Sears 387.910100 User manual

owners
manual
a
■
MODEL NO.
387.910100
●Installation
●Operation AUTOMATIC
SET-BACK/SET-UP
THRIF-T THERMOSTAT
CAUTION:
Read all Instructions
Carefully Before
Starting the
Installation
F o r t h e r m o s t a t t o o p e r a t e p r o p e r l y,
YOU MUST:
■W I R E I T C O R R E C T L Y .
Put tabs on wires See Page 4, Note 7
■ADJUST HEAT ANTICIPATOR.
See Page 3&Page 6, Para. 1
STOP
Save This Manual For
Future Reference.
SEARS, ROEBUCK AND CO., Chicago, IL 60684 U.S.A.
Printed in U.S.A.

CONTENTS
6
Starting the Timer
Setting the Timer
Setting Thermostat to Desired
Temperature Level
Fan Switch
Calibrating Thermometer —
Replacing the Battery
REPAIR PARTS
INTRODUCTION
Features
INSTALLATION —Replacing Existing
Thermostat
Removing Old Thermostat
Installing New Subbase
Wiring the Subbase
Mounting Timer Assembly on Subbase
Setting Heat Anticipator
2
6
3
7
4
7
4
8
4
8
5
8
5
6
S E A R S T H E R M O S T A T
MODEL 387.910100
HEATING ONLY OR
HEATING/COOLING APPLICATION
INTRODUCTION
P l e a s e r e a d i n s t r u c t i o n s c o m p l e t e l y b e f o r e
installing and using your new thermostat. This will
help you make aperfect installation and obtain the
full value from this thermostat. If you prefer to have
your thermostat professionally installed, contact
your Sears Sales person to arrange for prompt,
quality installation by aSears Authorized Installer.
Y o u r n e w T h r i f - T t h e r m o s t a t :
1. Combines temperature control and aquartz timer
t o a u t o m a t i c a l l y l o w e r a n d r a i s e r o o m
temperature to set points for one, two or three
periods every 24 hours.
2. Has an adjustable heat anticipator to provide
greater room comfort.
Heating Anticipator: Adjustable from .15 to 1.0
amps.
Cooling Anticipator: Fixed for 0to 1.5 amps 30 V
max.
3. Has atimer that runs on areplaceable battery,
(Sears “AA” Die Hard Alkaline battery)
24 Volt AC 60 Hz. (30V Max.)
Current; Heating .15 Amps to 1.0 Amps
Cooling 0to 1.0 Amps
This thermostat can only be used on 24 volt A. C.
two-wire Heating-Only systems and 24 volt A. C.
four-wire or five-wire Heating-Cooling systems.
WARNING: Do not use on circuits exceeding 30
volts. Higher voltage will damage control -could
c a u s e s h o c k o r fi re hazard.
T h i s t h e r m o s t a t c a n n o t b e u s e d o n :
■Millivolt systems (self-generating systems that do
n o t h a v e a t r a n s f o r m e r o r r e l a y ) .
■Three-wire zone valve systems.
■Heat pump systems.
■Two-stage heat or cool systems.
■T h o s e E L E C T R I C H E AT I N G s y s t e m s w h e r e
B l o w e r c o m e s o n “ I M M E D I A T E L Y ” w h e n
thermostat calls for heat. (Fan is energized by
separate FAN RELAY)
S E A R S I N S T A L L A T I O N P O L I C Y SAFETY RULES
All installation labor arranged by Sears shall be
p e r f o r m e d i n a n e a t , w o r k m a n l i k e m a n n e r i n
a c c o r d a n c e w i t h g e n e r a l l y a c c e p t e d t r a d e
practices. Further, all installations shall comply with
all local laws, codes, regulations, and ordinances.
The customer shall also be protected, during
inst a ll at io n, b y in su ra nc e re la ti ng t o Pr o perty
Damage, Workmen’s Compensation and Public
Liability.
1. This thermostat is aprecision instrument. Handle
it accordingly. Do not twist, scratch or bend
either bi-metal coil as this would damage the
instrument.
2. Disconnect electrical power for furnace at main
fuse box before beginning installation.
3. Do not connect this thermostat directly to any
115-volt, or other line voltage systems.
4. Make sure all wiring agrees with local and
electrical codes and ordinances.
S E A R S I N S T A L L A T I O N W A R R A N T Y
In addition to any warranty extended to you on the
S e a r s m e r c h a n d i s e i n v o l v e d , w h i c h w a r r a n t y
b e c o m e s e f f e c t i v e t h e d a t e t h e m e r c h a n d i s e i s
installed, should the workmanship of any Sears
arranged installation prove faulty within one year.
Sears will, upon notice from you, cause such faults
to be corrected at no additional cost to you.
B A S I C T O O L S Y O U M A Y N E E D
Replacing Existing Thermostat
Hand Drill
Screwdriver
2

Let’s Get Acquainted .. FIG.
Remove the cover from your thermostat. Grasp
thermostat in one hand and pull it away from the
base. Gently press your finger tips into the slot
between the cover and base to snap off the cover.
(Fig. 1) Read all data on cardboard protector.
Carefully remove cardboard protector and foam
packings (Fig. 2). Discard these items.
FEATURES (Fig. 3)
1 . T h e r m o m e t e r o n f r o n t c o v e r o f t h e r m o s t a t .
2. Replaceable battery —Runs timer so that no
additional transformer, wiring, or other parts are
needed when replacing an existing 24 volt
heating, or heating-cooling thermostat.
3. Special subbase —Allows use on heating only, or
combination heat-cool systems.
4 . 2 4 - H o u r Q u a r t z T i m e r
CARDBOARD
FIG. F O A M P A C K I N G S
PROTECTOR
5 . R e m o v a b l e T i m e r S e l e c t o r s Two RED
selectors for “set-up” times, two BLUE selectors
for “set-back” time. Times can be easily changed
by removing selectors and re-installing them at
the desired times. (See figure 17.) Two additional
sel ector s are sto red ins ide the t hermo stat co ver,
in case you want an additional set-up/set-back
period.
6. A d ju s tab l e H eat A nti c ipa tor — A dju s te d f or
individual situations. See “Setting Heat
Anticipator” page 6.
7. Independent Temperature Levers —Lever with
red line in cove r s l o t f o r h i g h t e m p e r a t u r e
settings. Lever with blue line in cover slot for low
temperature settings.
8. Switch Pins
applications. (Provided in parts envelope along
with Jumper Wire, and 2mounting screws).
■|p
L e t ’ s G e t S t a r t e d . .
The instructions are presented in two parts:
1.) Instructions for replacing an existing thermostat,
(page 4)
2.) Instructions for setting and using the timer and
thermostat (pages 6and 7).
This thermostat is very easy to install. Follow these
instructions carefully. No additional wiring is
required when replacing an existing thermostat.
F o r u s e o n h e a t i n g o n l y
WARNING: USE THIS SUB¬
B A S E W I T H M O D E L 3 8 7 . 9 1 0 1 0 0
THERMOSTAT ONLY. IF USED WITH
ANY OTHER THERMOSTAT,
C O N T I N U O U S O P E R A T I O N O F
H E A T I N G S Y S T E M M A Y O C C U R .
W A R N I N G : o n l y u s e t h e r m o ¬
s t a t O N S U B B A S E P R O V I D E D O R
WITH WEEKEND ADAPTER SUB¬
B A S E M O D E L N O . 3 8 7 . 9 1 4 0 0 0 .
IF USED WITH ANY OTHER SUB¬
B A S E , C O N T I N U O U S O P E R AT I O N
O F H E A T I N G S Y S T E M M A Y O C C U R .
'^WARNING: usethis^
S U B - B A S E W I T H M O D E L
387.910100 THERMOSTAT
ONLY. IF USED WITH ANY
OTHER THERMOSTAT.
C O N T I N U O U S O P E R A T I O N
O F H E A T I N G S Y S T E M M A Y
OCCUR.
SUBBASt
TMFR ASSEMBLY
COVER

I N S TA L L AT I O N I N S T R U C T I O N S F O R
REPLACING AN EXISTING THERMOSTAT
NOTE: Your new thermostat will replace most
two-wire heating, 4-wire, 5-wire heating-cooling
thermostats. For exceptions, see page 2.
REMOVING OLD THERMOSTAT
1. Shut off electricity to furnace and air conditioner.
Leave it off until installation is complete.
2. Remove front cover of old thermostat (it will be a
“snap-on” type or one that is held in place with
screws.) (Fig. 4&5.)
anticipator setting on your old
, thermostat and write it down. This information
will be used to set the anticipator on your new
^thermostat. (Fig. 6). See page 6to set.
" 4. If your old thermostat has awall mounting plate,
remove the thermostat by unscrewing it. (Fig. 7).
If wiring is direct to thermostat, go to next step.
5A. FOR HEATING-ONLY:
D i s c o n n e c t t w o w i r e s a n d r e m o v e o l d
thermostat. Install the new subbase (Fig. 10) by
following the directions under “For Heating
Only —Installing Subbase” (Page 5).
5B. FOR HEATING/COOLING:
Identify wire terminal markings on old
thermostat as installed. Using chart in Figure 8,
find these markings. Reading across to the
right, find “type” of thermostat you have. For
example: old thermostat has terminals Rg, 4, Yg,
and G. Read across to the right; you’ll see you
have atype 4thermostat.
NOTE: Your old thermostat may have terminals
mark ed B , O, a nd X . If Wire s ar e co nn ected t o B
an d/o r O , th e Th rif - T cann ot be u s ed .
^USE WIRE LABELS to identify each wire before
removing from old thermostat.
Just 1. After finding type thermostat (5B above and
Fig 9) USE SELF-ADHESIVE WIRING
mmuie LABELS to identify each wire. Discard
o t h e r s w h i c h a r e n o t u s e d .
2. Disconnect the wiresoneata time. Attach to
each wire, the label that matches that wire’s
terminal marking on old thermostat. Do this
before you disconnectthe next wire. (Notice
the label had both the old terminal marking
and the new thermostat marking.) Leave
t h e s e l a b e l s a t t a c h e d t o t h e w i r e s .
3. Remove ol d mounting plate from wal l.
Follow directions under “For Heating/Cool¬
ing-Installing Subbase” (Page 5).
FIG. 4 COVER RING
I
WALL MOUNTING THERMOSTAT
PLATE
FIG. 5
r-
A D J U S TA B L E A N T I C I PA T O R
LOCATION ON SOME
THERMOSTATS
SWITCHING
SUBBASE
THERMOSTAT
COVER
INDICATOR
ANOTHER TYPICAL ANTICIPATOR
OFTEN SEEN ON OTHER
THERMOSTATS
A N T I C I P A T O R A S S E E N
O N S E A R S A N D O T H E R
THERMOSTATS
FIG. 9
TYPE
1NEW OLD
YY
NEW OLD
GG
NEW OLD
WW
NEW OLD
RC RC
NEW OLD
RH 4
TYPE
2HEW OLD
RC RC
NEW OLD
YY
NEW OLD
GG
NEW OLD
ww
NEW OLD
RH RH
II OLD
FIG. 7 FIG. 8 OLD THERMOSTAT
TERMINAL IDENTIFICATION V
THERMOSTAT
TYPE
TYPE
TYPE
GRC Y4 W
CAP T I V E SCR E W S 13NEW OLD
YC
NEW OLD
GF
NEW OLD
WH
>IEW OLD
RC V
NEW OLD
RH M
TYPE
RH WRC Y G c
2
TYPE
TYPE
4
V c F NEW OLD
GG
M H NEW OLD
W4
NEW OLD
YY6
NEW OLD
RH R5
3
TYPE
G
R5 4Y6 4TYPE
TYPE 5
C A P T I V E S C R E W NEW OLD
ww
NEW OLD NEW OLD
YYGG
NEW OLD
RH R
GW YR 5
//●
l
4
O'

W I R I N G T H E S U B B A S E
CAUTION: All wiring must comply with local and
national electrical codes and ordinances.
ALL SYSTEMS
1. Plug any hole in wall (around wiring) with afire¬
proof material to prevent drafts from affecting
thermostat operation.
2. After connnecting subbase, push excess wire
into wall (or electric box)
FOR HEATING ONLY —
INSTALLING SUBBASE
CAUTION: Be sure switch pins have been installed
as shown in (Fig. 10).
If this thermostat is to be used for heating only,
before mounting subbase to wall, insert switch pins
(in parts envelope) through the back of the subbase
as shown in figure 10. Put any household tape over
pins to hold in place. When installing the switch pins.
System Switch Lever should be in “OFF” position
and Fan Switch Lever should be in “AUTO” position.
The pins prevent the System switch from being
mo v ed t o “ COO L ” and t he Fa n s wit c h to t h e “ON ”
position.
1. Pull wires through opening near the center of
switching subbase.
2. Place subbase (Fig. 10) against wall where old
t h e r m o s t a t w a s l o c a t e d .
3. Fasten subbase with two mounting screws
provided, in level position. Place level across top
of plate, recheck and relevel if necessary.
4 . A t t a c h t h e t w o w i r e s t h a t w e r e c o n n e c t e d t o t h e
thermostat you removed, to terminals “W” and
“ R H ” o n t h e s u b b a s e .
5. Mount thermostat to subbase, and tighten captive
screws. All captive screws should be tightened
since they are electrical connections to the
heating system. (See Figure 13).
FIG. 10
MOUNTING HOLES
SWITCH PINS
SWITCHING
SUBBASE
FRONT VIEW REAR VIEW
NEW
2-WIRE
THERMOSTAT
FIG. 11
OLD
0^ 3-W IRE SERIES 10
PRIMARY CONTROL
JUMPER
FIG. 12
SUBBASE
RED JUMPER
OPENING
FOR WIRES
(6) RED CAPTIVE SCREWS
FIG. 13
TIMER ASSEMBLY
FO R U S E WIT H 3 - WIR E S E RIE S 1 0 S YST E MS
To use new Sears thermostat to replace thermostat
on Series lOthree-wire Heating System, Jumper R&
Bon primary control and wire as per (Fig. 11).
RED C A P T IVE S C R E WS
SUBBASE
FOR HEATING/COOLING -
INSTALLING SUBBASE
U s e e i t h e r A o r B , a s i t a p p l i e s t o y o u r s y s t e m ,
heating/cooling application.
(6) RED CAPTIVE SCREWS
MOUNTING SCREWS
MOUNT TIMER ASSEMBLY
ON SUBBASE
1, Use six red captive screws already in place (Fig.
A F I V E - W I R E S Y S T E M w h e r e ( 2 )
separate transformers are used on heating
system and cooling system. 13).
1. Connect labeled wires to corresponding
terminal screws (Fig. 12). Do not use red
jumper wire (discard).
CAUTION: Make sure all red captive screws are
tightened snugly. They are electrical connectors
between timer assembly and subbase. (Fig. 13).
F O U R - W I R E S Y S T E MB
1 . C o n n e c t l a b e l e d w i r e s t o t h e i r r e s p e c t i v e
terminal screws (Fig. 12).
2. Connect the red jumper wire (in parts
envelope) between “RC” and
terminals on the subbase (Fig. 12).
RH”
5

SET HEAT ANTICIPATOR
This thermostat has an Adjustable Heat Anticipator.
(Fig. 14). Set the “Amp Pointer” to match the current
draw (amperage rating) of furnace control to which
t h e t h e r m o s t a t i s w i r e d .
For closer room temperature regulation, adjust
anticipator. To have alonger heating “ON” time,
m o v e a m p p o i n t e r t o h i g h e r s e t t i n g ( c o u n t e r
clockwise
To have ashorter heating “ON” time, move amp
pointer to lower setting (clockwise
amp pointer not more than half the distance between
the number on which the anticipator is now set and
the next number. Additional adjustments may be
made if required.
S T A R T T H E T I M E R
The timer is powered with Sears “AA” Die Hard
alkaline battery.
The battery is in place in your new thermostat (Fig.
15). For shipment acardboard strip (Fig. 15) has
been inserted between the left contact and end of
ba tt e ry. T HI S C AR D BO AR D S TR I P MU ST B E
R E M O V E D T O S T A R T T H E T I M E R .
1. Raise tab straight away from the battery.
2. Hold one finger on battery to keep it in place.
3. Gently pull tab straight out.
NOTE: If timer does not start, remove battery and
re-insert it.
SET THE TIMER (FIG. 16 &17)
The timer has been pre-set to lowerthe temperature
at 11:00 p.m. and raise it at 6:00 a.m. for the first
period. The second period is set to lower the
temperature at 10:00 a.m. and raise it at 4:00 p.m.
Other settings may be made by:
1. Holding timer dial securely, remove each RED
c o d e d t i m e r s e l e c t o r . R e - i n s t a l l t h e m a t t h e
desired time to start each HIGH (set-up)
temperature selection.
2. Holding timer dial securely, remove each BLUE
c o d e d t i m e r s e l e c t o r . R e - i n s t a l l t h e m a t t h e
desired time to start each LOW (set-back)
temperature selection.
3 . T w o a d d i t i o n a l s e t s o f s e l e c t o r s a r e i n s i d e t h e
cover. Use them if additional set-back, set-up
periods are desired. Atotal of three set-back,
set-up periods may be programmed each 24
hours.
Remember: Depending on local weather conditions
and the temperature you select, it may take several
h o u r s t o c o o l t o a d e s i r e d t e m p e r a t u r e .
4. During the air conditioning season you may wish
to maintain ahigher temperature during the day
and alower temperature at night. This may be
even more desirable if no one is at home during
the day. In this case, set the red time selector to
the AM time you want the house temperature to
rise to high temperature setting. Set the blue time
selector to the PM time you want the house
temperature to return to the Lo setting. (Fig. 18)
NOTE: Make sure you have located the Time
Selectors at the proper AM/PM positions on the
dial. This is a24-hour timer (clock).
USE T H I S L EV E R TO
ADJUST POINTER
HEAT ANTICIPATOR
FIG.14
I.
Ll>
^\\\
'.3
,25'
)■
AMP POINTER
(MOVE POINTER TO MATCH CURRENT
RATING OF PRIMARY CONTROL)
NOTE:
). Move
FIG. 15
it
BATTERY
CARDBOARD TAB
T I M E S E L E C T O R S E T T I N G S
FIG.16 BLUE RED
©
iLI
IV
\
0^1
FIG. 17
SNAP OFF / TIME SELECTOR time REFERENCE POST
TIMER DIAL
■O'
X
TIME
ELECTORS
SNAP ON
BOTTOM
OF TIMER
B O T T O M O F
THERMOSTAT
WOLD EDGE OF DIAL WHEN ADDINGAEMOVING SELECTORS.
FIG. 18 O P E R AT I N G W I T H A D O U B L E S E T - B A C K
6K)0 A.M. 4 K X ) P. M .
80° FRED
TEMP. LEVER rm
75° F. BLUE
TEMP. LEVER »
10J30 P.M. lOflO A . M . 104)0 P.M.
6

T I M E R E F E R E N C E M A R K
FIG. 19
5. To set timer to the correct time of day (after Time
Selectors are in place), turn dial at least one
complete counterclockwise revolution past the
correct time of day, then continue
counterclockwise rotation to the correct time.
(Fig. 19). Snap cover onto thermostat.
Tg-
/
T O O P E R A T E S Y S T E M
TURN ON ELECTRICAL POWER SUPPLY
SETTING THERMOSTAT TO DESIRED
T E M P E R A T U R E L E V E L
Move the Hi Temperature Setting Lever to the
highest temperature desired (Fig. 20). Move the Lo
Te m p e r a t u r e S e t t i n g L e v e r t o t h e l o w e s t
temperature desired. The difference between the
setting is the amount of set-back or set-up. If the red
and blue marks are together, no set-back or set-up
will take place.
14
FIG. 20
RED MARK
US E TH I S ED G E FO R
SETTING TEMPERATURE
SET FAN SWITCH
When used on combination heat-cool systems, the
Fan Switch should normally be set in the “AUTO”
position which will cause the fan to cycle with the
heating or cooling system. When the Switch is
mo v ed to the “ON ” p osition, t h e fan (furn a ce
blower) will run continuously to provide constant air
circulation.
*On heating only systems, the fan will operate only
when the furnace is heating.
S E T S Y S T E M S W I T C H
S e l e c t C O O L , O F F, o r H E AT
?□-
RED MARK
50 60 70
B L U E M A R K
B L U E M A R K
U S E O F FA N A N D S Y S T E M S W I T C H E S
This chart shows the different ways you can set the
Syste m a n d F a n S e l e c t o r s w i t c h e s — a n d t h e
results.
FAN SYSTEM
RESULTS
AUTO ON COOL OFF HEAT
|VW|
UVNo heating, no cooling, no fan
1/ vl: No heating, no cooling, but fan runs constantly
Cooling system turns on and off (controlled by the
thermostat). Fan runs constantly.
v: Cooling system and fan turn on and off (controlled by
the thermostat).
Heating system turns on and off (controlled by the
t h e r m o s t a t ) . F a n i s c o n t r o l l e d f r o m f a n c o n t r o l i n
furnace.*
v:
Lv: Heating system turns on and off (controlled by the
thermostat). Fan runs constantly.
* I f w i r e d f o r e l e c t r i c a l h e a t , f a n t u r n s O N a n d
OFF through heat relay in furnace.
ysr
7

CALIBRATING THERMOMETER
If thermometer reading on cover does not match
thermostat: (See Figure 21).
1 . R e m o v e c o v e r f r o m t h e r m o s t a t .
2. Set cover on table near an accurate thermometer.
3 . A l l o w a t l e a s t 1 0 m i n u t e s f o r t h e r m o m e t e r s t o
s e n s e r o o m t e m p e r a t u r e .
4. If the thermometer readings are the same, replace
thermostat cover.
5 . I f t h e t h e r m o s t a t c o v e r t h e r m o m e t e r d i f f e r s f r o m
t h e t h e r m o m e t e r o n t h e t a b l e , i n s e r t a s m a l l
s c r e w d r i v e r b l a d e i n t o t h e t h e r m o m e t e r s h a f t i n
the back of the cover. Adjust until the cover
t h e r m o m e t e r m a t c h e s t h e o t h e r t h e r m o m e t e r .
6. Replace cover.
FIG. 21
1
FIG. 22
/
)
R E P L A C I N G T H E B A T T E R Y
If the timer slows or stops, remove thermostat cover
and replace battery. Adead battery will cause loss of
set-back feature, it will not affect the function of the
system.
Pry battery out with asmall screwdriver. (Fig. 22)
Install new battery, with positive (+) end to the right.
Replacement batteries are available thru Sears
Parts Department in your nearest Sears Store.
After replacing battery, refer to “Start and Set
Timer”, page 6.
D
BATTERY
POSITIVE (+) END
\\
■\v
2i
Ui
REPAIR PARTS
S E A R S H E A T I N G / C O O L I N G
OR HEATING ONLY
THERMOSTAT MODEL 387.910100
Always Order by Part Number —not by Key Number
Part
Key
Description
No. No.
Cover
1.5 Volt “AA” Alkaline Battery
Thermostat
2 4 H o u r T i m e r
(with Time Selectors)
Adjustable Heat Anticipator
Subbase
Parts Envelope (containing
Switch Pins, Jumper Wire,
Mounting Screws)
Time Selectors (3 sets of 2)
Owners Manual (F642-12882)
FI 45-0861
STD. 366452
FI 45-0931
FI 45-0929
1
2
3
4
F67-0934
FI45-0930
FI 45-0880
5
6
7
8FI45-0864
37-3795-D
±
tNot Illustrated
W H E N O R D E R I N G R E P A I R P A R T S A L W A Y S G I V E
T H E F O L L O W I N G I N F O R M A T I O N :
1. PART NUMBER
2. PART DESCRIPTION
3. MODEL NUMBER
4 . N A M E O F I T E M
If the parts you need are not stocked locally, your
order will be electronically transmitted to aSears
Repair Parts Distribution center for handling.
MODEL 387.910100
The Model Number of your Heating/Cooling
Thermostat will be found on the Thermostat Timer.
How to Order Repair Parts
All parts listed herein may be ordered from any
SEARS, ROEBUCK AND CO. retail orcatalog store.
SEARS, ROEBUCK AND CO., Chicago, IL 60684 U.S.A.
Form No. F642-12882 (Rev. 7/86) 37-3795-D