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I have 2 janitrol wh-100 heaters. I have not used them for 8

years. Both are wired to...
I have 2 janitrol wh-100 heaters. I have not used them for 8 years. Both are wired to their own thermostats. Neither fan will turn on when it falls below the set temperature.
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Answered in 1 minute by:
10/17/2016
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8,791
Experience: Furnace, A/C and heat pump specialist.
Verified

This is a garage heater isn't it?

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Customer reply replied 1 year ago
They are in a 3000 square-foot workshop. I had the same units in a warehouse that I rented years ago and I had somebody install these when I build my workshop.

OK, are you sure these units have a fan that comes on by lowering the thermostat?Most unit heaters just have a fan that comes on after burners ignite to circulate the heat

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Customer reply replied 1 year ago
Unless there was a malfunction after I disconnected the gas. I thought the fans kept turning on until I turned off the circuit breaker. (I had stacked pallets of ice melt in front of the thermostats, so I couldn't turn them off.)
Customer reply replied 1 year ago
Can I "heat up" something in the heater to see if I'm developing parts-heifers?
Customer reply replied 1 year ago
That should have been "heat up" something on the unit to see if it will then turn on?

Normally the fans are only on when burners are lit.Tell me how many wires you have at thermostat . If only two wires, touch the wires together and see if we get any response.

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Customer reply replied 1 year ago
I was getting "contact" and a clicking up in the unit, when I moved the thermostat, but nothing else.

1. Do you see a wiring diagram you can send me a pic of (I do not have manual on the model)

2. Do you have a volt meter so we can troubleshoot?

3. Did this model have a control board with a light to blink letting us know of a malfunction?

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Customer reply replied 1 year ago
I have headed home and watch daughter so my wife can head to work. Will you be available tomorrow during the day?

Absolutely

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Customer reply replied 1 year ago
Thanks. I'll respond tomorrow when I get back in.

Sounds good.

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Customer reply replied 1 year ago
Let me know when you start for the day. I'll be back in front of the heaters in 15 min.

I am here. Lets check to make sure the limit is closed with wires disconnected. If so turn thermostat to call for heat and let me know if we get 24v to the valve

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Customer reply replied 1 year ago
I am now getting no clicking in the unit when the thermostat is activated "up" or "down." I have checked the connections in both units and they are correct. I have 110 running to the fan switch on he left (I believe) and nothing at the motor switch. Pic attached. This might be more efficient if you don't mind calling.

Sorry for the delay.Got called away right after I replied. Can you bypass the fan switch to see if we get power to motor?

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Customer reply replied 1 year ago
I can get the fan to run by direct connecting it to the incoming power. Is that what were asking?
Customer reply replied 1 year ago
the fan turn on when I brushed the two connections of the thermocoupler (?) on the left
Customer reply replied 1 year ago
Sorry about that, I had an unexpected delivery. No voltage btwn TR/TH after jumping the thermostat.
Customer reply replied 1 year ago
Nothing from TR/TR.

Hmm we may have a bad transformer. Don't these come directly from transformer? And how about 120 into transformer?

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Customer reply replied 1 year ago
New transformer. That was my first guess because It looked so bad. Good power into the transformer which is hot because I forgot to unjump the thermostat

Let me know if the transformer fixes you up.

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Customer reply replied 1 year ago
Sorry for the confusion. I have already replaced the transformer.

I see.So you have a new transformer but it has 120 in but nothing out?

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Customer reply replied 1 year ago
I guess neither one of us read the schematic correctly. I have AC not DC coming out of the transformer. So testing it with DC didn't work. I have 120ac NOT 24dc between TR and TR at the valve.
Customer reply replied 1 year ago
Wait, is this the wrong transformer?

I only see one transformer on diagram. Power comes into transformer. Thermostat calls for gas valve to open , burners come on ands once temp is reached limit to fan closes signaling fan on from what I can tell.

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WE only need 24v output but this should be fine.Anywhere between 24 and 28 is acceptable.Is the transformer not sending 25v out?

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Customer reply replied 1 year ago
Battery must have been dying or it was dropped too many times. Borrowed a meter from next door.
24 at thermostat
0 btwn TH/TR
24 out of transformer

TR and TR at valve 24V?

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OK jumping the thermostat wires should make valve open.

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Customer reply replied 1 year ago
I thought I just did this. Are you saying TR/TH at the valve should be 24?

24V common goes to one TR terminal. 24V hot goes to other TR terminal.

One thermostat wire should connect to each TH.

When thermostat is raised or jumped the circuit should flow back to TH at valve giving us 24v between TR and TH See below.

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Gas valve should be clicking and opening. If not the solenoid on the valve may be defective

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Customer reply replied 1 year ago
Something is clicking. I want to get some telephone wire and stretch it from the thermostat over to where the heater is a touch them together and see if the noises coming from the valve

OK. Make sure gas supply is on also.

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Customer reply replied 1 year ago
Gas supply is OFF. The gas company said to make sure that the unit is "functional" before they came out.

Appears it should be functional once you have gas. If the valve is clicking, that means it is opening.

I think if we get gas it will work. Here is what should happen. Thermostat calls for heat,gas valve opens, burners light and heat chamber,when warm blower is energized.

airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8,791
Experience: Furnace, A/C and heat pump specialist.
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Category: HVAC
Satisfied Customers: 8,791
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