National Comfort Product CPG41238-U Series Installation manual - Caution
Installation Guide for Comfort Pack (CPG) Units
26
Figure 7
DUE TO HIGH VOLTAGE ON THE SPARK WIRE
AND ELECTRODE, DO NOT TOUCH WHEN
ENERGIZED. SEE HAZARD LEVELS, PAGE 3.
!
CAUTION
DSI Integrated Control Module - The module monitors the
operation of the heater including ignition. The only replaceable
component is the 3 amp fuse. If the fuse is blown, the problem is
most likely an external overload. Correct the problem and replace
the fuse. Do not attempt to disassemble the control module.
However, each heating season check the lead wires for insulation
deterioration and good connections.
Proper operation of the direct spark ignition system requires
a minimum flame signal of 1.0 microamps as measured by a
microammeter.
For further information and check out procedure on the direct
spark ignition system, refer to the circuit board manufacturer’s
instructions supplied with the heater.
Venter Motor and Wheel Assembly
Remove dirt and grease from the motor casing. Venter motor
bearings are permanently lubricated. The DSI Integrated Control
Module controls and monitors operation of the venter motor. If
the contacts fail to close the venter motor will not run. If the
contacts fail to open, the venter motor will not shut off, preventing
the combustion air pressure switch from opening.
Follow these instructions for replacement of the venter motor
and wheel assembly. Keep all hardware removed to be used in
reassembling and installing the replacement parts.
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 their terminal block
connections.
4. Holding the motor, remove the three 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.
6. Follow the wiring diagram to connect the venter wires.
7. Restore power to the heater and turn on the gas. Light,
following the instructions plate. Check for proper operation.
Replace the access panel.
Limit Control
If it is determined that a limit control needs replacing, use only
the factory-authorized replacement part that is designed for
the size of heater. The limit control is accessible in the control
compartment. For approximate limit control location (see
Figure 1).
Gas Valve
The gas valve requires no field maintenance except careful
removal of external dirt accumulation and checking of wiring
connections. Instructions for testing pressure settings are in
paragraph entitled “Gas Piping and Pressures.
THE OPERATING VALVE IS THE
PRIMARY SAFETY SHUTOFF. ALL GAS
SUPPLY LINES MUST BE FREE OF DIRT
OR SCALE BEFORE CONNECTING
TO THE UNIT TO ENSURE POSITIVE
CLOSURES. SEE HAZARD INTENSITY
LEVELS, PAGE 3.
!