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Heat Controller, Inc. VMH SerieS Service Manual
10
7. Installation Details
7.1 Wrench torque sheet for installation
Outside diameter Torque Additional tightening torque
mm inch
N
.
m
N
.
m
Ф6.35 1/4 15(153kgf.cm) 16(163kgf.cm)
Ф9.52 3/8 25(255kgf.cm) 26(265kgf.cm)
Ф12.7 1/2 35(357kgf.cm) 36(367kgf.cm)
7.2 Connecting the cables
The power wiring should always follow NEC and local codes, with respect to the unit’s, rating plate. See
installation manual for additional information. Main power connection is 208/230V/1PH~60HZ.
The communicating cable, which connects between the indoor and outdoor units must meet all NEC and
local codes, with respect to the unit’s rating plate. We recommend using 14 AWG/4 conductor Stranded THHN
6
Ф Ф V cable.
Pipe length and elevation
Unit
Pipe size
Standard
length
(m)
Max.
Elevation
B (m)
Max.
Length
A (m)
Additional
refrigerant
(g/m)
Gas inch
(mm)
Liquid inch
(mm)
9K 3/8’’ (Ф9.52) 1/4’’ (Ф6.35)
(5)
16.5ft
(10)
33ft
(15)
50ft
(20)
0.2 oz/ft
12K/18K 1/2’’ (Ф12.7) 1/4’’ (Ф6.35)
Max. Total length for all rooms
Dual-zone(m) Tri-zone(m) Quad-zone(m)
(30)100ft (45)150ft (60)200ft
NOTES:
Capacity test is based on standard length and maximum allowance length is based on reliability.
Oil trap should be installed per (3-5 meters)10-15ft.
Outdoor connections are ¼” (Ф6.35 mm) liquid and 3/8” (Ф9.52 mm) gas, therefore a reducer is
provided with all 12/18k indoor sections.
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