Step 4 - Interconnecting The Indoor And Outdoor Units - Haier HSU09VHG-W Installation Manual

Step - 3.3
3.3
Connect the wiring for both the power source and indoor
wiring.
Wire the system according to applicable national / local
codes.
Verify that the wiring connections for the indoor unit match
wire for wire.
(1-1, 2-2, 3-3, Gnd-Gnd). Failure to wire the system correctly
may lead to improper operation or component damage.
Step - 3.4
3.4
Replace the cover plate.
*See Steps 2.11 - 2.13 & 3.2 - 3.4 for connecting the
electrical.
The standard lineset length is 25ft. If the installation length is
different, adjust the refrigerant charge by .2 oz / ft. for the 9K,
12K, 18K, and 24K model. (Illustration 4)
Cut the lineset to length, flare and attach the piping to the
outdoor unit valves.
Torque the fittings to the specifications shown in the torque
chart.
4.1 Step - 4.1
Refrigerant piping connections for the mini-split system are
made utilizing flare connections. Follow standard practices
for creating pipe flares. When cutting and reaming the tubing,
use caution to prevent dirt or debris from entering the tubing.
Remember to place the nut on the pipe before creating the
flare.
Step - 4.2
4.2
To join the lineset piping together, directly align the piping
flare to the fitting on the other pipe, then slide the nut onto
the fitting and tighten. Misalignment may result in a leaking
connection.
Step - 4.3
2.17
Two wrenches are required to join the flare connections, one
standard wrench, and one torque wrench. See Table 1 for the
specific torque per piping diameter.

Step 4 - Interconnecting the Indoor and Outdoor Units

Piping
Step 3.3
CAUTION
Outdoor unit
Outdoor unit
Step 4.1
Half union
Spanner
Torque wrench
Step 4.3
INSTALLATION
Step 3.4
Outdoor unit
Indoor unit
B
B
A
A
Max. Elevation: A Max
= 32ft / 10m (09k / 12k)
= 50ft / 15m (18k / 24k)
In case the height of A is more than
15ft / 5m, an oil trap should be
Oil trap
B
installed every 16-23ft /5-7m
Indoor unit
Max. Length: B Max
A
= 50ft / 15m (09k / 12k)
= 80ft / 25m (18k / 24k)
Illustration 4
Step 4.2
Forced fastening without careful centering may
Flare nut
damage the threads and cause a leakage of gas.
Pipe Diameter(ǿ)
Liquid side6.35mm(1/4") 18N.m/13.3Ft.lbs
Liquid/Gas side9.52mm(3/8") 42 N.m/30.1Ft.lbs
Gas side 12.7mm(1/2") 55N.m/40.6Ft.lbs
Gas side 15.88mm(5/8") 60 N.m/44.3Ft.lbs
Table 1
Indoor unit
Fastening torque
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