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Installer's Guide
Connection Pipe Requirements
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.
Heat Pump
Refrigerant Charge (oz.)
Standard Length ft (m)
Additional Refrigerant Charge (oz/ft)
For Piping Beyond Standard Length
Liquid Pipe in. (mm)
Outer Diameter
Gas Pipe in. (mm)
Height ft. (m)
Max Distance
Length ft. (m)
Minimum Piping Length ft. (m)
Compressor Oil Used
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).
Operating Ranges
Heating Operating Range
Cooling Operating Range
Indoor Operating Range
10
NOTICE
M4THS2309
M4MHW2309
36
0.2
3/8" (9.5)
32.8 (10)
49.2 (15)
FW68DA
Outdoor Temperature -22 - 86°F (-30 - 30°C)
Outdoor Temperature -20 - 122°F (-29 - 50°C)
Indoor Temperature
M4THS2312
M4THS2318
M4MHW2312
M4MHW2318
47
56
25 (7.6)
Φ 1/4" (6.35)
Φ 1/2" (12.7)
65.6 (20)
10 (3)
RB68EP
61 - 86°F (16 - 30°C)
M4THS2324
M4MHW2324
64
0.5
5/8" (15.9)
65.6 (20)
98.4 (30)
FW68DA
88-M4MHW23-1A-EN
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