Finding a replacement time delay control for 1992 Bryant AC


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Old 08-21-12, 01:54 PM
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Finding a replacement time delay control for 1992 Bryant AC

I need to replace a time delay control for my Bryant AC, the current part is ICM hn67za003b, with a date code of 1092:



I haven't been able to get any help from the manufacturer, and the only 3-terminal time delay control I've been able to find is the ICM175 (see below). Would this be a suitable replacement? If so, what should the time delay be set at? Thanks.

 
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Old 08-21-12, 04:44 PM
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I believe you can bypass the relay and install a new digital thermostat and that takes care of that. Am i correct in assuming this relay has a time delay to prevent the unit from short cycling or is it connected the the condenser fan motor, where it delays to let head pressure build up?
 
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Old 08-21-12, 05:15 PM
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By the part number I'm pretty sure that is a 300 second (5 minute) "delay on make" timer. While you might be able to use the time delay circuitry of a thermostat I personally prefer the TD at the condensing unit.

Two-terminal time delay would wire with the yellow and violet wire and insulating the black.
 
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Old 08-21-12, 06:08 PM
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5 minutes, then it is just to prevent unit from short cycling. A digital tstat would do the same thing if u cant find that part.
 
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Old 08-22-12, 04:51 PM
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Battery powered stats don't activate the time delay after a loss of power.

Replace the delay - the icm175 will work provided that it's delay on break. (not delay on make)
 
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Old 08-22-12, 08:50 PM
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Right, but that would only happen if they lost power and how often does that happen.
 
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Old 08-23-12, 01:08 PM
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...more often than you think.

It's not uncommon to lose power for a second or two.
 
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Old 08-23-12, 03:45 PM
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Thanks everyone for the help. Most of our power outages here are less than 10 seconds, and happen probably 5 or 6 times per summer. Luckily we haven't had any issues yet.

It seems that most of the "delay on break" controls have 5 or more terminals. I'm not sure how I'd wire to those.

I found this one designed to prevent short cycling, but it's considered delay on make...why wouldn't this work? TGSCB | Anti-Short-Cycle (Lockout) Relay Timer
 
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Old 08-23-12, 06:04 PM
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A delay on make timer works at the beginning of each cycle.

1 second isn't long enough to provide any protection.

It's much better to use a 3-5 minute delay on break.
 
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Old 08-25-12, 03:53 PM
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I decided to go with a two-terminal delay on break, following Furd's advice, and it worked like a charm. Thanks everyone for the help!
 
 

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