Sears 8MPN075B12B1 Furnace User Manual


 
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WARNING: ELECTRICAL SHOCK HAZARD It'
CONNECTION DIAGRAM DISCONNECTBEFORESERVICING LADDER DIAGRAM zoo _.
m _OO
ROLLOUTSWITCH+TO2 > +40 0
TO 115VAC FIELD DISCONNECT
INSERIESDEPENDING LPPRESSURE . . COPPERCONDUCTORS C) rr
ONMODEL MAINLIMIT BVSS SWTCH CAPACITOR ONLY J[ HOT NOTE #2 */_7 EQUIPMENT GROUND Oo O
_i R __R 2 (WHEN USED) (WHEN USED) (SOME MODELS' 1_ i_ NEUTRAL 0 + Z qlZ
--R R-- -@ HOT END .,ERLOC.' O=O.
--o -- -_ ,EUTRALI L SWITCH ' _U3_ Pml_l _
f_._ °. / I--£g%RESSURESW,TCHY _ GNTER " I+" I ,,OUCER N 211o. II,DU_ER%I_.ICAPACITOR a_" o_
I ,,V,'1%I_°L'_I I Y +TO2mSEnmS /INDUCERG_RNMI'irin "1 Iv I RELAY P2 I I'" I MOTOR1 ITI(sON1EMODELs) 3: 03003
\ ..... /IMVI'_GRNA''I--P 'l DEPENDINGONMODEL_ MOTOR j_ JlIU[ BK I == _ETI2 II,.I k. / IOI . _ rn_ Z
........... _ - o , +,__:_ _ ._ _ o_,
PS NOITIEI3II I --W_SE"SOR "_¢ ' ' 'Z I I'I_',T_°Ntl NOTE#13 r_2.
--@:: 4-q, l II I_ 1 + _]GNITER II
--- W TE#13 _ I_
[ 24vAcL_coMIII "_ / B. W/_I _I]Hu_ "1*_4_-_ " ++o
- BK LO (R) I -- -
I RED ,LUE II I .s, _..--. . i /'1" - '+'11 HEAT/COOL M2_I_ I-- *]I
I . II I NDIF:'.-' ' 2 I _ ' JUNCTION RELAY-- HEAT_IMHI(O/_ ._I _1
.....'%... II I "_ LBK,_I'_I ;_ _, _ox I _ -" / "k"---J_?_ +, 0
III, _ MLO BL _ -< 60SEC
x 3: _ -0 MI PSC >
_ _ BLOWER #,
W BLOWER
I_=_'_ O__ III L,_. i B. T I RELAY I" _'X _ N
I_ _ _ II I _ _g I B._ I _E_C _ _ I .
= °'_ ] I-_ rNI + _ BR _11 CONT FAN N + _ rM__-_ C
I _[-_-r _ ___ _L_ . / q r_ w _ I 'II ' - (OPT) _ I _>_
1.1_ +++,,_+_,,,. FtfFll+~-B.=. _ _-+_ I ,.SER,ESDE'_E.°,.+ TR_R C
k _'_ .... H_OL + _ I _--_ONMODEL_ PI_FUSESA_";" L (
W _ _ I _ MA_LIMIT II NOT[_ _4VA_ _O_ _ _
-- --R -- -- __ ...... P14 1TO21NSERIES ' m_l_Q1
w I_ ____N _ER/E_DEL _ _ _ 1.
1. Ifanyoftheoriginalequipmentwireisreplacedusewirerated 105°C. SPEEDTAP CODE COLOR CODE - - .... -I -< - -
HUM 24VAC 140SEC
2. Useonlycopperwirebetweenfl]edisconnectswitchandthefumace .... --L-- P1 10
- I.unctJonbox BLAC K BK i LP PRESS SWITCH
_.. . •.... BLAC. ., BLOE BL II , I .=;L:_I/' _[+'_;DELSONL'D'
3. to furnace sheet metal for control to
..is wire mus, _e connec,e_ w . _ I
., ORANGE MHI BROWN BR _ I P+8 NOTE#8
provename. BLUE MLO GREEN/YELLOWGRN/YII '_=_ \ _ ......
4. Symbols are electrical representation only. I \ L_
ORANGE O GAS L ........ I
5. Solid lines inside circuit board are printed circuJt board traces and are RED LO RED R VALVE P1 2 _ I O J1
not depicted as shown in the legend.
WHITE W y CPU RELAY BV_ -- ' mm 100 18
6. Replaceonlywitha5ampfuse. YELLOW Y I I _._ __) (FIELDINSTALLED) E_ IBBI
7. Slower motor speed selec(Jons are for average conditions, see _ m J
installation instructions for detail .... pti........ peed selection. . ' ' J I _ I r 0 140
8. Factory connected when LP Pressure Switch and BVSS (Chimney -- LOW VOLTAGE FACTORY _ -- I P1;7 _--_ 80 SEC
Adapter A....... yKit) ...... tinstal!ed. ' vAGASE )_
..... ' +"-IT
9. Blower ofFdelay, gas heating selec_ons are (60, i00, 140, and 180) LOW VOLTAGE FIELD
seconds, cooling or heat pump 90 seconds. _ z r__ p
LINE VOLTAGE FACTORY oS- = // ** NOTE #3
10. Ignition lockout will occur after four consecutive unsuccessful trials for LINE VOLTAGE F IELD
ignition. Controlwillauto-reset after three hours. __ _ _ _ | ,I_)P1 3 SENSOR
CONDUCTOR ON CONTROL
11. Blower motor and inducer motor contain internal auto-reset thermal -- _o_ ,1_) P1 1 NOTE#12
overload switch es. J U NC TIO N
O UNMARKED TERMINAL I _" I.
12. Flame sensor: 0.7 RA D.C. minimum, 2.0 - 4.0 pA nominal. _ IICONTROL BOARD I_,P1 9
13. Depending on model, P4 inducer motor leads may be in a single connector
or b,_._oquick connecters. CONTR OL TE R MI NAL 330709-101REV,B
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