Lennox AHU/Heat Pump, Honeywell T-stat wiring


Old 03-11-15, 10:56 AM
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Lennox AHU/Heat Pump, Honeywell T-stat wiring

I want to make sure my low voltage wiring is connected correctly. Here's what I have:
2-ton CBX32MV, 8 KW 1-stage heat strip, 2-stage XP16 Heat Pump
3-ton CBX32MV, 9 KW 2-stage heat strip, 2-stage XP16 Heat Pump
Honeywell VisionPro TH8320U Thermostats

AHU wiring diagram:
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T-stat wiring diagram:
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The T-stat has a single Aux/E terminal. Does this connect to the W1 terminal for both units and keep the factory jumper from W1-W2 & W-2-W3? In the CBX32MV install manual, it says to "Remove jumper between W1 & W2 for two stage electric heat." I have 3 stages of heat right so I keep it in?

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Old 03-11-15, 07:00 PM
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I would keep the jumper in place for an 8 or 9 KW heat strip. It wouldn't be enough to make me upgrade the stat. If you had 15 or 20 KW the difference in operating cost would pay for the stat.

The Honeywell Prestige IAQ could take advantage of that DS terminal and take advantage of separate stages of electric heat strips.

It is too bad that they didn't install the VisionPro TH8321R. You could have upgraded for the cost of an EIM.
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