GAS PRESSURE ADJUSTMENTS WITH HONEYWELL VK 05 VALVE
All boilers are tested and calibrated in the factory. At first ignition it is necessary to check and set up the
boiler to adapt it to the system characteristics. The gas pressure at the burner must be checked through the
pressure plug placed on the pipe coming out from the gas valve and by using a water column pressure gauge
or a micro-manometer. The values must be those indicated in the specific table. When all calibrations have
been completed, close and seal the pressure plug used. Calibration of the slow ignition is electronically done
and is adjustable (for optimising and for gas type conversion) by the trimmer RLA on the electronic board.
The necessary thermal output for the heating system can be regulated by acting on the trimmer R.MAX. By
removing the JP bridge, the waiting time for boiler restarting can be varied, after its stop when reaching the
temperature selected on the heating potentiometer. (bridge off: ,5 minutes)
MODULATION MAXIMUM PRESSURE ADJUSTMENT
●
remove the protecting cover G
●
place the “function selector” on TEST position
●
tighten (to increase) or untighten (to decrease) the adjustment bolt H
MINIMUM PRESSURE ADJUSTMENT
After the maximum pressure adjustment has been completed proceed with the following operations:
●
disconnect the power wire ( V) from the modulation coil
●
tighten (to increase) or untighten (to decrease) the adjustment bolt I
●
connect again the modulation coil power wire ( V) (“function selector” must always be on TEST position)
●
replace the protecting cover G
Once adjustments have been effected, replace “function selector” on Summer or Winter.
JP4
JP1
JP3
JP2
JP5
RLA
R max.
Adjustment trimmer RLA
Adjustment trimmer R. MAX
Note: “Function selector” places on “TEST” only for combustion test. This function stops gas pressure on
maximum output for 5 minutes.
For this calibration it is necessary to use a water column pressure gauge connected to the pressure
plug.
Burner pressure
intake
H
G
I
