1403BSHH_AMEN,page 17/29
9.4
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:
o
Ascertain from the heater’s data plate the correct
operating gas pressure;
o
Turn the room thermostat control to its lowest
setting;
o
Connect a manometer to the test point on the gas
manifold;
o
Adjust the room thermostat to call for heat i.e. above
room ambient temperature;
o
Observe the burner gas pressure on the manometer
and compare to the required pressure on the data
plate;
o
If necessary, adjust the burner gas pressure. Remove
the cover screw. Turn the regulator screw anti-
clockwise to decrease pressure or clockwise to
increase pressure (see figure 13). Adjusting the burner
pressure may only be carried out by suitably qualified
persons.
o
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 fluid.
Reset temperature control/room thermostat to comfort
operating level.
Figure 13: Honeywell gas valve
1) Gas
inlet
2) Gas
outlet
3) Inlet pressure tap
4) Outlet pressure tap
5) 6.3mm AMP terminals and screws for wiring
6) 6.3mm AMP terminals
7) Earth terminal/screw (line voltage models only)
8) Pressure regulator adjustment screw
Table 5 : Burner jets and pressures
055
083
102
Burner jet
dia
6,80
7,60
8,40
Burner pressure
mbar
8,30
10,40
8,80
inlet pressure
20 mbar
Burner jet
dia
4,50
4,50
5,60
Burner pressure
mbar
15,70
34,36
23,50
inlet pressure
37 mbar (*)
BSHH
Nat Gas
G20
Prop Gas
G31
