Midea MIV V4+ Mini Service Manual page 49

DM12-01.01.05en
1.7 Heat-insulation
Procedure:
Refrigerant pipe work
Note: For welding part, flare part and branch pipe, heat-insulation work must be done after finished the pressure test.
1.8 Install outdoor unit
Note:
(1) Gutter must be set around the foundation to drain the condensation water.
(2) When installing outdoor units at the roof, please check the strength of the roof and pay attention not to destroy the
waterproof of the roof.
1.9 Recharge refrigerant
Procedure:
Calculate the added volume according to liquid pipe length
Note: Please calculate the additional amount of refrigerant according to the formula that we supply to you, and the
calculation result must be correct
1.10 Main points of test running and debugging
Please check the following issues before turning on the power:
(1). Vacuum dry:
Make sure the vacuum degree accord with our requirement about 10
(2). Wiring:
Includes the power wiring and communication wiring; Recheck the connection according to our
corresponding wire diagrams. Especially, please remember our communication wire is polar; it means you
must connect the communication wire correspondingly to the terminal block.
(3). Additional charge of refrigerant:
Recheck the calculation formula and recalculate the total recharge volume according to our supplied
formula.
(4). Open the stop-valve of gas and liquid pipe with Allen key; Check leakage of stop-valve with soap
water.
Please confirm whether the outdoor unit has been connected to the power for 12hr before start test
running.
Test running:
Turn on all of the indoor units with cooling mode and set the temperature in 17degree with high fan speed
first, after the system operated, test following operation parameters of the system, including indoor units
and outdoor units parameters.
Installation
Check the heat-insulated part
MIV V4+ Mini DC Inverter R410A (220V, 8 kW)
Pressure test
Recharge refrigerant
-5
.
Heat-insulation work
47