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
M4THS1509A M4THS1512A M4THS1518A M4THS1524A
M4MHW1509A M4MHW1512A M4MHW1518A M4MHW1524A
Refrigerant Charge (oz.) 24.7 30 49.4 65.3
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)
20 (65)
Length m (ft)
30 (100) 40 (130)
Minimum Piping Length m (ft) 3 (10)
Compressor Oil Used DAPHNE FVC50K (PVE Oil) RB68EP (POE Oil)
Cooling Only
M4TCS1509A M4TCS1512A M4TCS1518A M4TCS1524A
M4MCW1509A M4MCW1512A M4MCW1518A M4MCW1524A
Refrigerant Charge (oz.) 24.7 30 35.3 56.4
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)
20 (65)
Length m (ft)
30 (100) 40 (130)
Minimum Piping Length m (ft) 3 (10)
Compressor Oil Used DAPHNE FVC50K (PVE Oil) RB68EP (POE Oil)
10 88-M4MHW15-1D-EN
Installer's Guide
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