1F83-51
Non-Programmable Electronic
Digital Multi-Stage Thermostat
INSTALLATION AND
WHITE-RODGERS
OPERATION INSTRUCTIONS
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.
DESCRIPTION
Your new White-Rodgers Digital Multi-stage Thermostat uses
thetechnologyofasolid-statemicrocomputertoprovideprecise
temperature control.
• LCD continuously displays room temperature
• °F/°C convertibility
• Temperature range 45° to 90°F
• Two-stage heat/two-stage cool
Features:
• Simultaneous heat and cool program storage
• Optional C terminal (dual power option)
PRECAUTIONS
CAUTION
Thisthermostatisintendedforusewitha24-voltsystem;donot
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.
!
To prevent electrical shock and/or equipment
damage, disconnect electric power to system at
main fuse or circuit breaker box until installation
is complete.
Do not exceed the specification ratings.
Allwiringmustconformtolocalandnationalelectricalcodesand
ordinances.
WARNING
!
Do not use on circuits exceeding specified voltage.
Higher voltage will damage control and could cause
shock or fire hazard.
This control is a precision instrument, and should be handled
carefully. Roughhandlingordistortingcomponentscouldcause
the control to malfunction.
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
ELECTRICAL DATA
APPLICATIONS
Electrical Rating:
For use with:
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)
• Heat/cool systems with up to two stages heat, two
stages cool
DO NOT USE WITH:
THERMAL DATA
• Millivolt systems
Setpoint Temperature Range:
45°F to 90°F (7°C to 32°C)
• Systems exceeding 30 VAC and 1.5 amps
• 3-wire zoned hydronic heating systems
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
WHITE-RODGERS DIVISION
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
PART NO. 37-5916C
Printed in U.S.A.
Replaces 37-5916B
0005
ST. LOUIS, MISSOURI 63123-5398
NOTE
NOTE
The following wiring diagrams show typical terminal identifica- Relay contacts shown are thermostatically operated.
tion and wiring. For proper installation, refer to the original
manufacturer's instructions.
* The 24 Volt neutral connection
to terminal C on the thermostat
is not required if you replace
Thermostat
the batteries once a year with
Control
fresh “AA” Energizer® alkaline
Circuit
batteries.
THERMOSTAT
W2
C*
R
Y
Y2
G
W
SYSTEM
Heat
Relay
Compressor
Contactor
Stage 2
Stage 1
Hot
24 VAC
120 VAC
Neutral
Compressor
Contactor
Stage 1
Heat
Relay
Fan
Relay
TRANSFORMER
Stage 2
Figure 3. Typical wiring diagram for single transformer systems
* 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.
Thermostat
Control
Circuit
THERMOSTAT
SYSTEM
CUT AND
TAPE OFF!
W2
C*
R
Y
Y2
G
W
Hot
Heat
Relay
Compressor
Contactor
Stage 2
120 VAC
24 VAC
Stage 1
Hot
Neutral
24 VAC
120 VAC
TRANSFORMER
Compressor
Contactor
Stage 1
Heat
Relay
Neutral
TRANSFORMER
Fan
Relay
Stage 2
TWO COMMONS MUST
BE JUMPERED TOGETHER!
Figure 4. Typical wiring diagram for two-transformer systems with NO safety circuits
* The 24 Volt neutral connection
Thermostat
to terminal C on the thermostat
Control
is not required if you replace
Circuit
the batteries once a year with
fresh “AA” Energizer® alkaline
THERMOSTAT
SYSTEM
batteries.
W2
C*
R
Y
Y2
G
W
Heat
Relay
Compressor
Contactor
Stage 2
Limit or
Safety
Switches
Stage 1
Limit or
Safety
Switches
Hot
24 VAC
120 VAC
Neutral
Compressor
Contactor
Stage 1
Heat
Relay
Fan
24 VAC
Accessory
Relay N.O.
Contact
HEATING
TRANSFORMER
Relay
Stage 2
Common
Limit or
Safety
Switches
Limit or
Safety
Switches
Hot
TWO COMMONS MUST
BE JUMPERED TOGETHER!
24 VAC
120 VAC
Common
Neutral
COOLING
TRANSFORMER
Figure 5. Typical wiring diagram for two-transformer systems with safety circuits in BOTH systems
3
If the fan is running but the compressor is not running and
the display has CLflashing, the compressor lockout feature
is operating (see Lockout Bypass Option to temporarily
override the compressor lockout feature during testing).
CHECK THERMOSTAT OPERATION
NOTE
If at any time during testing, your system does not operate
properly, contact a qualified serviceperson.
3. Press
toadjusttemperaturesettingaboveroomtempera-
ture. The cooling system should stop operating.
Fan Operation
1. Turn on power to the system.
LOCKOUT BYPASS OPTION
2. Move SYSTEM switch to OFF position.
3. MoveFANswitchtoON.Theblowershouldbegintooperate.
FOR QUALIFIED SERVICE TECHNICIANS’ USE
ONLY.OPERATORSSHOULDNOTUSETHISFEA-
TURE DUE TO POSSIBILITY OF EQUIPMENT OR
PROPERTY DAMAGE, OR PERSONAL INJURY.
4. Move FAN switch to AUTO position. The blower should stop
within a short period of time.
Heating System
1. Move SYSTEM switch to HEAT position
COMPRESSOR SHORT TERM
CYCLE PROTECTION
2. Press
toadjustthermostatsettingto90° andholdforfive
seconds. Both stages of the heating system should begin to
operate within five seconds.
During normal operation, this thermostat has a built-in
short term (5-minute) time delay. During this 5-minute
period, the thermostat will lock out the compressor to
allow head pressure to stabilize. If you want to over-
ride this feature while testing thermostat operation,
3. Press
toadjusttemperaturesettingbelowroomtempera-
ture. The auxiliary heating system will stop immediately and
the first stage will stop within three to four minutes.
simply press
and
buttons at the same time with
Cooling System
the SYSTEM switch in the OFF position.
CAUTION
!
DO NOT USE THE LOCKOUT BYPASS OPTION
UNLESSTHECOMPRESSOROILHEATERSHAVE
BEEN OPERATIONAL FOR 6 HOURS AND THE
SYSTEM HAS NOT BEEN OPERATIONAL FOR AT
LEAST 5 MINUTES.
Topreventcompressorand/orpropertydamage, ifthe
outdoor temperature is below 50°F, DO NOT operate
the cooling system.
1. Move SYSTEM switch to COOL position.
2. Press
toadjustthermostatsettingto45° andholdforfive
seconds. The blower should come on immediately on high
speed, followed by cold air circulation. Both stages of the
cooling system should begin to operate (if you have a two-
stage cooling system).
4
OPERATION
Before you begin using your thermostat, you should be familiar
with its features and with the display and the location and
operation of the thermostat buttons. Your thermostat consists of
two parts: the thermostat cover and the base. To remove the
cover, gently pull it straight out from the base. To replace the
cover, line up the cover with the base and press gently until the
cover snaps onto the base.
1
2
THE THERMOSTAT BASE
FAN ON
AUTO
SYSTEM
Other than
and
, the following buttons and switches are
COOL-OFF-HEAT
located behind the door on the bottom of the thermostat cover
(see fig. 6). Pull the door down to open it.
The Thermostat Buttons and Switches
3
4
(Red arrow) Raises temperature setting.
(Blue arrow) Lowers temperature setting.
FAN switch (ON, AUTO).
1
2
3
4
5
HEAT 1+2
OFF
6
COOL 1+2
LOW BATTERY
SYSTEM switch (COOL, OFF, HEAT).
7
8
5
The Display
Figure 6. Thermostat display, buttons, and switches
5
HT is displayed when the SYSTEM switch is in the HEAT
position. When calling for the first stage of heat, HT1 will
display. When calling for the second stage of heat, HT1+2
will display. CL is displayed (non-flashing) when the SYS-
TEM switch is in the COOL position. When calling for the
first stage of cool, CL1 will display. When calling for the
second stage of cool, CL1+2 will display. CL is displayed
(flashing) when the compressor is in lockout mode.
• °F/°C CONVERTIBILITY— When the thermostat is in the
temperature display adjustment mode, or 30 seconds after
power up, pressing
and
at the same time will switch
the LCD temperature display between Fahrenheit and
Celsius.
• TEMPERATURE DISPLAY ADJUSTMENT — Your new
thermostathasbeenaccuratelysetinourfactory.However,
if you wish, you may adjust your new thermostat tempera-
ture display to match your old thermostat. This can be
accomplished (within a ±4°F range) as follows:
Displays current temperature.
6
7
LOW BATTERY is displayed when the 3 "AA" batteries are
low and should be replaced. Nothing else will be displayed.
Displays current setpoint temperature. This is blank when
SYSTEM switch is in the OFF position.
8
1. Move the SYSTEM switch to OFF position.
2. Press and hold
and move the SYSTEM switch to
HEAT or COOL. Release
.
OPERATING FEATURES
Now that you are familiar with the thermostat buttons and
display, read the following information to learn about the many
features of the thermostat.
3. Press
or
to adjust the displayed temperature to
your desired setting. After setting your desired tempera-
ture, do not press any buttons for ten seconds. The
thermostat will continue operating at the changed tem-
perature setting.
• TEMPERATURE SETPOINT — Press
or
until the
display shows the temperature you want.
4. Pressing the hardware RESET button (see Fig. 2) will
return the offset to zero.
• SIMULTANEOUSHEATING/COOLINGSTORAGE—You
can enter both your heating and cooling setpoints at the
same time. There is no need to reset the thermostat at the
beginning of each season.
• LOW BATTERY INDICATOR — If the 3 “AA” alkaline
batteries are low and should be replaced, the display will be
blank except for the word LOW BATTERY. When the
batteries are low, pressing any button will cause the display
to operate for ten seconds. After ten seconds, the display
willbeblankexceptforthewordLOWBATTERY.Whenthe
duration of a low battery condition exceeds four weeks, the
setpoint is altered by 10 degrees to signal that the batteries
must be replaced.
TROUBLESHOOTING
If your thermostat’s display is frozen or displaying incorrectly,
the thermostat may have been affected by static discharge or
voltagevariations. Ifthishappens, presstheRESETbutton(see
fig. 2, page 2 for the location of the button). If pressing the
RESET button does not correct the problem, contact a qualified
service technician.
For optimum performance, we recommend replacing batteries
once a year with fresh “AA” Energizer® alkaline batteries.
5
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