Operating instructions
1104UESAGBEN, page 8/31
6.1 Gas piping &
pressures
WARNING :
Do not over tighten and
do not rotate the gas valve
inside the heater control
compartment.
Table 3
Gas connections
6. MECHANICAL
6.1.1 Gas supply
WARNING : Pressure testing supply piping
Test pressures above 50mbar : Disconnect the heater and manual valve from the
gas supply line which is to be tested. Cap or plug the supply line.
Test pressures below 50mbar : Before testing, close the manual valve on the
heater.
All piping must be in accordance with requirements outlined in the National Gas
Codes (different for each country). Gas supply piping installation should also
conform with good practice and any local codes. Support gas piping with pipe
hangers, metal strapping, or other suitable material. Do not rely on the heater
to support the gas pipe.
All sealing products shall be resistant to the action of liquefi ed petroleum gas or
any other chemical constituents of the gas being supplied.
Install a ground joint union and manual shutoff the gas cock upstream of the
unit control system (see fi gure 3).
The unit is equipped with a nipple that extends outside the cabinet. The gas
connection is 3/4”,
Leak test all gas connections by brushing on a leak detecting solution.
6.1.2 Gas connections
WARNING
All components of a
gas supply system must
be leak tested prior to
placing equipment in
service. NEVER TEST
FOR LEAKS WITH AN
OPEN FLAME. Failure
to comply could result in
personal injury, property
damage or death.
Figure 3
Gas connection
WARNING
This appliance is
equipped for a maxi-
mum gas supply pres-
sure of 50 mbar.
UESA 035 055 083 102
Nat. Gas
3/4" 3/4" 3/4" 3/4"
Propane
6.1.3 Burner gas pressure and 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 sup-
ply 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 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 supply pressure test point( see fi g-
ure 4);
* Adjust the room thermostat to call for heat i.e. above room ambient tempera-
ture;
* Observe the burner gas pressure on the manometer and compare to the stated
pressure on the data plate;
* If necessary, adjust the burner gas pressure. Remove the cover screw. Turn
the regulator screw anti-clockwise to decrease pressure or clockwise to in-
crease pressure (see fi gure 4);
* Set room thermostat to lowest setting to turn OFF the burners. Replace the test
point screw/cap and with the main burner OFF, test for gas soundness using a
leak detector fl uid.
Reset temperature control/room thermostat to comfort operating level.