burner wont fire?

mbracing

Ok, I'm new here but here is what I have. Trying to fire up a boiler I installed in my garage. I have a simple single zone hydronic setup, Columbia mcb50hd boiler (I got for free in good shape but missing gas valve and aquastat. Installed vr8300 valve and aquastat L8148A. Can't find any documents for wiring such as input/output so I can figure this out? Basically I have 120v going to l1, l2, circulator going to c1, c2, thermostat going to t,t.(which I have rigged to work right now cus t,t seems like it just shorts out to pull relay in?) I have the pilot lit, have the relay pulled in and circulator turns on but what tells the gas valve to turn on full? I tried to hook gas valve to b1, b2 but it sparked when I touched the relay? Checked it with a meter and b1,b2 when relay is pulled shows 120v? Gas valve is a 24v?

World Plumber

oops

Well you can throw that gas valve in the garbage. First you bought the wrong control then you fried the coil in the gas valve. May you should consider getting someone more knowledgeable to hook it up. Before you don't have a garage. Errors hooking up gas can be deadly.

icesailor

Burner won't fire:

And is it a legal installation in a garage? Like is it in a separate space or is the source of ignition 18" above the floor? Does the gas piping met code and is it inspected? Is the install permitted and does the venting meet code requirements?

All the things I must do.

Tim McElwain

Well we live and learn don't we!

Everything others have already posted apply. What I suggest is you have a homeowner moment and at least talk to someone who does this for a living.



As for correct control for your situation with the VR 8300 series 24 volt valve you needed an L8148E which has a 24 volt burner circuit. The L8148A you could probably find someone who does oil and they will buy it if it still works. Now once you have purchased the new relay make sure you have a pro to finish up and have a correct installation.

World Plumber

Gas Valve

Do I understand right you put 120 volt to the gas valve. If so the coil is probably fried. If not that valve need to be tested to see if it is functioning correctly. If that valve opens and sticks open it could be disastrous. Safest bet would be to replace the valve.



MC

Tim McElwain

Actually if 120 volts was

applied to the low voltage valve coil the valve will never open. The VR8300 is a redundant gas valve actually two valves in one and the first valve solenoid is fried.

Tim McElwain

No not without

taking the relay apart and resoldering the connections on the back side. That then becomes a big liability issue. The L8148A is wired so that when you send 120 VAC to the relay on terminals 1 & 2 it powers the internal 24 xfmr. When the thermostat calls it brings in two sets of contacts (clappers) C1 & C2 for the circulator and B1 & B2 for the 120volt load device.



You do not see many gas installations on the residential side that use 120 volt gas valves.

World Plumber

Isolation relay

You could use an isolation relay with a 120 volt coil ; wire the 24 volt through the contacts and the b1, b2 to the coil. Put it in a large junction box so no one gets zapped.



The 120 volt is generally used with oil. Most gas valves are either 24 volt or 220 volt. Most in the USA are 24 volt.