Installation Manual

Signal Cable Wiring Diagram(s) for Multi-Circuit Condenser Units

Note Prior to Installation:
The connection cables must be plugged into the corresponding terminals as shown below. Terminal A on the outdoor unit must be connected with Terminal A on the indoor unit, B to B, and so on.

Diagram Description: The diagram shows the outdoor unit with terminals L1, L2, and Ground. It connects via black (BK), white (WH), and green (GN) wires to the power supply. The outdoor unit's terminals connect to multiple indoor units (A, B, C, D) via signal cables. Each indoor unit has terminals labeled 1, 2, 3, and Ground. The wiring shows specific color codes (YE, WH, BK) for connections between the outdoor and indoor units, ensuring correct terminal pairing (e.g., A to A, B to B).

CAUTION

CROSS-WIRING IS A VERY EASY MISTAKE TO MAKE. ALWAYS DOUBLE CHECK THAT THE LINE GOING FROM A GIVEN TERMINAL BLOCK IS CORRESPONDING TO THE CORRECT ONE INDOOR.

Connecting Refrigerant Piping for Multi-Circuit Condenser Units

Note Prior to Installation:
The process for connecting the copper refrigerant lines for indoor and outdoor units is detailed in the full installation manual. Repeat the process for connection and leak-checking according to the number of zones to be installed. All pipe sets use a 1/4" diameter size for the liquid (smaller) side. The gas (bigger) line may require adapters to convert the 3/8" size to 1/2" or 5/8". Use the included adapters according to the zone combination to be installed, and refer to the installation manual for proper torquing values.

Diagram Description: The diagram illustrates the process of connecting refrigerant lines. It shows an outdoor unit with a valve cover being removed. It also depicts line sets with flare nuts, and the incorporation of adapters for 3/8" to 1/2" or 3/8" to 5/8" conversions.

Regarding the Scope of this Technical Document

Note Prior to Installation:
This manual supplements the default User and Installation Manual provided with the indoor air handler for multi-zone system installations. The installation process for a multi-split system is similar to a single-split system, with additional repeated steps and details provided herein.

Allowable Zone Combinations for Multi-Circuit Condenser Units

• Different models of all available matching indoor units can be combined in any order to create a multi-zone split system, up to the number of available circuits.
• Not all available circuits need to be utilized with an attached indoor unit. 66% or higher of the total capacity utilization is recommended.
• Each indoor unit in a multi-zone system operates at a self-regulated capacity (30% to 100% of its rated capacity) based on measured demand, or turns OFF as needed.
• Outdoor units self-regulate their total output capacity based on the total demand from simultaneously running indoor units, up to their maximum rating.
• In multi-split systems, the total demand from the outdoor unit seldomly exceeds 75% of the combined indoor unit capacity due to load fluctuations. Therefore, total attached indoor unit capacity can be selected up to 133% of the supporting outdoor unit's rated capacity.
• If the total demand from the combined indoor units exceeds the outdoor unit's rated capacity, each indoor unit's capacity will be attenuated accordingly.
• For high demand applications, max loading limits may need to be reduced up to 20% to avoid underperformance risks during extreme conditions.
• The BTU order of attached indoor units does not affect performance.

Allowable Connected Piping Length and Elevation Differences

Note Prior to Installation:
When installing multiple indoor units to a single outdoor unit, ensure the refrigerant pipe length and drop height between units meet the requirements illustrated in the following diagram.

Diagram Description: The diagram shows an outdoor unit connected to multiple indoor units. It illustrates the maximum height difference between the outdoor unit and indoor units (15m / 50ft), and the maximum total height difference between indoor units (30m / 100ft). It also indicates the maximum allowable piping lengths for different zone configurations.

Rebalancing Refrigerant Levels Based on Combined Piping Length

For installations with connected lengths exceeding standard, add additional R410a refrigerant based on the following:

Unit: m/ft. *For any 24K BTU air handlers attached, let L for that length equal 2L.