0307SCA0AMEN
19/26
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 6.0
CAUTION:
The gas control operating valve is the prime safety shut-off.
All gas supply lines must be fee of dirt, scale, etc. before
connecting to the air heater thus ensuring positive closure of
the control valve.
8.6 Thermal overheat (limit) controls
If it is determined that the thermal overheat control needs
replacing, use only AmbiRad authorized replacements that are
designed for this appliance.
To gain access to the control, open the controls compartment
access door. Refer to figure 9 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
.
8.7 Combustion air control/switch
If it is determined that the air differential pressure switch needs
replacing, use only AmbiRad authorized replacements that are
designed for the air heater being serviced. These switches are
calibrated to operate at the designed combustion air flow duty
for each appliance size in the product range.
8.8 Combustion 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 hinged controls
compartment access door. refer to figure 9 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.
NOTE:
The combustion air fan motor is lubricated for life. DO NOT
OIL OR GREASE