White Rodgers 1F94-80 User manual

Printed in U.S.A.
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-
mostatstoresprogramsforsevenindependentdays.The
thermostat will store both heating and cooling programs
simultaneously. A 9 volt Energizer®battery will maintain
thestored programfor approximatelyone week,if incom-
ingpowershould fail. Ifpowerfailure is extensiveandthe
program is lost, after power restoration, the thermostat
willautomaticallymaintainafactorypreprogrammedheat-
ingtemperatureof64°Foracoolingtemperatureof82°F.
PART NO. 37-5185A
9329
PRECAUTIONS
Operator: Save these instructions for future use!
WHITE-RODGERS DIVISION
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
ST. LOUIS, MISSOURI 63123-5398
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY
BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE
PERSONAL INJURY AND/OR PROPERTY DAMAGE.
WHITE-RODGERS 1F94-80
Multi-stage Electronic Digital Thermostat
Ifindoubtaboutwhetheryourwiringismillivolt,line,orlow
voltage, have it inspected by a qualified heating and air
conditioning contractor, electrician, or someone familiar
with basic electricity and wiring.
Do not exceed the specification ratings.
DESCRIPTION
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 compo-
nents could cause the control to malfunction.
To prevent electrical shock and/or equipment
damage,disconnect electricpower tosystem,at
mainfuseorcircuitbreakerbox,untilinstallation
is complete.
Do not use on circuits exceeding specified volt-
age. Higher voltage will damage control and
could cause shock or fire hazard.
Do not short out terminals on gas valve or pri-
marycontroltotest. Shortorincorrectwiringwill
burn out thermostat and could cause personal
injury and/or property damage.
CAUTION
!
WARNING
!
R
CONTENTS
Description......................................................... 1
Precautions........................................................ 1
Specifications..................................................... 2
Installation.......................................................... 2
New Installation
Select Thermostat Location
Route Wires to Location
Replacement Installation
Remove Old Thermostat
Attach Subbase to Wall
Attach Thermostat to Subbase
Operation ........................................................... 5
System Configuration
Set Option Switches
Check Thermostat Operation
Fan Operation
Heating System
Cooling System
Troubleshooting
INSTALLATION INSTRUCTIONS

2
ELECTRICAL DATA
Electrical Rating:
20 to 30v AC 50/60 Hz.
0.01 to 1.5 Amps (Load per terminal)
2.5 Amps Maximum Total Load (All terminals
combined)
Anticipation:
Heating 4 to 40
Cooling 4 to 40 Reference Values
Auxiliary 4 to 40
STAGING DATA
Up to two heating stages
Up to two cooling stages
SPECIFICATIONS
INSTALLATION
THIS CONTROL IS DESIGNED FOR USE WHERE BOTH SIDES OF THE TRANSFORMER ARE PRESENT
TO THE THERMOSTAT (both the hot and common sides of the 24vAC end of the transformer.)
THERMAL DATA
Setpoint Temperature Range:
40°F to 99°F (4°C to 37°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
ACCESSORIES
Remote Sense Kit W. R. Part No. F145-1049
Thermostat Guard W. R. Part No. F29-0198 (clear) or
F29-0238 (opaque)
}
NEW INSTALLATION
YOU SHOULD PROGRAM THE THERMOSTAT WITH
BATTERY INSTALLED BEFORE ATTACHING ON
SUBBASE. SEEOPERATIONGUIDEFORPROGRAM-
MING INSTRUCTIONS.
SELECT THERMOSTAT LOCATION
Proper location insures that the thermostat will provide a
comfortable building temperature. Observe the following
general rules when selecting a location:
1. Locate thermostat about 5 ft. above the floor.
2. Install thermostat on a partitioning wall, not on an
outside wall.
3. Never expose thermostat to direct light from lamps,
sun, fireplaces or any temperature radiating equip-
ment.
4. Avoid locations close to windows, adjoining outside
walls, or doors that lead outside.
5. Avoid locations close to air registers or in the direct
path of air from them.
6. Makesure thereare nopipesorductworkinthatpart
of the wall chosen for the thermostat location.
7. Never locate thermostat in a room that normally
warmer or cooler than the rest of the building.
8. Avoid locations with poor air circulation, such as
behind doors or in alcoves.
ROUTE WIRES TO LOCATION
All wiring must conform with local and national electrical
codes and ordinances.
1. Probe for obstructions in partition before drilling 1/2"
hole in wall at selected location. Take up quarter
roundanddrillasmallguideholeforsighting(seefig.
1).Frombasement,drill3/4"holeinpartitionfloornext
to guide hole. In buildings without basements, drill 1/
2" hole through ceiling and into partition from above
(see fig. 1).
2. Through this hole drop a light chain, or 6" chain
attachedtoa strongcord. nagcord in basementwith
hooked wire. In buildings without basements, drop
cord through hole in ceiling and down partitioning;
snag cord at the thermostat location.
3. Attachthermostatwirestocordandpullwiresthrough
hole in wall so that 6" of wire protrudes.
Approximately
5 feet from floor
1/2" hole for
thermostat wire
Stout cord with 6"
chain attached
Baseboard
strip moulding
1/4" guide hole
for sighting
Quarter round
removed
3/4" hole in floor of partition
Hooked wire for snagging chain
Figure 1. Routing thermostat wires

3
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
wiresstill attached,removewallplatefromthewall.
3. If the old thermostat has a wall mounting plate,
removethethermostatandthewallmountingplateas
an assembly.
4. UsetheCrossReferenceGuidetofindthethermostat
type you are replacing.
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.
6. Disconnect the wires from old thermostat one at a
time.Pullatleast 6inches ofwireoutofthewall.DO
NOT LET WIRES FALL BACK INTO THE WALL.
7. Install new thermostat using the following proce-
dures.
ATTACH SUBBASE TO WALL
1. Remove the packing material from the thermostat.
Place the fingers of one hand on the center top and
bottomportion ofthethermostat. Grasp thesubbase
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.
PULL STRAIGHT OUT
Figure 2. Removing thermostat from subbase
TABLE 1. WIRE IDENTIFICATION LABELS
1
G
G
1
9
Y1
Y1
9
2
C
C
2
3
L
L
3
4
R
R
4
5
O
O
5
6
B
B
6
7
E1
E1
7
8
E2
E2
8
10
Y2
Y2
10
11
W1
W1
11
12
W2
W2
12
13
A1
A1
13
14
S1
S1
14
15
S2
S2
15
16
S3
S3
16
THISTHERMOSTATREQUIRES BOTHTHEHOTAND
COMMON SIDES OF THE 24vAC TRANSFORMER TO
BE PRESENT TO THE THERMOSTAT FOR OPERA-
TION.
NOTE
TABLE 1. TERMINAL REFERENCE
LABEL
NUMBER
NEW THERMOSTAT
TERMINAL
DESIGNATION FUNCTION
OLD THERMOSTAT
TERMINAL
DESIGNATION
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
G
C
L
R
O
B
E1
E2
Y1
Y2
W1
W2
A1
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
Stage 2 Cool
Stage 1 Heat (compressor)
Stage 2 Heat (compressor)
Damper Motor

4
2. Connect wires beneath terminal screws on sub-
base using appropriate wiring schematic (see figs.
3 through 6).
3. Place subbase over hole in wall and mark mounting
hole locations on wall using subbase as a template.
4. Move subbase out of the way. Drill mounting holes.
5. Fasten subbase loosely to wall, as shown in fig. 3,
using two mounting screws. Place a level against
bottomofsubbase,adjustuntillevel,andthentighten
screws. (Leveling is for appearance only and will not
affectthermostatoperation.) Ifyouareusingexisting
mountingholes,orifholesdrilledaretoolargeanddo
not allow you to tighten subbase snugly, use plastic
expansion plugs to secure subbase.
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.
S1S2 S3
Mounting
hole
Pull wires through
this opening
Connect wires under
terminal screws
Mounting
hole
4-pin connector
9-pin connector
O
B
Y1
Y2
C
G
W1
R
W2
Expansion
plugs
Figure 3. Subbase
E1
E2
L
A1
DO NOT EXCEED MAXIMUM VOLTAGE OR
CURRENT RATINGS. FIRE, PERSONAL IN-
JURY, AND/OR EQUIPMENT DAMAGE COULD
RESULT.
To prevent electrical shock and/or equipment
damage,disconnect electricalpower atthemain
fuse box until installation is complete. Verify
CAUTION
!
WARNING
!
NOTE
power is off with a voltmeter.
Thefollowingwiringdiagramshowstypicalterminaliden-
tification and wiring. For proper installation, refer to the
original manufacturers' instructions.
L
C R
B
O
Changeover
Energized
In Heat
Changeover
Energized
In Cool
Compressor
Contactor
Stage 1
Fan
Relay
Heat
Relay
Stage 1
Damper
Motor
Thermostat
Control
Circuit
Compressor
Contactor
Stage 2
24vAC 120vAC
Hot
Neutral
THERMOSTAT
SYSTEM
Y1 Y2 W1 A1
E1
Emergency
Relay
Constant
Output
E2
Emergency
Relay
Switched
Output TRANSFORMER
Malfunction
Light
System
Monitor
Switch
Figure 4. Typical wiring diagram for single transformer systems
G
Heat
Relay
Stage 2
W2

5
IF SAFETY CIRCUITS ARE IN ONLY ONE OF THE
SYSTEMS, REMOVE THE TRANSFORMER OF THE
SYSTEM WITH NO SAFETY CIRCUITS.
NOTE
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
sideofthefirsttransformer,ashortwillbemade.
Damage to equipment will occur when power is
restored.
NOTE
CAUTION
!
Limit or
Safety
Switches
Heat
Relay
Stage 1
Figure 5. Typical wiring diagram for two-transformer system with NO safety circuits
DEPENDING ON SYSTEM
REQUIREMENTS, REPLACE
WITH A 75VA TRANS-
FORMER, IF NEEDED
TWO COMMONS MUST
BE JUMPERED TOGETHER!
CUT AND
TAPE OFF!
CR
G
B
O
Changeover
Energized
In Heat
Changeover
Energized
In Cool
Thermostat
Control
Circuit
24vAC 120vAC
Hot
Neutral
THERMOSTAT
SYSTEM
Y1 Y2 W2E1 E2
TRANSFORMER
Malfunction
Light
System
Monitor
Switch
L
HEAT PUMP SYSTEM AUXILIARY HEATING SYSTEM
W1
Limit or
Safety
Switches
24vAC120vAC
Hot
Neutral
TRANSFORMER
Compressor
Contactor
Stage 1
Compressor
Contactor
Stage 2
Fan
Relay
Emergency
Relay
Switched
Output
Emergency
Relay
Constant
Output
Heat
Relay
Stage 2
A1
Damper
Motor
Limit or
Safety
Switches
Limit or
Safety
Switches
Limit or
Safety
Switches
Figure 6. Typical wiring diagram for two-transformer system with safety circuits in BOTH systems
TWO COMMONS MUST
BE JUMPERED TOGETHER!
C R
G
B
O
Changeover
Energized
In Heat
Changeover
Energized
In Cool
Compressor
Contactor
Stage 1
Fan
Relay
Heat
Relay
Stage 2
Compressor
Contactor
Stage 2
24vAC 120vAC
Hot
Neutral
THERMOSTAT
SYSTEM
Y1 Y2 W2E1
Emergency
Relay
Constant
Output
E2
Emergency
Relay
Switched
Output
HEAT PUMP
TRANSFORMER
Malfunction
Light
System
Monitor
Switch
HEAT PUMP SYSTEM AUXILIARY HEATING SYSTEM
W1
24vAC 120vAC
Hot
Neutral
AUXILIARY
HEATING
TRANSFORMER
Limit or
Safety
Switches
24vAC
Accessory
Relay N.O.
Contact
Thermostat
Control
Circuit
L
Heat
Relay
Stage 1
Damper
Motor
A1

6
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
rightsectionofthesubbase(whenviewedfromthefront).
Gently pivot the thermostat down until the 9-pin connec-
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.
OPERATION
ENGAGE TWO UPPER GUIDES;
PIVOT DOWN
Figure 7. Attaching thermostat to subbase
SYSTEM CONFIGURATION
SET OPTION SWITCHES
1. Single Stage Compressor Heat Pump System —
with reversing valve energized through Bor Otermi-
nals
2. Two Compressor (Split) or Two Speed Compres-
sor System
3. Economizer Enabled for 1st Stage Cooling —use
with fresh air damper to conserve energy by bringing
temperature down more slowly
4. Energy Management Recovery Option (Enabled)
5. Total Keypad Lockout (Enabled)
Option switches #1, #2, and #3 should be changed (if
required), programming should be completed, and bat-
teryshouldbeinstalledbeforechangingoptionswitch#4.
REVERSING VALVE DELAY OPTION
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.
Figure 8. Back of thermostat
Option switches 9-pin connector
4-pin connector Battery
Option
diode
(CR5)
ON
1234
Switch #1 OFF
Switch #2 (see step 3)
Switch #3 (see step 4)
Switch #4 (see step 5)
W1 Y1
Field jumper W1 & Y1
ON
1234
Switch #1 ON
Switch #2 (see step 3)
Switch #3 (see step 4)
Switch #4
(
see step 5
)
W1 Y1 Field jumper W1 & Y1
W2 Y2 Field jumper W2 & Y2
ON
1234
Switch #1 (see steps 1 & 2)
Switch #2 (see step 3)
Switch #3 ON
Switch #4
(
see step 5
)
ON
1234
Switch #1 (see steps 1 & 2)
Switch #2 ON
Switch #3 (see step 4)
Switch #4
(
see step 5
)
NOTE
ON
1234
Switch #1 (see steps 1 & 2)
Switch #2 (see step 3)
Switch #3 (see step 4)
Switch #4 ON

7
CHECK THERMOSTAT OPERATION
FAN OPERATION
1. Turn on power to the system. If the auxiliary heat
source has a standing pilot, be sure to light it.
2. Press
FAN
SWITCH untilFANONisdisplayed.Theblower
should begin to operate.
3. Press
FAN
SWITCH
until FAN AUTO is displayed. The
blower should stop operating within approximately
one minute.
HEATING SYSTEM
1. Press
SYSTEM
SWITCH until HEAT is displayed (it may al-
ready be displayed).
2. Press toadjustthermostatto99°F.Allstagesof
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).
COOLING SYSTEM
Topreventcompressorand/orpropertydamage,
if power to the compressor has been off or
interruptedfor morethan1hourand theoutdoor
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.
1. Press
SYSTEM
SWITCH
until COOL is displayed.
2. Press toadjustthermostatto40°F.Allstagesof
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).
EMERGENCY MODE OPERATION
1. Press
SYSTEM
SWITCH
until EMER is displayed. The red
EMERLEDshouldbe lit continuously (non-flashing),
regardless of system cycling.
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.
After the system has been checked and is running prop-
erly, determine if automatic changeover is desired (see
SYSTEM CONFIGURATION).
Refer to the OPERATION GUIDE if you need additional
information on thermostat operation.
TROUBLESHOOTING
Refer to the Question & Answer section of the OPERA-
TION GUIDE for information on troubleshooting the ther-
mostat.
CAUTION
!
LOCKOUT BYPASS OPTION
FOR QUALIFIED SERVICE TECHNICIANS’ USE
ONLY. OPERATORS SHOULD NOT USE THIS
FEATURE DUE TO POSSIBILITY OF EQUIPMENT
ORPROPERTYDAMAGE,ORPERSONALINJURY.
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
whiletestingthermostatoperation,simplypress
VIEW
PRGM
and
VIEW
TEMP
buttons at the same time at initial startup.
DO NOT USE THE LOCKOUT BYPASS OPTION
UNLESSTHECOMPRESSOROILHEATERSHAVE
BEEN OPERATIONAL FOR 6 HOURS AND THE
SYSTEMHAS NOTBEENOPERATIONAL FORAT
LEAST 5 MINUTES.

WARRANTY INFORMATION
THISWARRANTYSTATEMENTSUPERSEDESALLWARRANTY
STATEMENTS DATED PRIOR TO OCTOBER 1, 1991.
White-Rodgers Division of Emerson Electric Co. (“Seller”) war-
rantsthatits products purchased forresale(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
serviceabilityorproperoperation;(2)whichhasbeensubjectedby
personsother thanSeller toimproper handling,operation, mainte-
nance, repair or alteration; or (3) which has been subjected to
misuse, negligence, or accident.
This warranty extends only to persons or organizations who
purchase the Products for resale. THE FOREGOING CONSTI-
TUTESSELLER’SSOLE RESPONSIBILITYUNDERTHISWAR-
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,FITNESSFORAPARTICULARPURPOSE,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.
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
[phone]
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.
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