Installation manual

1. Turn off the gas and disconnect the electric power.
2. Open the burner/control compartment access panel.
3. Disconnect the three venter motor wires at the DSI control, capacitor wires at
the capacitor (if applicable), and ground screw (located on the control panel).
4. Holding the venter motor, remove the six screws that attach the venter motor
mounting plate to the venter housing. Remove the motor and wheel assembly
from the heater.
5. Re-assemble with the replacement venter motor and wheel assembly. See
FIGURE 32. If the motor plate gasket is damaged, it must be replaced.
6. Follow the wiring diagram to connect the venter wires.
7. Replace the access panel. Restore power to the heater and turn on the gas.
Light, following the instructions on the lighting instruction plate. Check for
proper operation.
FIGURE 32 - Venter
Wheel Position on Shaft
1/2” (13mm) from
motor plate to wheel
Venter
Motor
Venter Wheel
Motor Plate with Gasket
Replacement Instructions
WARNING
The operating valve
is the prime safety
shutoff. All gas
supply lines must be
free of dirt or scale
before connecting
to the unit to ensure
positive closure. See
Hazard Levels, page
2.
12.2.7 Operating Gas
Valve
NOTE: Operational pressure settings and instructions for checking pressure set-
tings are in Paragraph 7.1.3.
FIGURE 33 - Pressure
Tap for Checking Gas
Flow Shutoff
1/8” Outlet
Pressure Tap
Top Views of Two Styles of
Valves used on UEAS Units
Carefully remove external dirt accumulation and check wiring connections.
The combination gas valve must be checked annually to ensure that the valve is
shutting off gas ow completely.
Instructions:
1) Locate the 1/8” NPT pressure tap on the combination valve.
2) With the manual valve turned off to prevent ow to the gas valve, connect a
manometer to the 1/8” outlet pressure tap in the valve. NOTE: A manometer
(uid-lled gauge) is recommended.
3) Turn the manual valve to the ON position and the heater OFF. Use your
nger to fully block the main burner orice for several seconds. Observe the
manometer with the orice blocked, and if any pressure is indicated, the gas
valve is leaking. A leaking gas valve must be replaced before the heater is
put back in operation
12.2.8 Combustion Air Pressure Switch
See FIGURE 28, page 39, for location. If it is determined that the pressure switch
needs replacing, use only the factory-authorized replacement part that is designed
for the model and size of heater being serviced.
Pressure
Switch
Limit
Control
12.2.9
Limit Control
If it is determined that the limit control needs replacing, use only a factory-autho-
rized replacement part that is designed for the size of heater.
For approximate limit location, see FIGURE 28, page 39.
1/8”
Outlet
Pressure
Tap
12.2.10 Door Switch
If it is determined that the door switch needs replacing, use only a factory-autho-
rized replacement part that is designed for the heater.
Door
Switch
Form I-UEAS, P/N 221232 R11, Page 41