YOUR THERMOSTAT REPLACES THERMOSTAT FEATURES

YOUR THERMOSTAT REPLACES THERMOSTAT FEATURES
3
REMOVING OLD THERMOSTAT (cont’d)
If no heat anticipator/indication is showing, do not be concerned; move on to the
next step.
ATTENTION! This product does not contain mercury. However, this product may
replace a unit which contains mercury.
Installation Instructions for:
Horizontal
Snap-Action
Vertical
Snap-Action
1F56N-444
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.
1E56N-444
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
at 2895 Harrison St., Batesville, AR 72501 for proper disposal.
YOUR THERMOSTAT REPLACES
System
Models
Standard Heating & Cooling Systems –
4 or 5 wires
Standard Heat Only Systems
Standard Central Air Conditioning
Gas or Oil Heat
Hydronic (Hot Water) Zone Heat – 2 wires
Electric Furnace
Heat Pump (No Aux or Emergency Heat)
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.
All Models
PREPARATIONS
Assemble tools required: power drill, flat blade screwdriver, wire cutter/stripper, level.
Failure to follow and read all instructions carefully before installing or operating this control could cause personal injury and/or property damage.
THERMOSTAT FEATURES
FAN
AUTO
SYSTEM
ON
COOL OFF
G
HEAT
RC
4
B
O
W
RH
Mounting Screw
A
KEEP THIS AREA
CLEAR OF WIRES
R
5
Y
6
Y
Hole
in Wall
Mounting Screw
Mounting Hole
Mounting Hole
Figure 1. Thermostat subbase and wallplate
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.
WARNING
Do not use on circuits exceeding specifi ed voltage. Higher voltage will
damage control and could cause shock or fire hazard.
None
Millivolt Heat Only Systems –
Floor or Wall Furnaces
Hydronic (Hot Water) Zone Heat – 3 wires
2
MOUNTING AND WIRING
!
All Models
Heat Pump (with Aux or Emergency Heat)
Baseboard Electric Heating or Line Voltage
(120 or 240 Volt)
1
4
The switching subbase, which is removed by unscrewing the mounting
screws that hold it on the wall or adaptor plate.
Make a note here
of the anticipator setting on the old thermostat for
future reference and use in step 5.
The heat anticipator pointer, if adjustable, will be set at one of a series of numbers
representing the current rating of the primary control in your furnace. The number will
be one of the following: .2, .4, .8, etc. or 0.2, 0.4, 0.8, etc.
A. Remove base from subbase: Loosen the screws on the base and remove.
B. Mount switching subbase: Use the screws provided to mount the subbase or
wallplate to wall (see Fig. 1).
C. Attach wires to appropriate terminals:
• For two wire systems (Heat Only or Cool Only). Replace subbase with wallplate. If you have a two-wire Heat Only system, attach one wire to R and one to
wire W. If you have a two-wire Cool Only system, attach one wire to R and one to
wire to Y. Tighten any unused terminals securely. (see Fig. 5 and 6).
• If your system has more than two wires: Use the cross reference chart to
determine correct wire connections. If you have a four-wire heat/cool system leave
the factory installed jumper between RC and RH attached (see Fig 2.). If your system has five wires remove the factory installed jumper between RC and RH (see
Fig 3.).
• Electric heat or single stage heat pump systems: These thermostats are
configured from the factory to operate a heat/cool, fossil fuel (gas, oil, etc.) forced
air system. This is correct for any system that DOES NOT require the thermostat
to energize the fan on a call for heat. If your system is an electric heat or heatpump system that REQUIRES the thermostat to turn on the fan on a call for heat,
remove the yellow factory-installed jumper wire from the Y terminal and connect
it to the A terminal. This will allow the thermostat to energize the fan immediately
on a call for heat. If you are unsure if the heating system requires the thermostat
to control the fan, contact a qualified heating and air conditioning service person.
For single stage heat pump applications (no auxillary heat), install a short jumper
wire (not included) across terminals W and Y. If the system has a reversing valve
connection energized in Cooling, attach it to O. If the system has a reversing valve
connection energized in Heating, attach it to B (see Fig. 4). This thermostat will not
provide multi-stage heating or cooling.
D. Mount Thermostat Base: Gently push excess wire back into the wall opening
and plug hole with a fire-resistant material, such as fiberglass insulation to prevent
drafts from affecting thermostat operation. Mount the thermostat base to the subbase using the three captive screws on the thermostat base. (See Fig. 1) Tighten
the screws securely. Proceed to Step #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
Other Manufacturers’
Terminal Designation
Terminal Designation
*
*
RH
4
RH
M
R5
R
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.
White-Rodgers is a division
of Emerson Electric Co.
www.white-rodgers.com
PART NO. 37-6881A
0730
5
SET HEAT ANTICIPATOR
RH
Set anticipator to match the setting of your old thermostat you noted in Step 3, or, the
anticipator should be set to match the current rating stamped on your main heating
control. The heat anticipator is adjustable from 0.15 to 1.2 amps. Adjust the anticipator by rotating the contact arm (see fig. 5). The anticipator setting is indicated by the
numbers on the base that the pointer points to. If you are unsure where to set the
anticipator contact the heater manufacturer for a recommended setting.
Move the pointer counterclockwise to
lengthen heating system cycles; move
clockwise to shorten heating cycles.
Adjustments should not be greater than
1/2 marking at a time.
O
Y
G
Compressor
Relay
Fan
Relay
RC
A
Neutral
TRANSFORMER
Figure 2. Typical wiring for single transformer heating/cooling system
RH
W
TRANSFORMER
Hot
B
A
O
Heat
Relay
Y
G
Compressor
Relay
Fan
Relay
24 VAC
120 VAC
RC
TRANSFORMER
Hot
24 VAC
120 VAC
Neutral
Neutral
Figure 3. Typical wiring for two-transformer heating/cooling system
Millivolt Link
Arrow points to the
current rating of
the primary control
Figure 5. Anticipator adjustment
Factory-Installed Jumper
RC
G
TRANSFORMER
NEW THERMOSTAT OPERATION
Field-Installed Jumper
RH
O
Fan
Relay
Hot
6
B
24 VAC
120 VAC
Rotate contact arm
to adjust heat anticipator
For millivolt operation, rotate contact arm to
Millivolt Link.
Snap on Cover: Carefully align the cover
with the base and snap the cover onto
the base.
W
Hot
*
Y
B
Compressor
Relay
**
A
24 VAC
120 VAC
Neutral
Terminal energized
Terminal energized
* in cooling
Thermostat on Subbase. After power is turned on, use the system switch to select
either heating or cooling, or to turn the heating/cooling system off. Use the fan switch
to control fan operation. When the fan switch is in the AUTO position, the fan will
cycle with the heating or cooling system (the fan will not run if the system switch is
in the OFF position and the fan switch is in the AUTO position). When the fan switch
is in the ON position, the fan will run continuously, regardless of system switch position (even if the system switch is set to OFF, the fan will run if the fan switch is in the
ON position).
W
* * in heating
Figure 4. Typical wiring for single transformer, single stage heat pump system
R
120 VAC
W
Y
Heat
Relay
Hot
24 VAC
Neutral
TRANSFORMER
Thermostat on wallplate. For heat only move the temperature lever to the highest
temperature. For cool only move the temperature lever to the lowest temperature.
7
Figure 5. Typical wiring for single transformer heating system
SPECIFICATIONS
ELECTRICAL DATA
Switch Rating......................................
Heating..................................................
Cooling..................................................
Anticipator Rating:
Heating..................................................
Cooling..................................................
R
W
24 VAC (30 VAC max.)
0.15 to 1.2 Amps
0 to 1.5 Amps
Adjustable from 0.15 to 1.2 Amps
Fixed
120 VAC
Y
Compressor
Relay
Hot
24 VAC
Neutral
TRANSFORMER
Figure 6. Typical wiring for single transformer cooling system
THERMAL DATA:
Temperature Range............................. 50°F to 90°F (10°C to 32°C)
Operating Humidity Range................. 0 – 90% noncondensing
THERMOSTAT
6
MV
B
O
Y
G
W
RC
RH
SYSTEM
6 4 5
Zone
Valve
1
2
Hot
24 VAC
120 VAC
Neutral
TRANSFORMER
Figure 7. Typical wiring diagram heat only, 3-wire zone valve systems
8
TROUBLESHOOTING
Symptom
Possible Cause
Corrective Action
No Heat/No Cool/No Fan
(common problems)
1. Blown fuse or tripped circuit breaker.
2. Furnace power switch to OFF.
3. Furnace blower compartment door or
panel loose or not properly installed.
Replace fuse or reset breaker.
Turn switch to ON.
Replace door panel in proper position to engage
safety interlock or door switch.
No Heat
1. Pilot light not lit.
2. Broken or melted anticipator wire.
Re-light pilot.
Excessive current or dead short in system. Have a qualified service person check the system before
replacing thermostat.
Verify thermostat and system wires are securely attached.
Your furnace manufacturer or service person can describe how to test the heating system to verify it is
operating correctly. If the heating system is capable of operation and the no heat condition persists,
replace the thermostat.
Set System Switch to Heat and raise temp above room temp.
3. Loose connection to thermostat or system.
4. Thermostat or heating system requires
replacement or service.
5. System Switch not set to Heat.
Intermittent Heat
1. Furnace Lock-Out Condition
Many furnaces have safety devices that shut the system down when a lock-out condition occurs. If the
heat works intermittently contact the furnace manufacturer or local service person for assistance.
No Cool
1. Loose connection to thermostat or system.
2. Thermostat or cooling system requires
replacement or service.
Verify thermostat and system wires are securely attached.
Your cooling system manufacturer or service person can describe how to test the cooling system to
verify it is operating correctly. If the cooling system is capable of operation and the no cooling condition
persists, replace the thermostat.
Set System Switch to Cool and lower temp below room temp.
3. System Switch not set to Cool.
Heat, Cool or Fan Runs
Constantly.
1. Possible short in wiring.
2. Possible short in thermostat.
3. Possible short in heat/cool/fan system.
Check each wire connection to the thermostat to verify it is neatly looped under the terminals. No extra
wire should stick out from under the terminals.
Furnace Cycles Too Fast
or Too Slow Narrow or
wide temperature swing
See Step 5, Adjusting the Anticipator.
The anticipation setting is the only adjustment that effects the heating cycle rate. If an acceptable cycle rate
is not achieved using the anticipator contact a local service person for additional suggestions. The location of
the thermostat, size of the Heat/Cool System and current draw can influence the cycle rate.
Cooling Cycles Too Fast
or Too Slow (narrow or
wide temperature swing)
1. Poor thermostat location for sensing room
The cycle rate for cooling can not be adjusted. The location of the thermostat, size of the Cool system and
temperature.
current draw can influence the cycle rate. Contact a local service person for suggestions.
2. Cooling system over or undersized.
3. Excessive Current draw influencing thermostat.
Thermostat Setting and
Thermostat Thermometer
Disagree
1. Thermostat thermometer setting requires
adjustment.
2. Thermostat setting lever requires calibration.
The thermometer can be adjusted by using a standard slotted screwdriver. Turn the thermometer pointer
screw located inside the front cover to change the setting. For calibrating the setting lever contact a local
heating and cooling service person.
Adjusting Thermometer
1. Thermostat thermometer disagrees with
other room thermometers.
The thermometer on the thermostat is accurately calibrated at our factory but you can adjust it by using a
standard slotted screwdriver. Turn the thermometer pointer screw located inside the front cover to change
the setting.
HOMEOWNER HELP LINE: 1-800-284-2925
The Emerson logo is a
trademark and service mark
of Emerson Electric Co.
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