2
2. If the cabinet front is screwed to the chassis, remove the 1/4”
screw (or screws) located behind the inlet grille. Pull the inlet
grille forward from the top of the grille to access screw(s).
3. Remove cabinet front from chassis by tilting the bottom of the
front forward, lifting slightly up and forward.
4. If a remote thermostat or any low voltage accessory is being
used, remove the low voltage pin connector from the low
voltage terminal strip. If a previous version board is being
replaced, remove wires from the low voltage terminal strip.
1
2
3
ON
PULL TO REMOVE
THERMOSTAT KNOB
Lift Off
PULL TO REMOVE
MODE SWITCH KNOB
ESCUTCHEON
SCREW (2)
SCREW
Figure 2
5. Remove knobs and escutcheon.
6. Remove the two mounting screws, one on each side of
control board cover. Some models may have a screw on
the lower right side of the control panel that will need to be
removed. Tilt control panel out and remove cover.
7. Remove the wires from the board in the unit, including
Thermistor Sensors if they plug into the board.
8. Remove the four screws holding the board and remove the
old board.
NEW CONTROL BOARD INSTALLATION
PROCEDURES
9. If existing unit has a remote mounted “o board” transformer
for board power, proceed to Step 13.
10. Lift the control panel up so the control panel is free of its
hinges. Orient the control panel so there is easy access for
mounting components to the inside of the control panel.
11. Using the two #8 screws that are provided, screw the
transformer that was provided with the kit to the control panel
in the transformer mounting holes provided in the panel. See
Figure 3.
12. The external transformer will come with the Black wires
connected to the LOAD terminal of the transformer (LOAD
terminals are the low voltage terminals) and the Gray wire
connected to the COM terminal on the transformer. The
additional Gray wire will need to be connected to the 230 or
265 volt tap on the transformer. Place the control panel back
on its hinges.
Refer to the serial plate for voltage information.
13. Install the new board and reinstall the screws removed in
step # 8.
Refer to appropriate wiring diagram
beginning on page 11 for proper wiring.
If unit has a 2 speed relay, Remove
the relay and all wires associated with it from the unit.
14. Using the insulated terminals connect the two (2) Black wires
from the Load terminals on the transformer to the “24VAC
Transformer” terminals on the control board. See Figure 4.
15. Connect the Gray wire from the COM terminal on the
transformer to line 2 on the control board. Connect the
additional Gray wire from the 230 or 265 volt tap on the
transformer to line 1 on the control board.
Figure 3
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