Technical data

0803UDSA-2GBEN, Pag. 19/36
Operating instructions
and operating sequence
Check installation after
start-up
1. Set thermostat to the lowest setting.
2. Turn off all electric power to the heater.
3. Shut the gas cock at the inlet of the unit.
4. Wait five (5) minutes to clear out any gas. Then smell for gas, including
near the floor. If you smell gas, STOP! and follow the steps in the WARN-
INGS printed on page 3. If you do not smell gas, proceed to the next step.
5. Turn on the electric power to the heater.
6. Open the gas cock at the inlet of the unit.
7. If fitted, ensure that a time switch is set to an ‘ON’ period.
8. Adjust the thermostat to the required setting (must be above current room
temperature).
Note :
If the appliance does not operate, follow the instructions "To turn off gas
supply at the Appliance" printed below and call your service technician.
9. Thermostat calls for heat, energyzing the venter motor.
10. When adequate air flow for combustion is proven by an air proving switch
and a prepurge period has elapsed, the integral ignitor and multifunc-
tional gas control operate. The ignition spark ignites the gas creating the
burner flame.
11. Burner flame is sensed by a flame rod sensor and when the heat exchanger
is warmed up (+/- 30 seconds) and the fan control relay closes, the fan
motor is energized.
12. If the flame is extinguished during the main burner operation, the inte-
grated control system closes the main valve and attempts to relight the
burner. The unit will attempt 5 ignitions before entering a “lock out” mode.
Lock out is indicated by the red warning light on the heater. To end this
mode push on the reset switch.
13. To turn the heater ‘OFF’ for short periods : adjust the room thermostat to
its lowest setting or ‘OFF’. The fan will continue to run to cool the heater
and then switch off automatically.
14. To turn the heater ‘OFF’ for long periods : see ‘To turn off gas supply at
the appliance’ below.
TO TURN OFF GAS SUPPLY AT THE APPLIANCE
1) Set thermostat to the lowest possible setting or ‘OFF’ position.
2) Shut off the gas tap when the fan has stopped.
3) Switch off electric power to the appliance.


 Check gas pressure as described in detail below.


 Turn the unit off and on, pausing 2 minutes between each cycle. Observe for
smooth ignition.


 Set the thermostat to the required room temperature.


 Place this booklet and any control or optional information in an accessible
location near the heater or give this information to the end user.