White Rodgers 1F89EZ-0251 installation instructions Technical Data, Specifications

Technical Data

Figure 2. Typical wiring diagram for single transformer systems

O/B Y G W2 C **

Changeover

Relay* Compressor Fan Aux/Emergency

Contactor Relay Heat Relay

(Stage 2)

*Changeover Relay is energized in COOL when O/B switch is in the “O” position Changeover Relay is energized in HEAT when O/B switch is in the “B” position

**The 24 volt neutral connection to terminal C on the thermostat is not required if you replace the batteries once a year with fresh “AA” alkaline batteries.

THERMOSTAT

	L	R
SYSTEM			SYSTEM
MONITOR
SWITCH
			Hot
24 VAC
			120 VAC

Neutral

TRANSFORMER

(Class II Current Limited)

THERMOSTAT APPLICATION GUIDE

Thermostat	Thermostat	Maximum
Configuration		Stages
	Applications
Options		Heat/Cool
Heat Pump 1	Single Stage Compres-
Single Stage	sor Heat Pump Systems	2/1
Compressor Heat	- with Aux./Emergency
Pump (HP)	Heat

ATTENTION!

This product does not contain mercury. However, this product may replace a unit which contains mercury.

Do not open mercury cells. If a cell becomes damaged, do not touch any spilled mercury. Wearing nonabsorbent gloves, take up the spilled mercury and place into a container which can be sealed. If a cell becomes damaged, the unit should be discarded.

Mercury must not be discarded in household trash. When the unit this product is replacing is to be discarded, place in a suitable container. Refer to www.white-rodgers.com for location to send the product containing mercury.

Specifications

Electrical Rating:
Battery Power or Hardwire	20 to 30 VAC, 50/60 Hz or DC
Terminal Load	1.5 A per terminal, 2.5 A maximum all terminals combined
Setpoint Range	45° to 90°F (7° to 32°C)
Differential	Fast	Slow
Heat Pump	1.2°F	1.7°F
Aux./Emer Heat	.8°F	1.2°F
Operating Ambient	32° to +105°F (0° to +41°C)
Operating Humidity	90% non-condensing max.
Shipping Temperature Range	-40° to +150°F (-40° to +65°C)
Dimensions Thermostat	3-3/4” H x 4-3/4” W x 1-1/2” D

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