Operating Ranges
Connection Pipe Requirements
Cooling Operating Range Outdoor Temperature 0 - 115°F (-18 - 46.1°C)
Heating Operating Range Outdoor Temperature -4 - 75°F (-20 - 24°C)
Indoor Operating Range Indoor Temperature 61 - 86°F (16 - 30°C)
NOTICE
The maximum length of the connection pipe is listed in the table below. Do not place the units
such that the distance between them exceeds the maximum length of the connection pipe.
NOTES:
1. The connection pipe should be insulated with proper water-proof insulating material
2. Wall thickness of pipe 0.5-1.0 mm (0.02-0.04 in): bearing pressure 435 PSI (3.0 MPa)
3. Shorter connecting pipe lengths result in greater thermal efficiency, so it is preferable to reduce
connecting pipe lengths where possible.
4. See the oil trap instructions on page 21 for specific requirements when there is height
difference between the indoor and outdoor unit greater than 20 feet.
Heat Pump
M4THS1709A M4THS1712A M4THS1718A M4THS1724A
M4MHW1709A M4MHW1712A M4MHW1718A M4MHW1724A
Refrigerant Charge (oz.) 24 28.2 42.3 52.9
Standard Length m (ft) 7.6 (25)
Additional Refrigerant Charge (oz/ft)
For Piping Beyond Standard Length
0.2 0.5
Outer Diameter
Liquid Pipe mm (in)
Φ 6.35 (1/4")
Gas Pipe mm (in)
Φ 9.52 (3/8") Φ 12.7 (1/2") 15.875 (5/8")
Max Distance
Height m (ft)
10 (32.8)
Length m (ft)
15 (49.2) 20 (65.6) 25 (82)
Minimum Piping Length m (ft) 3 (10)
Compressor Oil Used FW68DA RB68EP FW68DA
Cooling Only
M4TCS1709A M4TCS1712A M4TCS1718A M4TCS1724A
M4MCW1709A M4MCW1712A M4MCW1718A M4MCW1724A
Refrigerant Charge (oz.) 19.1 25 37 52.9
Standard Length m (ft) 7.6 (25)
Additional Refrigerant Charge (oz/ft)
For Piping Beyond Standard Length
0.2
Outer Diameter
Liquid Pipe mm (in)
Φ 6.35 (1/4")
Gas Pipe mm (in)
Φ 9.52 (3/8") Φ 12.7 (1/2") 15.875 (5/8")
Max Distance
Height m (ft)
10 (32.8)
Length m (ft)
15 (49.2) 20 (65.6) 25 (82)
Minimum Piping Length m (ft) 3 (10)
Compressor Oil Used FW68DA
10 88-M4MHW17-1A-EN
Installer's Guide
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