Wire T-stat to Heil unit


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Old 01-14-13, 05:37 AM
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Wire T-stat to Heil unit

I replaced a Trane package unit with a new Heil package unit. In hooking up the t-stat I can't figure out the wiring. I have the 8 color coded wires on the unit tied to the corresponding colors on the t-stat wires. On the t-stat it has the following connections. X2, O, G, Y, T, R, W, U, F, B Which wires go to these pins? It is a Heil Model PHD424 with 10KV heat strips as backup. Can anyone please help as I am in NC and it is getting colder here and no heat.
Thanks,
On the HEIL unit is says to hook the blue wire to the DH. What is DH?
 
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Old 01-14-13, 06:38 AM
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What is the make and model of the T-stat you have?
 
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Old 01-14-13, 03:46 PM
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http://icpindexing.toddsit.com/docum...1801200302.pdf

Looks like it's a Baystat239 or a Baystat240 from those terminals.

DH is dehumidification mode. It slows the blower down to reduce humidity when used with a Honeywell IAQ or other high end thermostat.
 
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Old 01-14-13, 04:28 PM
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I would verify that the old blue isn't common before applying power to the heat pump.

The baystat T is commonly using a brown wire and will not be used with the new unit

F would also be omitted.





I recommend replacing that old stat if it is a Baystat 239 or 240.

stat = Heat pump
R = R
B = C
Y = Y
G = G
W = W
X2 = V
O = 0
T = not used
F = not used
U = not used

Your old stat doesn't support the DH wire on the new unit.
 
 

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