White Rodgers 1C21 Thermostat User Manual

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CONTENTS  
Preparations ...........................................  
Thermostat Features ..............................  
Removing Old Thermostat .....................  
Mounting and Wiring ..............................  
New Thermostat Operation ....................  
Specifications .........................................  
Troubleshooting .....................................  
1
2
3
4
5
6
7
Installation Instructions for  
Cooling only  
1C21  
PREPARATIONS  
YOUR THERMOSTAT REPLACES  
1
Assemble tools required as shown below.  
Description  
1C21  
Standard Heating & Cooling Systems - 4 or 5 wires  
Standard Cool Only Systems  
No  
Yes  
Yes  
Yes  
No  
FLAT BLADE SCREWDRIVER  
WIRE CUTTER/STRIPPER  
Millivolt Cool Only Systems - Floor or Wall Furnaces  
Standard Central Air Conditioning  
HAND OR POWER  
Gas or Oil Heat  
DRILL WITH 3/16 INCH  
DRILL BIT, IF NEEDED  
Electric Furnace  
No  
Hydronic (Hot Water) Zone Heat - 2 Wires  
Hydronic (Hot Water) Zone Heat - 3 Wires  
Heat Pump (No Aux or Emergency Heat)  
Heat Pump (with Aux or Emergency Heat)  
Baseboard Electric Heating or Line Voltage (120 or 240 Volt)  
No  
SPIRIT LEVEL OR PLUMB BOB AND LINE OPTIONAL—  
THERMOSTAT MUST BE LEVEL TO WORK PROPERLY  
No  
No  
Failure to follow and read all instructions carefully be-  
fore installing or operating this control could cause  
personal injury and/or property damage  
No  
No  
THERMOSTAT FEATURES  
REMOVING OLDTHERMOSTAT  
2
3
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.  
MOUNTING SCREWS  
CAPTIVE SCREWS  
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  
BASE  
consists of two 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.  
ATTENTION! This product does not contain mercury. How-  
ever, 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 non-absorbent 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.  
COVER  
Adaptor Plate  
(optional)  
Figure 1.  
Mercury must not be discarded in household trash. When the unit  
this product is replacing is to be discarded, place in a suitable  
container.Refertowww.white-rodger.comforlocationtosendthe  
product containing mercury.  
PART NO. 37-6370B  
Replaces 37-6370A  
0835  
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MOUNTING AND WIRING  
5
6
NEW THERMOSTAT OPERATION  
After power is turned on, slide temperature lever to desired  
setting. To turn cool off, slide lever all the way to the left until it  
clicks.  
4
WARNING  
!
Do not use on circuits exceeding specified voltage.  
Higher voltage will damage control and could cause  
shock or fire hazard.  
Do not short out terminals on gas valve or primary  
control to test. Short or incorrect wiring will damage  
thermostat and could cause personal injury and/or  
property damage.  
SPECIFICATIONS  
ELECTRICAL DATA  
Switch Rating ........................24 VAC (30 VAC max.)  
Cooling ....................................0 to 1.5 Amps  
Switch Action ........................Snap Action  
Anticipator Rating:  
Thermostat installation and all components of the sys-  
tem shall conform to Class II circuits per the NEC code.  
A. Mount base and adaptor plate: Mount base and adaptor  
plate (optional) to wall using screws provided (see Fig. 1).  
B. Attach wires: Attach one wire to R and the other wire to Y on  
base.  
C. Snap on cover: Carefully align the cover with the base and  
snap the cover onto the base.  
Cooling ....................................Fixed  
THERMAL DATA:  
Temperature Range ..............50°F to 90°F (10°C to 32°C)  
Operating Humidity Range ...0 – 90% noncondensing  
CAUTION  
!
Take care when securing and routing wires so they do  
not short to adjacent terminals or rear of thermostat.  
Personal injury and/or property damage may occur.  
TERMINAL CROSS REFERENCE CHART  
New Thermostat  
Terminal Designation  
Other Manufacturers’  
Terminal Designation  
R
Y
V
C
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TROUBLESHOOTING  
7
Symptom  
Possible Cause  
Corrective Action  
No Cool  
1. Blown fuse or tripped circuit breaker.  
2. Furnace power switch to OFF.  
Replace fuse or reset breaker.  
Turn switch to ON.  
3. Furnace blower compartment door or  
panel loose or not properly installed.  
Replace door panel in proper position to engage  
safety interlock or door switch.  
4. Loose connection to thermostat or system.  
Verify thermostat and system wires are securely  
attached.  
5. Thermostat or cooling system requires  
replacement or service.  
Your cooling system manufacturer or service  
person can describe how to test the cooling  
system to verify it is operating correctly. If the  
cooling system is capable of operation and the no  
cooling condition persists, replace the thermostat.  
Cool Runs Constantly  
1. Possible short in wiring.  
2. Possible short in thermostat.  
Check each wire connection to the thermostat to  
verify it is neatly looped under the terminals. No  
extra wire should stick out from under the  
terminals.  
Cooling Cycles Too Fast or Too Slow  
(narrow or wide temperature swing)  
1. Poor thermostat location for sensing room  
temperature.  
2. Cooling system over or undersized.  
3. Excessive Current draw influencing thermostat.  
The cycle rate for cooling can not be adjusted.  
The location of the thermostat, size of the Cool  
system and current draw can influence the cycle  
rate. Contact a local service person for suggestions.  
Thermostat Setting and Thermostat  
Thermometer Disagree  
1. Thermostat thermometer setting requires  
adjustment.  
The thermometer can be adjusted by using a  
standard slotted screwdriver. Turn the thermom-  
2. Thermostat setting lever requires calibration. eter pointer screw located inside the front cover  
to change the setting. For calibrating the setting  
lever contact a local heating and cooling service  
person.  
Adjusting Thermometer  
1. Thermostat thermometer disagrees with  
other room thermometers.  
The thermometer on the thermostat is accurately  
calibrated at our factory but you can adjusted it  
by using a standard slotted screwdriver. Turn the  
thermometer pointer screw located inside the  
front cover to change the setting.  
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The Emerson logo is a  
trademark and a service mark  
of Emerson Electric Co.  
White-Rodgers is a division  
of Emerson Electric Co.  

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