Emerson 850 User Manual download pdf

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

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

1 2 3 4 5 6 7 8

Summary of Contents

Page 1 - Digital Model 850

Installation Instructions forHeating & CoolingDigital Model 8505/1/1 Day ProgrammableThermostatCONTENTSPreparations ...

Page 2 - REMOVING OLD THERMOSTAT

MOUNTING AND WIRINGTake care when securing and routing wires so they donot short to adjacent terminals or rear of thermostat.Personal injury and/or pr

Page 3 - alkaline batteries

www.white-rodgers.comMOUNTING AND WIRINGCONTINUED FROM SECOND PAGE4‡The 24 Volt neutral connection to terminal C on thethermostat is not required if t

Page 4 - Cooling System

CHECK THERMOSTAT OPERATIONwww.white-rodgers.com5The Display9Indicates day of the week.10Flame icon ( ) is displayed when the SYSTEM switch is inthe HE

Page 5 - OPERATING FEATURES

www.white-rodgers.com1) Select Temporary Hold Time - The thermostat can hold anytemperature you set it to for the amount of time you select onthis opt

Page 6 - Entering Your Program

www.white-rodgers.comPROGRAMMING YOUR THERMOSTAT6This section will help you plan your thermostat’s program to meetyour needs. For maximum comfort and

Page 7 - Check Your Programming

Symptom Possible Cause Corrective ActionNo Heat/No Cool/No Fan 1. Blown fuse or tripped circuit breaker. Replace fuse or reset breaker.(common problem

Page 8 - TROUBLESHOOTING

Symptom Possible Cause Corrective ActionNo Heat (continued) 5. Heating system requires service or Diagonistic: Set SYSTEM Switch to HEAT andthermostat

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Emerson 850 User Manual

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Summary of Contents

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