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8. The attentive matters in installation of air suction and discharging duct
Recommend to use anti-frost and sound-absorbing duct. (locally bought)
The duct installation work should be finished before the fitment of ceiling.
The duct must be heat insulated.
The specific air-discharging outlet should be installed at the place where the
airflow can be reasonably distributed.
The surface should leave a checking meatus for checking and maintenance.
Air
Air
Duct
Special air discharging outlet
Use screw bolt to fix
9. The examples of improper installation
Do not use air in duct and take the ceiling inner side instead. The result is
because of the irregular outer air mass, strong wind and sunshine, the humidity
is increased.
There may be water drop on the outside of duct. For cement and other new
constructions, even if not taking ceiling inner side as duct, the humidity will
also be so high. At this time, use glass fiber to perform heat preservation to
the whole. (use iron net to bind the glass fiber)
Maybe exceeding the unit operation limit (for example: when indoor dry bulb
temperature is 35 C, wet bulb temperature 24 C), it may lead to overload of
compressor.
Affected by the capacity of air discharging fan, the strong wind in the outer
duct and wind direction, when unit air sending volume exceeds the limit, the
discharged water of heat exchanger will overflow, leading to water leakage.
Air discharging fan
Improper example
Installation Precedure
18
11. Refrigerant pipe
The air side pipe, liquid side pipe must be faithfully heat insulated, if no heat insulation, it may cause water leakage.
The outdoor unit has been charged with refrigerant.
When connect the pipe to the unit or dismantling the pipe from the unit, please follow the figure shown, use spanner
and torque spanner together.
When connect cone nut, the inner side and outside of cone nut should paste with refrigerant oil. Use hand to twist 3-4
rings, then fasten with spanner.
Referring to Table I to confirm the fasten torque. (too tight may damage nut leading to leakage)
Check if the connection pipe leaks, then do heat insulation treatment, as below figure shown.
Only use seal cushion to bind the joint part of air pipe and heat insulation parts.
Paste the refrigerant oil here
Torque spanner
Spanner
Pipe joint
Cone nut
Middle size seal cushion (accessory)
(Use seal cushion to
bind the pipe joint)
Clamp
Heat insulation (accessory)
(for liquid pipe)
(for gas pipe)
Heat insulation (accessory)
Gas pipe
Liquid pipe
Liquid pipe
Gas pipe
Electric box
Upper
Air inlet
Air outlet
Down side
Drain hose connection mouth
VP25 PVC pipe
310
30
530
80 510
1.2~2.050 N.m
Specification
of pipe
Tighten torque
Cone
Cone
dimension
A (mm)
12.7mm
R0.4~0.8
A
90 0.5
45 2
Table I
Indoor Unit