Room thermostat connection on VF-3000

Boiler is coming along very good but I need to know if my room thermostat gets connected to the A350 control anong with the feeder and oil gun thermostat wire? it is a duel boiler, oil and coal. Do I connect it to the same terminals?

I pressured up the system this morning and I had a dribble but tightend the packing on a valve and that took care of that.
I have been taking cold showers for two days while I am plumbing this thing out so I put the oilg gun in hooked up the fuel line.I wired the gun direct to the breaker with no controls and bled the air out.I then fired the gun till I got 130 degrees turned off the switch so I could take a hot shower.

Install is looking GOOD! Will you have to take the oil gun off the boiler when you want to burn coal??

steveyrock wrote:Boiler is coming along very good but I need to know if my room thermostat gets connected to the A350 control anong with the feeder and oil gun thermostat wire? it is a duel boiler, oil and coal. Do I connect it to the same terminals?

hey stevyrock I can see you have been very busy!!!

I don't think you need that thermostat supplied with the VF3000.

I assume you have a wall thermostat up stairs in your house.
is it high voltage or low voltage?

if it is low voltage (24v ac) you will need to buy a switching relay like this:
http://www.pexsupply.com/Categories.asp ... 4&brandid=

This you will use to turn on the circulator for heat.


if you have high voltage thermostat up stairs you can wire it directly to the circulator.


The VF3000 dosen't know anything about your wall thermostat.
If you wired the oil gun as shown in the oil burner kit, you should be able to set the A350 to 140 degrees
and supply power to the gun and the a350 will fire the gun until the temp gets to 140* and then it will turn it off.

your set up looks a little to close to the oil tank....but it's hard to judge distance from a picture.
in New york state you need 10ft between a oil tank and a boiler.... it may be different where you are.

syncmaster
Thanks,I knew I would need to get the 120 voltage to the circulator pump but was thinking the S350 control was getting the low voltage signal for the circulator.I am familar with honeywell controls but never had the Johson aquastat.

I have the old Honeywell aquastat that would convert the 24 volt thermostat current to 120 to the circulator.Think this would work if I didn't involve the aquastat control side and just wired it for the circulator? I am going to do a test.

The oil tank is 5 ft from the flame the old boiler was 7.

Razzler,no I can leave the gun installed but will have to cover the nozzle with a plate that came with the boiler,I also will flip a switch on a box also provided, from oil to coal.

I have the old Honeywell aquastat that would convert the 24 volt thermostat current to 120 to the circulator.Think this would work if I didn't involve the aquastat control side and just wired it for the circulator? I am going to do a test.

I think the aquastat you had, also had a built in 24v transformer and a relay to supply 120v to the circulator.

the S350 ONLY controls the stoker or the oil gun (depending on the oil/coal toggle switch).


What might be confusing to you is the Y350 module, it has terminals to turn on a circulator but it is not for heating your house, it only turns on the circulator when the boiler is over the max temp.

where are you going to dump your overheat ?

syncmaster
yes I understand the the over heat feature and was assuming if it overheated it would run my circulator and pump water into the heating system to shed the heat even though I may not want the heated water circulating through the house but it will let me know there is a problem.My friends Keystoker is set up that way with a zone circulator. Do I need another dedicated overheat circulator to do this?

I like to air condition my house in the summer.....I wouldn't have the VF3000 dump extra heat through out my house.

first understand if the VF3000 is dumping excess heat it dosen't mean something is wrong.
since coal can't stop making heat like a oil burner, dumping excess heat is normal.

This is what I would do if I were you.
leave your circulator where it is and add 2 zone valves, 1 for your main house and 1 for a heat dump.

I don't know how much baseboard you need as a heat dump zone.
I would guess 10ft would do it.... put it in your basement.

syncmaster
this is getting expensive, anyhow I understand your thinking and will make the proper dump zone.Right now I have another issue as my burner is not getting a signal from the aquastat on low water temp.I can fire it by jumping the two thermostat terminals on the gun itself.

Did your feeder plate have threaded holes to mount it to the feeder?

my burner is not getting a signal from the aquastat on low water temp

look at the two sheets of paper separate from the manual it says"aquastat installation"
step 10 (did you set the jumpers to heat?)

do you have 120v power conected to the Y350 power module johnson modules (thats the middle blue one)?

Did your feeder plate have threaded holes to mount it to the feeder?

No, the feeder plate, really called the adapter plate is missing the threads.
you will need to buy a 5/16 tap and put the threads in yourself .
go slowly because I ended up snaping off the tap in one of the holes and had a bad time getting it out.
Then I had to run out and get a new tap, they are about $6.00

Steveyrock

In a multizone system with zone valves, the zone valves themselves have switches which close when the valve calls for heat. Most people wire these reporting switches together to control the pump, when a call for heat comes from a thermostat, the zone valve opens, its reporting switch closes, and the circulator pump then runs. You can use a relay inbetween these reporting switches and the zone valve which will limit all the power at the zone valves to low voltage AC which is safer, but the switches on most valve are rated for 120VAC.

On a single zone system, you can get by without zone valves, but you will have to use a 24VAC relay which will be controlled by your room thermostat, and he relay will then turn your circulator on and off.

The Johnson controls package does two things for you. It turns the stoker on when the boiler water falls below your preset temperature, and through the S350 stage module, it forces one of your heating zones to be a dump zone in the event of the boiler water exceeds your setpoint temperature + 30 degrees. You can use the contacts from the S350 to parallel one of your room thermostats, thereby actuating that zone in the event of an overtemp, it will dump heat untill the water temp is below the limit. The Harman manual is quite confusing in how it details hooking up the dump zone.

BTW, the install looks real good, chimney with the baro damper looks exactly like mine.

syncmaster
yes 120 power to the y350 and jumpers set A350 on heat and y350 cool.By the book with everything. I got hot water in the boiler and the t stat wires going to A350 and fron there to feeder terms and also to oil gun as shown in the gun papers. I got the door switchs working properly and spade pluged into the gun terms.

Feeder plate adapter yes I drilled out the holes and nutted a tad longer 5/16 bolt on the other side.

Highlander
yes as long as my A350 is not faulty.wires, plugs up the gazoo along with halfassed instructions.I never had a product so non user friendly and this thing has got to be right. No factory sapport ,dealers know nothing so I don't even bother contacting them about anything. I feel this thing was really jerry rigged together to make it duel fuel.

did you install the A99 bulb sensor into the well with the spring and wire it to the A350 terminals?

also check that all 3 modules are pressed really tight against each other ( thats how they get their power to each other.

syncmaster
yes A99 installed and wired to the A350 to the correct terms and I have power all the way over to S350 when I swing the temp dial on the A350,lite comes on at S350. Tstat wires from A350 to feeder and oil gun at proper terminals.140 degree water in boiler so I swing the A350 dial to 200 the gun should fire? Differential set at 20.