Unit installation

User, Installation and Service Manual for F1 Gas Unit Heaters 17
Ed. 05/2009
Note: The control cables (specially those linked to the remote control and to the temperature
probe) must be kept far away from electrical cables this can be done using e.g shielding or
separate pipes for the two types of cables.
BURNER PRESSURE ADJUSTMENT
For correct operation, the burner pressure must be as given in table n°5, n°6 and n°7. The burner
gas pressure of each unit is set at the factory and is shown by the labels on the package and by a
label inside the control panel of each unit.
In the case the pressure adjustment is necessary keep in mind that:
- Natural Gas: the pressure is to be adjusted by turning the adjustment screw A (figure 14)
- LPG: the adjustment screw is to be screwed down completely to the stop in order to put the
pressure regulator out of operation. The reduction of the pressure from the mains is possible by
adjusting the low pressure governor installed on the gas supply line (see section 3 – General
rules for unit installation - page 6 item E).
Before adjustment of the burner pressure identify TYPE OF THE GAS VALVE installed in the
appliance (see figure 14), than proceed as following:
- Connect the manometer to the gas pressure tap E after unscrewing valve setting screw;
- Turn on the appliance;
- Turn clockwise/counterclockwise the setting screw A in order to set the required pressure value.
When LPG gas used turn completely the setting screw A, and if the pressure needs an ulterior
correction adjust the low pressure gas governor.
- Disconnect the manometer and close the gas tap by tightening adjustment screw.
- Two or three times turn on and turn off appliance to verify the correct and stabile adjustment.
- If necessary it’s possible to check the inlet pressure from the gas tap B.
WARNING!
• After setting the gas pressure, stop and start the unit, and check that burner pressure has
stabilised. If necessary perform a new adjustment.
• After completing the gas pressure adjustment, seal the valve setting screw.
• Check the gas leakage using the water/soap foam or other suitable method.
BURNER PRESSURE SETTING TABLE MODELS SERIES F1
SUPPLIED WITH NATURAL GAS (G20) (GAS SUPPLY PRESSURE 20 mbar)
F1 21 F1 31 F1 41 F1 51 F1 61 F1 81
Burner Pressure (mbar)
(mmH
2
O)
10,5
107
9,3
95
9,6
98
8,0
81
8,3
85
7,0
71
CO
2
in flue (%)
8,6 – 9,4 8,8 – 9,2
CO in flue (ppm)
0 - 30
Table 5
BURNER PRESSURE SETTING TABLE FOR UNITS
SUPPLIED WITH LPG (G30) BUTANE OR COMMERCIAL MIX (SUPPLY PRESSURE 30 mbar)
F1 21 F1 31 F1 41 F1 51 F1 61 F1 81
Burner Pressure (mbar)
(mmH
2
O)
28,5
290
28,5
290
28,5
290
27,8
283
28,0
285
26,5
270
CO
2
in flue (%)
10,2 – 11,0 10,5 – 11,0
CO in flue (ppm)
0 - 30
Table 6