Deicing Cable Alarm

[DrSparks]

Anyone know of an out of box solution for an alarm that monitors the operation of rooftop deicing Cable?

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[goldstar]

I'm not sure what you're looking for exactly. A few years ago I installed a controller for the de-icing cable on a small strip mall roof. I believe it was made by Easy Heat. It basically had a module that laid in a gutter and sensed both moisture and temperature before turning the heat cable on. You'll have to do a search for it on line if that's what you need. Good luck.

 

[tom baker]

A current relay wold be simple. Closes a contact on a min current value

 

[gadfly56]

Anyone know of an out of box solution for an alarm that monitors the operation of rooftop deicing Cable?

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Do you mean monitors when it's on, when it needs to go on, needs to go on but doesn't, is on when it shouldn't be, or doesn't have power to the cable?

 

[retirede]

Do you mean monitors when it's on, when it needs to go on, needs to go on but doesn't, is on when it shouldn't be, or doesn't have power to the cable?

NC contact on the current relay in series with a temp switch that closes below 35F. No current below 35 = alarm.

 

[DrSparks]

A current relay wold be simple. Closes a contact on a min current value

Yeah I'm leaning towards that direction.

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[DrSparks]

NC contact on the current relay in series with a temp switch that closes below 35F. No current below 35 = alarm.

I like it. Simple and allows temp control. Thanks!

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[tom baker]

3 pilot lights, current relay, thermostat:
Pilot light normally on for power status
T-stat that closes on low temp with a
call pilot light
Current relay with pilot light shows when cable is heating
Call for heat and current is alarm could wire up a few relays

 

[DrSparks]

3 pilot lights, current relay, thermostat:
Pilot light normally on for power status
T-stat that closes on low temp with a
call pilot light
Current relay with pilot light shows when cable is heating
Call for heat and current is alarm could wire up a few relays

I have three variables:

Power supply present (P)
Call for heat (H)
Current passing through cable (C)

I need an alarm when:

-P | (H + -C)

I realize I need an auxiliary power supply for this. I'm so surprised this is not something you can buy off shelf. I'm installing this on a job where there's been over $100,000 insurance claim submitted for water damage due to ice damming.

I like the idea of pilot lights to indicate the problem, but there needs to be an audible alarm on any point of failure.

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[petersonra]

I have three variables:

Power supply present (P)
Call for heat (H)
Current passing through cable (C)

I need an alarm when:

-P | (H + -C)

I realize I need an auxiliary power supply for this. I'm so surprised this is not something you can buy off shelf. I'm installing this on a job where there's been over $100,000 insurance claim submitted for water damage due to ice damming.

I like the idea of pilot lights to indicate the problem, but there needs to be an audible alarm on any point of failure.

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we could make you something. would even be ul508a listed. It would not be real complicated. I can't say I have ever seen something off the shelf that would do this. One would think there would be a market for such a thing.

 

[DrSparks]

we could make you something. would even be ul508a listed. It would not be real complicated. I can't say I have ever seen something off the shelf that would do this. One would think there would be a market for such a thing.

I'm thinking a passthrough device, such as the existing thermostats on the market that have a very good 10 year LiOn battery in them.

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[don_resqcapt19]

Raychem has heat trace controllers that can do what you need and more, but they are pricey.