Installation Instructions for
Heating & Air Conditioning
1F73
Non- Programmable, Auto Changeover
YOUR THERMOSTAT REPLACES
Description | 1F73 |
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Heat Pump (No Aux or Emergency Heat) | Yes* |
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Heat Pump (with Aux or Emergency Heat) | Yes* |
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Standard Heat & Cooling Systems | Yes* |
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Two Stage Heat & Two Stage Cool | Yes* |
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Standard Heat Only Systems | Yes* |
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Millivolt Heat Only Systems – Floor or Wall Furnaces | No |
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Standard Central Air Conditioning | Yes* |
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Gas or Oil Heat | Yes* |
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Electric Furnace | Yes* |
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Hydronic (Hot Water) Zone Heat – 2 Wires | Yes* |
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Hydronic (Hot Water) Zone Heat – 3 Wires | No |
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* Requires common for 24 VAC at the thermostat |
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CONTENTS |
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Preparations | 1 |
Thermostat Details | 1 |
Removing Old Thermostat | |
Mounting and Wiring | |
Check Thermostat Operation | |
Specifications | 6 |
Operation | 6 |
Troubleshooting |
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 DOES NOT NEED TO BE LEVEL TO WORK PROPERLY
Failure to follow and read all instructions carefully before installing or operating this control could cause personal injury and/or property damage.
2 THERMOSTAT DETAILS
O/B Terminal
Switches Selection
Mounting
Hole
O B
(O/B)Y2 E/W1 R | C |
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.
1.Remove Old Thermostat: A standard heat/cool thermostat consists of three basic parts:
| L Y1 W2 G |
| ELEC GAS |
Mounting | Elec – Gas |
Hole | Switch |
Figure 1. Thermostat Base
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.
2.Shut off electricity at the main fuse box until installation is complete. Ensure that electrical power is disconnected.
3.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.
4.Identify each wire attached to the old thermostat.
5.Disconnect the wires from the old thermostat one at a time. DO
NOT LET WIRES FALL BACK INTO THE WALL.
6.Install new thermostat using the following procedures.
PART NO. | |
of Emerson Electric Co. | Replaces |
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0621 |