Operating Ranges
Connection Pipe Requirements
Heating Operating Range Outdoor Temperature -22 - 86°F (-30 - 30°C)
Cooling Operating Range Outdoor Temperature -20 - 122°F (-29 - 50°C)
Indoor Operating Range Indoor Temperature 61 - 86°F (16 - 30°C)
Heating Operating Range Outdoor Temperature -13 - 75°F (-25 - 24°C)
Cooling Operating Range Outdoor Temperature -4 - 115°F (-20 - 46°C)
Indoor Operating Range Indoor Temperature 61 - 86°F (16 - 30°C)
For 4TXK2530 and 4TXK2536:
For all models (Except 4TXK2530 and 4TXK2536):
10
25 Series Single Zone
NOTICE
The maximum distance of the connection piping in both height and total length is provided in the
table below. Do not install these units in locations that exceed these specifications.
NOTES:
1. The connection pipes should be insulated with proper water-proof insulating material
2. Use type ACR copper piping.
3. Shorter connecting pipe lengths result in greater thermal efficiency, so it is preferable to reduce
connecting pipe lengths where possible.
4. Refer to the oil trap instructions for specific requirements when there is height difference
between the indoor and outdoor unit greater than 20 ft. (6m).
Heat Pump
4TXK2509 4TXK2512 4TXK2518 4TXK2524 4TXK2530 4TXK2536
4MXW2509 4MXW2512 4MXW2518 4MXW2524 4MXW2530 4MXW2536
Refrigerant Charge (oz.) 36 47 56 64 78 88
Standard Length ft (m) 25 (7.6)
Additional Refrigerant Charge (oz/ft)
For Piping Beyond Standard Length
0.2 0.5
Outer Diameter
Liquid Pipe in. (mm) Φ 1/4" (6.35)
Gas Pipe in. (mm) 3/8" (9.5) Φ 1/2" (12.7) 5/8" (15.9)
Max Distance
Height ft. (m) 32.8 (10) 65.6 (20) 32.8 (10)
Length ft. (m) 49.2 (15) 65.6 (20) 98.4 (30) 82 (25)
Minimum Piping Length ft. (m) 10 (3)
Compressor Oil Used FW68DA RB68EP FW68DA
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