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MODU-FIRE® FORCED DRAFT
Gas-Fired Boiler Maintenance
10. Check that gap between the electrode and the
ground rod. It should be 1/8 inch (+1/16, -0).
For Propane, the gap should be exactly 1/8”.
The electrode height is not adjustable. If adjustment
is necessary, only the ground rod should be ad-
justed. Check for cracking of the electrode. Do
NOT overtighten the electrode.
11. Use a soft, clean cloth to remove accumulated
contaminants from the UV detector/scanner
glass envelope.
Ignition Assembly
12. Before re-installing the burner, check the
cleanliness of the heat exchanger and the condi-
tion of the combustion chamber. If corrosion or
leaks are noticed, please call for service.
13. Install the burner and blower assembly. Recon-
nect the green ground wire, ignition wire, high
gas pressure switch wires, the wire plug to the
blower, the two air gas mixer sensing tubes, the
UV scanner, and wires to the back pressure
switch. Before starting the boiler make sure to
reconnect and tighten the gas union!
14. Reinstall all covers.
15. Fire Test the boiler and use a combustion ana-
lyzer to ensure that the fuel/air ratio is set cor-
rectly. If adjustment is required, refer to section
3.12.3.
5.3
REMOVING THE HEAT EXCHANGER
WARNING!
Heat Exchanger is heavy and may cause injury if
improperly handled. Removal of the heat exchanger
should be performed only by knowledgeable and
experienced personnel.
5.4
AFTER ALL REPAIRS OR MAINTENANCE
1. Follow "Pre-Start Check List" (Section 3.10) and
all "Safety Checks" (Section 3.11).
2. Fire the Boiler and perform combustion check.
3. Adjust gas flow if necessary. (See "Gas Pres-
sure Adjustment", Section 3.12.3)
Spark Gap
1/8” +1/16, -0
UV Detector
Ignitition
Electrode
High
Exhaust
Back
Pressure
Switch
26