KGC KCC 23V26 Packaged Rooftop Units Instruction Manual

KGC KCC 23V26 Packaged Rooftop Units

Product Specifications

• Model: Low Ambient Kit
• Part Number: 23V26; 619589-10
• Compatibility: KGC/KCC300 Packaged Rooftop Units
• Supersedes: 507917-03

Product Usage Instructions

Installation

1. Disconnect all power to the unit and open access panels.
2. Install head pressure controls (A190 & A191) in the control section as shown in the provided figure. Secure with screws.
3. Using the ICM Omni App, set the head pressure controller parameters as follows:
   • Probe Type: Pressure
   • Setpoint: 355 psig
   • Hard Start: 0.1s
   • Minimum Voltage Output: 32%
4. Install the temperature switch mounting bracket onto the mullion. Align and secure with the provided screw.
5. Install the temperature switches onto the bracket.
6. Install the pressure transducers on compressor 1 and compressor 2 liquid line pressure tap as shown in the provided figure.

Low Voltage Wiring

1. Disconnect unit wires routed to K10-A and K150-A and reconnect as shown in the provided figure.
2. Disconnect unit wires to CMC1-0-OUT and CMC20-OUT and reconnect as shown in the provided figure.
3. Use the provided 24V harnesses to make wire connections as shown in the provided figures.
4. Connect A188 & A189 pressure transducer quick connects to A190 & A191 head pressure controls.

Frequently Asked Questions (FAQ)

• Q: What should I do if I encounter sharp sheet metal edges during installation?
  A: Take care while handling the equipment, wear gloves, and protective clothing to prevent personal injury.

• Q: Can I perform the installation myself?
  A: Installation and service must be performed by a licensed professional installer, service agency, or gas supplier to avoid property damage or personal injury.

• Q: How do I set up the head pressure controller using the ICM Omni App?
  A: Set the Probe Type to Pressure, Setpoint to 355 psig, Hard Start to 0.1s, and Minimum Voltage Output to 32% as per the provided instructions.

PACKAGED UNITS – KITS

507203-04
10/2023
Supersedes 507917-03

LOW AMBIENT KIT

INSTALLATION INSTRUCTIONS FOR LOW AMBIENT KIT (23V26; 619589-10) USED ON KGC/KCC300 PACKAGED ROOFTOP UNITS

Shipping and Packing List

Package 1 of 1 contains:

• 2- Head pressure control (A190)
• 1- Temperature switch bracket
• 1- Wiring harness – A190 24V power
• 1- Wiring harness – A190 to K254
• 1- Wiring harness – A191 to K255
• 1-Wiring harness – K58, K118 to S201, S201 power 1-Wiring harness – K58, K118 to CMC-0-OUT power 1-Wiring harness – A190-HP to CMC-FAN1, 2 power
• 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. Con-denser fans 1, 2, 4 & 5 are de-energized.
Liquid line pressure transducers A188 and A189convert the pressure to an analog signal which is sent to the head pressure controls (A190, A191). The head pres-sure control provides a variable output which slows Condenser Fan 2 & 4 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. 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%
4. Heat pump jumper to “HP B RV”.
5. 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.
6. Install the temperature switches onto the bracket.
7. Install the pressure transducers on compressor 1 (stg. 1) and compressor 2 (stg. 2). liquid line pressure tap as shown in figure 2.

Low Voltage Wiring

1. Disconnect unit wires routed to K10-A and K150-A and reconnect. See figure 3.
2. Disconnect unit wires to CMC1-0-OUT and CMC2- 0-OUT and reconnect. See figure 3 and 4.
3. Use 24V harnesses (1), (4), (5), (6), provided in this kit, to make wire connections as shown in figure 3 and 4.
4. Connect A188 & A189 pressure transducer quick- connects to A190 & A191 head pressure controls. See figure 4.

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.

FIGURE 3

High Voltage Wire Connections

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

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