Filter
Top Products
Service
Page 18
GAS VALVE REMOVAL
1. Remove burner tray from heater as described in the
Burner Tray Removal section..
2. Disconnect pilot tubing (if removing a Millivolt valve).
3. Disconnect wires to gas valve.
4. Unscrew gas valve from manifold.
5. Reverse above procedure to reinstall.
MAIN BURNER AND ORIFICE REMOVAL
1. Remove burner tray.
2. Remove screws from rear burner hold-down bracket.
NOTE: If the heat exchanger is sooted badly, the
burner hold-down bracket and spacer can become
distorted from direct-flame impingement and this
usually necessitates replacement of these parts.
3. Lift burners from slotted spacers and slide from orifices.
Clean with a wire brush.
4. Orifices usually do not need to be replaced. To clean, run
either copper wire or wood toothpick through orifice. Do
not enlarge hole. To remove orifice, use a socket wrench
and remove from manifold. Do not overtighten when rein-
stalling.
5. Reverse above procedure to reinstall.
Figure 29. Igniter position to burners.
IGNITER REMOVAL AND CLEANING (ELECTRONIC)
1. Disconnect high tension wire from igniter.
2. Remove (2) screws that mount the igniter to the burner
tray.
3. Remove igniter from burner tray.
4. Reverse above procedure to reinstall.
Figure 30. Direct Spark Igniter.
IGNITION CONTROL FAULT CODES
The following ignition control fault codes can be used to
troubleshoot ignition problems:
Steady On - Power applied, control OK.
Steady Off - No power or control hardware fault.
1 Flash - Ignition lockout from too many trials.
2 Flashes - Ignition lockout from too many flame losses
in single call for heat.
3 Flashes - Control hardware/software fault detected.
PILOT REMOVAL AND CLEANING (MILLIVOLT)
Figure 31. Honeywell Millivolt Pilot.
Pilot
Thermopile
A
ir Opening
Orifice