1801UDSBD-4E,--EN, Pag. 16/35
Operating instructions and operating sequence
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 WARNINGS 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).
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 multifunctional gas control op-
erate. 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 op
-
eration, the integrated 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 informa
-
tion in an accessible
location near the heater or give this information to the
end user.
Check installation after start-up
Burner gas pressure adjustment
The gas pressure is set for the required heat input before the
appliance leaves the factory. Provided that the gas supply
to the air heater is in accordance with the supply pressure
described on the appliance data plate, the operating pressure
will not require adjustment. To check the pressure use the
following procedure:
* Ascertain from the heater’s data plate the correct operating
gas pressure;
* Turn the room thermostat control to its lowest setting;
* Remove the screw from the burner pressure test point of
the multi-functional control valve. Connect a manometer
to the test point( see figures 9 & 10);
* Adjust the room thermostat to call for heat i.e. above room
ambient temperature;
* Observe the burner gas pressure on the manometer and
compare to the required pressure on the data plate;
* If necessary, adjust the burner gas pressure. Remove
the cover screw (models 035-4E- >100-4E) or cover cap
(models 011-4E->030-4E). To adjust low fire, use the lower
copper ring - to adjust high fire, use the upper plastic ring;
* Set room thermostat to lowest setting to turn OFF the burn
-
ers. Replace the test point screw/cap and with the main
burner OFF, test for gas soundness using a leak detector
fluid.
Reset temperature control/room thermostat to comfort
operating level.
