MCAC-VTSM-2016-04
R410A DC Inverter VRF V4 Plus W Series 50Hz
Installation 193
5. Trial run
5.1 Inspection and confirmation before commissioning
1) Check and confirm that refrigeration pipe line and communication wire with indoor and main unit have been
connected to the same refrigeration system. Otherwise, operation troubles shall happen.
2) Power voltage is within ±10% of rated voltage.
3) Check and confirm that the power wire and control wire are correctly connected.
4) Before powering on, confirm there is no short circuit to each line.
5) Check whether all units have passed nitrogen pressure-keeping test for 24 hours with R410A: 40kg/cm2 .
6) Confirm whether the system to debugging has been carried out vacuum drying and packed with refrigeration
as required.
7) Make sure all the water pipelines are correct, including the installation directions of water filter and water
flow switch.
8) Check whether the water filter has been blocked, and clean the filter screen. If it is seriously blocked, then it
should be checked whether the water quality has meet the requirements.
9) Open the gate valve, make sure the double-pipe heat exchanger have been filled with circulating water, and
open the water pump and air discharge valve, after make sure the air in the water pipelines and unit has been
drain out and then close the air discharge valve.
10) Check whether the pressure meters in the water inlet and water return pips of the unit, thermometer, water
flow switch etc. work normally, and make sure the water pipelines system operate normal, and the water flow is
suitable.
5.2 Preparation before debugging
1) Calculating the additional refrigerant quantity for each set of unit according to the actual length of liquid pipe.
2) Keep required refrigerant ready.
3) Keep system plan, system piping diagram and control wiring diagram ready.
4) Record the setting address code on the system plan.
5) Turn on power switches main unit in advance, and keep connected for above 12 hours so that heater
heating up refrigerant oil in compressor.
6) Turn on air pipe stop valve, liquid pipe stop valve, oil balance valve and air balance valve totally. If the above
valves do not be turned on totally, the unit should ¬be damaged.
7) Check whether the power phase sequence of main unit is correct.
8) All dial switch to indoor and main unit have been set according to the Technical Requirement of Product.
5.3 Fill the name of connected system
To clearly identify the connected systems between two or more indoor units and main unit, select names for
every system and record them on the nameplate on the outdoor electric control box cover.