Roberts Gorden Combat UHD[X][S][R] 75 - Manual (Page 32)

UHD L OW P ROFILE D UCT F URNACE I NSTALLATION O PERATION AND S ERVICE M ANUAL
26
SECTION 11: USER INSTRUCTIONS
11.1 User Instructions
The UHD[X][S][R] 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 26, 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
The limit thermostat is located inside the access
door of the heater. See Page 37, Section 14.3. This
control protects against excessive heat build-up
inside the burner compartment.
Figure 15: 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.
2. The automatic firing sequence will begin as
described on Page 24, Figure 13. The heater
will now operate automatically under the control
of the on site controls.
WARNING
Explosion Hazard
Installation, service and annual inspection
must be done by a contractor qualified in
the installation and service of gas-fired
heating equipment or your gas supplier.
Turn off gas and electrical supplies before
performing service or maintenance.
Failure to follow these instructions can
result in death, injury or property damage.
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 exchanger may be blocked.
The fault must be traced and repaired.
Failure to follow these instructions can
result in death, injury or property damage.
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