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Fig. 15a - Igniter assembly
Fig. 15b : Installing the igniter
7.4 M
ULTI
-
FUNCTIONAL GAS CONTROL VALVE
1. Ensure gas supply to the air heater is turned OFF.
2. After the air circulation fan has stopped, switch OFF the electricity
supply to the air heater.
3. Mark for future identification and disconnect the wires connected to
the valve.
4. Disconnect the gas service union between the control valve and the
gas service tap. Remove the gas control valve.
5. Re-fit a replacement valve making all of the
required
connections.
6. Carry out complete commissioning procedure prior to placing the
appliance back into service as outlined in section 5.0
CAUTION:
The gas control-operating valve is the prime safety shut-off. All gas
supply lines must be free of dirt, scale, etc. before connecting to
the air heater thus ensuring positive closure of the control valve.
7.5 T
HERMAL OVERHEAT
(
LIMIT
)
CONTROLS
If it is determined that the thermal overheat control needs replacing, use
only Reznor authorized replacements that are designed for this
appliance.
To gain access to the control, open the hinged controls compartment
access door. Refer to figure 14 for control locations. The control near the
top of the air heater is a disc type control. The lower one is a capillary
type one with a capillary tube that extends into the heat exchanger area.
To remove the controls, disconnect the wires
leading to them, remove the fixing screws and lift
clear of the inner-casing panel.
NOTE
: The
capillary control is fitted to a bracket. With the
bracket removed from the air heater, remove the
control from the bracket.
When replacing the capillary control be careful
not to damage the capillary tube by kinking.
Make bends with a generous radius (
±
25 mm).
When replacing the disc type control never
manually attempt to operate the disc by pushing
on the disc. Doing so will alter the calibration and
could be hazardous.
7.6 C
OMBUSTION AIR CONTROL PRESSURE
SWITCH
If it is determined that the air differential pressure
switch needs replacing, use only Reznor
authorized replacements that are designed for
the air heater being serviced. These switches are
calibrated to operate at the designed combustion
airflow duty for each appliance size in the
product range.
7.7.C
OMBUSTION AIR FAN
(
VENTER
)
1.
Ensure gas supply to the air heater is turned
OFF
2. After the air circulation fan has stopped,
switch OFF the electricity supply to the air
heater.
3. To gain access to the fan open the controls
compartment access door. Refer to figure 14
for location
4. Mark for future identification and disconnect
the wires connecting the fan motor at the
terminals on the main wiring junction.
5. Remove combustion air fan and clean as
necessary using a wire brush and solvent to
remove sticky residues.
6. Re-assemble and check for free rotation
before proceeding to test the appliance.
