Lennox LB57113BM Quick start guide

Page 1
INSTALLATION INSTRUCTIONS FOR LOW AMBIENT CONTROL KIT LB-57113BM (27J00)
USED WITH SINGLE-COMPRESSOR HEAT PUMP UNITS
Litho U.S.A.
502,818M
11/98
Supersedes 3/96
®
E1998 Le ox I dustries I c.
Dallas, Texas LOW AMBIENT CONTROL KIT
KITS COMMON TO HEATING
AND COOLING EQUIPMENT
INSTALLATION INSTRUCTIONS
SHIPPING AND PACKING LIST
P ck ge 1 of 1 cont ins:
1- Low ambie t pressure switch assembly (S11)
1- 36" (914 mm) le gth of 1/4" (6.35 mm) copper tube
with flare uts
1- Relay
1- 20ĆFoot le gth of wire
4- 20" Le gths of wire
1- Bag assembly each co tai i g:
8-Wire uts
2-Saddle valves
4-#10-16 X 5/8" S.D.S.T. screws
1-Schrader depressor tee with seal cap
APPLICATION
The low ambie t pressure switch (S11) cycles the
outdoor fa while allowi g compressor operatio i the
cooli g cycle. This i termitte t fa operatio results i
a high evaporati g temperature which allows the
system to operate without ici g the evaporator coil a d
losi g capacity. This kit is desig ed for use i ambie t
temperatures o lower tha 30°F.
Le ox recomme ds a belly-ba d style cra kcase heater
(P-8-8852, 240v, 45w) be added to compressors which
do ot have o e. A freezestat (LB-62858CA) should also
be added to a y system usi g a low ambie t kit.
NOTE - Do not use this low ambient kit on units with
capillar tube metering devices. Install an expansion
valve metering device if using this kit.
INSTALLATION
A-Pressure Switch Assembly
1- Disco ect power to u it.
2- Remove compressor compartme t access pa el.
3- I stall valve depressor tee discharge li e gauge port.
4- I stall pressure switch i compressor compartme t
with screws provided. Switch should be i stalled i a
vertical positio higher tha mid-poi t of compressor.
See figure 1.
FIGURE 1
TYPICAL INSTALLATION
S11 LOW AMBIENT
PRESSURE SWITCH
HIGH
PRESSURE
SWITCH
COMPRESSOR
DISCHARGE
LINE
S24 LOSS
OF CHARGE
SWITCH
VALVE
DEPRESSOR
TEE
SHOCK
LOOP
5- Co ect copper li e to low ambie t pressure
switch a d ope side of depressor tee (provided).
Provide a shock loop i copper tubi g to preve t
breakage from vibratio . Tighte co ectio s.
Depressor tee port with valve core is used as
service port. If ecessary, valve core ca be moved
to other leg of tee.

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B-Low Ambient Pressure Switch Setting (S11)
O e of two types of pressure switches are provided. The
Ra co switch has o e square a d o e rou d adjustme t
k ob a d the Alco switch has two square adjustme t
k obs.
R nco Model
The low ambie t pressure switch provided i the kit is
factory set for 285 psig (1965 kPa) cut-i a d 140 psig
(965 kPa) cut-out.
If ecessary, adjust low ambie t pressure switch as
follows:
1-Rotate rou d k ob to set cut-i pressure. Refer to right
set of i dicati g umbers o face of co trol. See
figure 3.
2- Rotate square k ob to set differe tial i dicator to 145
psig (999 kPa). Refer to left set of i dicati g umbers.
Alco Model
If ecessary, adjust low ambie t pressure switch as
follows:
1-Rotate the square k ob located o the left to set cut-i
pressure. Refer to left set of i dicati g umbers o
face of co trol. See figure 2.
2- Rotate the square k ob located o the right to set
differe tial i dicator to 145 psig (999 kPa). Refer to
right set of i dicati g umbers.
3- Use o ly termi als 1 a d 4 whe co ecti g wiri g.
NOTE - Disregard Cut out minus Diff. is Cut In"
statement on face of control. This does not appl in this
application.
C-Low Ambient Rel y (K58)
1- I stall low ambie t relay i co trol box.
LOW AMBIENT PRESSURE SWITCH S11 DETAIL
SQUARE DIFFERENTIAL
ADJUSTMENT KNOB
FIGURE 2
ROUND CUT-IN
ADJUSTMENT
KNOB
PRESSURE SWITCH IS FACTORY-SET AT 285 PSIG CUT-IN
AND 145 PSIG DIFFERENTIAL (140 PSIG CUT-OUT)
CUT-IN PRESSURE
READOUT ON
RIGHT
DIFFERENTIAL
PRESSURE READĆ
OUT ON LEFT
SQUARE DIFFERENTIAL
ADJUSTMENT KNOB
ROUND CUT-IN
ADJUSTMENT
KNOB
CUT-IN PRESSURE
READOUT ON LEFT DIFFERENTIAL
PRESSURE READĆ
OUT ON RIGHT
RANCO MODEL
ALCO MODEL

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WIRING
Low ambie t pressure switch S11 is wired i series with
outdoor fa relay or compressor co tactor (si gle-stage
or speed u its).
Low ambie t kits are show with optio al arrows o u it
wiri g diagrams. If u it wiri g diagram is ot available or
does ot show the low ambie t kit, refer to appropriate
wiri g diagram i figures 3 through 13 for wiri g
co ectio s.
8
K4
DEFROST
RELAY
97
5 64
2 31
97
64
31
S11
LOW AMBIENT
PRESSURE
SWITCH
L1
REVERSING
VALVE
B4
K58 LOW
AMBIENT
RELAY
FIGURE 3
TO 24V COM
OUTDOOR
FAN MOTOR
S11 LOW AMBIENT CONTROL SWITCHES
OUTDOOR FAN DIRECTLY (LINE VOLTAGE)
SEE SCHEMATIC FIGURE 4
TO C12
TERMINAL F
REMOVE THIS
WIRE
REMOVE THIS WIRE
FIELD WIRING
FACTORY WIRING
TO C12 TERM C
TO K1-1
D
TO R" LOW
VOLT
TERM STRIP
TO O" LOW
VOLT TERM
STRIP
TO K1-1
K31 PIN 5
COMP C"
4
1

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FIGURE 4
TYPICAL SINGLE-COMPRESSOR HEAT PUMP UNIT WIRING DIAGRAM
(S11 LOW AMBIENT CONTROL SWITCHES OUTDOOR FAN DIRECTLY)
SEE PICTORIAL FIGURE 3

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K4
DEFROST
RELAY
S11
LOW AMBIENT
PRESSURE SWITCH K58 LOW
AMBIENT
RELAY
FIGURE 5
TO 24V COM
97
64
31
8 97
5 64
2 31
97
64
31
L1
REVERSING
VALVE
K10
CONDENSER FAN
CONTACTOR
TO 24V COM
K45
REVERSING
VALVE RELAY
HP17-953, 1353 TWO-SPEED
S11 LOW AMBIENT PRESSURE CONTROL SWITCHES OUTDOOR
FAN(S) THROUGH A RELAY OR CONTACTOR (PILOT CIRCUIT)
SEE SCHEMATIC FIGURE 6
FIELD WIRING
FACTORY WIRING
24 V POWER
TO K70-1 PIN 4
A4 (R1)
REMOVE THIS WIRE
4
1

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FIGURE 6
TYPICAL SINGLE-COMPRESSOR HEAT PUMP UNIT WIRING DIAGRAM
(S11 LOW AMBIENT CONTROL SWITCHES OUTDOOR FAN THROUGH A RELAY OR CONTACTOR (PILOT CIRCUIT)
SEE PICTORIAL FIGURE 5

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FIGURE 7
TYPICAL SINGLE-COMPRESSOR PACKAGED HEAT PUMP UNIT WIRING DIAGRAM
(S11 LOW AMBIENT CONTROL SWITCHES OUTDOOR FAN DIRECTLY)
SEE SCHEMATIC FIGURE 9
CHP16-2 TO 5 TON UNITS
K58 LOW
AMBIENT RELAY
COMPRESSOR 1
97
64
31
97
64
31
K10
CONDENSER
FAN RELAY
K1
COMPRESSOR
1 CONTACTOR
L1 L2 L3
T1 T2 T3
B4
OUTDOOR
FAN MOTOR 1
P35
J35
12 13
12 13
L1
REVERSING
VALVE
S11
LOW
AMBIENT
PRESSURE
SWITCH
COMP 1
FIELD WIRING
FACTORY WIRING
C1
CAPACITOR
REMOVE THIS WIRE
4
1
FIGURE 8
TYPICAL SINGLE-COMPRESSOR LOW AMBIENT WIRING FOR UNITS CONTAINING
68J29 AND 68J84 DEFROST BOARDS (CMC1)
K58 LOW
AMBIENT RELAY
97
64
31
K1
COMPRESSOR
CONTACTOR
L1 L2 L3
T1 T2 T3
L1
REVERSING
VALVE
S11
LOW
AMBIENT
PRESĆ
SURE
SWITCH
FIELD WIRING
FACTORY WIRING
4
1
CMC1
DEFROST CONTROL
O OUT
FAN
REMOVE THIS WIRE
B4
OUTDOOR
FAN
AB

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TYPICAL SINGLE-COMPRESSOR PACKAGED HEAT PUMP UNIT WIRING DIAGRAM
(S11 LOW AMBIENT CONTROL SWITCHES OUTDOOR FAN DIRECTLY)
CHP16-2 TO 5 TON UNITS
FIGURE 9
SEE PICTORIAL FIGURE 7

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FIGURE 10
SEE SCHEMATIC FIGURE 11
TO:
K1-1 TERMINAL T1
K31 TERMINAL 5
K69 TERMINAL L1
COMPRESSOR TERMINAL BOX TERMINAL 1
K4
DEFROST
RELAY
9
7
56 4
3
1
97
64
31
S11
LOW
AMBIENT
PRESSURE
SWITCH
L1
REVERSING
VALVE
B4
K58 LOW
AMBIENT
RELAY
TO 24V COM
OUTDOOR
FAN MOTOR
TO C12
TERMINAL F
REMOVE THIS
WIRE
FIELD WIRING
FACTORY WIRING
TO K31 TERMINAL 4
2
3 1
SINGLE PHASE
S11 LOW AMBIENT CONTROL SWITCHES
OUTDOOR FAN DIRECTLY (LINE VOLTAGE)
4
1

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FIGURE 11
SEE PICTORAL FIGURE 10
TYPICAL SINGLE-COMPRESSOR, TWO-STAGE, SINGLE PHASE HEAT PUMP UNIT WIRING DIAGRAM
(S11 Low Ambient Control Switches Outdoor F n Directly)