Latest Discussions : HVAC


01:54PM | 07/16/03
Member Since: 07/15/03
2 lifetime posts
I purchased a new digital thermostat and bounced the inforamtion provided off with the current handler and heat pump schematics I am using to make sure everything is right... BUT... there are a few problems...

The thermostat shows a wiring diagram to meet the following:

R = 24v Wire - (Hot wire of 24v transformer)
Y1 = First Stage of compressor - (Activates when first stage of compressor is called)
W1 = First Stage of auxiliary heating - (Activates when first stage of auxiliary heat is called or compressor heat in NR mode)
W2 = Second Stage of auxiliary heating - (Activates only when second stage of auxiliary heat is called)
G = Fan - (Always activates when system is on)
E = Emergency heat relay controls outdoor thermostat - (Always on in emergency mode; off in normal mode)
A = Normal compressor operation relay - (Always on in normal mode; off in emergency mode)
O, B = Reversing valve operation - (RD = Activates in cool mode; RB = Activates in heat mode; NR = Does not activate)
B, C, (X) = Common Wire - (Common wire of 24v AC transformer)

My Heat Pump and Handler both show this for a schematic:


Y2 ( Nothing on Therm for this ) ----------------------------------------------------------> ODD ( Optional )
R -------------------------------------> R ---------------------------------------------> R ( Obvious Fix here )
C (Nothing on Therm for this ) ---> C --------------------------------------------> C ( Nothing on thermostat diagram showing a "C" ) *
Y1 -----------------------------------> Y ---------------------------------------------> Y ( Obvious Fix here )
G --------------------------------------------------------------------------------------------------> G ( Obvious Fix here )
E --------------------------------------------------------------------------------------------------> W1 ( Confused; Thermostat diagram has a W1 also ?? )
W2 --------------------------------------------------------------------------------------------------> W2 ( Obvious Fix here )
B -------------------------------------> B --------------------------------------------> B ( Which B on the Thermostat Diagram ?? )

The Heat Pump Model Number and Serial Number are listed below:

Model # RPMC-042JAZ
Serial # 6288 M0603 12767
MFD 02/2003

I sure hope this is readable and understandable. Thanks for the help in advance.


12:38PM | 07/17/03
Member Since: 07/15/03
2 lifetime posts
Im not sure if your post is referring to what I should wire up or what.

Thank you for the reply. Let me redo what I have since what I typed earlier doesnt seem to make much sense.

Thermostat Diagram (This is what the thermostat is telling me each point controls)

R = Hot Wire of 24 Volt Transformer

Y1 = First Stage of Compressor

W1 = First stage of auxiliary heating

W2 = Second stage of auxiliary heating

G = Fan

E = Emergency Heat Relay (Controls outdoor thermostat, if available)

A = Normal compressor operation relay (if available)

O/B = Reversing Valve (RD=Activates in cool mode; RB=Activates in heat mode; NR=Does not activate)

C = Common wire of 24v AC transformer (if available)

** Notice above there is a W1 and a W2. BUT, the handler diagram shows that E (from the thermostat) should goto W1 on the handler. This is what is confusing... if there is a W1 on the thermo and a W1 on the handler ?? Do I eliminate the W1 on the thermostat ???

Connections showing for the handler and the ourdoor unit:

Handler Outdoor Unit

Now if you notice on the Thermostat connections, it shows what each point controls. I wish I had a way to KNOW what each connection point on the handler also controlled so I knew what connections to make FOR SURE.

But if you can tell me what connections to make, I would gladly appreciate it. Just for info, the schematics for the handler and the unit do not point out what each connection controls, if so, I would be good to go. Once again, thanks for the help !!

[This message has been edited by Craz (edited July 17, 2003).]


12:19PM | 11/28/03
Member Since: 11/27/03
6 lifetime posts
Did you but a heat pump tstat or just a heating and cooling stat?????

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