Reznor RPB - Spark Ignition System Maintenance

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RPB-IOM (06-22) 131782-B
MAINTENANCE—CONTINUED
Maintenance Procedures—Continued
Spark Ignition System Maintenance
⚠ WARNING ⚠
Due to high voltage on pilot spark wire and pilot electrode, do not touch when energized.
NOTE: When checking for spark with the pilot burner assembly removed from the burner rack, the
pilot assembly must be grounded to the heater for proper spark.
1. If no spark occurs, check the following:
a. Using microampmeter, measure voltage between terminals TH and 7 on ignition controller. Voltage should
be at least 20V and no higher than 32V. Refer to TROUBLESHOOTING section if no voltage is observed.
b. Check for short to ground in high tension lead and/or ceramic insulator.
c. Verify that pilot spark gap (see Figure 23) is approximately 7/64 inch.
d. If the above conditions are normal and no spark occurs, replace the ignition controller.
NOTE: If replacing an earlier model of ignition controller (see Figure 24), order a replacement kit
(PN 257472 for a unit with recycling gas control option AH2 or PN 257473 for a unit with gas control
with lockout option AH3). Option codes are listed on the unit wiring diagram.
Figure 24. Obsolete Ignition Controllers
2. If the main gas valve fails to open with a normal full-size pilot flame established, check the following:
a. If voltage between black and brown leads on main gas valve is 20–32 VAC and there is no main gas flow with
built-in manual valve in FULL OPEN position, main valve is defective.
b. If there is no voltage between black and brown leads on main gas valve, check for disconnected or shorted
flame sensor lead or flame sensor probe.
3. If the above conditions are normal and main gas flow is still off, the ignition controller is probably defective. Do
not attempt to service the ignition controller as it does not contain any replaceable components.
IGNITION CONTROLLER WITH
LOCKOUT FOR GAS CONTROL
OPTION AH3, UTEC MODEL 1003-514
(PN 257010): REPLACE WITH
REPLACEMENT KIT (PN 257473)
RECYCLING IGNITION CONTROLLER
FOR GAS CONTROL OPTION AH2,
UTEC MODEL 1003-638A
(PN 257009): REPLACE WITH
REPLACEMENT KIT (PN 257472)