Reznor OH Unit Installation Manual - Manual (Page 23)

Form I-OH, PN 120390 R5, Page 23
Gap -
1/8” (3.1mm)
Electrode
Nozzle
0 to 1/16”
(1.6mm) ahead
7/16” (11mm) above
ELECTRODE
ADJUSTMENTS
FIGURE 28 -
Electrode Adjustment
(Front and Side
Views)
Servicing/Replacing Spark
Electrodes - Remove any
carbon formation on the spark
electrodes. Check the elec-
trodes for deterioration and the
insulators for cracks or dam-
age. Replace the electrode
assemblies if any damage or
deterioration exists.
After service or replacement,
check the position of the elec-
trodes. Adjust the electrode
location precisely as illus-
trated.
4) When cleaning/service is completed, place the mounting plate gasket (NOTE: If
gasket is damaged it should be replaced.) on the studs. Align the burner mounting
plate with the bolts and slide the tube into the heater. Attach the mounting plate
with the three nuts.
5) Reconnect the yellow wires to the ignition controller.
9.2.3 Removing Fuel Line Assembly to Service Nozzle and Spark
Electrodes
In order to service the oil nozzle and spark electrodes, it is necessary to remove the
fuel line assembly.
Instructions for Removing Fuel Line Assembly
1. Loosen the connection nut (where line connects to the burner) one or two turns.
2. Disconnect the fuel connection assembly by loosening the 5/16" inverted flare fit-
ting. Pull the fuel connection assembly clear of the burner housing.
3. Remove the two screws retaining the spark transformer cover to the burner hous-
ing. Lift the hinged transformer to its open position.
4. The fuel line assembly may now be removed. Pull the assembly up slightly and
toward the rear of the burner housing.
Oil Nozzle Replacement -- With the fuel line assembly removed, use a box wrench to
remove the oil nozzle. Replace the oil nozzle with a factory-authorized replacement.
See table below for nozzle selection. Do not substitute nozzles.
TABLE 12 - Replacement Burner Nozzle and Pump Pressure
Size Reznor P/N Delavan Nozzle Type Pump Pressure
95 32437 0.85, 80 ° , B 100 lbs
140* 146815 1.25, 70 ° , B 100 lbs
190* 146816 1.35, 70 ° , B 150 lbs
*These replacement nozzle sizes apply to heaters manufactured beginning 6/96.
Always check the nozzle for size and replace with an identical nozzle.
When replacing the nozzle, inspect electrodes and check electrode adjustment before
reassembling the heater.
9.2.4 Cleaning Exterior Surfaces of the Combustion Chamber/Heat
Exchanger and Air Moving Device
To gain access to the front of the combustion chamber/heat exchanger assembly,
remove the discharge louvers. To access the rear side, remove the fan assembly. To
remove the fan, disconnect the wiring in the fan junction box and the flexible conduit.
Refer to FIGURE 29.
Use a stiff brush and a shop vac to clean the accumulated dust and dirt from the exte-
rior surface of the combustion chamber and the heat exchanger.
WARNING: Turn off
the electric power
before cleaning the
heater.
WARNING: Turn
off electric power
before inspecting
or cleaning this
heater.