Installation Instructions for
Heating only
1C20
and
Heating & Cooling
1C26
YOUR THERMOSTAT REPLACES
Description | 1C20 | 1C26 |
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Standard Heating & Cooling Systems - 4 or 5 wires | No | Yes |
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Standard Heat Only Systems | Yes | Yes |
Millivolt Heat Only Systems - Floor or Wall Furnaces | Yes | Yes |
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Standard Central Air Conditioning | No | Yes |
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Gas or Oil Heat | Yes | Yes |
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Electric Furnace | Yes | Yes |
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Hydronic (Hot Water) Zone Heat - 2 Wires | Yes | Yes |
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Hydronic (Hot Water) Zone Heat - 3 Wires | No | No |
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Heat Pump (No Aux or Emergency Heat) | No | Yes |
Heat Pump (with Aux or Emergency Heat) | No | No |
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Baseboard Electric Heating or Line Voltage (120 or 240 Volt) | No | No |
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CONTENTS |
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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 |
| 8 |
1 PREPARATIONS
Assemble tools required as shown below.
FLAT BLADE SCREWDRIVER | WIRE CUTTER/STRIPPER |
HAND OR POWER
DRILL WITH 3/16 INCH
DRILL BIT, IF NEEDED
SPIRIT LEVEL OR PLUMB BOB AND LINE 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
2 THERMOSTAT FEATURES
MOUNTING SCREWS
ANTICIPAT OR
CAPTIVE SCREWS
SUBBASE (MODEL 1C26 ONLY)
BASE
COVER
| Adaptor Plate |
Figure 1. | (optional) |
| |
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3 REMOVING OLD THERMOSTAT
!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
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 |
| 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.
| PART NO. |
Replaces | |
0835 |
