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converting to a standing pilot cant get main valve to deliver gas
I have a Utica NG boiler Model MGBSI1251 with the intermittent spark system. The spark system does not spark . I checked all the AC voltages (120 and 24 volt) breakers, switches, thermostat all work correctly The Spark Module ground which has had problems in the past I checked it and it was fine.The gas is on and I have a 9" H2O gas pressure measured on a U tube manometer, and I had 24VAC going from the B1 and B2 terminals to the gas valve and the spark igniter .
I went to a local Utica boiler dealer who suggested that the first place to start was to replace the spark module , which I did- still no spark . Next he suggested the Flame Detecter with the 3 prong plug that plugs into the gas valve . Still no spark
. His last suggestion was to change the gas valve which is obsolete - and he did not have a replacement in stock , so I told him that I wanted to switch to a standing pilot and eliminate the intermittent spark system . He sold me a new gas valve,thermocouple and standing pilot assembly which I installed.
I was able to light the pilot, but still can not get the main valve solenoid to turn on and deliver gas to the burner manifold . I checked for blockage in the manifold and orfices to the burners - none found , Again all voltages 120vac and 24 vac are present into the aquastat with 120 going to the circulator, and 24 to the gas valve on the TR terminals , the coil resistance on the gas solenoid was 40 ohms . If I disconnect the thermocouple while the pilot is lit the pilot gas shuts off.
I have seen where transformers were bad and wouldnt hold a load so I bought a new 120 to 24 transformer , disconnected the 24 v feed from the aquastat and hooked the new transformer directly to the gas valve at the TR terminals - the gas valve still wont turn on
Any suggestions would be appreciated . I have never seen one like this before .Nothing makes sense on this thing to me. I have the thermocouple tip located about 3/16" beyond the end of the pilot flame diffuser - its one of the Y shaped diffusers Im assuming the pilot isnt being proved and thats why the valve isnt coming on - how can I verify that ?
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