Midea MDV-V80W/DN1 User Manual

MCAC-VTSM-2013-12 R410a Full DC Inverter Mini VRF
Installation 83
4.4 Remove Dirt or Water in the Piping
Make sure there is no any dirt or water before connecting the piping to the outdoor units.
Wash the piping with high pressure nitrogen, never use refrigerant of outdoor unit.
4.5 Airtight Test
Charge pressured nitrogen after connecting indoor/outdoor unit piping to do airtight test.
Cautions:
1. Pressured nitrogen [4.3MPa (44kg/cm
3
) for R410A] should be used in the airtight test.
2. Tighten high pressure/low pressure valves before applying pressured nitrogen.
3. Apply pressure from air vent mouth on the high pressure/low pressure valves.
4. The high pressure/low pressure valves are closed when applying pressured nitrogen.
5. The airtight test should never be used any oxygen, flammable gas or poisonous gas.
4.6 Vacuum
Using vacuum pump to do the vacuum and never using refrigerant to expel the air.
Vacuum should be done from both liquid side and gas side simultaneously.
4.7 Additional refrigerant charge
Calculate the added refrigerant according to the diameter and the length of the liquid side pipe of the outdoor unit/indoor unit
connection.
Liquid Side Piping Diameter
Refrigerant to be Added Perimeter Piping
Φ6.4
0.023kg
Φ9.53
0.060kg
Φ12.7
0.120kg
Φ15.9
0.180kg
Φ19.1
0.270kg
Φ22.2
0.380kg
Note: Additional refrigerant volume of branch pipe is 0.1kg per item (Consider the liquid side of divergent pipe only)
4.8 Leak detection
Use soap water or leak detector to check every joint whether leaks or not.
Note: A is low pressure side stop valve.
B is high pressure side stop valve.
C and D are connecting pipes interface of indoor and outdoor units.
4.9 Heat insulation
Do the heat insulation to the pipes of air side and liquid side separately. The temperature of the pipes of air side and liquid side when
cooling, for avoiding condensation please do the heat insulation fully.
 The air side pipe should use closed cell foamed insulation material, which the fire-retardant is B1 grade and the heat resistance
over 120°C.
 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.
 Please use attached heat-insulating materials to do the heat insulation without clearance for the connecting parts of the indoor
unit pipes.
Check point of outdoor unit
Check point of indoor unit
D
A
B
C

Midea MDV-V80W/DN1 Specifications

General

Brand	Midea
Model	MDV-V80W/DN1
Category	Air Conditioner
Language	English