Operating Ranges
Connection Pipe Requirements
Heating Operating Range Outdoor Temperature -4 - 75°F (-20 - 24°C)
Cooling Operating Range Outdoor Temperature 0 - 115°F (-18 - 46°C)
Indoor Operating Range Indoor Temperature 61 - 86°F (16 - 30°C)
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 specications.
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 eciency, so it is preferable to reduce
connecting pipe lengths where possible.
4. Refer to the oil trap instructions for specic requirements when there is height dierence
between the indoor and outdoor unit greater than 20 ft. (6m).
Heat Pump
M4THS1809 M4THS1812 M4THS1818 M4THS1824
M4MHW1809 M4MHW1812 M4MHW1818 M4MHW1824
Refrigerant Charge (oz.) 46 48 56 78
Standard Length ft (m) 25 (7.6)
Additional Refrigerant Charge (oz/ft)
For Piping Beyond Standard Length
0.22 0.2 0.5
Outer Diameter
Liquid Pipe in. (mm) Φ 1/4" (6.35)
Gas Pipe in. (mm) 3/8" (9.525) Φ 1/2" (12.7) 5/8" (15.875)
Max Distance
Height ft. (m) 55 (16.76)
Length ft. (m) 100 (30.5) 130 (39.6)
Minimum Piping Length ft. (m) 10 (3)
Compressor Oil Used
DAPHNE FVC50K
(PVE Oil)
RB68EP (POE Oil)
10 88-M4MHW18-1C-EN
Installer's Guide
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