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 assem-
bly. 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
1/8” Outlet
Pressure Tap
NOTE:
Operational pressure
settings and instructions for
checking pressure settings
are in Paragraph 7.1.3.
FIGURE 33 - Pressure
Tap for Checking Gas
Flow Shutoff
Single-Stage
Valve
Carefully remove external dirt accumulation and check wiring connec
-
tions.
The combination gas valve must be checked annually to ensure that the
valve is shutting off gas flow completely.
Instructions
:
1) Locate the 1/8” NPT pressure tap on the combination valve.
2) With the manual valve turned off to prevent flow to the gas valve, con
-
nect a manometer to the 1/8” outlet pressure tap in the valve.
NOTE
: A
manometer (fluid-filled gauge) is recommended.
3) Turn the manual valve to the ON position and the heater OFF. Use
your finger to fully block the main burner orifice for several seconds.
Observe the manometer with the orifice 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 43, 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-
authorized replacement part that is designed for the size of heater.
For approximate limit location, see
FIGURE 28
, page 43.
Form I-UEAS, P/N 221232 R6, Page 45
