White Rodgers 1f81-51 User Manual
WHITE-RODGERS
Operator: Save these instructions for future use!
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY
BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE
PERSONAL INJURY AND/OR PROPERTY DAMAGE.
Your new White-Rodgers 5-Day/2-Day Digital Multi-stage Thermostat uses the technology of a solid-state microcomputer to
provide precise time/temperature control. This thermostat offers
you the flexibility to design heating and cooling programs that fit
your needs.
Features:
• Separate 5-day (weekday) and 2-day (weekend) programming
with four separate time/temperature periods per program
• Simultaneous heat and cool program storage
• Optional C terminal (dual power option)
1F81-51
Programmable Electronic
Digital Multi-stage Thermostat
INSTALLATION AND
OPERATION INSTRUCTIONS
DESCRIPTION
• Preprogrammed temperature control
• LCD continuously displays set point, and alternately displays time and room temperature
• Temperature override until next program period
• Manual program override (HOLD temperature)
• °F/°C convertibility
• Temperature range 45° to 90°F
• Two-stage heat/two-stage cool
• Armchair Programming Capability
This thermostat is intended for use with a 24-volt system; do not
use this thermostat with a millivolt or line voltage system. If in
doubt about whether your wiring is millivolt, line, or low voltage,
have it inspected by a qualified heating and air conditioning
contractor or electrician.
Do not exceed the specification ratings.
All wiring must conform to local and national electrical codes and
ordinances.
This control is a precision instrument, and should be handled
carefully. Rough handling or distorting components could cause
the control to malfunction.
ELECTRICAL DATA
Electrical Rating:
20 to 30 VAC 50/60 Hz. or D.C.
0.05 to 1.5 Amps (Load per terminal)
1.5 Amps Maximum Total Load (All terminals combined)
THERMAL DATA
Setpoint Temperature Range:
45°F to 90°F (7°C to 32°C)
Operating Ambient Temperature Range:
32°F to 105°F
Operating Humidity Range:
0 to 90% RH (non-condensing)
Shipping Temperature Range:
-40°F to 150°F
PRECAUTIONS
CAUTION
!
To prevent electrical shock and/or equipment damage
disconnect electric power to system at main fuse or
circuit breaker box until installation is complete.
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.
SPECIFICATIONS
APPLICATIONS
For use with:
• Heat/cool systems with up to two stages heat, two
stages cool
DO NOT USE WITH:
• Millivolt systems
• Systems exceeding 30 VAC and 2.5 amps
• 3-wire zoned hydronic heating systems
WHITE-RODGERS DIVISION
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
ST. LOUIS, MISSOURI 63123-5398
Printed in U.S.A.
PART NO. 37-5854E
Replaces 37-5854D
0004
INSTALLATION
REMOVE OLD THERMOSTAT
1. Shut off electricity at the main fuse box until installation is
complete. Ensure that electrical power is disconnected.
2. 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.
3. Identify each wire attached to the old thermostat using the
labels enclosed with the new thermostat.
4. Disconnect the wires from old thermostat one at a time. DO
NOT LET WIRES FALL BACK INTO THE WALL.
5. Install new thermostat using the following procedures.
GAS ELECTRIC
W901
CUT FOR
LONGER CYCLES
W903
CUT TO
DEFEAT EMR
PRE-INSTALLATION SET-UP
1. Remove the packing material from the thermostat.
2. This thermostat is configured from the factory to operate a
heat/cool, fossil fuel (gas, oil, etc.), forced air system with up
to 2 stages of heat and 2 stages of cool. 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 heat or heat-pump system that
REQUIRES the thermostat to turn on the fan on a call for
heat, locate the GAS/ELECTRIC switch on the back of the
thermostat (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.
3. Two jumpers are also located on the back of the thermostat,
so that you may customize the thermostat to meet your
individual preference (see fig. 1). In most applications, the
factory jumper settings provide the most comfortable and
convenient thermostat operation.
Jumper wire W901 determines how fast the system cycles
on and off, based on temperature change. As shipped from
the factory, the thermostat will maintain a very consistent
room temperature, usually within 1°F of the thermostat
setting. To achieve a slower on and off cycle, providing a
slightly wider temperature span, cut and separate jumper
wire W901.
Jumper wire W903 controls the Energy Management Recovery (EMR) feature. EMR allows the thermostat to energize
before
the heating system up to 30 minutes
grammed into the thermostat. The thermostat will then
energize the system to gradually raise the temperature to
your programmed temperature by using the most efficient
stage of heat practical.
For example, assume that the thermostat is programmed
overnight to 66°F and the room temperature is 66°. If the next
program is 7 AM, 70°F (an increase of 4°), the thermostat will
start the system 30 minutes before 7 AM. If the temperature
is in the room is within 2°F of your next programmed
temperature, the thermostat will not start the system early.
DO NOT clip jumper wire W903 unless you wish to permanently disable the EMR feature.
If LOW BATTERY is displayed, the batteries are low and
should be replaced with fresh “AA” Energizer
batteries. To replace batteries, install the batteries along the
top of the base (see fig. 2). The batteries must be installed
with the positive (+) ends to the left.
2
the time pro-
®
alkaline
Figure 1. Back of thermostat base
Alkaline batteries (3 “AA”–
install “+” ends to the left)
Screw anchors
C
W2
Reset
button
Mounting
holes
G
W
Y2
R
Y
Figure 2. Thermostat base
INSTALLING THE THERMOSTAT
1. Gently remove the cover by pulling it straight off the base.
Forcing or prying on the unit may cause damage to the unit.
2. Remove the battery tab. With the batteries installed, the
Armchair Programming feature allows you to program the
thermostat before installing it on the wall.
3. Pull wires through the hole in the thermostat base and place
the base over the hole in the wall. Mark mounting hole
locations on the wall using the base as a template.
4. Move the base out of the way. Drill mounting holes.
5. Fasten the base loosely to the wall, as shown in fig. 2, using
two mounting screws. Place a level against the bottom of the
base, adjust until level, and then tighten the screws. (Leveling is for appearance only and will not affect thermostat
operation.) If you are using existing mounting holes, or if the
holes drilled are too large and do not allow you to tighten the
base snugly, use plastic screw anchors to secure the base.
6. Check that the SYSTEM switch is in the OFF position.
Connect the wires beneath the terminal screws on the base
using the appropriate wiring diagram (see figs. 3 through 5).
7. Push excess wire into wall and plug hole with a fire-resistant
material (such as fiberglass insulation) to prevent drafts from
affecting thermostat operation.
(Instructions continue on page 4.)
NOTE NOTE
The following wiring diagrams show typical terminal identification and wiring. For proper installation, refer to the original
manufacturer's instructions.
Thermostat
Control
Circuit
Y2
Y W
Compressor
Contactor
Stage 2
Compressor
Contactor
Stage 1
Figure 3. Typical wiring diagram for single transformer systems
G
Fan
Relay
W2
Heat
Relay
Stage 1
Heat
Relay
Stage 2
C* R
Relay contacts shown are thermostatically operated.
* The 24 Volt neutral connection
to terminal C on the thermostat
is not required if you replace
THERMOSTAT
SYSTEM
Hot
24 VAC 120 VAC
Neutral
TRANSFORMER
Thermostat
Control
Circuit
the batteries once a year with
fresh “AA” Energizer
batteries.
* The 24 Volt neutral connection
to terminal C on the thermostat
is not required if you replace
the batteries once a year with
fresh “AA” Energizer® alkaline
batteries.
®
alkaline
CUT AND
TAPE OFF!
Hot
Neutral
TRANSFORMER
Y W
Compressor
24 VAC120 VAC
Compressor
BE JUMPERED TOGETHER!
Contactor
Contactor
Stage 1
TWO COMMONS MUST
Y2
Stage 2
G
Fan
Relay
Heat
Relay
Stage 1
W2
Heat
Relay
Stage 2
C* R
THERMOSTAT
SYSTEM
Hot
24 VAC 120 VAC
Neutral
TRANSFORMER
Figure 4. Typical wiring diagram for two-transformer systems with NO safety circuits
* The 24 Volt neutral connection
to terminal C on the thermostat
is not required if you replace
the batteries once a year with
fresh “AA” Energizer
batteries.
24 VAC 120 VAC
HEATING
TRANSFORMER
Limit or
Safety
Switches
COOLING
TRANSFORMER
Limit or
Safety
Switches
Y2
Y W
Compressor
Contactor
Stage 2
Compressor
Contactor
Stage 1
TWO COMMONS MUST
BE JUMPERED TOGETHER!
G
Fan
Relay
Heat
Relay
Stage 1
W2
Heat
Relay
Stage 2
Thermostat
Control
Circuit
C* R
Common
THERMOSTAT
SYSTEM
Limit or
Safety
Switches
24 VAC
Accessory
Relay N.O.
Contact
Common
Limit or
Safety
Switches
24 VAC 120 VAC
Figure 5. Typical wiring diagram for two-transformer systems with safety circuits in BOTH systems
®
alkaline
Hot
Neutral
Hot
Neutral
3
Loading...