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INSTALLATION 

REMOVE OLD THERMOSTAT

1.  Shut off electricity at the main fuse box until installation is 

complete. Ensure that electrical power is disconnected.

2.  Remove the front cover of the old thermostat. 

With wires 

still  attached, 

remove  wall  plate  from  the  wall.  If  the  old 

thermostat has a wall mounting plate, remove the thermostat 
and the wall mounting plate as an assembly.

3. 

Identify each wire attached to the old thermostat using 
the labels enclosed with the new thermostat.

4.  Disconnect  the  wires  from  old  thermostat  one  at  a  time. 

 

DO NOT LET WIRES FALL BACK INTO THE WALL.

5.  Install new thermostat using the following procedures.

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 suit-
able container. Refer to www.white-rodgers.com for location to 
send product containing mercury.    

ATTACH THERMOSTAT BASE TO WALL

1.  Remove the packing material from the thermostat. Gently pull the 

cover straight off the base. Forcing or prying on the thermostat 

will cause damage to the unit.

2.  Connect wires beneath terminal screws on base using ap

-

propriate wiring schematic (see figs. 2 through 4).

3.  Place base over hole in wall and mark mounting hole loca

-

tions on wall using base as a template.

4.  Move base out of the way. Drill mounting holes.
5.  Fasten base loosely to wall, as shown in fig. 1, using two 

mounting  screws.  Place  a  level  against  bottom  of  base, 
adjust until level, and then tighten screws. (Leveling is for 
appearance only and will not affect thermostat operation.) 

If you are using existing mounting holes, or if holes drilled 
are too large and do not allow you to tighten base snugly, 
use plastic screw anchors to secure subbase.

6.  Push excess wire into wall and plug hole with a fire-resistant 

material (such as fiberglass insulation) to prevent drafts from 

affecting thermostat operation.

ELECTRIC/GAS JUMPER (Fan Option)

Read the following information before clipping the nonelectric 
heat jumper. If you are unsure of your application, contact a 
qualified service person.

If your emergency or auxiliary system will energize the blower, then 
jumper, W904, on the thermostat base must be cut (see fig. 1). 

If your emergency or auxiliary heat system requires that the 

thermostat energize the fan circuit, do not cut jumper W904.

OPTIONAL BATTERIES

With two "AA" batteries installed, your thermostat will continu

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ously display the temperature during a loss of AC power.

O/B TERMINAL SWITCH SELECTION

The  O/B  switch  on  this  thermostat  is  factory  set  to  the  “O” 

position. This will accommodate the majority of heat pump ap-

plications, which require the changeover relay to be energized 
in COOL. If the thermostat you are replacing or the heat pump 
being installed with this thermostat requires a “B” terminal, to  
energize the changeover relay in HEAT, the O/B switch must be 
moved to the “B” position. 

Figure 1. Thermostat Base

Mounting

hole

Mounting

hole

Electric/Gas

jumper

(W904)

O/B

switch

Reset switch

(below Fan switch)

Screw anchors

W

904

Summary of Contents for 1F89-211

Page 1: ...sformer systems Optional AA batteries to provide continuous temperature display during loss of AC power SPECIFICATIONS ELECTRICAL DATA Electrical Rating 20 to 30 VAC 50 60 Hz or D C 0 05 to 1 0 Amps L...

Page 2: ...oca tions on wall using base as a template 4 Move base out of the way Drill mounting holes 5 Fasten base loosely to wall as shown in fig 1 using two mounting screws Place a level against bottom of bas...

Page 3: ...ly one of the systems remove the transformer of the system with NO safety circuits NOTE Jumper required to use a single Aux Heat for both Second Stage Heat and Emergency See Note L R E SYSTEM MONITOR...

Page 4: ...to adjust temperature setting above room tem perature The cooling system should stop operating THERMOSTAT QUICK REFERENCE 2 1 3 4 5 8 10 6 9 5 8 7 Figure 5 Thermostat display buttons and switches SU...

Page 5: ...just under 6 F and the SL setting cycles at approximately 1 F 4 Select backlit display d L OFF or ON The display backlight improves display contrast in low lighting conditions Selecting backlight ON...

Page 6: ...et to Fan On 4 Check each wire connection to verify they are not shorted or touching together No bare wire should stick out from under terminal screws Try resetting the thermostat as described above I...

Page 7: ...7 NOTES...

Page 8: ...ww white rodgers com www emersonclimate com Homeowner Help Line 1 800 284 2925 White Rodgers is a division of Emerson Electric Co The Emerson logo is a trademark and service mark of Emerson Electric C...

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