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✅ Quick Install Overview: Line Set Sizes, Controls, Accessories, and Compatibility
Model Series: D5CURAH (18K–60K BTU)
🔧 Line Set Sizes & Refrigerant
| Model | Liquid Line | Suction Line | Max Length | Max Elevation | Charge | Add. Charge |
|---|---|---|---|---|---|---|
| 18K | 3/8" | 3/4" | 82 ft | 49 ft | 4.63 lbs | 0.7 oz/ft beyond 24.6 ft |
| 24K | 3/8" | 3/4" | 98 ft | 49 ft | 6.39 lbs | 0.7 oz/ft beyond 24.6 ft |
| 36K | 3/8" | 3/4" | 164 ft | 66 ft | 7.72 lbs | 0.7 oz/ft beyond 24.6 ft |
| 48K | 3/8" | 3/4" | 213 ft | 98.4 ft | 9.92 lbs | 0.7 oz/ft beyond 24.6 ft |
| 60K | 3/8" | 3/4" | 246 ft | 98.4 ft | 11.46 lbs | 0.7 oz/ft beyond 24.6 ft |
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Refrigerant Type: R-454B
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Min Pipe Length: 10 ft (3 m)
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Adapters: Included where needed (e.g., 5/8" to 3/4" flare on 18K models)
🎛 Control Wiring Scenarios
Scenario 1 – 24V Thermostat + RS485 Comm *16awg, stranded/ Shielded wire must be used
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Uses indoor unit R, C, Y1, Y2, B, W, D terminals
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Do not use outdoor 24V terminals
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B and W terminals must not be used together
Scenario 2 – ICP Communicating Controller (Part #: KSACN1401AAA)
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Full RS485 communication * 16awg, stranded/ Shielded wire must be used.
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No 24V wiring required at indoor or outdoor units
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DIP switch 2 = OFF
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Factory default configuration
Scenario 3 – Thermostat Only
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24V signals from outdoor unit terminals
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For 3rd-party air handlers/furnaces
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DIP switch 2 = ON
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S1 and S2 not used in this setup
Note: Incorrect wiring or DIP switch settings can cause irreversible damage to the system.
📦 Included Accessories
| Item | Quantity |
| Drain Fitting | 1 |
| Gasket (not used for 48K/60K) | 1 |
| Flare-to-Braze Adapter | 2 |
| 5/8" to 3/4" Flare Adapter (18K only) | 1 |
| 6-Foot Drain Tubing | 1 |
Note: Interconnecting line set and wiring are field-supplied.
Key Installation Considerations:
✅ Key Installation Requirements for Heat Pump System Setup
Make sure to follow these essential guidelines to ensure proper operation and avoid callback issues:
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AHRI-Matched System
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The outdoor and indoor units must be an AHRI-approved match to ensure efficiency, proper performance, and warranty validation.
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Thermostat Wiring
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Run a minimum 5-conductor thermostat wire to the outdoor unit to support all necessary communication and control functions.
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Thermostat Compatibility
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Use a 24V heat pump-compatible thermostat (e.g., Honeywell, Ecobee, White Rodgers). Avoid using incompatible models that lack heat pump support.
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Two Power Sources
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Ensure separate electrical power is provided to both the indoor and outdoor units. This system requires two points of power.
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TXV Notice
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Do NOT remove the TXV from the indoor unit. Factory-installed TXVs are designed to function with the matched system.
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Airflow Requirements
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Verify airflow carefully—a minimum of 350 CFM per ton is required. Poor airflow can lead to performance issues and system failure.
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Outdoor Unit Configuration
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Outdoor unit DIP switch #2 must be ON to enable Crossover Mode (used for specific control strategies or thermostat settings).
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System Compatibility Warning
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This system is NOT compatible with Communicating ION controls. If ION functionality is needed, consider using the ION Gray thermostat, as it is 24 volt.
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Wiring Configurations:
o There are 3 ways that we can configure
• Scenario 1: Outdoor to Indoor communication with S1/S2 and 24V 3rd-party Thermostat
• Scenario 2: Full communication with S1/S2 and HA/HB on the controller.
• Scenario 3: Full 24V communication with 3rd-Party Thermostat
WIring using scenario 1 only with air handler and outdoor unit and 24v thermostat:
Wiring using Scenario 2 with Dual Fuel furnace and a D5FULA cased coil.
Scenario 3 Wiring with full 24v control. Furnace and TXV coil (AHRI Matchup)
