.
GEV ONLY: Secure the bracket on the bottom of the
economizer cabinet to the unit compressor
compartment center post.
8. Install the field portion of the water piping and the 3-
way valve together.
9. Verify the control board for the waterside economizer
is located at the back of the control box. The
temperature rating of this board is factory set to 55ºF.
10. Thread the economizer’s entering water temperature
sensor (4RT1) through the water-in line of the water-
source heat pump upstream from the valve. This
sensor is used by the economizer’s 3-way valve to
determine if water flow should be directed through the
waterside economizing coil.
11. Tie wrap the thermistor to the water line (supply side)
upstream of the water pipe to the economizer. The
thermistor must be situated so that the thermistor is
capable of reading the actual entering water
temperature regardless of the economizer’s on or off
situation.
12. Insulate the thermistor with tubing insulation.
13. Tie wrap each end of the tubing insulation to prevent
air filtration. The tie wraps and insulation are located in
a bag and shipped inside of the unit.
14. Thread the factory wire harness through the low
voltage hole of the heat pump to the 3-way valve’s wire
harness.
15. Connect the factory installed wire harness to the to the
wire harness supplied with the 3-way valve (see
Table 46. Actuator/factory harness wire table
Actuator Wire # Color
Factory Harness Wire # Color
1 BLK
=
25L-Black
2 WHT
=
23T-White
3 WHT
=
73A-White
16. Bundle excess valve wire, and wire tie the bundle
neatly.
17. Install control side service panel to the heat pump.
18. Install the unit filter frame to the economizing inlet.
19. Insulate the economizing piping package with field
supplied pipe insulation. Insulating the piping will help
stop condensation from forming on the pipe.
Notes:
•
Trane does not provide insulation on the economizing
piping package. This insulation must be field provided
and field installed.
•
Trane does not provide condensate overflow
protection of the waterside economizer. This must be
field provided and field installed.
20. Install waterside service panel to the heat pump.
The economizer condensate line must be trapped prior to
the unit’s drain line. This helps prevent air from being
sucked through the drain line causing condensate to spit
or build-up in the economizer or unit drain pans. Field pipe
the drain lines of the waterside economizer and water-
source heat pump together prior to installing a condensate
trap. See Condensate Drain Connection for proper
trapping of condensation.
Summary of Contents for Axiom EXH Series
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