Instruction Manual for LENNOX models including: 23V24 Low Ambient Kit, 23V24, Low Ambient Kit, Ambient Kit, Kit
©2023 PACKAGED UNITS - KITS 507914-03 10/2023 Supersedes 507914-02 LOW AMBIENT KIT INSTALLATION INSTRUCTIONS FOR LOW AMBIENT KIT (23V24; 619589-08) USED ON KGC/KCC 180, 210 PACKAGED ROOFTOP UNITS Shipping and Packing List Package 1 of 1 contains: 1- Head pressure control (A190) 1- Temperature switch bracket 1- Wiring harness - A190 24V power 1- Wiring harness - A190 to K254 1- Bag assembly containing: 1-Pressure transducer (A188) 1-Temperature switch (S201) 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 temperature switch opens to de-energize K10 relay coil. Condenser fans 1 & 2 are de-energized. Liquid line pressure transducer A188 converts the pressure to an analog signal which is sent to the head pressure control (A190). The head pressure control provides a variable output which slows Condenser Fan 3 operation at lower ambient temperatures (A190 terminal M to B21 terminal 3). . 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 the head pressure control (A190) in the control 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 switch 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 - Set heat pump jumper to "CONTROL INPUT". 7 - Install the pressure transducer on compressor 2. 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 maintenance), 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. Page 1 A190 HEAD PRESSURE CONTROL HEAD PRESSURE CONTROL AND TEMPERATURE SWITCH LOCATION K254 RELAY TEMPERATURE SWITCH BRACKET OUTDOOR SECTION COMPRESSOR SECTION 4TH SCREW FROM THE TOP FIGURE 1 LIQUID LINE PRESSURE TAP LOCATION LIQUID LINE PRESSURE TAP COMPRESSOR 2 DIVISION PANEL FIGURE 2 Page 2 ROUTE TEMPERATURE SENSOR WIRES THROUGH HOLE IN DIVISION PANEL TEMPERATURE SWITCH WIRING DISCONNECT WIRES K10 MARKED S201 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" near K10 relay. See figure 3. 3 - Make wiring connections as shown in figure 4. TEMPERATURE SWITCH WIRING DISCONNECT UNIT WIRES MARKED S201 S201 S201 AB K10 S201 CONNECT WIRES FROM TEMPERATURE SWITCH S201 TEMPERATURE SWITCH FIGURE 4 Low Voltage Wire Connections Use the 24V harness, provided in this kit, to make transducer wire connections as shown in figure 5. High Voltage Wire Connections 1 - Disconnect factory wires to K254 terminals 4 & 6. Reconnect these wires to the kit harness as shown in figure 6. 2 - Check the voltage to the unit. Connect the harness wire labeled "A190-L1" to the Line 1 / Motor 1 120 600 VAC terminal. 3 - Make the rest of the K254 harness connections as shown in figure 6. Refer to the diagram in figure 7. 4 - Make sure all connections are secure. 5 - Bundle wiring and use wire ties to route wiring away from sharp edges. 6 - Place the wiring diagram provided in this kit on the inside of the control door. 7 - Close unit panels and restore power. Page 3 A190-24V-2 A190-24V-1 BLACK RED BLACK RED STG 1 GREEN A190 HEAD PRESSURE CONTROL 24V HARNESS WIRING A188 STG 2 PRESSURE TRANSDUCER STG 1 GREEN TB1-C TB1-R FIGURE 5 Page 4 Kit Harness 120 - 600 VAC Line 1 / Motor 1 Line 2 Motor 2 A190 HEAD PRESSURE CONTROL K254 HARNESS WIRING Disconnect factory wire labeled "K254-4" K254-4-A1 K254-6-A1 K254 LOW AMBIENT RELAY Disconnect factory wire labeled "K254-6" K254-6-A2 K254-6 Was connected to K254-6 relay K254-4-A2 K254-4 Was connected to K254-4 relay FIGURE 6 OUTDOOR FAN MOTOR 21 Page 5 24V POWER 24V COMMON TB13 A190 GND 24V +5V COM T2/P2 T1/P1 BLK RED B,W,G A188 7 K66-1 4 10 X 8 INCHES R 24V POWER TB1 S50 P35 6 J35 S7 S49 P35 10 J35 S4 S201 P35 4 J35 3 A A A A K10 K2 K1 K254 B B B B TB1 C F10 24V COMMON K1-1 L1 L2 L3 L1 L2 L3 L1 L2 L3 K2-2 K14-1 K2-1 T1 T2 T3 C T1 T2 T3 C T1 T2 T3 C K14-2 K1-2 NC B1 HR1 NC B2 HR2 NC B13 HR5 K10-1 K10-2 7 9 4 6 P36 J36 1 1 C1 2 1 C2 2 2 J86 1 P86 2 P86 3 J86 4 5 6 32 1 B4 32 1 B5 79 K254 A190 L2 L1 M 46 P36 J36 3 1 C18 2 J86 7 8 9 P86 32 1 B21 KEY A188 A190 B1 B2 B4 B5 B13 B21 C1 C2 C18 J/P 35 J/P 36 HR1 HR2 HR5 K1,-1,2 K2,-1,2 K10,-1, 2 K14,-1,2 K66,-1 K254 COMPONENT PRESSURE TRANDUCER, COMP 2 PRESSURE CONTROLLER, COMP 2, LOW AMBIENT KIT COMPRESSOR 1 COMPRESSOR 2 MOTOR, OUTDOOR FAN 1 MOTOR, OUTDOOR FAN 2 COMPRESSOR 3 MOTOR, OUTDOOR FAN 3 CAPACITOR, OUTDOOR FAN 1 CAPACITOR, OUTDOOR FAN 2 CAPACITOR, OUTDOOR FAN 3 JACK/ PLUG, RUN TEST JACK/ PLUG, RUN TEST OD FANS HEATER, COMPRESSOR 1 HEATER, COMPRESSOR 2 HEATER, COMPRESSOR 3 CONTACTOR, COMPRESSOR 1 CONTACTOR, COMPRESSOR 2 RELAY, OUTDOOR FANS 1, 2 CONTACTOR, COMPRESSOR 3 RELAY, STAGE COOL 1 RELAY, LOW AMBIENT KIT FAN 3 S4 S7 S49 S50 S201 TB1 TB13 SWITCH, LIMIT HI PRESS COMP 1 SWITCH, LIMIT HI PRESS COMP 2 SWITCH, FREEZESTAT COMP 1 SWITCH, FREEZESTAT COMP 2 SWITCH, LOW AMBIENT TEMP SENSOR 1 TERMINAL STRIP, 24V TERMINAL STRIP, POWER DISTRIBUTION 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 OVERCURRENT PROTECTION F10 USED ON Y-VOLT UNITS ONLY REFER TO INSTRUCTION SHEETS FOR LOW AMBIENT HARNESS INSTALLATION PROCEDURE DENOTES OPTIONAL COMPONENTS LIVE VOLTAGE FIELD INSTALLED WIRING DIAGRAM 10/23 FIGURE 7 COOLING - MSAV KG/KC C-BOX - 180S, 210S - G, J, Y VOLT LOW AMBIENT KIT Supersedes 538040-01 C SECTION B REV. 2 New Form No. 538040-02 Lennox Commercial Page 6Adobe PDF Library 17.0 Adobe InDesign 19.0 (Windows)