Anyone know the connections and expected voltages on the gas valve VK4105G fitted on a Ferroli boiler. Mine is not operating correctly and I want to determine if the fault is with the valve or the supply coming from the control board.

Paul, November 2016

In case it is of use to anyone else, here are the parameters for the VK4105G gas valve fitted to the Ferroli F24 boiler (and others).

Solenoid A - 1200 Ohms
Solenoid B - 1600 Ohms

Test voltage Valve A - 100VDC
Test voltage Valve B - 60VDC

Note that these voltages are not what you may see coming from the control board - they are the manufacturers test voltages.

Paul, December 2016

I am quite acquainted with the value of Google to obtain information. However, my question relates specifically to the expected voltage from the control board of the Ferroli F24 (not generic voltages). I have found many conflicting publications some of which mention 100VDC on the A solenoid and 60VDC on the B solenoid. I would appreciate any information on the ACTUAL voltage that would be expected in this scenario

Paul, November 2016

Ring ferroli tech helpline
If they cant help you no one can

Maxmad, November 2016

I am quite acquainted with the value of Google to obtain information. However, my question relates specifically to the expected voltage from the control board of the Ferroli F24 (not generic voltages). I have found many conflicting publications some of which mention 100VDC on the A solenoid and 60VDC on the B solenoid. I would appreciate any information on the ACTUAL voltage that would be expected in this scenario

Paul, November 2016

Why not just search for the datasheet?

http://ecc.emea.honeywell.com/downloads/EN2R9025.PDF

The coil voltage appears to be 196 to 253 V (Nominally 230V) (Actually I was quite surprised, since a lot of the SOV devices I work with are 24Vdc, but there you go)

Modulation is achieved by PWM of the solenoid supply and not varying the supply voltage. There is a detailed description on the datasheet.

At risk of upsetting certain individuals, can I point out that Google is really useful.

xxx, November 2016

While I appreciate your help the gas valve on the F24 is a two stage valve and I know that the control voltages are much lower than 240V. I need to know the nominal voltages on each solenoid (the modulating voltage will fluctuate) and the pins they should be applied to on the VK4105G gas valve.

Paul, November 2016

My Potterton boiler has a combined pilot and main burner gas valve each operated on 240V from the PCB. The pilot flame sensor - the control board or the valve itself may each be the culprit - or even a weak pilot flame.

I can not imagine a gas valve that needs a voltage other than 240V - but I only guess

Good Luck..., November 2016