1F94-80
Multi-stage Electronic Digital Thermostat
WHITE-RODGERS
INSTALLATION 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
This wall-mounted, low voltage thermostat maintains
room temperature by controlling the operation of multi-
stage systems. Use this thermostat for applications re-
quiring up to two stages of heat and/or cool. Indicator
lights show the system status. The user will program two
time/temperature settings per 24 hour period. The ther-
mostat stores programs for seven independent days. The
thermostat will store both heating and cooling programs
simultaneously. A 9 volt Energizer® battery will maintain
the stored program for approximately one week, if incom-
ing power should fail. If power failure is extensive and the
program is lost, after power restoration, the thermostat
willautomaticallymaintainafactorypreprogrammedheat-
ing temperature of 64°F or a cooling temperature of 82°F.
PRECAUTIONS
Ifindoubtaboutwhetheryourwiringismillivolt,line,orlow All wiring must conform to local and national electrical
voltage, have it inspected by a qualified heating and air codes and ordinances.
conditioning contractor, electrician, or someone familiar
with basic electricity and wiring.
This control is a precision instrument, and should be
handled carefully. Rough handling or distorting compo-
nents could cause the control to malfunction.
Do not exceed the specification ratings.
CAUTION
!
CONTENTS
Description ......................................................... 1
Precautions ........................................................ 1
Specifications..................................................... 2
Installation.......................................................... 2
New Installation
To prevent electrical shock and/or equipment
damage, disconnect electric power to system, at
mainfuseorcircuitbreakerbox,untilinstallation
is complete.
Select Thermostat Location
Route Wires to Location
WARNING
!
Replacement Installation
Remove Old Thermostat
Do not use on circuits exceeding specified volt-
age. Higher voltage will damage control and
could cause shock or fire hazard.
Attach Subbase to Wall
Attach Thermostat to Subbase
Operation ........................................................... 5
System Configuration
Set Option Switches
Do not short out terminals on gas valve or pri-
marycontroltotest. Shortorincorrectwiringwill
burn out thermostat and could cause personal
injury and/or property damage.
Check Thermostat Operation
Fan Operation
Heating System
Cooling System
Troubleshooting
WHITE-RODGERS DIVISION
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
ST. LOUIS, MISSOURI 63123-5398
PART NO. 37-5185A
Printed in U.S.A.
9329
R
REPLACEMENT INSTALLATION
REMOVE OLD THERMOSTAT
1. Shut off electricity at the main fuse box until installa-
tion is complete. Verify power is off with a voltmeter.
2. Remove the front cover of the old thermostat. With
wires still attached, remove wall plate from the wall.
PULL STRAIGHT OUT
3. If the old thermostat has a wall mounting plate,
removethethermostatandthewallmountingplateas
an assembly.
Figure 2. Removing thermostat from subbase
4. UsetheCrossReferenceGuidetofindthethermostat
type you are replacing.
TABLE 1. WIRE IDENTIFICATION LABELS
5. Identify each wire attached to the old thermostat
using the labels enclosed with the new thermo-
stat. Record the identification of the wire on the
corresponding blank in Table 2.
1
2
3
L
4
5
6
7
8
G
C
R
O
B
E1
E2
G
1
C
2
L
3
R
4
O
5
B
6
E1
7
E2
8
6. Disconnect the wires from old thermostat one at a
time. Pull at least 6 inches of wire out of the wall. DO
NOT LET WIRES FALL BACK INTO THE WALL.
11
9
10
Y2
12
13
A1
14
S1
15
S2
16
S3
W1
Y1
W2
W1
11
Y1
9
Y2
10
W2
12
A1
13
S1
14
S2
15
S3
16
7. Install new thermostat using the following proce-
dures.
ATTACH SUBBASE TO WALL
NOTE
THIS THERMOSTAT REQUIRES BOTH THE HOT AND
COMMON SIDES OF THE 24vAC TRANSFORMER TO
BE PRESENT TO THE THERMOSTAT FOR OPERA-
TION.
1. Remove the packing material from the thermostat.
Place the fingers of one hand on the center top and
bottom portion of the thermostat. Grasp the subbase
in the other hand on the top and bottom center, and
gentlypullstraightout(seefig.2). Thethermostathas
pin and socket connectors. Forcing or prying on the
thermostat will cause damage to the unit.
TABLE 1. TERMINAL REFERENCE
NEW THERMOSTAT
TERMINAL
OLD THERMOSTAT
TERMINAL
LABEL
NUMBER
DESIGNATION
FUNCTION
DESIGNATION
(1)
(2)
(3)
(4)
(5)
(6)
(7)
G
C
L
R
O
B
Fan Output
Transformer 24VAC Common
Malfunction Light
Transformer 24VAC Hot
Changeover Output (cool)
Changeover Output (hot)
Emergency Heat Relay (cycles on first
stage in emergency mode)
Emergency Heat Relay (continually
energized in emergency mode)
Stage 1 Cool
E1
(8)
E2
(9)
Y1
Y2
W1
W2
A1
(10)
(11)
(12)
(13)
Stage 2 Cool
Stage 1 Heat (compressor)
Stage 2 Heat (compressor)
Damper Motor
3
Expansion
plugs
2. Connect wires beneath terminal screws on sub-
base using appropriate wiring schematic (see figs.
3 through 6).
Connect wires under
terminal screws
3. Place subbase over hole in wall and mark mounting
hole locations on wall using subbase as a template.
S3
W1
E1
E2
L
S1S2
Mounting
hole
4. Move subbase out of the way. Drill mounting holes.
O
B
4-pin connector
Mounting
hole
Y1
Y2
C
5. Fasten subbase loosely to wall, as shown in fig. 3,
using two mounting screws. Place a level against
bottom of subbase, 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 subbase snugly, use plastic
expansion plugs to secure subbase.
R
G
W2
A1
9-pin connector
Pull wires through
this opening
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.
Figure 3. Subbase
WARNING
DO NOT EXCEED MAXIMUM VOLTAGE OR
CURRENT RATINGS. FIRE, PERSONAL IN-
JURY, AND/OR EQUIPMENT DAMAGE COULD
CAUTION
!
!
RESULT.
To prevent electrical shock and/or equipment
damage, disconnect electrical power at the main
fuse box until installation is complete. Verify
NOTE
power is off with a voltmeter.
The following wiring diagram shows typical terminal iden-
tification and wiring. For proper installation, refer to the
original manufacturers' instructions.
Malfunction
Light
Thermostat
Control
Circuit
THERMOSTAT
SYSTEM
O
B
Y1
Y2
G
E2
E1
W1
W2
A1
C
L
R
System
Monitor
Switch
Emergency
Relay
Constant
Output
Changeover
Energized
In Heat
Compressor
Contactor
Stage 2
Heat
Relay
Damper
Motor
Stage 1
Hot
120vAC
24vAC
Emergency
Relay
Switched
Output
Heat
Relay
Changeover
Energized
In Cool
Compressor
Contactor
Stage 1
Fan
Neutral
Relay
TRANSFORMER
Stage 2
Figure 4. Typical wiring diagram for single transformer systems
4
NOTE
IF SAFETY CIRCUITS ARE IN ONLY ONE OF THE
SYSTEMS, REMOVE THE TRANSFORMER OF THE
SYSTEM WITH NO SAFETY CIRCUITS.
Malfunction
Light
Thermostat
Control
Circuit
THERMOSTAT
SYSTEM
O
B
Y1
Y2
G
A1
W1
E1
E2
W2
C
L
R
Emergency
Relay
Constant
Output
Changeover
Energized
In Heat
Compressor
Contactor
Stage 2
System
Monitor
Switch
Limit or
Safety
Damper
Motor
CUT AND
TAPE OFF!
Switches
Hot
Emergency
Relay
Switched
Output
Heat
Relay
Changeover
Energized
In Cool
Compressor
Contactor
Stage 1
Limit or
Safety
Heat
Relay
120vAC
24vAC
Fan
TRANSFORMER
Hot
Relay
Neutral
TRANSFORMER
Stage 2
Switches
Stage 1
120vAC
Neutral
24vAC
HEAT PUMP SYSTEM
AUXILIARY HEATING SYSTEM
DEPENDING ON SYSTEM
REQUIREMENTS, REPLACE
WITH A 75VA TRANS-
TWO COMMONS MUST
BE JUMPERED TOGETHER!
FORMER, IF NEEDED
Figure 5. Typical wiring diagram for two-transformer system with NO safety circuits
NOTE
CAUTION
!
Relaycontactsshownarethermostaticallyoperated. The
accessory relay scheme is required when safety circuits
exist in both systems.
Polarity must be observed. If the HOT side of the
secondtransformerisjumperedtotheCOMMON
side of the first transformer, a short will be made.
Damage to equipment will occur when power is
restored.
Malfunction
Light
Thermostat
Control
Circuit
THERMOSTAT
SYSTEM
O
B
Y1
Y2
G
A1
W1
E1
E2
W2
C
L
R
Limit or
Safety
Limit or
Safety
Emergency
Relay
Constant
Output
System
Monitor
Switch
Changeover
Energized
In Heat
Compressor
Contactor
Stage 2
Damper
Motor
Hot
Switches
Switches
24vAC
120vAC
Neutral
Emergency
Relay
Switched
Output
Heat
Relay
Changeover
Energized
In Cool
Compressor
Contactor
Stage 1
AUXILIARY
HEATING
TRANSFORMER
Heat
Relay
24vAC
Fan
Accessory
Relay N.O.
Contact
Relay
Stage 2
Stage 1
Limit or
Safety
Limit or
HEAT PUMP SYSTEM
AUXILIARY HEATING SYSTEM
Safety
Hot
Switches
Switches
24vAC
TWO COMMONS MUST
BE JUMPERED TOGETHER!
120vAC
Neutral
HEAT PUMP
TRANSFORMER
Figure 6. Typical wiring diagram for two-transformer system with safety circuits in BOTH systems
5
tors and the plastic snaps lock into place (see fig. 7). Be
gentle when attaching thermostat. If the thermostat
does not seem to be attaching to the subbase easily,
make sure that the connector pins and plastic snaps are
properly aligned, and that excess wire is pushed into the
wall. Damage to the thermostat may occur if force is
used.
ATTACH THERMOSTAT TO SUBBASE
WERECOMMENDTHATYOUSETOPTIONSWITCHES
TO DESIRED POSITION BEFORE ATTACHING ON
SUBBASE (see OPERATION). WE ALSO RECOM-
MEND THAT YOU PROGRAM THE THERMOSTAT
WITH BATTERY INSTALLED BEFORE ATTACHING
ON SUBBASE (see OPERATION GUIDE for program-
ming instructions).
POWER TO THERMOSTAT MUST BE OFF BEFORE
ATTACHING THERMOSTAT TO WALL. FAILURE TO
TURN OFF POWER BEFORE ATTACHING THERMO-
STAT MAY CAUSE EQUIPMENT DAMAGE DUE TO
RAPID COMPRESSOR CYCLING.
To attach thermostat to subbase, line up the plastic snap
guides at the top of the thermostat and the 4 connector
pins on the thermostat with the connectors near the top
right section of the subbase (when viewed from the front).
Gently pivot the thermostat down until the 9-pin connec-
ENGAGE TWO UPPER GUIDES;
PIVOT DOWN
Figure 7. Attaching thermostat to subbase
OPERATION
4-pin connector
Battery
SYSTEM CONFIGURATION
SET OPTION SWITCHES
1. Single Stage Compressor Heat Pump System —
with reversing valve energized through B or O termi-
nals
Option
diode
(CR5)
W1
ON
Y1
Field jumper W1 & Y1
Switch #1 OFF
Switch #2 (see step 3)
Switch #3 (see step 4)
Switch #4 (see step 5)
Option switches
9-pin connector
1
2
3
4
Figure 8. Back of thermostat
2. Two Compressor (Split) or Two Speed Compres-
sor System
5. Total Keypad Lockout (Enabled)
W1
W2
Y1
Y2
Field jumper W1 & Y1
Field jumper W2 & Y2
NOTE
Option switches #1, #2, and #3 should be changed (if
required), programming should be completed, and bat-
teryshouldbeinstalledbeforechangingoptionswitch#4.
ON
Switch #1 ON
Switch #2 (see step 3)
Switch #3 (see step 4)
Switch #4 (see step 5)
1
2
3
4
ON
Switch #1 (see steps 1 & 2)
3. Economizer Enabled for 1st Stage Cooling — use
with fresh air damper to conserve energy by bringing
temperature down more slowly
Switch #2 (see step 3)
Switch #3 (see step 4)
1
2
3
4
Switch #4 ON
ON
Switch #1 (see steps 1 & 2)
Switch #2 ON
REVERSING VALVE DELAY OPTION
Switch #3 (see step 4)
Switch #4 (see step 5)
1
2
3
4
The diode designated as CR5 controls whether or not
there will be a delay in reversing valve switching (see fig.
8). With the diode installed and operational, there is no
delay. If the diode is not operational or is disconnected,
therewillbeasix-seconddelaybeforethereversingvalve
is switched.
4. Energy Management Recovery Option (Enabled)
ON
Switch #1 (see steps 1 & 2)
Switch #2 (see step 3)
Switch #3 ON
1
2
3
4
Switch #4 (see step 5)
6
EMERGENCY MODE OPERATION
CHECK THERMOSTAT OPERATION
SYSTEM
SWITCH
FAN OPERATION
1. Press
until EMER is displayed. The red
EMER LED should be lit continuously (non-flashing),
regardless of system cycling.
1. Turn on power to the system. If the auxiliary heat
source has a standing pilot, be sure to light it.
2. Press
to adjust thermostat about 5°F above
room temperature. Any systems (such as electric
strip heaters, fossil fuel systems, etc.) that are wired
or jumpered to the emergency circuit (thermostat
terminal E1) should begin to cycle.
FAN
SWITCH
2. Press
untilFANONisdisplayed. Theblower
should begin to operate.
FAN
SWITCH
3. Press
until FAN AUTO is displayed. The
blower should stop operating within approximately
one minute.
After the system has been checked and is running prop-
erly, determine if automatic changeover is desired (see
SYSTEM CONFIGURATION).
HEATING SYSTEM
Refer to the OPERATION GUIDE if you need additional
information on thermostat operation.
SYSTEM
SWITCH
1. Press
until HEAT is displayed (it may al-
ready be displayed).
2. Press toadjustthermostatto99°F. Allstagesof
TROUBLESHOOTING
the heating system should begin to operate within
approximately five minutes. However, if the PUMP
LED is flashing, the compressor lockout feature is
operating (see Lockout Bypass Option to tempo-
rarily override the compressor lockout feature during
testing).
Refer to the Question & Answer section of the OPERA-
TION GUIDE for information on troubleshooting the ther-
mostat.
LOCKOUT BYPASS OPTION
COOLING SYSTEM
FOR QUALIFIED SERVICE TECHNICIANS’ USE
ONLY. OPERATORS SHOULD NOT USE THIS
FEATURE DUE TO POSSIBILITY OF EQUIPMENT
ORPROPERTYDAMAGE,ORPERSONALINJURY.
CAUTION
!
Topreventcompressorand/orpropertydamage,
if power to the compressor has been off or
interrupted for more than 1 hour and the outdoor
temperature is below 50°F, DO NOT operate the
system for at least the amount of time the com-
pressor was off! This will allow the compressor
heaters to warm the compressor oils to avoid
damage due to slugging.
COMPRESSOR SHORT TERM
CYCLE PROTECTION
This thermostat has a built-in short term (5-minute)
time delay. During this 5-minute period, the thermo-
stat will lock out the compressor to allow head pres-
sure to stabilize. If you want to override this feature
VIEW
SYSTEM
SWITCH
1. Press
2. Press
until COOL is displayed.
while testing thermostat operation, simply press
PRGM
toadjustthermostatto40°F. Allstagesof
VIEW
TEMP
and
buttons at the same time at initial startup.
the cooling system should begin to operate within
approximately five minutes. However, if the PUMP
LED is flashing, the compressor lockout feature is
operating (see Lockout Bypass Option to tempo-
rarily override the compressor lockout feature during
testing).
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.
7
If you need further information about this product, please write to
White-Rodgers Division, Emerson Electric Co.
9797 Reavis Road
St. Louis, MO 63123-5398
Attention: Technical Service Department
WARRANTY INFORMATION
THISWARRANTYSTATEMENTSUPERSEDESALLWARRANTY
STATEMENTS DATED PRIOR TO OCTOBER 1, 1991.
This warranty extends only to persons or organizations who
purchase the Products for resale. THE FOREGOING CONSTI-
TUTES SELLER’S SOLE RESPONSIBILITY UNDER THIS WAR-
RANTY, AND PURCHASER’S EXCLUSIVE REMEDY FOR THE
BREACH THEREOF. EXCEPT AS OTHERWISE EXPRESSLY
SET FORTH IN THIS AGREEMENT, THERE ARE NO OTHER
WARRANTIES, EXPRESS OR IMPLIED, WHETHER OF MER-
CHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
OTHERWISE. SELLER SHALL NOT BE LIABLE FOR ANY SPE-
CIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAM-
AGES OF ANY CHARACTER IN CONNECTION WITH THE
SALE, RESALE OR USE OF THE PRODUCTS.
White-Rodgers Division of Emerson Electric Co. (“Seller”) war-
rants that its products purchased for resale (the “Products”) will be
free from defects in material and workmanship under normal use
and service for a period of twelve (12) months from date of
installation.Seller’sobligationunderthiswarranty,andPurchaser’s
exclusive remedy for the breach thereof, shall be limited to, at
Seller’s option, Seller’s replacement of any defective Product
F.O.B. Seller’s factory (excluding the cost of labor and any other
expenses incurred in servicing the unit on which the Product is
installed), or Seller’s issuance of a credit in the amount of the
purchase price of such Product for resale as described below.
Seller shall have the option of requiring the return of any defective
Product, transportation charges prepaid, before recognizing any
claim. This warranty shall not apply to any Product (1) which has
been repaired or altered outside Seller’s factory by other than
Seller in any manner so as, in Seller’s judgment, to affect its
serviceability or proper operation; (2) which has been subjected by
persons other than Seller to improper handling, operation, mainte-
nance, repair or alteration; or (3) which has been subjected to
misuse, negligence, or accident.
Complete warranty information and instructions for replacing/
returning warranty products can be found in the White-Rodgers
Product Catalog, or by telephoning or writing to:
White-Rodgers Division
Emerson Electric Co.
9797 Reavis Road
St. Louis, Missouri 63123-5398
(314) 577-1300
WARRANTY INFORMATION FOR CONSUMERS
When you purchase a White-Rodgers Division product, it is typi-
cally for replacement of a device which has failed on existing
residential or commercial equipment, or a component of new
equipment purchased for modernization.
While our warranty does not extend to you, your contractor or
dealer is protected by a one-year product warranty from White-
Rodgers. Your supplier can rely on a nearby White-Rodgers
wholesaler for prompt credit or replacement.
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