Piping Length And Elevation - Heat Controller MMC18DA-1 Installation Instruction

Piping length and elevation

Multi-Zone Piping Recommendations:
Max total length
Capacity
(A+B/A+B+C)
18K BTU/h 30 m (100 ft)
24K BTU/h 30 m (100 ft)
36K BTU/h 45 m (150 ft)
Indoor Capacity
9K BTU/h
12K BTU/h
18/24K BTU/h
h1
CAUTION: Capacity is based on standard length and maximum allowance
length based on reliability.
Max length of
of all pipes each pipe
(A/B/C)
15 m (50 ft)
15 m (50 ft)
15 m (50 ft)
Gas (Flare)
9.52 mm (3/8")
9.52 mm (3/8")
A
B
h1
B
Min length of
each pipe
(A/B/C)
3 m (10 ft)
3 m (10 ft)
3 m (10 ft)
Pipe Size
Liquid (Flare) Standard Length
6.35 mm (1/4")
6.35 mm (1/4")
36K BTU/h
h2
Installation of Indoor, Outdoor Unit
Max Elevation
between each
indoor unit and
outdoor unit (h1)
7.5 m (25 ft)
7.5 m (25 ft)
7.5 m (25 ft)
7.5 m (25 ft) 20 g/m (0.22 oz/ft)
7.5 m (25 ft) 20 g/m (0.22 oz/ft)
A
B
h1
C
h1
h1
Installation Manual 9
Max elevation
between indoor
units (h2)
7.5 m (25 ft)
7.5 m (25 ft)
7.5 m (25 ft)
Additional
Refrigerant
h2
h2