CONTENTS
Installation Instructions for
Heating & Cooling
Digital Model 850
5/1/1 Day Programmable
Thermostat
Preparations | 1 |
Thermostat Details | 1 |
Removing Old Thermostat | 1 |
Mounting and Wiring | 2 |
Check Thermostat Operation | 4 |
Specifications | 7 |
Troubleshooting | 7 |
YOUR THERMOSTAT REPLACES
Description | 850 |
|
|
Standard Heat & Cooling Systems – 4 or 5 wires | Yes |
Standard Heat Only Systems | Yes |
Millivolt Heat Only Systems – Floor or Wall Furnaces | Yes |
Standard Central Air Conditioning | Yes |
Gas or Oil Heat | Yes |
Electric Furnace | Yes |
|
|
Hydronic (Hot Water) Zone Heat – 2 Wires | Yes |
|
|
Hydronic (Hot Water) Zone Heat – 3 Wires | No |
Heat Pump (No Aux or Emergency Heat) | Yes |
|
|
Heat Pump (with Aux or Emergency Heat) | No |
|
|
Baseboard Electric Heating or Line Voltage (120 or 240 volt) | No |
|
|
|
|
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)
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
Screw anchors
Mounting
holes Electric/Gas switch
Mounting holes
Figure 1. Thermostat base
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:
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 using the labels enclosed with the new 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. | ||
Replaces | ||
of Emerson Electric Co. | ||
0514 | ||
|
