LENNOX Controls And HVAC Accessories Manual L0806303

User Manual: LENNOX LENNOX Controls and HVAC Accessories Manual LENNOX Controls and HVAC Accessories Owner's Manual, LENNOX Controls and HVAC Accessories installation guides

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,1,_1998 Lennox Industries Inc.
Dallas, Texas
KITS COMMON TO HEATING
AND COOLING EQUIPMENT
502,818M
11/98 LOW AMBIENT CONTROL KIT
Supersedes 3/96
INSTALLATION INSTRUCTIONS FOR LOW AMBIENT CONTROL KIT LB-57113BM (27J00)
USED WITH SINGLE-COMPRESSOR HEAT PUMP UNITS
Package 1 of 1 contains:
1- Low ambient pressure switch assembly (Sll)
1- 36" (914 mm) length of 1/4" (6,35 mm) copper tube
with flare nuts
1- Relay
1- 20-Foot length of wire
4- 20" Lengths of wire
1- Bag assembly each containing:
8-Wire nuts
2-Saddle valves
4-#10-16 X 5/8" S,D,S,T. screws
1-Schrader depressor tee with seal cap
The low ambient pressure switch (Sll) cycles the
outdoor fan while allowing compressor operation in the
cooling cycle. This intermittent fan operation results in
a high evaporating temperature which allows the
system to operate without icing the evaporator coil and
losing capacity. This kit is designed for use in ambient
temperatures no lower than 30°F.
Lennox recommends a belly-band style crankcase heater
(P-8-8852, 240v, 45w) be added to compressors which
do not have one. A freezestat (LB-62858CA) should also
be added to any system using a low ambient kit.
NOTE -Do not use this low ambient kit on units with
capillary tube metering devices. Install an expansion
valve metering device if using this kit.
A-Pressure Switch Assembly
1- Disconnect power to unit.
2- Remove compressor compartment access panel,
3- Install valve depressor tee discharge line gauge port.
4- Install pressure switch in compressor compartment
with screws provided. Switch should be installed in a
vertical position higher than mid-point of compressor.
See figure 1.
TYPICAL INSTALLATION
Sll LOW AMBIENT
PRESSURE SWITCH
COMPRESSOR
SHOCK HIGH
LOOP PRESSURE
SWITCH
DISCHARGE
LINE
S24 LOSS
OF CHARGE
SWITCH
VALVE
DEPRESSOR
TEE
5-
FIGURE 1
Connect copper line to low ambient pressure
switch and open side of depressor tee (provided).
Provide a shock loop in copper tubing to prevent
breakage from vibration, Tighten connections,
Depressor tee port with valve core is used as
service port, If necessary, valve core can be moved
to other leg of tee,
Page 1
B-Low Ambient Pressure Switch Setting (S11)
One of two types of pressure switches are provided, The
Ranco switch has one square and one round adjustment
knob and the AIco switch has two square adjustment
knobs,
Ranco Model
The low ambient pressure switch provided in the kit is
factory set for 285 psig (1965 kPa) cut-in and 140 psig
(965 kPa) cut-out,
If necessary, adjust low ambient pressure switch as
follows:
1-Rotate round knob to set cut-in pressure, Refer to right
set of indicating numbers on face of control, See
figure 3,
2- Rotate square knob to set differential indicator to 145
psig (999 kPa), Refer to left set of indicating numbers,
Alco Model
If necessary, adjust low ambient pressure switch as
follows:
1-Rotate the square knob located on the left to set cut-in
pressure, Refer to left set of indicating numbers on
face of control, See figure 2,
2- Rotate the square knob located on the right to set
differential indicator to 145 psig (999 kPa), Refer to
right set of indicating numbers,
3- Use only terminals 1 and 4 when connecting wiring,
NOTE -Disregard "Cut out minus Diff. is Cut In"
statement on face of control. This does not apply in this
appfication.
C-Low Ambient Relay (K58)
1- Install low ambient relay in control box,
LOW AMBIENT PRESSURE SWITCH Sll DETAIL
RANCO MODEL
SQUARE DIFFERENTIAL
ADJUSTMENT KNOB
\
ROUND CUT-IN
ADJUSTMENT
KNOB
DIFFERENTIAL
PRESSURE READ-
OUT ON LEFT
CUT-IN PRESSURE
READOUT ON
RIGHT
PRESSURE SWITCH IS FACTORY-SET AT 285 PSIG CUT-IN
AND 145 PSlG DIFFERENTIAL (140 PSlG CUT-OUT)
ALCO MODEL
ROUND CUT-IN
ADJUSTMENT
KNOB
\
SQUARE DIFFERENTIAL
ADJUSTMENT KNOB
CUT-IN PRESSURE
READOUT ON LEFT DIFFERENTIAL
PRESSURE READ-
OUT ON RIGHT
FIGURE 2
Page 2
Lowambientpressureswitch$11iswiredinserieswith
outdoorfanrelayorcompressorcontactor(single-stage
orspeedunits),
Lowambientkitsareshownwithoptionalarrowsonunit
wiringdiagrams,Ifunitwiringdiagramisnotavailableor
doesnotshowthelowambientkit,referto appropriate
wiring diagramin figures 3 through13 for wiring
connections,
TO "R" LOW
VO LT
TERM STRIP
K4
DEFROST
RELAY
TO "0" LOW
VOLT TERM
STRIP
Sll LOW AMBIENT CONTROL SWITCHES
OUTDOOR FAN DIRECTLY (LINE VOLTAGE)
i_= _r"= i
TO K1-1
K31 PIN 5
COMP "C"
L1
REVERSING
VALVE
!
REMOVE THIS WIRE
$11
LOW AMBIENT
PRESSURE
SWITCH
D
K58 LOW
AMBIENT
IRELAY
11 31
? '
• I
TO 24V COM
FAN MOTOR ]
TO C12
TERMINAL F
REMOVE THIS
,_......."d/VIRE
TO C12 TERM C
TO K1-1
FIELD WIRING
FACTORY WIRING
SEE SCHEMATIC FIGURE 4
FIGURE 3
Page 3
TYPICAL SINGLE-COMPRESSOR HEAT PUMP UNIT WIRING DIAGRAM
($11 LOW AMBIENT CONTROL SWITCHES OUTDOOR FAN DIRECTLY)
cc
W
<
L
_o
_o
o
<
C
R(LI LI
MP(N L2
HB (FOR G21V)
DS (FOR G21V,B,CB,CBH21)
ECON __ __ __
Wl
W2
DESCRIPTION
KEY COMPONENT
A4 CONTROL-TIMED OFF
BI COMPRESSOR
B4 MOTOR-OUTDOOR FAN
Cl CAPACITOR-OUTDOOR FAN
C5 CAPACITOR=COMPRESSOR
C7 CAPACITOR-COMPRESSOR START
C]2 CAPACITOR=DUAL
CMC] CONTROL-DEFROST
HRI HEATER-COMPRESSOR
KI,-I CONTACTOR-COMPRESSOR
KA,-I,_,3 RELAY-DEFROST
K26,-I RELAY-EMERGENCY HEAT
KSE RELAY-HARD START
K58,-I RELAY-LOW AMB. KIT
LJ VALVE-REVERSING
RTS SENSOR-AMBIENT COMPENSATION
54 LIMIT=HIGH PRESSURE SWITCH
$5 LIMIT-HIGH TEMPERATURE
$6 SWITCH,DEFROST
GEl SWITCH=PRESSURE,LOW AMB. KIT
$23 THERMOSTAT-LO AMB. CUT IN
524 SWITCH=LOSS OF CHARGE
$54 THERMOSTAT-SERVICE LIGHT
TBI& TERMINAL STRIP-LOW VOLTAGE
_55€ & RT3 USED WITH
GE OR HONEYWELL THERMOSTAT
A
G(SL)
GROUND
24V POWER
[_ TBI4
HB
K4-3 _FACTORY WIRE,REMOVE WHEN
TIMED OFF CONTROL (A4) IS USED.
$54 HOOKUP WITH WHITE-RODGERS OR
Z_HEATCRAFT ELECTRONIC THERMOSTAT
$6
i
)
DS
ECON
E
G
Wl
Tw2
w
Y2
g
YI u
2
$54
LE TERt
DESIGNATION VOLTAGE
P 208=250/60/E
T 220-240/50/E
DENOTES OPTIONAL COMPONENTS
LINE VOLTAGE FIELD INSTALLED
CLASS II VOLTAGE FIELD WIRING
Z_FOR USE WITH COPPER
CONDUCTORS ONLY,
REFER TO UNIT RATING
PLATE FOR MINIMUM
CIRCUIT AMPACITY
AND MAXIMUM FUSE 51ZE
z:_USED ONLY IF COMPRESSOR
FHERMOSTAT 15 NOT INTERNAL
Z_ "T" VOLTAGE UNITS ONLY
COMMON
C7
E
I.ENNDX, o,o._,..,oo. WIRING DIAGRAM_//_
HEAT PUMP-OUTDOORUNITS
HEAT PUMP SECTION-B
SEE PICTORIAL FIGURE 3
FIGURE 4
Page 4
$11 LOW AMBIENT PRESSURE CONTROL SWITCHES OUTDOOR
FAN(S) THROUGH A RELAY OR CONTACTOR (PILOT CIRCUIT)
HP17-953, 1353 TWO-SPEED FIELD WIRING
FACTORY WIRING
24 V POWER K45
REVERSING
VALVE RELAY
$11
LOW AMBIENT
PRESSURE SWITCH
TO K70-1 PIN 4
K4
DEFROST
RELAY
I
I
1 2 31
==_r= == I
I"" '_-_-] -I
l
TO 24V COM
VELR1SING
I Iw_w K'° l
CONDENSER FAN
CONTACTOR
SEE SCHEMATIC FIGURE 6
REMOVE THIS WIRE
K58 LOW
AMBIENT
RELAY
4
__
---1--_'7 I
TO 2!V COM
FIGURE 5
Page 5
TYPICAL SINGLE-COMPRESSOR HEAT PUMP UNIT WIRING DIAGRAM
($11 LOW AMBIENT CONTROL SWITCHES OUTDOOR FAN THROUGH A RELAY OR CONTACTOR (PILOT CIRCUIT)
TBI4
A
)K45 I
2 POLE CONTACTOR USED
L_ON -y* VOLTAGE ONLY
ECON
[]
[]
)t_ _ DESCRIPTION
K8 I Z_X KEY COMPONENT
_MED OFF
................
SPII 61 IOMPRESSOR
B4 _OTOR CONTROL FAN
B5 IO_OR CONTROL FAN
Cl ;APABITOR GONOENSER FAN
CZ ;APAC[_OR CONDENSER FAN
_ _ FI USE TRANSFORMER TI
_ HRI 1EATER COMPRESSOR
KI, I,Z _DN3ACTOR COMPRESSOR
Sp KZ. 1.2 :ONTAETOR COMPRESSOR
K4 I,Z,3 _ELAY DEFROST
KZ_ R7 KIO, I ONTACTOR CONDENSER FAN
) K24 1 IELAY CONTROL.SOLENOIO VALVE
] K¢5, 1,2 _ELAY REVERSING VALVE
KBG, 1,2 _ELAY STA_E I,COOL
2*V K57, I 4_LA'f 51AGE 2,L:OOL
[]
K70, I _ELAY STAGE I,CONTROL
FIELD PROVIDED OPTION USEO K71 IT5 _ELA_ STAGE Z CONTROL
z_ FOR _ STAGE CODLING ONLY. K79, !,P _ELAY LVAV,SPII IOPTIONALI
24VAC,SVA MAX, NEC/CEC CLASS 2 LI /ALVE REVERSING
[Jo /ALVE SDLENOIO,2 STAGE STAGE
SOLENOID VALVE IS FIELD R7 1FSI£T[OR CIJRRFNT £FN£1NC_ [OPT/
PROVIDED OPTION USED FOR R?[_ IESISTOR CURRENT SENSING [OPT)
z STAGE COOLING ONLY. R4 5_ITCH LIMIT. HI PRESSURE
_ _ITCH DEFROST. COMPRE550R
SII 3_[TCH LOW AMB KIT
LINE VOLTAGE FACTORY INSTALLED 524 _iV[_CH LOSS OF CHARGE
LINE VOLTAGE FIELD INSTALLED _4g IV/ITCH DEFROST TERMINATION
19 CONTROL
_[514 ]LOCK TERMINAL ILO_ VOLTAGE)
SECTION B
SEE PICTORIAL FIGURE 5
FIGURE 6
Page 6
TYPICAL SINGLE-COMPRESSOR PACKAGED HEAT PUMP UNIT WIRING DIAGRAM
($11 LOW AMBIENT CONTROL SWITCHES OUTDOOR FAN DIRECTLY)
CHP16-2 TO 5 TON UNITS
IZ =31
KlO-I-_Z=-t-
CONDENSER[ -- v-- I
FAN RELAY
_OO
>
04
o
l-
i
---4
P35
J35 I 1
II
II , , K58LOW
II /1 3 I AMBIENT RELAY
--1_4, _'ICOMPRESSOR1
I
1
\
REMOVE THIS WIRE
/N1
c°_RTpS°_
LOW
AMBIENT
PRESSURE
SWITCH
COMP1
B4
_CA OUTDOOR
FAN MOTOR 1
pACcIlToR
SEE SCHEMATIC FIGURE 9
------ FIELD WIRING
FACTORY WIRING
FIGURE 7
TYPICAL SINGLE-COMPRESSOR LOW AMBIENT WIRING FOR UNITS CONTAINING
68J29 AND 68J84 DEFROST BOARDS (CMC1)
K58 LOW
AMBIENT RELAY
3/
"=
,--_ _ _1----I
\\ .... !
CMC1
DEFROST CONTROL
R
__ LOW
L_ AMBIENT
PRES-
SURE
SWITCH
REMOVE THIS WIRE
/
K1
COMPRESSOR
CONTACTOR
j. 22
FIELD WIRING
FACTORY WIRING
FIGURE 8
Page 7
TYPICAL SINGLE-COMPRESSOR PACKAGED HEAT PUMP UNIT WIRING DIAGRAM
P2
/-6 b
"x,
-I
<
($11 LOW AMBIENT CONTROL SWITCHES OUTDOOR FAN DIRECTLY)
KA-I
CHP16-2 TO 5 TON UNITS
TBE
2AV POWER [_)
NOTE-IF ANY WIRE IN THIS APPLIANCE IS REPLACED, IT
MUST BE REPLACED WITH WIRE OF LIKE SIZE, RATING
AND INSULATION THICKNESS.
DISCONNECT ALL POWER BEFORE SERViCiNG
WARNING-ELECTRIC SHOCK HAZARD,CAN CAUSE INJURY
OR DEATH. UNIT MUST BE GROUNDED IN
ACCORDANCE WITH NATIONAL AND LOCAL CODES
sT,
S74
P35 ,
TJ
L,I?
L(RI <- " FIELD WIRING
,'_ t . I POWEBSUPPLY
C4 J _ C7
C_ Z_NOTE-FOR USE WITH COPPER CONDUCTORS
ONLY. REFER TO UNIT RATING PLATE FOR
ILD J35 MINIMUM CIRCUIT AMPACITY AND MAXIMUM
I_T_III OVERCURRENT PROTECTION SIZE
z_CONNECTIONS FOR REMOTE MOUNTED SMOKE
-8 DETECTOR AIT, MAX LOAD O. IVA 2AVAC
Is[ CLASS 1I
!¢V ()Z_OEFROST THERMOSTAT OPEN (16oC) 60°F
CLOSE (2_C) 35_F
_1 (_Z_ IMPORTANT= TO PREVENT MOTOR BURNOUT,
NEVER CONNECT MORE THAN ONE MOTOR
LEAD TO ANY ONE CONNECTION. TAPE
IST UNUSED MOTOR LEADS
:DI K_I.)_J3S-3
BLOWER []
HEAT I []
REV VALVE []
COOL [ []
24V COMMON []
DENOTES OPTIONAL COMPONENTS
DESCRIPTION
KEY COMPONENT
AI7 (S_E NOT_ _)
61 COMPRESSOR
83 _OTOR_BLOWER
B4 _OTOR-OUTDOOR FAN
CI ]APACITOR-OUTDOOR FAN
C4 :APACITOR-BLOWER MOTOR
C5 :APACITOR-COMPRESSOR
C7 ;APACITOR-COMPRESSORIHARD START
CMCI TIMER-DEFROST_COMPRESSOR
F1 =USE-TRANSFORMER Tl
J35 JACK-TEST
J43 JACK-BLOWER MOTOR
KI,-I ]ONTACTOR_COMPRESSOR
K3,-I,2 3ONTACTOR-BLOWER
K4,-1_2_3 RELAY-DEFROST
KIO,-I,2 RELAY-OUTDOOR FAN
K31 RELAY-HARD START KIT
KS8,-I R_AY-LOW AMbieNT KIT
LI CALVE-REVERSING
P2 aLUG-ELECTRIC HEAT
P35 _LUG-TEST
P43 _LUG_BLOWER MOTOR
54 SWITCH-LIMIT_HI PRESS(MANUAL RESET
$6 THERMOSTAT-DEFROST
SIi SWITCH-LOW PRESS,LOW AMB KIT
546 SWITCH-PRESSURE_ DEFROST
574 SWITCH-FIRESTAT I
575 SWITCH-FIRESTAT 2
T[ [RANSFORMER=CONTRO_
TBI TERMINAL STRIP-LOW VOLTAGE
LINE VOLTAGE FIELD INSTALLED
/ENNI_.__¢_ ......z_. WIRING DIAGRAMI6/gB I
HEAT PUMPS-PACKAGED
__220-240/50/I __
HEAT PUMP SECTION B25
SEE PICTORIAL FIGURE 7
FIGURE 9
Page 8
$11 LOW AMBIENT CONTROL SWITCHES
OUTDOOR FAN DIRECTLY (LINE VOLTAGE)
SINGLE PHASE
)m
K4
DEFROST
RELAY
\REMOVE THIS
WIRE
TO:
K1-1 TERMINAL T1
K31 TERMINAL 5
K69 TERMINAL L1
COMPRESSOR TERMINAL BOX TERMINAL 1
I1
I I
L1
REVERSING
VALVE
Sll
LOW
AMBIENT
PRESSURE
SWITCH
I
I
---_ 12_,_°_g
N a IRE_AY
I
I
TO 24V COM
B4
OUTDOOR
FAN MOTOR
TO C12
TERMINAL F
TO K31 TERMINAL 4
FIELD WIRING
FACTORY WIRING
SEE SCHEMATIC FIGURE 11
FIGURE 10
Page 9
TYPICAL SINGLE-COMPRESSOR, TWO-STAGE, SINGLE PHASE HEAT PUMP UNIT WIRING DIAGRAM
($11 Low Ambient Control Switches Outdoor Fan Directly)
ECON
Y2
0
I
KI=
4
T-
_2_ LO-SPEEDSTART
_WINDING
TERM BOX
AI4[_
24V POWER
4'r
TBI5 _]
HB
DS
ECON
BLOWER
NOTE-
ELECTRIC SHOCK HAZARD,CAN CAUSE INJURY
OR DEATH. UNIT MUST BE GROUNDED IN
ACCORDANCE WITH NATIONAL AND LOCAL CODES.
_DENOTES OPTIONAL COMPONENTS
z_sS54 HOOKUP WITH WHITE-ROOGERS OR
HEATCRAFT ELECTRONIC THERMOSTAT
Z_SSA & RT3 HOOKUP WITH
GE OR HONEYWELL THERMOSTAT
z_FUELMASTER HOOKUP (WF)
DESCRIPTION
KEY COMPONENT
M4 CONTROL-TWO SPEED
3_COMPRESSOR
_AMOTOR-OUTDOOR FAN
_7 CAPACITOR-COMP,HARO START
_l_ CAPACITOR-DUAL
CMCICONTROL-OEFROST,COMPRESSOR I
HRE HEATER-COMPRESSOR 1
J44 JACK-TWO SPEED CONTROL
<I =1 2 CONTACTOR-COMPRESSOR I
<4 _1 2 _ RELAY_DEFROST I
<3_RELAY-HARD START
<58,-I RELAY-LOW AMBIENT
<_9,-!,_ CONTACTOR-COMPRESSOR,TWO SPEE[
_1 VALVE-REVERSING
_44 PLUG-TWO SPEED CONTROL
R2i RESISTOR_BLEED
RT3 SENSOR=AMBIENT COMPENSATION
34 SWITCH-LIMIT,HI PRESS,COMP I
Sil SWITCH-LOW PRESS, ILOW AMB./
_40 THgRMOSTAT-CRANKCASE
554 THERMOSTAT- SERVICE LIGHT
TI9 TRANSFORMgR-COOg!NG CONTROL
TBI5 TERMINAL STRIP-LOW VOLTAGE
_]AUX HEAT I
I AUX HEAT 2
L wP
Eiii]COOL/HEAT 2
REV VALVE
E_]COOL/HEAT I
554
?_ 24v COMMON
A FOR USE WITH COPPER
CONDUCTDRS ONLY,
REFER TO UNIT RATING
PLATE PDR MINIMUM
CIRCUIT AMPACITY
AND MAXIMUM FUSE SIZE
A COMPRESSOR MOTOR
THERMALLY PROTECTED
LINE VOLTAGE FIELD INSTALLED
CLASS II VOLTAGE FIELD WIRIING
L.mNNnX±_t.,_,o.,._. WIRINGDIAGRAMIBx93I
H_ PUMP-OUTDOOR UNITS 4
HPZI-411,511,651=4-P /
208-230/60/ I /
-- -- 4
HEAT PUMP SECTION-ZB46 |
@
<
_S
o_
Y_
o
5
SEE PICTORAL FIGURE 10
FIGURE 11
Page 10
$11 LOW AMBIENT CONTROL SWITCHES
OUTDOOR FAN DIRECTLY (LINE VOLTAGE)
THREE PHASE
K4
DEFROST
RELAY
_m
I1
I I
L1
REVERSING
VALVE
!
$11
LOW
AMBIENT
.... PRESSURE
SWITCH
LIi &l
I
I
TO 24V COM
K58 LOW
AMBIENT
RELAY
TO K10-1
TERMINAL 3
REMOVE THIS
WIRE "_
B4
FAN MOTOR
Cl
FIELD WIRING
FACTORY WIRING
SEE SCHEMATIC FIGURE 13
FIGURE 12
Page 11
TYPICALSINGLE-COMPRESSOR, TWO-STAGE, THREE PHASE HEAT PUMP UNIT WIRING DIAGRAM
($11 Low Ambient Control Switches Outdoor Fan Directly)
HB (FOR G21V)
--{_RGEIVB.CB,
DS CBH21V)
ECON
G
wl
wZ
Y2
0
YE
24V POWER
HB
DS
ECON
z_ FUELMASTER HOOKUP(WFI BLOWER
NOTE-
ELECTRIC SHOCK HAZARD,CAN CAUSE INJURY
OR DEATH.UNIT MUST BE GROUNDED IN
ACCORDANCE WITH NATIONAL AND LOCAL CODES.
-..e------DENOTES OPTIONAL COMPONENTS
FOR USE WITH COOPER CONDUCTORS ONLY.
REFER TO UNIT RATING PLATE FOR MINIMUM
CIRCUIT AMPACITY AND MAXIMUM FUSE SIZE.
z_ COMPRESSOR MOTOR THERMALLY PROTECTED
$54 HOOKUP WITH WHITE-ROOGERS OR
Z_HEATCRAFT ELECTRONIC THERMOSTAT
<IOz_40_RH_T5 HOOKUP WITH
NEVWELL THERMOSTAT
DESCRIPTION
KEY 20MPONENT A
AI4 CONTROL-TWO SPEED /2_
BI COMPRESSOR
B4 MOTOR-OUTDOOR FAN I
CE CAPACITOR-OUTDOOR FAN E
CMCI CONTROL-DEFROST,COMPRESSOR I
HRI HEATER-COMPRESSOR I
J44 JACK=TWO SPEED CONTROL
KI,-I,2 CONTACTOR-COMPRESSOR I
K4,-I_Z,5 RELAY-DEFROST I
]
k
_AUX HEAT I
AUX HEAT 2
WF
_COOL/HEAT 2
REV VALVE
COOL/HEAT I
RTS
24V COMMON
$
<
E3
g
E
2
1_
<
LINE VOLTAGE FIELD INSTALLED
CLASS II VOLTAGE FIELD WIRING
_AI4
KEO,-I
KSG,-I
K69.=1,2
LI
P44
RT5
S4
SII
$40
SSA
TI9
TBi5
CONTACTOR-OUTOOOR FAN
RELAY-LOW AMBIENT
CONTACTOR=COMPRESSOR_TWO SPEED
VALVE-REVERSING
PLUG=TWO SPEED CONTROL
SENSOR AMBIENT COMPENSATION
SWITCH-LIMIT,HI PRESS,COMP I
SWITCH-LOW PRESS.(LOW AMB,)
THERMOSTAT-CRANKCASE
THERMOSTAT-SERVICE LIGHT
TRANSFORMER-COOLING CONTROL
TERMINAL STRIP=LOW VOLTAGE
LENNnX,_ ....... ,_. WIRINGDIAGRAM]GZg_I
HEAT PUMP-OUTDOOR UNITS
HP21-415,513,653-2,5,4-Y 1
208=230/60/5
SEE PICTORAL FIGURE 12
FIGURE 13
Page 12
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