Haier MVHP036MV2AA Installation Manual page 12

Installation instruction
Note:
1. When connecting the pipe to the outdoor unit, please pay attention to the outdoor pipe dimension.
2. When changing the diameter between pipes and between the units, please change on the branch pipe side.
3. Be sure to blow nitrogen when welding. If not, oxides will be produced and cause heavy damage. Take precautions to
prevent water and dust from getting into the pipe.
Adhesive side
Insulation:
• Gas pipe and liquid pipe should be insulated separately.
• The insulation material for gas pipe should be rated for temperatures over
248°F (120°C). The liquid pipe should be for over 158°F (70°C).
• The insulation should be over 0.39in.(10mm) thick, when the ambient
temp. is 86°F (30°C)When the relative humidity is over Liquid pipe 80%,
the insulation thickness should be over 0.59in. (15mm).
• The material should be snug against the pipe without a gap,
then be wrapped with adhesive tape. The connection wire can
not be wrapped with the insulation material and should be at
least 7.87in.(20cm) from the insulation.
Secure refrigerant piping
• During operation, the pipe will vibrate, expand or shrink. If not being secured, the refrigerant will focus on one part and
cause the pipe to break.
• To prevent stressing the pipe, secure the pipe every 6.56-9.84ft.(2-3m).
Pipe installation
When doing the piping connection, please do the following:
• Be careful not to damage any parts or pipes while connecting to the unit.
• Close the valves fully when connecting the pipes
• Protect the pipe from getting water or other impurities in them (welding after being laid down, or being sealed with
adhesive tape).
• Use large diameter bends when possible(over 4 times of the pipe diameter).
• The connection between outdoor liquid pipe and the distributing pipe is flared type. Please flare the pipe with a tool used
with R410A after installing the flare nut. If the pipe length has been adjusted with the copper pipe gauge, you can use
the original tool to flare the pipe.
• The oil is ester oil, not the mineral oil, since the unit uses R410A.
• When connecting the pipe, fasten the pipes using a spanner. The torque refers to the former info.
Expanding pipe: A(in.(mm))
• The outdoor gas pipe and the refrigerant distributing pipe, as well the refrigerant distributing pipe and the branch pipe
should be welded with hard solder.
Prepare on field
Pipe outer
A
diameter
Ø1/4(6.35) 0.36(9.1)
Ø3/8"(9.52) 0.52(13.2)
Ø1/2"(12.7) 0.65(16.6)
Ø5/8"(15.88) 0.78(19.7)
Seal the connection and wrap the
heat insulator with adhesive tape
Liquid pipe
Projecting length of pipe to be expanded: B(mm)
Pipe outer diameter
Ø1/4(6.35)
Ø3/8"(9.52)
Ø1/2"(12.7)
Ø5/8"(15.88)
10
Cut off pipe with the cutter
Cut off at the middle
Connection wire
over 7.87in.(20cm)
Adhesive tape
Gas pipe
Heat insulator
When it is hard pipe
Special tool The former
for R410A
0-1/51" 1/25"-1/17"
(0-0.5) (1.0-1.5)
tool