I'm looking for a transformer with a circuit breaker to replace a White-Rodgers 90-112 transformer/relay. I can't find the combination with a breaker so I figured I'll buy the transformer and then pop it in in the 4" X 4" backplate since the relay is not used anyway. Will the Honeywell AT150F1022 be a suitable replacement?

Here is the specs:

AT 150 F 1022 Tradeline. 120/208/ 240V, Conduit and Foot Mount, with Circuit Breaker. AT150F 50VA Transformer, 60HZ 24V Sec. UL Comp.
Recog 9 IN Leads on Primary and Secondary. Conduit and Foot Mount. Circuit Breaker Button.

Plate or panel mounted 120/208/240 Vac Transformer with 9 in. lead wires and metal end bells
Honeywell AT150F 1022 Transformer Overview:
Provide power to 24 Vac circuits in heating/cooling control systems. Intended for use in systems with predictable, uniform loads. Can be used in any application that does not exceed the listed ratings.
Honeywell AT150 F1022 Transformer Features:
• Rated at 50 VA
• Color-coded leadwires for primary connections and screw terminals for secondary connections, fixed 1/4 inch (6 mm) male quick-connects or color-coded leadwires for both primary and secondary, are standard.
• Meet NEC Class 2 requirements.
• Meet Underwriters Laboratories Inc. Standard UL 1585 and are identified. Class 2 not wet, Class 3 wet.
Honeywell AT150F1022 Transformer Specifications:
Description Plate or panel mounted 120/208/240 Vac Transformer with 9 in. lead wires and metal end bells
Electrical Ratings -Primary Voltage 120 Vac, 208 Vac, 240 Vac
Electrical Ratings -Secondary Voltage 27.5 V.O.C.
Frequency 60 Hz
Mounting Includes 1/2 14 NPSM conduit connector and lock nut for mounting on plate or panel (not included) with 7/8 in. knockout, and feet for surface mount.
Electrical Connections (Primary)(in.) 9 in. leadwires
Electrical Connections (Primary)(mm) 229 mm leadwires
Electrical Connections (Secondary)(in.) 9 in. leadwires
Electrical Connections (Secondary)(mm) 229 mm leadwires
Electrical Ratings -Output 24 Vac at 50 VA
Dimensions (in.) 3 3/16 in. high x 2 3/16 in. wide x 3 5/8 in. deep
Dimensions (mm) 81 mm high x 56 mm wide x 93 mm deep
Temperature Ratings (F) -20 F to +105 F
Temperature Ratings (C) -29 C to +41 C
Approvals, Underwriters Laboratories Inc UL Listed: File no. E14881, Guide no. XOKV.
Approvals, Canadian Standards Association Certified: File No. LR95329-18
Includes Button for manually resetting the circuit breaker and metal end bells.

If the VA rating of the previous transformer does not exceed 50, that'll do just fine. Be sure you wire the primary for the correct input voltage (most likely 120v.) and cap the unused leads.

Thanks, just got it last night and it worked though it seems I have other problems to worry about. When I turned it on everything seemed fine. Connected the 24V controls and the boiler got power and came on. Got green on the low power cut off sensor. However when I jumped the t-stat wires to start the boiler; I was getting a clicking sound from the low power cut off sensor or at least in that area and then the transformer died. Continuity shows no continuity on the primary side. Any insight?

Thanks.

Wow it seems the new transformer shorted out by the same problem that shorted out the original transformer.

Is your boiler hot water or steam??

Here is your basic manual.

http://www.weil-mclain.com/en/multim...ler_manual.pdf

Here is another manual with a bit more detail for service.

http://www.weil-mclain.com/en/multim...ers_manual.pdf


Control suplement for standing pilot furnaces

http://www.weil-mclain.com/en/multim...standpilot.pdf

Control suplement for spark ignition boilers

http://www.weil-mclain.com/en/multim...supplement.pdf

Complete master parts list

http://www.weil-mclain.com/en/multim...parts_list.pdf


Your boiler is available in many different trim forms. Hot water,steam,spark ignition,standing pilot,ETC. Without knowing exactly what you have I provided all info available for you to look through so you can pick out your system exactly as you have it.

You will need to track down the shorted item and replace it so you do not damage any more transformers and to allow your system to be up and running. You might also place a small fuse into the wiring of the transformer so you only pop the fuse which is cheaper than replacing the transformer. A OHM meter will be your best friend in tracking down the defective/shorted part that is causing your problems.

Quote:

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Originally Posted by hvac1000

Wow it seems the new transformer shorted out by the same problem that shorted out the original transformer.

Is your boiler hot water or steam???

Here is your basic manual.

http://www.weil-mclain.com/en/multim...ler_manual.pdf

Here is another manual with a bit more detail for service.

http://www.weil-mclain.com/en/multim...ers_manual.pdf


Control suplement for standing pilot furnaces

http://www.weil-mclain.com/en/multim...standpilot.pdf

Control suplement for spark ignition boilers

http://www.weil-mclain.com/en/multim...supplement.pdf

Complete master parts list

http://www.weil-mclain.com/en/multim...parts_list.pdf


Your boiler is available in many different trim forms. Hot water,steam,spark ignition,standing pilot,ETC. Without knowing exactly what you have I provided all info available for you to look through so you can pick out your system exactly as you have it.

You will need to track down the shorted item and replace it so you do not damage any more transformers and to allow your system to be up and running. You might also place a small fuse into the wiring of the transformer so you only pop the fuse which is cheaper than replacing the transformer. A OHM meter will be your best friend in tracking down the defective/shorted part that is causing your problems.

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Hi Hvac1000

My boiler is steam. Circuit diagram is the same as on on page 8 of http://www.weil-mclain.com/en/multim...standpilot.pdf. I've ohmed out thermostat, rollout tfe wires, main 24V feeds to R and C, spill switch and the short isn't obvious. I get 0.00 on the connections of the rollout TFE but that seems to be just a fuse but the wires individually show open line. I don't know how to check the low cut off sensor since it's mounted on a circuit board part # PS-802-24. It looks like I can bypass it if I connect pins 1 to 3 on the connector... would that be right? By jumpering 1 and 3, would the boiler start if I jump the t-stat wires? Should I check the hot and neutral on the primary. Should ground be connected to neutral as I get continuity when I test. On the damper control harnessl I get about 1 megaohm between black and ground. I also see about 3 ohms when looking at the fuse on the ladder diagram.

Thanks

To test for a grounded component attach one leed to the one terminal on the component then place the other leed to a good ground (like the boiler jacket metal or a metal electrical box on the boiler. This way you can check each terminal one at a time.

Since this is a steam boiler I do not recommend jumpering any control on the boiler to get it to run. Depending upon the circumstances steam can be a nasty little bugger.

You need to perform the above style test on every device and wire that is in or attached to the boiler. Hopefully you will find a short circuit to ground.

Thanks,

Worked like a charm. Boiler is up and running. Was indeed a short to ground.

Good deal you got heat.