LENNOX 23V26 Low Ambient Kit Instruction Manual

LENNOX 23V26 Low Ambient Kit Instruction Manual

INSTALLATION INSTRUCTIONS FOR LOW AMBIENT KIT

Shipping and Packing List

Package 1 of 1 contains:

2- Head pressure control (A190)
1- Temperature switch bracket
1- Wiring harness – A190 to K254
1- Wiring harness – A190 to K255
1- Bag assembly containing:
2-Pressure transducers (A188, A189)
2-Temperature switches (S201, S202)
10-Wire ties
1-Wiring diagram
2-Screws, #8-32 X 1/2 TFS
2-Screws, #8-32 X 1-1/4 TFS
CAUTION
As with any mechanical equipment, contact with sharp sheet metal edges can result in personal injury. Take care while handling this equipment and wear gloves and protective clothing.

Application

This kit allows low ambient operation to 0°F (-17.8°C) unless otherwise noted in product specifications.

Operation

When ambient temperature drops below 55°F (adjustable), S201 and S202 temperature switches
open to de-energize K10 and K150 relay coils. Condenser fans 1, 2, 4 & 5 are de-energized.
Liquid line pressure transducer A188 and A189convert the pressure to an analog signal which is sent to the head pressure controls (A190, A191). The head pressure control provides a variable output which slows Condenser Fan 3 & 6 operation at lower ambient temperatures.
WARNING
Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life. Installation and service must be performed by a licensed professional installer (or equivalent), service agency or the gas supplier.

Installation

1. Disconnect all power to unit and open access panels.

2. Install head pressure controls (A190 & A191) in the control section as shown in figure 1. Secure with screws (provided).

3. Install the temperature switch mounting bracket onto the mullion. Align the bracket with the 4th screw from the top of the unit; secure with provided screw. See figure 1.

4. Install the temperature switches onto the bracket.

5. Using the ICM Omni App, set the head pressure controller as follows:
   Probe Type: Pressure
   Setpoint: 355 psig
   Hard Start: 0.1s
   Minimum Voltage Output: 32%

6. Install the pressure transducers on compressor 2 (stg. 2) and compressor 4 (stg. 4). liquid line pressure tap as shown in figure 2.

WARNING
To prevent serious injury or death:

1. Lock-out/tag-out before performing maintenance.
2. If system power is required (e.g., smoke detector mainte nance), disable power to blower, remove fan belt where applicable, and ensure all controllers and thermostats are set to the “OFF” position before performing maintenance.
3. Always keep hands, hair, clothing, jewelry, tools, etc., away from moving parts.

HEAD PRESSURE CONTROL AND TEMPERATURE SWITCH LOCATION

FIGURE 1
LIQUID LINE PRESSURE TAP LOCATION

FIGURE 2

DISCONNECT UNIT WIRING FOR S201 & S202 TEMPERATURE SWITCHES (UNIT CONTROL BOX)

FIGURE 3

Temperature Switch Wire Connections

1. Route temperature switch wires through the division panel between the compressor and outdoor coil sections. See figure 2.
2.  Disconnect male and female terminals from wires marked “S201” and “S202” near K10 relay. See figure 3.
3. Make wiring connections as shown in figure 4.

TEMPERATURE SWITCH WIRING

FIGURE 4

Low Voltage Wire Connections

Use the pressure transducer, provided in this kit, to make wire connections as shown in figure 5.

High Voltage Wire Connections

Note – K254 and K255 relay location is different for reheat units as shown in figure 1.

1. Connect the harness wire labeled “A190-L1” to the terminal marked “Line 1” on the A190 control.
2. Connect wires labeled “A190-M” & “A191-M” to the terminal marked “Motor 2” on ICM controllers A190 & A191 as shown in figure 6.
3. Connect wires labeled “A190-L2” & “A191-L2” to the terminal marked “Line 2” on ICM controllers A190 & A191 as shown in figure 6.
4. Disconnect factory wires to K254 terminals 4 & 6. Reconnect these wires to the kit harness as shown in figure 6.
5. Disconnect factory wires to K255 terminals 4 & 6. Reconnect these wires to the kit harness as shown in figure 6.
6. Make the rest of the K254 and K255 harness connections as shown in figure 6. Refer to the diagram in figure 7.
7. Make sure all connections are secure.
8. Bundle wiring and use wire ties to route wiring away from sharp edges.
9. Place the wiring diagram provided in this kit on the inside of the control door.
10. Close unit panels and restore power

PRESSURE TRANSDUCER WIRING

FIGURE 5

K254 & K255 HARNESS WIRING

FIGURE 6

WARNING-ELECTRIC SHOCK HAZARD CAN CAUSE INJURY OR DEATH.
UNIT MUST BE GROUNDED IN ACCORDANCE WITH NATIONAL AND LOCAL CODES

FOR USE WITH COPPER CONDUCTORS ONLY DISCONNECT ALL POWER BEFORE SERVICING

IF ANY WIRE IN THIS APPLIANCE IS REPLACED, IT MUST BE REPLACED WITH WIRE OF LIKE SIZE, RATING, INSULATION THICKNESS AND TERMINATION
REFER TO UNIT RATING PLATE FOR MINIMUM CIRCUIT AMPACITY AND MAXIMUM OVER CURRENT PROTECTION
F10 USED ON Y-VOLT UNITS ONLY
REFER TO INSTRUCTION SHEETS FOR LOW AMBIENT HARNESS INSTALLATION PROCEDURE

COOLING – MSAV
KG/KC C-BOX – 300S – G, J, Y VOLT LOW AMBIENT KIT
SECTION B| REV. 2
Supersedes
538043-02| New Form No.538043-03

FIGURE 7

Documents / Resources

| LENNOX 23V26 Low Ambient Kit [pdf] Instruction Manual
23V26, 619589-10, 23V26 Low Ambient Kit, 23V26, Low Ambient Kit, Ambient Kit, Kit
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