Walk in freezer defrost

[Elizeze]

I just took over an account with a walk in freezer with terrible snow issues. Customer is aware they have a door sealing problem and they are working in repairing it. In the meantime, this freezer has two evaporators controlled by their own condensing unit. One evaporator for one condenser. Should I try and sync the defrost (electric) so they both defrost simultaneously? Or does that even make a difference? They are both also controlled on their own separate stat and solenoids, working on installing one thermostat to control both solenoids.

[pecmsg]

They make a first on first off control for that application I have to find the information.

Where is the F R O S T forming?

[Poodle Head Mikey]

I like the idea of 100% redundancy of operation. Why change them to a single stat?

Defrost shouldn't change the box temperature much if any. Syncing the defrosts will produce no gain and is likely a tough thing to consistently accomplish anyway.

The issue is high internal humidity / air leakage - solve that first. Why go any further until you know where you stand?

PHM
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I just took over an account with a walk in freezer with terrible snow issues. Customer is aware they have a door sealing problem and they are working in repairing it. In the meantime, this freezer has two evaporators controlled by their own condensing unit. One evaporator for one condenser. Should I try and sync the defrost (electric) so they both defrost simultaneously? Or does that even make a difference? They are both also controlled on their own separate stat and solenoids, working on installing one thermostat to control both solenoids.

[Elizeze]

Frost on ceiling and evaporator closest to door. They installed a sliding door themselves and have had problems with door sealing ever since. The idea behind single stat is mainly to remove their existing thermostats: mounted inside evaporator cabinet sensing air temp. They look like A12-700 Thermostats. The terminations and fan delays both work properly also.

[GenesisRefrig]

I agree that sealing the box is the first step, but a close second is to install a KE2Therm Evaporator Efficiency Controller. www.ke2therm.com

Every one I've installed has been met with rave reviews from the customer. They save money, improve product quality, and totally eliminate frost.

One of my customers had serious frost problems in his walk in. The box is a pile of sh@! and should be replaced. He didn't have the money to replace the box, so we installed the KE2Therm controller, hoping it would help until he could buy a new box. All frost disappeared within a week and his product no longer sticks together. He also has a noticeable decrease on his utility bill each month.

[Elizeze]

I love KE2. I'll see if customer will go for that. Do you think I would need two controls for both systems or one control for both?

[GenesisRefrig]

Probably 2, but I'd call them and ask. Their customer service is second to none.

[BDOLIN]

Probably 2, but I'd call them and ask. Their customer service is second to none.

Pardon me if this shows up twice, I lost the internet for a moment.

For freezer applications, we suggest KE2 Evaporator Efficiency controllers on each coil,since the needs for defrost will be different for each coil. The controllers can be "bonded" to synchronize defrosts and refrigeration or run independently. If both coils are on a single condensing unit, if one satisfies on temperature of goes into defrost, the compressor is likely to cycle off anyway.
Part of the icing condition, aside from leaking doors and seams, is due to high coil temperature during defrost with the resultant fogging. The KE2Therm controller has the defrost termination sensor mounting in the fins of the coil so that coil temperature never rises above termination temperature, usually set at 50*F. During defrost the heaters are pulsed slowly to keep coil temperature from rising too quickly, giving a complete and low stress defrost.
We appreciate your confidence and are always available for questions or other support.