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Installation Instructions for
Heating only
903990, 903994 &
918082
and
Heating & Cooling
903992 & 918081
CONTENTS
Preparations.1
Thermostat Features.2
Removing Old Thermostat.3
Mounting and Wiring.4
Set Heat Anticipator.5
New Thermostat Operation.6
Specifications.7
Troubleshooting.8
YOUR THERMOSTAT REPLACES
Description
903990
903994
918082
Standard Heating & Cooling Systems - 4 or 5 wires
No
Yes
Standard Heat Only Systems
Yes
Yes
Millivolt Heat Only Systems - Floor or Wall Furnaces
Yes
Yes
Standard Central Air Conditioning
No
Gas or Oil Heat
Yes
Yes
Electric Furnace
Yes
Yes
Hydronic (Hot Water) Zone Heat - 2 Wires
Yes
Yes
Hydronic (Hot Water) Zone Heat - 3 Wires
No
No
Heat Pump (No Aux or Emergency Heat)
No
Yes
Heat Pump (with Aux or Emergency Heat)
No
No
Baseboard Electric Heating or Line Voltage (120 or 240 Volt)
No
No
Q PREPARATIONS
Assemble tools required as shown below.
HAND OR POWER
DRILL WITH 3M6 INCH
DRILL BIT. IF NEEDED
RAT SLA06 SCREWDRIVER
WIRE CUTTER/STRIPPER
[a] o)c=3(p
SQ[g]
SPIRIT LEVEL OR PLUMB BOB AND UNE OPTIONAL-
THERMOSTAT MUST BE LEVEL TO WORK PROPERLY
Failure to follow and read all instructions carefully be¬
fore installing or operating this control could cause
personal injury and/or property damage
Q
THERMOSTAT FEATURES
MOUNTING SCREWS
CAPTIVE SCREWS
Figure 1.
Adaptor Plate
(optional)
WHITE-RODGERS
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
ST. LOUIS, MISSOURI 63123-5398
www.white-rodgers.com
©
REMOVING OLD THERMOSTAT
A
CAUTION
To prevent electrical shock and/or equipment damage,
disconnect electrical power to the system at the main
fuse or circuit breaker until installation is complete.
Before removing wires from old thermostat's switching subbase,
label each wire with the terminal designation it was removed from.
Some models also include an adaptor plate to cover unpainted
surfaces. Thermostat wires pass through the adaptor plate center
opening.
1. Remove Old Thermostat: A standard heat/cool thermostat
consists of three basic parts:
a. The cover, which may be either a snap-on or hinge type.
b. The base, which is removed by loosening all captive screws.
c. The switching subbase, which is removed by unscrewing
the mounting screws that hold it on the wall or adaptor plate.
Make a note here I
I of the anticipator setting on
the old thermostat for future reference and use in step 5.
The heat anticipator pointer, if adjustable, will be set at one of a
series of numbers representing the current rating of the primary
control in your furnace. The number will be one of the following:
.2, .4, .8, etc. or 0.2, 0.4, 0.8, etc.
If no heat anticipator/indication is showing, do not be concerned;
move on to the next step.
Printed in U.S.A.
PART NO. 37-6377B
Replaces 37-6377A
0217
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