41652_model44760_web.pmd

12

 

 

INSTALLATION

12

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TABLE A – TERMINAL DESCRIPTIONS

 

 

 

 

 

 

 

 

 

 

TERMINAL

FUNCTION

 

 

 

 

 

LABELS

(HEAT PUMP)COMMENTS

 

 

 

 

R

24V AC supply

Hot wire of 24VAC transformer. Powers the thermostat & system.

 

 

 

 

 

 

 

 

 

 

 

Y1

Compressor stage 1

Activates the 1st stage compressor. (Heat or Cool for Heat Pumps)

 

 

 

 

 

 

 

 

 

 

 

W2

Auxiliary heating

Activates the 2nd stage (auxiliary) heating when required.

 

 

 

 

 

 

 

 

 

 

 

E

Emergency heating

Activates Emergency heating ONLY when the System Switch is in Emergency (em) Mode.

 

 

 

 

 

 

 

 

 

 

 

O

Reversing valve

Activates reversing valve in COOL mode. ALWAYS ON in COOL MODE.

 

 

 

 

 

(cooling mode)

 

 

 

 

 

 

 

 

 

 

 

 

B

Reversing valve

Activates reversing valve in HEAT mode. ALWAYS ON in HEAT MODE.

 

 

 

 

 

(heating mode)

 

 

 

 

 

 

 

 

 

 

 

 

G

Fan

Activates the system Fan. (Can be Auto, On, or Program controlled)

 

 

 

 

 

 

 

 

 

 

 

L

System monitor

Activates System Check LED on the front of thermostat.

 

 

 

 

 

 

(Controlled by the system, not the thermostat.)

 

 

 

 

 

 

 

 

 

 

 

C

24V AC common

Common wire of 24V AC transformer. REQUIRED for thermostat operation.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

13

 

 

 

 

TABLE B

 

 

 

13

 

 

 

HEAT PUMP CROSS-REFERENCE CHART

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

EXAMPLES OF DIFFERENT SYSTEM TERMINALS

 

 

 

 

 

 

 

 

 

 

 

 

 

HUNTER

 

 

 

BRYANT,

RHEEM-

 

 

 

 

TERMINALS

CARRIER

COLEMAN

COMFORTMAKER

PAYNE

RUUD

WEATHERTRON

YORK

LENNOX (1)

LENNOX (2)

R

R

R

R

R

R

R

R

R

V-VR

Y1

Y or Y1

Y

Y

Y

Y

Y

Y

Y

M

W2

W2

W2

W1

W2

W2

W-U

W

W1

Y

E

E

E

jumper

E

E

jumper

jumper

E

E

 

 

 

to W2

 

 

to W2

to W2

 

 

O

O

 

O

O

 

O

O

O

R

B

 

B

 

 

B

 

 

 

 

G

G

G

G

G

G

G

G

G

F

L

L or F

L

L or X

L

L

 

X

L

 

C

C

X

C, X, X1

C, C1, X1

X

B

B

C

X

 

 

Note: W2 wires

 

 

 

Note: X2 & T

 

 

 

 

 

no connection

 

 

 

wires no

 

 

 

 

 

 

 

 

 

connection

 

 

 

NOTE: If your heat pump thermostat does not have an E wire, use the provided jumper wire to connect the E terminal to the W2 terminal, as shown in three examples above. Refer to the Wiring Diagram on page 52.