Lennox LB57113BM Installation Insrtuctions

Lennox
Brand
Lennox
Model
LB57113BM
Type
Installation Insrtuctions

Lennox LB57113BM is a low ambient control kit designed for single-compressor heat pump units. It enables the outdoor fan to operate intermittently while allowing compressor operation in the cooling cycle, preventing evaporator coil icing and loss of capacity. The kit includes a low ambient pressure switch, relay, copper tube, and other necessary components for installation. It is suitable for use in ambient temperatures no lower than 30°F and requires the addition of a belly-band style crankcase heater and a freezestat for optimal performance.

Lennox LB57113BM is a low ambient control kit designed for single-compressor heat pump units. It enables the outdoor fan to operate intermittently while allowing compressor operation in the cooling cycle, preventing evaporator coil icing and loss of capacity. The kit includes a low ambient pressure switch, relay, copper tube, and other necessary components for installation. It is suitable for use in ambient temperatures no lower than 30°F and requires the addition of a belly-band style crankcase heater and a freezestat for optimal performance.

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 Lennox Industries Inc.
Dallas, Texas
LOW AMBIENT CONTROL KIT
KITS COMMON TO HEATING
AND COOLING EQUIPMENT
INSTALLATION INSTRUCTIONS
SHIPPING AND PACKING LIST
Package 1 of 1 contains:
1- Low ambient pressure switch assembly (S11)
1- 36" (914 mm) length of 1/4" (6.35 mm) copper tube
with flare nuts
1- Relay
1- 20ĆFoot 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
APPLICATION
The low ambient pressure switch (S11) 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.
INSTALLATION
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.
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- 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 2
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 Alco 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
application.
C-Low Ambient Relay (K58)
1- Install low ambient relay in control 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
Page 3
WIRING
Low ambient pressure switch S11 is wired in series with
outdoor fan relay or compressor contactor (single-stage
or speed units).
Low ambient kits are shown with optional arrows on unit
wiring diagrams. If unit wiring diagram is not available or
does not show the low ambient kit, refer to appropriate
wiring diagram in figures 3 through 13 for wiring
connections.
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
Page 4
FIGURE 4
TYPICAL SINGLE-COMPRESSOR HEAT PUMP UNIT WIRING DIAGRAM
(S11 LOW AMBIENT CONTROL SWITCHES OUTDOOR FAN DIRECTLY)
SEE PICTORIAL FIGURE 3
Page 5
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
Page 6
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
Page 7
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
Page 8
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
Page 9
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
5
6
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
Page 10
FIGURE 11
SEE PICTORAL FIGURE 10
TYPICAL SINGLE-COMPRESSOR, TWO-STAGE, SINGLE PHASE HEAT PUMP UNIT WIRING DIAGRAM
(S11 Low Ambient Control Switches Outdoor Fan Directly)
Page 11
FIGURE 12
SEE SCHEMATIC FIGURE 13
K4
DEFROST
RELAY
9
7
5
6
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
REMOVE THIS
WIRE
FIELD WIRING
FACTORY WIRING
TO K10-1
TERMINAL 3
2
31
THREE PHASE
C1
S11 LOW AMBIENT CONTROL SWITCHES
OUTDOOR FAN DIRECTLY (LINE VOLTAGE)
4
1
Page 12
FIGURE 13
SEE PICTORAL FIGURE 12
TYPICAL SINGLE-COMPRESSOR, TWO-STAGE, THREE PHASE HEAT PUMP UNIT WIRING DIAGRAM
(S11 Low Ambient Control Switches Outdoor Fan Directly)
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Lennox LB57113BM Installation Insrtuctions

Lennox
Brand
Lennox
Model
LB57113BM
Type
Installation Insrtuctions

Lennox LB57113BM is a low ambient control kit designed for single-compressor heat pump units. It enables the outdoor fan to operate intermittently while allowing compressor operation in the cooling cycle, preventing evaporator coil icing and loss of capacity. The kit includes a low ambient pressure switch, relay, copper tube, and other necessary components for installation. It is suitable for use in ambient temperatures no lower than 30°F and requires the addition of a belly-band style crankcase heater and a freezestat for optimal performance.

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