Step 4 - Leak Test And Evacuation - Haier 2U18MS2VHB Installation Manual

Piping Connection
Step - 3.1
3.1
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 - 3.2
3.2
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 - 3.3
3.3
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 3.1
Leak Test
Hazard of Explosion! Never use an open flame to detect
gas leaks. Explosive conditions may occur. Use a leak test
solution or other approved methods for leak testing. Failure
to follow recommended safe leak test procedures could
result In death or serious injury or equipment or property
damage.
Use only dry nitrogen with a pressure regulator for
pressurizing unit. Do not use acetylene, oxygen or
compressed air or mixtures containing them for pressure
testing. Do not use mixtures of a hydrogen containing
refrigerant and air above atmospheric pressure for pressure
testing as they may become flammable and could result in
an explosion. Refrigerant, when used as a trace gas should
only be mixed with dry nitrogen for pressurizing units. Failure
to follow these recommendations could result in death or
serious injury or equipment or property damage.
PAGE 8
Step 3 - Refrigerant Line Connections

Step 4 - Leak Test and Evacuation

Using a tank of nitrogen with attached regulator, charge
the system with 150 PSIG of dry nitrogen. Use adapter AD-
87 (field supplied) to connect to the valve. Check for leaks
at the flare fittings using soap bubbles or other detection
methods. If a leak is detected, repair and recheck. If no leaks
are detected, proceed to evacuate the system.
INSTALLATION
Step 3.2
Step 3.3
Table 1
Forced fastening without careful centering may
Half union
Flare nut
damage the threads and cause a leakage of gas.
Liquid side6.35mm(1/4")
Liquid/Gas side9.52mm(3/8") 42 N.m/30.1Ft.lbs
Gas side 12.7mm(1/2")
Spanner Torque wrench
Gas side 15.88mm(5/8")
Step - 4.1
4.1
Step 4.1
Pipe Diameter(ǿ) Fastening torque
18N.m/13.3Ft.lbs
55N.m/40.6Ft.lbs
60 N.m/44.3Ft.lbs