SECTION 11: U
SER
I
NSTRUCTIONS
33
SECTION 11: USER INSTRUCTIONS
11.1 User Instructions
The UHA[X][S] Series heaters are fully automatic
and operate from the external controls fitted on site.
The only user control at the heater is the Manual
Reset Limit Switch -
See Page 33, Section 11.3.1
11.2 Heater Operation
When the heater has been switched on by the
thermostat installed on site, the main burner will
automatically turn on.
The burner control box will control the safe ignition
of the flame.
All heaters require a constant gas and electricity
supply which must not be interrupted during the
normal operation of this heater.
11.3 Common User Controls
11.3.1 Manual Reset Limit Switch
On residentially approved models, the limit
thermostat is located inside the access door of the
heater.
See Page 44, Section 14.3
. This control
protects against excessive heat build-up inside the
burner compartment.
Figure 19: Manual Reset Limit Switch
11.4 Lighting Instructions
11.4.1 To Turn On Heater
1. Ensure that the electrical and gas supplies to
the heater are on. Check that the on site
controls are "ON".
IMPORTANT:
The thermostat setting must be above
the ambient temperature for the heater to operate.
WARNING
Explosion Hazard
Installation, service and annual inspection
must be done by a contractor
q
ualified in
the installation and service of
g
as-fired
heatin
g
e
q
uipment or your
g
as supplier.
Turn off
g
as and electrical supplies before
performin
g
service or maintenance.
Failure to follow these instructions can
result in death, injury or property dama
g
e.
WARNING
Explosion Hazard
Do not make more than one attempt to
restart the heater if manual reset limit switch
locks out.
The vent or heat exchan
g
er may be blocked.
The fault must be traced and repaired.
Failure to follow these instructions can
result in death, injury or property dama
g
e.
Reset Button
To reset manual reset limit switch, press reset
button.
NOTE:
To reset, the switch must be cool.
Description
Part Number
Manual Reset Limit Switch
90412106
