Calling All Hvac Guys...

Slowitdown · Nov 23, 2014

Alright guys got a tougher problem now. First off I want to say I am currently on the East coast as some of you know the temps are freezing and will be for the next five months. Anyway, for my hvac guys here is the problem. I have 4 rooftop units equaling 12 tons. I ran a couple the other day and noticed my ducts were leaking (big problem). I get on the roof and notice the pipes and coils on two of the units were frozen and looked like a bunch of snow around them. I never had a issue running AC in the winter why is this happening? What can I do to resolve?

Natural · Nov 23, 2014

I think it happens mostly when it's damp outdoors and right around the freezing mark or above. I would ask HookedonPonics. I believe he solved it by having a guy install a small heat pump/thermostat on the condenser coils. Don't know what your units are..but some of the splits have a winter package option to look into.
gl

Slowitdown · Nov 23, 2014

Natural said:
I think it happens mostly when it's damp outdoors and right around the freezing mark or above. I would ask HookedonPonics. I believe he solved it by having a guy install a small heat pump/thermostat on the condenser coils. Don't know what your units are..but some of the splits have a winter package option to look into.
gl

Thanks but the units are not minisplits. They are 5 ton rooftop units.

Natural · Nov 23, 2014

You should post up so CannabisJohn can see it..maybe here https://www.thcfarmer.com/community/threads/grow-room-a-c.46645/ I think there's sumthin you can do, maybe a head pressure control switch.
This guy seems to have some tips maybe take a peek

He suggests to defrost it..turn off the AC and let the fan run normal..gonna be messy though.

Billyboat · Nov 23, 2014

Low ambient kit is what you need.

Slowitdown · Nov 23, 2014

Billyboat said:
Low ambient kit is what you need.

Going to talk to my hvac guy tmw see what he thinks about this.

Natural · Nov 23, 2014

Exactly @Billyboat ...Low Ambient Kit...I think is the same thing as a head pressure control switch..it uses a thermostat to operate the fan at lower speeds to control freezing. I'm thinking it will be the same fix for splits and heat pumps..just diff kit.
Hope you get her worked out Slow..I'm sure your guy can get it done.

Billyboat · Nov 23, 2014

Natural said:
Exactly @Billyboat ...Low Ambient Kit...I think is the same thing as a head pressure control switch..it uses a thermostat to operate the fan at lower speeds to control freezing. I'm thinking it will be the same fix for splits and heat pumps..just diff kit.
Hope you get her worked out Slow..I'm sure your guy can get it done.

Yea I'm pretty sure it's the same thing, they run like 200-250 bucks.

Cheers

advanced396 · Nov 24, 2014

Here's what you need on eBay set it to 100/400 there like $50 to $60 bucks they cut your fan off then come back on when head pressure builds up . It connects to your liquid line on your condenser. You will also need a 3/8 tee swivel.

Look at this on eBay:

http://pages.ebay.com/link/?nav=item.view&alt=web&id=321138009577

NEW PENN JOHNSON CONTROLS P72AA-27

Look at this on eBay:

http://pages.ebay.com/link/?nav=item.view&alt=web&id=331346805499

JB INDUSTRIES A31851-G Access Valve,Swivel Tee,PK

Calling All Hvac Guys...

Calling All Hvac Guys...

Slowitdown

Natural

Slowitdown

Natural

Billyboat

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Slowitdown

Natural

Billyboat

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advanced396

Calling All Hvac Guys...

Calling All Hvac Guys...

Slowitdown

Natural

Slowitdown

Natural

Billyboat

Moderator

Slowitdown

Natural

Billyboat

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advanced396

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