Internal Auxiliary Electric Heat
Installation, Operation & Maintenance Instructions
Revision 1/99
Overview
The GT-G Series Auxiliary Electric Heat mounts internally on
any GT-G upflow (Figure 1) or downflow unit and mounts
directly on the blower outlet of all horizontal GT-G units
(Figure 6). Note the model compatibility Table 2. Horizontal
units are rated for zero clearance at the unit and 1" clearance
for first three feet of duct, vertical units rated for zero clearance
for both unit and duct. Downflow units can not be located
directly over a discharge register. The discharge plenum must
make a 90
°
turn after leaving the unit and be constructed from
non combustible material. The GT-G electric heat contains a
four stage relay control board which activates the elements
directly via an internally wired low voltage harness. Low
voltage signals (W1 and W2) are staged from the CXM or
DXM control of the GT-G unit. It should be noted that only
distributor model GT-G units are prewired for low voltage
control of the electric heat. Carrier Tech Support should
be contacted for use on all other models.
Vertical Upflow or Downflow Installation
1.
Disconnect power to the unit
2.
Remove blower access panels.
3.
Clip wire-tie holding electric heat low voltage 3-wire
harness to discharge panel stiffener. Refer to Figure 1.
4.
Remove blower mounting screws and then drop down
blower assembly as shown in Figure 2. Removal of blower
wires should not be necessary.
5.
Install electric heat in discharge flange where blower
assembly has been removed using provided screws as
shown In Figure 3.
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Auxiliary electric heat
power supply knockout
opposite air coil
Electric Heat Assembly
Air Coil
Low Voltage control
harness is prewired
on all distributor class
Genesis
Remove screws &
drop blower
Locate electric heat assembly
on pins in discharge panel
and insert screws
Relocate blower in electric
heat assembly in same
manner
Figure 2. Blower removal.
Figure 3. GT-G electric heat mounting and blower
re-installation.
Figure 1. Typical vertical unit installation.
Note: For AGM electric heaters remove control box from
houseing by removing the control box cover and then removing
the four (4) screws (do not discard) that hold the control box to
the housing. Allow the control box to hang on the wire tie
located in the housing flange. After completing step 5 replace
the control box on the housing.
GT-G Series
®
