Roberts Gorden UHD[X][S][R] 75 User Instructions, Reset Limit Switch - See Page 26, Section

UHD LOW PROFILE DUCT FURNACE INSTALLATION OPERATION AND SERVICE MANUAL

SECTION 11: USER INSTRUCTIONS

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.

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.

11.3Common User Controls 11.3.1 Manual Reset Limit Switch

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.

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

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

11.4Lighting 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.

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