White Rodgers 1F85-277 installation instructions Wiring Diagrams, Heat Pump Terminal Outputs, E/W1

WIRING DIAGRAMS

Polarity must be observed, tf the=HOT side of the second transformer I is jumpered to the COMMON side of the first transformer a short will

be made, Damage to equ pment w occur when power s restored,

E/W1

SYSTE THERMOSTAT

2t

.....	_ _" TWO COMMONS	MUST
	BE JUMPERED	TOGETHER!

L

/,I -- 2--_bi-- ] 24VACRyVACAuxiliary

Heating

/	',-I-- _		I'*'_RELAY NO.		transf	Zh	y	relay	scheme
l	I l	p	II	CONTACT	(Claspl!	l is required	when	safety
/	"-h	fl--'		CMMCN C	..... t Limited)	I circuits exist	in	both	syst ....
	%0

HOT

Heat Pump Transformer

(Class II Current Limited)

Figure 4. Typical wiring diagram for two transformer heat pump systems with safety circuits in BOTH systems

*The 24 volt neutral connection to terminal C on the thermostat is not required ifyou replace the batteries once a year with fresh "AA" EnergizeP alkaline battenes.

Heat Pump Terminal Outputs

Refer to equipment manufacturers' instructions for specific system wiring information.

You can configure the thermostat for use with the following heat pump system types:

HEAT PUMP TYPE 1. Single stage compressor system; gas or electric backup.

This thermostat is designed to operate a single-transformer system. If you have a two-transformer system, cut and tape off

one transformer. If transformer safety circuits are in only one of the systems, remove the transformer of the system with NO safety circuits. If required, replace remaining transformer with a 75VA Class II transformer. After disconnecting one trans- former, the two commons must be jumpered together.

Use the terminal output information below to help you wire the thermostat properly for your heat pump system. After wiring, see CONFIGURATION section for proper thermostat configuration.

THERMOSTAT

TERMINALS (HEAT

PUMP)

SYSTEM

L

Ct

R

W2

E/W1

Y2

Y1

G

O

B

Heat

Malfunction

24 Volt

24 Volt

HP 1 and

Emergency

No

Heat

and

Blower/Fan Energized

Energized

Energized

Pump

1

Light

(Common)

(Hot)

Emergenc_

Mode

Output

Cool

mode

on call for Heat

in Cool

in Heat

2nd stage

1st stage

1st stage

and Cool

Mode

OFF

Heat

HP2

2nd

(compressor)

Set GAS/ELEC

switch

Emergency

Pump

2

3rd stage

stage

for Emergency

mode

mode

compressor

*The 24 volt neutral connection to terminal C on the thermostat is not required ifyou replace the batteries once a year with fresh "AA" EnergizeP alkaline battenes.

i_rlPi !i: _ _24 V_(class ii, Current Lirnited)

Figure 5. Typical wiring diagram for single transformer multi-stage systems

*The24voltneutralconnectiontoterminalC on thethermostatis notrequiredifyou replacethebatteriesonceayearwithfresh"AA"EnergizePalkalinebatteries.