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electric supply to the air heater provided the air
circulatory fan has stopped.
3) Turn off the gas supply to the air heater.
13.8
IMPORTANT
If the thermal overheat (limit) control requires
resetting & doing so restarts the air heater, wait
until it warms up to thermal equilibrium to ensure
the overheat control does not reactivate and lock
out. If it does and the room air temperature near
the air heater is less than 30
°
C then switch
OFF
the air heater & call for service.
13.9
Air circulation
Some Reznor unit air heaters have fans connected
to a remote override switch. This enables cool air
to be used for circulation purposes when the air
heater is not used for heating purposes e.g. in
summer months.
To use this feature :
a) Switch ON mains electricity supply to the air
heater.
b) Switch ON the manual override switch. This may
be on a remote control panel.
13.10
Maintenance and servicing
Maintenance and service must only be carried
out by competent persons. Periods between
service are dependent upon the local
environment where the air heater is installed.
Regular inspection is recommended initially to
ascertain routine service intervals.
The service instructions in section 8 of this
document suggest that the engineer informs the
user of his findings. Where the installed
environmental circumstance change e.g.
different processes being carried out in a
factory, the service interval should be
reconsidered. If in doubt, ask your installer,
service undertaking or the manufacturer about
inspection and service intervals. The air heater
should be serviced at least once every heating
season. Ensure that any combustion air vents
fitted to the building in which the air heater is
installed are unblocked at all times. Periodically
check to ensure that the outer casing of the air
heater is clean; excessive dust might constitute
a hazard.
13.11
Warning : Never switch off the mains electrical
supply to the air heater unless the mains gas
supply is turned off.
Figure 12:
Lockout reset locations
