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Old heater w/two limit switches, fan, transformer, three…

Customer Question
Old heater w/two limit...

Old heater w/two limit switches, fan, transformer, three terminal gas valve, brother replaced the fan but unconnected all wires, i need to know how to rewire it now, thanks for your help

Contractor's Assistant: I'll do all I can to help. Is there anything else important you think the HVAC Technician should know?

No, transformer tested ok,

Submitted: 2 years ago.Category: HVAC
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Answered in 13 minutes by:
2/19/2016
HVAC Technician: airheatman, HVAC Technician replied 2 years ago
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 9,529
Experience: Furnace, A/C and heat pump specialist.
Verified

Look and see if there is a label with model number

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Customer reply replied 2 years ago
model is 68 200 7, 160,000 btu/hour
Customer reply replied 2 years ago
serial no. 0472 2
HVAC Technician: Tim H., HVAC Professional replied 2 years ago
Tim H.
Tim H., HVAC Professional
Category: HVAC
Satisfied Customers: 3,972
Experience: Experienced in all aspects of HVAC, both residential and commercial.
Verified

Hi, I'm Tim and I'm an HVAC expert here to assist you with your questions. Please provide all information I request as it makes it more difficult to troubleshoot something when I'm not there onsite. Essentially, you become my eyes and ears. Thanks for the opportunity to help. At the end of our dialog, you will have a chance to rate my service, but please wait until we are finished and you're satisfied you have all the information you need. Please be patient as many times we work with several customers at once.

Does the unit have a wiring diagram you could upload?

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Customer reply replied 2 years ago
if it had a wiring diagram i wouldn't need further information,it has one power in wire(a black, a white, a green) white should go to white on input side of transformer-and white on fan motor, black to one of the thermistor in and out to black in on transformer (?), transformer out one lead to TR(?)on gas valve,other to the other thermisto, thermistor out to gas valve TR-TH(?), and thermistat wires to gas valve TR-TH and gas valve TH ?? any way those are the six elements i need to connect probably not in the right sequence, the sequence is what i need help with, thanks for your help and any input you might have, it is an old unit and has had undoubtedly modifications through its life (changed gas valve, it appears newer than the rest of the unit
HVAC Technician: Tim H., HVAC Professional replied 2 years ago

If you can upload some pics of all the components, I can take a look at them and try and see what I can do. It is tough working with a unit, no wiring diagram, no model number that will help (too old). Since it is a 3 terminal gas valve, I assume unit is standing pilot.

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Customer reply replied 2 years ago
pilot works and unit is currently ported for natural gas, i have to travel to the shop to get pictures and no net access at the shop and bro's hour at the shop are irregular
HVAC Technician: Tim H., HVAC Professional replied 2 years ago

OK, well the pics will help me a lot. I've seen almost everything out there in over 20 years in the business and you know what they say, a picture is worth a thousand words!

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