Blower Motor Speed-Tap Retrofit; Relay Location; Wiring Change; Service Access Panel - Trane Axiom GEHB 006 Installation, Operation And Maintenance Manual

Blower Motor Speed-Tap
Retrofit
Note: (for 1/2 Through 5 Ton Units
ONLY)
Motors installed in the unit include 4-
speed and 3-speed configurations.
All voltages include a 4-speed
configuration, with the exception of
380V, 415V, 460V which contain a 3-
speed arrangement and 575V which
contains a 2-speed arrangement. To
modify the rpm of the motor, the
following steps may be followed.
WARNING
Hazardous Voltage!
Disconnect all electric power,
including remote disconnects before
servicing. Follow proper lockout/
tagout procedures to ensure the
power can not be inadvertently
energized. Failure to disconnect
power before servicing could result
in death or serious injury.
WARNING!
Grounding Required!
Follow proper local and state
electrical code on requirements for
grounding. Failure to follow code
could result in death or serious
injury.
1. Remove service access panel at
the unit front.
Figure 64.

Service access panel

2. Find the blower motor relay. The
relay is highlighted below. The
relay location is consistent in all
control configurations.
58
Installation
Figure 65.

Relay location

3. For units w/o Hot Gas Reheat
Remove undesired speed-tap
wire from 1K4 relay at spade 3.
Wire tie the lead, to eliminate a
short.
For units with Hot Gas
Reheat Remove undesired
speed-tap wire from 1K8 relay at
spade 6. Wire tie the lead, to
eliminate a short.
Figure 66.

Wiring change

4. For units w/o Hot Gas Reheat
Select desired speed-tap wire.
Connect desired speed tap wire
to 1K4 relay at spade 3.
For units with Hot Gas
Reheat Select desired speed-tap
wire. Connect desired speed tap
wire to 1K8 relay at spade 6.
Figure 67.
5. Install service front panel.
Reconnect power to the unit.
Figure 68. Service access panel
Table 35. 4-Speed Motor (115, 208, 230,
265)
Lead Colors
Lead Black Blue Orange
Speed High Medium Medium
High Low
Table 36. 3-Speed Motor (380, 415, 460)
Lead Colors
Lead Black Blue
Speed High Medium
Table 37. 2-Speed Motor (575)
Lead Colors
Lead Black Blue
Speed High Low
Note: When using the medium or
low speed tap, the purple
wire must be jumpered to the
high speed tap (blk).
WSHP-SVX01E-EN
Red
Low
Orange
Low