Instruction Manual

ManualsBrandsLennox ManualsAmbient KitLENNOX 34M72 Low Ambient Kit

Page 1

INSTALLATION INSTRUCTIONS FOR LOW AMBIENT KIT

USED ON KG/KC/KH 156-300 PACKAGED ROOFTOP UNITS

507203-02

5/2022

Supersedes 3/2018

2022

LOW AMBIENT KIT

PACKAGED UNITS KITS

AND ACCESSORIES

Shipping and Packing List

10T62

Package 1 of 1 contains:

2- Pressure switches (S11, S84)

1- Wire harness

5- Wire ties

2- Valve depressor tees

6- Insertion wire ties

10T63 & 10T64

Package 1 of 1 contains:

3- Pressure switches (S11, S84, & S85)

1- Wire harness

5- Wire ties

3- Valve depressor tees

6- Insertion wire ties

10T65

Package 1 of 1 contains:

4- Pressure switches (S11, S84, S85, S94)

1- Wire harness

5- Wire ties

4- Valve depressor tees

6- Insertion wire ties

55W72

Package 1 of 1 contains:

3- Pressure switches (S11, S84, & S85)

3- Wire harnesses

5- Wire ties

3- Valve depressor tees

6- Insertion wire ties

55W73

Package 1 of 1 contains:

2- Pressure switches (S11, S84)

2- Wire harnesses

5- Wire ties

3- Valve depressor tees

6- Insertion wire ties

Application

See table 1 for usage.

TABLE 1

Unit Cat. # Assembly

KGA/KCA 180S 10T62

603364-24

KGA/KCA 156H, 210S

KGB/KCB 180S, 210S

10T63

603364-25

KGA/KCA 180H, 210H, 240S, 300S

KGB/KCB 240S

10T64

603364-26

KGA/KCA 240H, 300H

KGB/KCB 300S

10T65

603364-27

KG/KC 180-300* 55W72

LB-107318BD

KH 180, 240 55W73

LB-107318BE

*Units built before 6/24/13.

CAUTION

As with any mechanical equipment, contact with

sharp sheet metal edges can result in personal in

jury. Take care while handling this equipment and

wear gloves and protective clothing.

WARNING

Improper installation, adjustment, alteration, ser

vice or maintenance can cause property damage,

personal injury or loss of life. Installation and ser

vice must be performed by a licensed professional

HVAC installer or equivalent, service agency, or the

gas supplier

The low ambient pressure switches cycle 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 0°F (-17.8°C) unless

otherwise noted in the Engineering Handbook.

Install a belly-band style crankcase heater on

compressors which don't have one.

Summary of content (12 pages)

PAGE 1
2022 PACKAGED UNITS KITS AND ACCESSORIES 507203-02 5/2022 Supersedes 3/2018 LOW AMBIENT KIT INSTALLATION INSTRUCTIONS FOR LOW AMBIENT KIT USED ON KG/KC/KH 156-300 PACKAGED ROOFTOP UNITS Shipping and Packing List 10T62 Package 1 of 1 contains: 21526- Application See table 1 for usage.
PAGE 2
TABLE 2 Pressure Switch Installation Unit 1- Disconnect power to unit. 2- Refer to table 2 for figure number showing switch location. Open appropriate unit panel. 3- Install teevalve depressors on liquid line pressure taps. Install the pressure switches on the teevalve depressors. 4- Check system for leaks.
PAGE 3
PRESSURE SWITCH LOCATION KGA/KCA 156H, 180H, 210S/H, 240S, 300S AND KGB/KCB 180S, 210S, 240S UNITS S85 PRESSURE SWITCH S84 PRESSURE SWITCH S11 PRESSURE SWITCH FIGURE 2 PRESSURE SWITCH LOCATION - KH 180 & 240 UNITS S11 PRESSURE SWITCH S84 PRESSURE SWITCH FIGURE 3 Page 3
PAGE 4
PRESSURE SWITCH LOCATION KGA/KCA 240H & 300H AND KGB/KCB 300S UNITS S11 PRESSURE S84 SWITCH PRESSURE SWITCH S85 PRESSURE SWITCH S94 PRESSURE SWITCH FIGURE 4 Page 4
PAGE 5
TABLE 3 Pressure Switch Wiring - KG/KC Units Built After 6/24/2013 Unit 1- Disconnect unit wires marked S11 and S84/S94 as shown in figure 5. 2- Wire pressure switches. Refer to table 3 For appropriate wiring diagrams. 3- Bundle wiring components. and secure away from unit KGA/KCA 180S Figure 6 KGA/KCA 210, 156H KGB/KCB 180S, 210S Figure 7 KG/KC 240H, 300H Figure 8 KG/KC 240S, 300S, 180H & 210H Figure 9 4- Close all unit panels and restore power to unit.
PAGE 6
WIRING - KGA/KCA 180S UNITS WIRING - KGA/KCA 210S, 156H AND KGB/KCB 180S, 210S UNITS S11 S11 K10-A2 K10-A1 S11 S11 A DISCONNECT UNIT WIRES AS SHOWN IN FIGURE 5 B A K10 B K10 K10-A2 K10-A1 KIT WIRE HARNESS DISCONNECT UNIT WIRES AS SHOWN IN FIGURE 5 KIT WIRE HARNESS S11 S11 S11 S11 S11 S11 S84 S84 S84 S84 S84 S84 FIGURE 6 S85 S85 S85 FIGURE 7 Page 6
PAGE 7
WIRING - KGA/KCA 240S, 300S, 180H & 210H AND KGB/KCB 240S UNITS WIRING - KGA/KCA 240H & 300H AND KGB/KCB300S UNITS S11 S11 S11 S11 A A B K10-A2 DISCONNECT UNIT WIRES AS SHOWN IN FIGURE 5 K10-A1 S94 K10-A2 DISCONNECT UNIT WIRES AS SHOWN IN FIGURE 5 K10-A1 S84 S84 S94 A A B K149/K150-A2 K150-A1 K149/K150-A1 DISCONNECT UNIT WIRES AS SHOWN IN FIGURE 5 DISCONNECT UNIT WIRES AS SHOWN IN FIGURE 5 KIT WIRE HARNESS S11 B K149/ K150 K150 K150-A2 B K10 K10 S11 KIT WIRE HARNESS S11 S11
PAGE 8
WIRING - KH 180 & 240 UNITS CMC1 K10-A CMC1-0-OUT A 0-OUT CMC1-0-OUT B K10 Disconnect wire to K10, K149 relay coil. K149-A A Disconnect wires to 0-OUT.
PAGE 9
FIGURE 11 Page 9
PAGE 10
Pressure Switch Wiring KG/KC 180-300 Units Built Before 6/24/2013 WIRING - KG/KC 180 UNITS K10-A A 1- KG/KC 180 & 210 Units - Disconnect unit wire to K10-A. KG/KC 240 & 300 Units - Disconnect unit wire to K10-A and K149-A. 2- Wire pressure switches. Refer to table 5 for appropriate wiring diagram. See figure 12 to connect harness wire to K10 or K10 and K149. NOTE - Three different wiring harnesses are provided in this kit.
PAGE 11
WIRING - KG/KC 210 UNITS WIRING - KG/KC 240 & 300 UNITS K10-A K10-A A K149-A B A K10 Disconnect wire to K10 relay coil. A Connect to harness wire marked K10-A2, K149 relay coil. K10-A1 A B K149 Disconnect wire to K10, K149 relay coil.
PAGE 12
Operation KH 180 & 240 CONDENSER FANS Outdoor fans will be energized when the liquid pressure rises to 450 psig (3103kPa) and de-energize when liquid pressure drops to 240 psig (1655kPa). KG/KC 180S, 210S & 156H Outdoor fans cycle together (all switches must be open). KG/KC 240S, 300S & 180H, KGA/KCA300S Outdoor fans 1 & 2 cycle together; outdoor fans 3 & 4 cycle together. See figure 16. COND. FAN 1 INDOOR COIL BLOWER COND.