Emerson 850- User Manual
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Table of Contents:
- Page 2 – MOUNTING AND WIRING; CAUTION; REMOVING OLD THERMOSTAT; CONTINUED FROM FIRST PAGE; WARNING; Electric Heat or Single Stage; TERMINAL CROSS REFERENCE CHART
- Page 3 – CONTINUED FROM SECOND PAGE; Figure 3. Typical wiring diagram for
- Page 4 – CHECK THERMOSTAT OPERATION; The Display; “LO” in the minutes field when batteries are low.; CONFIGURATION MENU; Fan Operation; F, DO NOT operate the; The Thermostat Buttons and Switches
- Page 5 – CONTINUED FROM FOURTH PAGE; OPERATING FEATURES; Configuration Menu; Step; Displayed
- Page 6 – PROGRAMMING YOUR THERMOSTAT; Entering Your Program; Set Current Time and Day; Enter Heating Program; CONTINUED FROM FIFTH PAGE
- Page 7 – No Heat; SPECIFICATIONS; Operating Ambient Temperature Range:; TROUBLESHOOTING; Enter Cooling Program; If the outside temperature is below 50; Check Your Programming; CONTINUED FROM SIXTH PAGE
- Page 8 – CONTINUED FROM SEVENTH PAGE
Installation Instructions for
Heating & Cooling
Digital Model 850
5/1/1 Day Programmable
Thermostat
CONTENTS
Preparations .................................................. 1
Thermostat Details ........................................ 1
Removing Old Thermostat ............................ 1
Mounting and Wiring ..................................... 2
Check Thermostat Operation ........................ 4
Specifications ................................................ 7
Troubleshooting ............................................ 7
PREPARATIONS
THERMOSTAT DETAILS
REMOVING OLD THERMOSTAT
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 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.
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.
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.
CAUTION
!
PART NO. 37-6295B
Replaces 37-6295A
0514
Failure to follow and read all instructions carefully
before installing or operating this control could cause
personal injury and/or property damage.
Assemble tools required as shown below.
YOUR THERMOSTAT REPLACES
1
2
3
WIRE CUTTER/STRIPPER
HAND OR POWER
DRILL WITH 3/16 INCH
DRILL BIT, IF NEEDED
FLAT BLADE SCREWDRIVER
SPIRIT LEVEL OR PLUMB BOB AND LINE (OPTIONAL)
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
Mounting
holes
Mounting
holes
Electric/Gas
switch
Screw anchors
Figure 1. Thermostat base
White-Rodgers is a division
of Emerson Electric Co.
www.white-rodgers.com
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Summary
MOUNTING AND WIRING Take care when securing and routing wires so they donot short to adjacent terminals or rear of thermostat.Personal injury and/or property damage may occur. CAUTION ! ATTENTION! This product does not contain mercury. How-ever, this product may replace a unit which contains mercury...
www.white-rodgers.com MOUNTING AND WIRING CONTINUED FROM SECOND PAGE 4 ‡ The 24 Volt neutral connection to terminal C on thethermostat is not required if the batteries are replacedonce a year with fresh “AA” Energizer ® alkaline batteries. RH 24 VAC 120 VAC Hot Neutral THERMOSTAT SYSTEM G W Figure 2...
CHECK THERMOSTAT OPERATION www.white-rodgers.com 5 The Display 9 Indicates day of the week. 10 Flame icon ( ) is displayed when the SYSTEM switch is in the HEAT position. Snowflake icon ( )is displayed (non-flashing) when the SYSTEM switch is in the COOL position.Snowflake is displayed (flashing) if...
