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Old 02-28-2013, 02:51 AM   #1
12milebrewing
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Default True GDM-26 and Love/Ranco Controller

I've happened upon a True GDM-26 for use as my fermentation chamber. I've seen references to using an STC-1000/Love/Ranco with these units. What is the recommended approach in wiring these? Bypass the internal thermostat, or can it be plugged in to a Ranco without short cycle issues?

My goal is simplicity (Ranco), but if the best approach is the more complex (Love) one that's fine. I have so much invested in this new system the extra time/cost is irrelevant at this point.

Thanks in advance!

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Old 02-28-2013, 03:09 AM   #2
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If you have that much invested, it might be prudent to go with the Love controller, as the Ranco doesn't have an anti-short-cycle function. The wiring complexity for any of the three makes you mentioned is essentially identical...

Cheers!

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Old 02-28-2013, 07:56 PM   #3
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Would you wire it in after the stock thermostat as well?

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Old 02-28-2013, 09:29 PM   #4
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I installed my STC-1000 in the bottom louvers on my TRUE GDM-10 Fermentation Chamber. The existing thermostat is bypassed. Existing wires were used between the lower and upper enclosures. I ran the probe wire through the existing wiring hole in the floor of the unit. The Heat 1/2 duplex receptacle (and an always Hot other 1/2, not on schematic) were installed in the original thermostat cut-out, in case I needed to control a smaller heater or use some other AC device inside the chamber.

IMO, bypassing the thermostat is a better option in that it allows the evaporator fan to run constantly, which promotes defrosting and air circulation.







Original Schematic





Modified Schematic


The heat strip turned out to be oversized and I haven't actually needed to use it all winter.

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Old 02-28-2013, 10:06 PM   #5
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Thanks much for the schematics. I like the idea of the fan running constantly for recirculation.

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Old 02-28-2013, 10:16 PM   #6
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I use the heat side to run my fan "AFTER" the cooling cycle is done it runs for about 8-10 minutes the cooling runs for 5-10 minutes every hour or so.

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Old 03-01-2013, 01:14 PM   #7
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Quote:
Originally Posted by beaksnbeer View Post
I use the heat side to run my fan "AFTER" the cooling cycle is done it runs for about 8-10 minutes the cooling runs for 5-10 minutes every hour or so.
Do you run the evaporator fan during the cooling cycle also?
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