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 |
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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 |
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Hydronic (Hot Water) Zone Heat – 2 Wires |
Yes |
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Hydronic (Hot Water) Zone Heat – 3 Wires |
No |
Heat Pump (No Aux or Emergency Heat) |
Yes |
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Heat Pump (with Aux or Emergency Heat) |
No |
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Baseboard Electric Heating or Line Voltage (120 or 240 volt) |
No |
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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 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.
White-Rodgers is a division |
PART NO. 37-6295B |
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Replaces 37-6295A |
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of Emerson Electric Co. |
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0514 |
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www.white-rodgers.com |
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3 REMOVING OLD THERMOSTAT
CONTINUED FROM FIRST PAGE
ATTENTION! This product does not contain mercury. However, this product may replace a unit which contains mercury.
Do not open mercury cells. If a cell becomes damaged, do not touch any spilled mercury. Wearing non-absorbent gloves, take up the spilled mercury and place into a container which can be sealed. If a cell becomes damaged, the unit should be discarded.
Mercury must not be discarded in household trash. When the unit this product is replacing is to be discarded, place in a suitable container and return to White-Rodgers for proper disposal.
4 MOUNTING AND WIRING
!WARNING
Do not use on circuits exceeding specified voltage. Higher voltage will damage control and could cause shock or fire hazard.
Do not short out terminals on gas valve or primary control to test. Short or incorrect wiring will damage thermostat and could cause personal injury and/or property damage.
Thermostat installation and all components of the system shall conform to Class II circuits per the NEC code.
Electric Heat or Single Stage
Heat Pump Systems
This thermostat is configured from the factory to operate a heat/ cool, fossil fuel (gas, oil, etc.), forced air system. It is configured correctly for any system that DOES NOT require the thermostat to energize the fan on a call for heat. If your system is an electric or heat-pump system that REQUIRES the thermostat to turn on the fan on a call for heat, locate the GAS/ELECTRIC switch (see fig. 1) and switch it to the ELECTRIC position. This will allow the thermostat to energize the fan immediately on a call for heat. If you are unsure if the heating/cooling system requires the thermostat to control the fan, contact a qualified heating and air conditioning service person.
Hydronic (Hot Water or Steam)
Heating Systems
This thermostat is set to operate properly with a forced-air heating system. If you have a hydronic heating system (a system that heats with hot water or steam), you must set the thermostat to operate properly with your system. Change the second option in the configuration menu to SL (see CONFIGURATION MENU, page 5).
! CAUTION
Take care when securing and routing wires so they do not short to adjacent terminals or rear of thermostat. Personal injury and/or property damage may occur.
TERMINAL CROSS REFERENCE CHART
New Thermostat |
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Other Manufacturers’ |
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Terminal Designation |
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Terminal Designation |
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RH |
4 |
RH |
M |
* |
* |
R5 |
R |
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RC |
R |
R |
V |
- |
- |
G |
G |
G |
F |
G |
G |
W |
W |
W |
H |
4 |
W |
Y |
Y |
Y |
C |
Y6 |
Y |
*These are four-wire, single-transformer systems. Factory installed jumper wire between the RH and RC terminals must remain in place.
Attach Thermostat Base to Wall
1.Remove the packing material from the thermostat. Gently pull the cover straight off the base. Forcing or prying on the thermostat will cause damage to the unit. If necessary, move the electric heat switch (see ELECTRIC HEAT SYSTEMS, above).
2.Connect wires beneath terminal screws on base using appropriate wiring schematic (see figs. 2 through 7).
3.Place base over hole in wall and mark mounting hole locations on wall using base as a template.
4.Move base out of the way. Drill mounting holes.
5.Fasten base loosely to wall, as shown in fig. 1, using two mounting screws. Place a level against bottom of base, adjust until level, and then tighten screws. (Leveling is for appearance only and will not affect thermostat operation.) If you are using existing mounting holes, or if holes drilled are too large and do not allow you to tighten base snugly, use plastic screw anchors to secure base.
6.Push excess wire into wall and plug hole with a fire-resistant material (such as fiberglass insulation) to prevent drafts from affecting thermostat operation.
Battery Location
This thermostat requires 2 “AA” alkaline batteries to operate. If the word LO BATTERY is displayed, the batteries are low and should be replaced with fresh “AA” Energizer® alkaline batteries. To replace the batteries, install the batteries along the top of the base (see fig. 1). The batteries must be installed with the positive(+) ends to the right.
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4 MOUNTING AND WIRING
CONTINUED FROM SECOND PAGE
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JUMPER |
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WIRE |
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C‡ B |
O |
Y |
G |
W |
RC RH |
THERMOSTAT |
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SYSTEM |
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Fan |
Heating |
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Relay |
System |
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Hot |
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NOTE |
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24 VAC |
120 VAC |
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For 2-wire Heat only, |
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Neutral |
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attach to RH and W |
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TRANSFORMER |
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Figure 2. Typical wiring diagram for heat only, 3-wire, single transformer systems
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JUMPER |
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WIRE |
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C‡ |
B |
O |
Y |
G W |
RC RH |
THERMOSTAT |
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SYSTEM |
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Cooling |
Fan |
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System |
Relay |
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Hot |
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24 VAC |
120 VAC |
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Neutral |
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TRANSFORMER |
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Figure 3. Typical wiring diagram for cool only, 3-wire, single transformer systems
NOTE |
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RED jumper wire (provided with thermostat) must be |
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connected between thermostat RH and RC terminals |
JUMPER |
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for proper thermostat operation with this system. |
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WIRE |
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THERMOSTAT |
C‡ |
B |
O |
Y |
G |
W |
RC RH |
SYSTEM |
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Cooling |
Fan |
Heating |
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System |
Relay |
System |
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Hot |
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24 VAC |
120 VAC |
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Neutral |
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TRANSFORMER |
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Figure 4. Typical wiring diagram for heat/cool, 4-wire, single transformer systems
‡The 24 Volt neutral connection to terminal C on the thermostat is not required if the batteries are replaced once a year with fresh “AA” Energizer® alkaline batteries.
THERMOSTAT
C‡ B |
O |
Y |
G |
W |
RC |
RH |
SYSTEM |
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Cooling |
Fan |
Heating |
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Hot |
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24 VAC |
120 VAC |
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System |
Relay |
System |
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Neutral |
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HEATING |
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TRANSFORMER |
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Hot |
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24 VAC |
120 VAC |
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Neutral |
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COOLING TRANSFORMER |
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Figure 5. Typical wiring diagram for heat/cool, 5-wire, two-transformer systems
JUMPER |
JUMPER |
WIRE |
WIRE |
C‡ B O |
Y |
G W |
RC RH |
THERMOSTAT |
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SYSTEM |
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Reversing |
Compressor |
Fan |
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Valve* |
Contactor |
Relay |
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Hot |
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24 VAC |
120 VAC |
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* Reversing valve is energized when the |
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Neutral |
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system switch is in the COOL position |
TRANSFORMER |
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Figure 6. Typical wiring diagram for heat pump with reversing valve energized in COOL
JUMPER |
JUMPER |
WIRE |
WIRE |
C‡ |
B O |
Y |
G W |
RC RH |
THERMOSTAT |
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SYSTEM |
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Reversing Compressor |
Fan |
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Valve* |
Contactor |
Relay |
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Hot |
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24 VAC |
120 VAC |
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* Reversing valve is energized when the |
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Neutral |
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system switch is in the HEAT position |
TRANSFORMER |
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Figure 7. Typical wiring diagram for heat pump with reversing valve energized in HEAT
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