White Rodgers 1F90-71 User manual

PART NO. 37-5086B
Replaces 37-5086A
9517
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 heating
and cooling systems. The user may program up to four
time/temperature settings per 24 hour period. The ther-
mostatstoresindependentheatingandcoolingprograms
for 5-day (weekday) and 2-day (weekend) periods. The
thermostat will store both heating and cooling programs
simultaneously.Three“AA”Energizer®batterieswillmain-
tain the stored program for approximately one year, if
incoming power should fail. If power failure is extensive
and the program is lost, after power restoration, the
thermostat will automatically maintain a factory
preprogrammedheatingtemperatureof64°Foracooling
temperature of 82°F.
INSTALLATION INSTRUCTIONS
1F90-71
5-Day/2-Day Electronic Digital Thermostat
WHITE-RODGERS DIVISION
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
ST. LOUIS, MISSOURI 63123-5398 Printed in U.S.A.
PRECAUTIONS
R
WHITE-RODGERS
Operator: Save these insructions for future use!
Ifindoubtaboutwhetheryourwiringismillivolt,line,orlow
voltage, have it inspected by a qualified heating and air
conditioning contractor, electrician, or someone familiar
with basic electricity and wiring.
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 ........................................................... 6
System Configuration
A. Set Group A Option Switches
B. Set Group B Option Switches
C. Electric Heat Systems
Check Thermostat Operation
Fan Operation
Heating System
Cooling System
Troubleshooting
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 compo-
nents could cause the control to malfunction.
To prevent electrical shock and/or equipment
damage, disconnect electric power to system, at
mainfuse orcircuitbreaker box,until installation
is complete.
Do not use on circuits exceeding specified volt-
age. Higher voltage will damage the control and
could cause shock or fire hazard.
Donotshortoutterminalsongasvalveorprimary
control to test. Short or incorrect wiring will burn
out thermostat and could cause personal injury
and/or property damage.
CAUTION
!
WARNING
!

2
SPECIFICATIONS
ELECTRICAL DATA
Electrical Rating:
17 to 30 VAC, 50/60 Hz.
0.05 to 1.5 Amps
1.5 Amps Maximum Total Load (All terminals
combined)
Anticipation:
Heating 2 to 40
Cooling 4 to 40
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
APPLICATIONS
For use with:
• Standard heat/cool or heat-only systems
• Three-wire zone valve systems
• Millivolt systems
• Electric heat systems
• Gas or oil fired systems
• Gas systems with intermittent ignition devices
(I.I.D.) and/or vent dampers
Do not use with:
• Multi-stage systems
• Heat pump systems
• Systems exceeding 30 VAC and 1.5 Amps
ACCESSORIES
Remote Sense Kit W. R. Part No. F145-1049
Thermostat Guard W. R. Part No. F29-0198 (clear)
or F29-0238 (opaque)
}Reference Values
INSTALLATION
NEW INSTALLATION
You should program the thermostat with batteries
installed before attaching on subbase. See OPERA-
TION GUIDE for programming 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 therearenopipesorductwork inthatpart
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. Probeforobstructionsinpartitionbeforedrilling1⁄2”
hole in wall at selected location. Take up quarter
round and drill a small guide hole for sighting (see
fig. 1). From basement, drill 3⁄4” hole in partition
floor next to guide hole. In buildings without base-
ments, drill 1⁄2” hole through ceiling and into parti-
tion from above.
2. Through this hole drop a light chain, or 6” chain
attachedtoastrongcord.Snagcordinbasementwith
hooked wire. In buildings without basements, drop
cord through hole in ceiling and down partitioning;
snag cord at the thermostat location.
3. Attach thermostat wire to cord and pull wire through
hole in wall so that 6” of wire protrudes.
NOTE
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. FOR HEATING ONLY SYSTEMS — Disconnect the
two wires from the old thermostat. Skip steps 5
through7belowandproceedtoATTACHSUBBASE
TO WALL.
5. FOR HEATING/COOLING SYSTEMS — Before re-
moving wires from old thermostat, identify the termi-
nals that have wires attached on the old thermostat.
ThenuseTable1toidentifythetypeofthermostatyou
are replacing. For example, if the old thermostat has
wires attached to terminals R, W, Y, and G, the old
thermostat is a type 5 (note that the old thermostat
may not have wires attached to all the terminals
identified in Table 1).
6. Use the self-adhesive labels enclosed with your
new thermostat to identify the wires attached to
the old thermostat. The labels correspond to the
thermostattypenumberyouidentifiedinstep5above
(seeTable2).Forexample,ifyoudeterminedthatthe
old thermostat is a type 5, use the labels for the type
5 thermostat (you may not use all the labels for the
typenumberyou’veidentifiediftheoldthermostatdid
not have wires attached to all the terminals).
7. Labeleachwireasyoudisconnectit.Thelabelshave
both the old terminal markings and the new terminal
identification. Discard any unused labels. PULL AT
LEAST SIX INCHES OF WIRE OUT OF THE WALL
WHEN YOU DISCONNECT IT - DO NOT ALLOW
THE WIRES TO FALL BACK INTO THE WALL.
ATTACH SUBBASE TO WALL
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.
2. Pull wires through opening in the center of the sub-
base. DO NOT LET WIRES FALL BACK INTO
WALL.
3. Connect wires beneath terminal screws on sub-
base using appropriate wiring schematic (see figs.
3 through 11).
(Installation instructions continue on page 5.)
TABLE 1. OLD THERMOSTAT IDENTIFICATION
Type
1
Type
2
Type
3
Type
4
Type
5
4
RH
M
R5
R
W
W
H
4
W
RC
RC
V
Y
Y
C
Y6
Y
G
G
F
G
G
OLD
THERMOSTAT
TYPE
OLD THERMOSTAT
TERMINAL IDENTIFICATION
TABLE 2. WIRE IDENTIFICATION LABELS
Type
1
Type
2
Type
3
Type
4
Type
5
New Old
RH 4
New Old
RH RH
New Old
RH M
New Old
RH R5
New Old
RH R
New Old
W W
New Old
W W
New Old
W H
New Old
W 4
New Old
W W
New Old
RC RC
New Old
RC RC
New Old
RC V
New Old
Y Y
New Old
Y Y
New Old
Y C
New Old
Y Y6
New Old
Y Y
New Old
G G
New Old
G G
New Old
G F
New Old
G G
New Old
G G
PULL STRAIGHT OUT
Figure 2. Removing thermostat from subbase
G
RC
Mounting
hole
Pull wires through
this opening
Connect wires under
terminal screws
Mounting
hole
6-pin connector
3-pin connector
6
MV
Y
W
Screw
anchors
Figure 3. Subbase
Activity
light
RH

4
RH
Y
MV
24 VAC 120 VAC
Hot
Neutral
THERMOSTAT
SYSTEM
G W
Figure 7. Typical wiring diagram for heat/cool, 4-wire, single transformer systems
TRANSFORMER
6
Cooling
System Fan
Relay Heating System
RC
JUMPER
WIRE
G
RC
6
MV
Y
W
RH
Thermostat Terminal Connections
G
From 24 VAC
transformer
From fan relay
From cooling system
Y
CONNECT red jumper
wire (provided)
W
RH
From heating system
NOTE
RED jumper wire (pro-
vided with thermostat)
must be connected be-
tween thermostat's RH
and RC terminals for pro-
per thermostat operation
with this system.
RC
Y
MV
24 VAC 120 VAC
Hot
Neutral
THERMOSTAT
SYSTEM
G W
Figure 6. Typical wiring diagram for cool only, 3-wire, single transformer systems
6
Fan
Relay
Cooling
System
RH
TRANSFORMER
G
RC
6
MV
Y
W
RH
Thermostat Terminal Connections
G
From 24 VAC
transformer
From fan relay
From cooling system
RC
Y
RH
Y
MV
24 VAC 120 VAC
Hot
Neutral
THERMOSTAT
SYSTEM
G W
Figure 5. Typical wiring diagram for heat only, 3-wire, single transformer systems
TRANSFORMER
6 RC
Fan
Relay Heating
System
JUMPER
WIRE
G
RC
6
MV
Y
W
RH
W
RH
Thermostat Terminal Connections
G
From heating system
From 24 VAC
transformer
From fan relay
CONNECT red jumper
wire (provided)
NOTE
RED jumper wire (pro-
vided with thermostat)
must be connected be-
tween thermostat's RH
and RC terminals for pro-
per thermostat operation
with this system.
CAUTION
!
All wiring diagrams are for typical systems only. Refer to
equipment manufacturers’ instructions for specific sys-
tem wiring information.
To prevent electrical shock and/or equipment
damage, disconnect electrical power at the main
fuse box or circuit breaker until installation is
complete.
NOTE
RH
Y
MV
24 VAC 120 VAC
Hot
Neutral
THERMOSTAT
SYSTEM
G W
Figure 4. Typical wiring diagram for heat only, 2-wire, single transformer systems
TRANSFORMER
6
Heating
System
RC
G
RC
6
MV
Y
W
RH
W
RH
Thermostat Terminal Connections
From heating system
From 24 VAC transformer

5
RH
Y
MV
24 VAC 120 VAC
Hot
Neutral
THERMOSTAT
SYSTEM
G W
HEATING TRANSFORMER
6
24 VAC 120 VAC
Hot
Neutral
COOLING TRANSFORMER
Cooling
System Fan Relay Heating System
RC
G
RC
6
MV
Y
W
RH
Thermostat Terminal Connections
From fan relay
From heating
system
From 24 VAC
cooling transformer
From cooling
system
From 24 VAC
heating transformer
Figure 11. Typical wiring diagram for heat/cool, 5-wire, two-transformer system
RH
W
RC
G
Y
RH
Y
MV
24 VAC 120 VAC
Hot
Neutral
THERMOSTAT
SYSTEM
G W
Figure 10. Typical wiring diagram for heat only, 3-wire, zone valve systems
TRANSFORMER
6
Zone
Valve
64 5
21
RC
G
RC
6
MV
Y
W
RH
Thermostat Terminal Connections
From 24 VAC transformer
(through zone valve)
W
From zone valve
RH
6
RH
Y
MV
THERMOSTAT
SYSTEM
G W
Figure 9. Typical wiring diagram for millivolt systems + cool only, 3-wire systems
6
Millivolt
System
RC
G
RC
6
MV
Y
W
RH
Thermostat Terminal Connections
From fan relay
W
From millivolt system
MV
Cooling
System Fan Relay
24 VAC 120 VAC
Hot
Neutral
TRANSFORMER
RC
G
Y
From cooling system
From 24 VAC
transformer
4. Place subbase over hole in wall and mark mounting
hole locations on wall using subbase as a template.
5. Move subbase out of the way. Drill mounting holes.
6. 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
screw anchors to secure subbase.
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.
RH
Y
MV
THERMOSTAT
SYSTEM
G W
Figure 8. Typical wiring diagram for millivolt systems
6
Millivolt
System
RC
G
RC
6
MV
Y
W
RH
Thermostat Terminal Connections
From millivolt system
W
From millivolt system
MV

6
Figure 13. Back of thermostat
Option switches 3-pin connector
6-pin connector Batteries
W14 W22
(Group A)
(Group B)
ATTACH THERMOSTAT TO SUBBASE
IT IS RECOMMENDED THAT YOU SET OPTION
SWITCHESTODESIREDPOSITIONBEFOREATTACH-
ING ON SUBBASE (see OPERATION). IT IS ALSO
RECOMMENDED THAT YOU PROGRAM THE
THERMOSTAT WITH BATTERIES INSTALLED BE-
FORE ATTACHING ON SUBBASE (see OPERATION
GUIDE for programming instructions).
USE
SYSTEM
SWITCH
TO TURN THERMOSTAT OFF BE-
FORE ATTACHING THERMOSTAT TO WALL.
FAILURE TO TURN THERMOSTAT OFF BEFORE
ATTACHINGTO WALL MAYCAUSE EQUIPMENT
DAMAGE DUE TO RAPID COMPRESSOR CY-
CLING.
To attach thermostat to subbase, line up the plastic snap
guides at the bottom of the thermostat and the three
connector pins on the thermostat with the connectors
nearthebottom left sectionofthesubbase (when viewed
fromthe front).Gentlypivotthethermostatupuntilthesix
pin connectors and the plastic snaps lock into place (see
fig. 12). Be gentle when attaching thermostat. If the
thermostatdoesnotseemtobeattachingto 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.
CAUTION
!
OPERATION
SYSTEM CONFIGURATION
A. SET GROUP A OPTION SWITCHES
DO NOT REMOVE THE “AA” BATTERIES WHEN
CHANGING GROUP A OPTION SWITCHES. Any
time Group B option switches are changed, the bat-
teriesmustberemovedforaminimumoftwominutes.
1. Total Keypad Activity
2. TotalKeypad Lockout— Allthermostatbuttonsare
disabled.
3. Limited Temperature Range — Temperature may
beraisedorloweredwithinprogrammedtemperature
limits (temperature adjustment cannot exceed the
lowest cooling or highest heating program tempera-
tures).
When thermostat is in Limited Temperature Range
only the following buttons are disabled:
ADV
PRGM HOLD TEMP SET
DAY
NOTE
ON
12
Switch #1 OFF
Switch #2 OFF
ON
12
Switch #1 ON
Switch #2 OFF
ON
12
Switch #1 OFF
Switch #2 ON
B. SET GROUP B OPTION SWITCHES
ANY TIME GROUP B OPTION SWITCHES ARE
CHANGED,THE“AA”BATTERIESMUSTBEREMOVED
FOR A MINIMUM OF 2 MINUTES. DO NOT REMOVE
THE BATTERIES WHEN CHANGING GROUP A OP-
TION SWITCHES.
1. AutomaticChangeover(Heating/CoolingSystems
Only) — enables thermostat to automatically switch
between heating and cooling programs to maintain
desired room temperature.
ENGAGE TWO LOWER GUIDES;
PIVOT UP
Figure 12. Attaching thermostat to subbase
NOTE
ON
123
Switch #1 ON
Switch #2 OFF
Switch #3 (see step B5)

7
ON
123
Switch #1 OFF
Switch #2 OFF
Switch #3 (see step B5)
2. Manual Changeover (Heating/Cooling Systems
Only)
3. Heat Only Systems
4. Cool Only Systems
5. Computed Energy Management Recovery
(EMR) — With EMR enabled, system will be ener-
gized before the next program period begins, to
achieve programmed temperature by the beginning
of the next program period (the thermostat’s micro-
computer calculates 15 minutes for every 2°F tem-
perature change). For example, assume that the
thermostat is programmed to provide an overnight
heating temperature of 62°F, and during the next
programperiod,programmedtobeginat6:00AM,the
programmed temperature is 70°F. With EMR acti-
vated, the thermostat will automatically activate the
heating system at 5:00 AM, so that the programmed
temperature of 70°F is reached by about 6:00 AM.
C. ELECTRIC HEAT SYSTEMS
For central electric heat systems where the blower is
energized by a separate circuit through the fan relay
(meaning that the fan turns on immediately on call for
heat),clipwireW14onthebackofthethermostat(seefig.
13).Ifthethermostatisenergizing electric heat sequenc-
ers, DO NOT clip wire W14.
CHECK THERMOSTAT OPERATION
When checking thermostat, Group B option switches #1
and #2 for automatic changeover must be in the OFF
position.Thiswillallowtemporarysettingofheatsetpoints
abovecoolsetpoints.Aftersystemcheckout,resetGroup
Boptionswitch#1toONpositionifautomaticchangeover
is desired (see SET GROUP B OPTION SWITCHES).
FAN OPERATION
1. Turn on power to the system. If the heat source has
a standing pilot, be sure to light it.
2. Press
FAN
SWITCH
untilFAN ONisdisplayed.Theblower
should begin to operate (this will work only on sys-
tems with a Gterminal).
Onthree-wireheatonlysystems,oronfour-wireheat/
cool systems, if the thermostat display is operating
properly, but the fan does not operate when
FAN
SWITCH
ispressed,theredjumperwire(providedwiththermo-
stat) may not be properly installed between the RH
and RC terminals. Disconnect electrical power to
system and properly install the jumper wire per the
appropriate wiring diagram.
3. Press
FAN
SWITCH
until FAN AUTO is displayed. The
blower should stop operating within approximately
one minute.
HEATING SYSTEM
1. Press
SYSTEM
SWITCH
untilHEATisdisplayed(itmayalready
be displayed).
2. Press to adjust thermostat above room tem-
perature to call for heat. The heating system should
begin to operate.
(Instructions continue on next page.)
LOCKOUT BYPASS OPTION
FOR QUALIFIED SERVICE TECHNICIANS’ USE
ONLY.OPERATORSSHOULDNOTUSETHISFEA-
TURE DUE TO POSSIBILITY OF EQUIPMENT OR
PROPERTY DAMAGE, OR PERSONAL INJURY.
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
while testing thermostat operation, simply press
ADV
PRGM
and
HOLD
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.
ON
123
Switch #1 OFF
Switch #2 ON
Switch #3 (see step B5)
ON
123
Switch #1 ON
Switch #2 ON
Switch #3 (see step B5)
ON
123
Switch #1 (see steps B1–B4)
Switch #2 (see steps B1–B4)
Switch #3 OFF
NOTE

COOLING SYSTEM
To prevent compressor and/or property damage,
if power to the compressor has been off or inter-
rupted 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.
1. Press
SYSTEM
SWITCH
until COOL is displayed.
2. Press to adjust thermostat below room tem-
perature to call for cool. The blower should come on
immediately, followed by cold air circulation. How-
ever, if the blower does not come on and the word
COOL is flashing, the compressor lockout feature is
operating (see Lockout Bypass Option to tempo-
rarily override the compressor lockout feature during
testing).
Ifthethermostatdisplayisoperatingproperly,butthe
cooling system does not operate when the above
steps are performed, the red jumper wire (provided
with thermostat) may not be properly installed be-
tween the RH and RC terminals. Disconnect electri-
cal power to system and properly install the jumper
wire per the appropriate wiring diagram.
CAUTION
!
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.
If you need further information about this product, please write to:
WHITE-RODGERS
Division of Emerson Electric Co.
9797 Reavis Road
St. Louis, MO 63123-5398
ATTN: Technical Service Department