41652_model44760_web.pmd

10

INSTALLATION

10

What You Need

This thermostat includes two #8 slotted screws and two wall anchors for mounting. To install your thermostat, you should have the following tools and materials.

■Slotted Screwdriver(s) ■ Electric drill and 3/16" bit

■Phillips Screwdriver ■ Two 1.5 V (AA) size alkaline batteries

■Hammer

Remove Old Thermostat

CAUTION: Do not remove any wiring from existing thermostat before reading the instructions carefully. WIRES MUST BE LABELED PRIOR TO REMOVAL.

■IMPORTANT! Turn off the power to the furnace at the main power panel or at the furnace.

■Remove existing thermostat cover. See Figure 1. Some ther- mostats will have screws or other locking devices that must first be removed. Once wall mounting plate is exposed, look for wires.

If wires are not visible, they may be connected to the back of the wallplate. Again, look for screws, tabs, etc. Some models have doors that open to expose wires and mounting screws. (See Figure 1).

TYPICAL HOME THERMOSTATS

Figure 1

Wall Mounting Plate

Thermostat

Cover

Wall Mounting Plate

Thermostat

Cover

11

 

 

Wire Labeling

11

 

 

 

 

 

 

 

 

■ Each wire coming from the wall to the existing thermostat is

SHOWN IN TABLE A and B ON PAGES 12-13. (For example,

 

 

 

connected to a terminal point on that thermostat. Each of

attach the label marked W to the wire that goes to the W or H

 

 

 

these terminal points is usually marked with a code letter as

terminal on your existing thermostat.) IGNORE THE COLOR OF

 

 

 

shown in Table A on the next page.

THE WIRES since these do not always comply with the standard.

 

 

 

■ The number of wires in your system can be as few as four

■ After labeling wires, disconnect them from the existing ther-

 

 

 

(for single-stage systems), as many as eight, or any number

mostat terminals.

 

 

 

in between. If you follow the labeling procedures correctly,

■ Remove existing wallplate. To make sure wires do not fall back

 

 

 

you do not have to be concerned about how many wires

into wall opening, you may want to tape them to the wall.

 

 

 

there are.

 

 

 

■ If hole in wall is larger than necessary for wires, seal this hole

 

 

 

■ IMPORTANT! BEFORE DISCONNECTING ANY WIRES, APPLY

 

 

 

so that no hot or cold air can enter the back of the thermostat

 

 

 

THE SELF-ADHESIVE LABELS PROVIDED TO THE WIRE AS

 

 

 

from the wall. This air could cause a false thermostat reading.

 

 

 

 

(continued)