Leakage Detection; Heat Insulation - Midea M-thermal Split MHA-V4W/D2N8 Installation And Owner's Manual

● Please pay attention to avoid the components where it is connecting to the connecting pipes.
To prevent the refrigerant piping from oxidizing inside when welding, it is necessary to charge nitrogen, or oxide
●
will chock the circulation system.
● Back out pipe:Undersurface outlet pipe: the knock out should from inside to outside, and then piping and wiring
through this.Pay attention to the piping, the fat connecting pipe should out from the largest hole, otherwise the pipes
will be rubbed. Please do the moth proofing for the knocked out hole, to avoid the pest processing into and destroy
the components.Please wipe off the piping support rubber blanket beside the inner outlet pipe cover of the machine
while back side getting out pipes.

7.2 Leakage Detection

Use soap water or leakage detector to check every joint whether leak or not (Refer to Fig.7-2 ).Note:
A is high pressure side stop valve
B is low pressure side stop valve
C and D is connecting pipes interface of indoor and outdoor units
A

7.3 Heat Insulation

Do the heat insulation to the pipes of gas side and liquid side separately. The temperature of the pipes of gas side and liquid side when
cooling, for avoiding condensation please do the heat insulation fully.
1) The gas side pipe should use closed cell foamed insulation material, which the fire-retardant is B1 grade and the heat resistance
over 120 ℃.
2) When the external diameter of copper pipe≤Φ12.7mm, the thickness of the insulating layer at least more than 15mm; When the
external diameter of copper pipe≥Φ15.9mm, the thickness of the insulating layer at least more than 20mm.
3) Please use attached heat-insulating materials do the heat insulation without clearance for the connecting parts of the indoor unit pipes.
CAUTION
Check point of indoor unit
B
Check point of outdoor unit
The unit body
Affiliated heat pump belt
Fig.7-3
12
Fig.7-2
Cut from upward
Site pipe side
D C