R410A DC Inverter VRF V4 Plus Individual Series 50Hz
MCAC-VTSM-2014-04
80
Installation
Besides, CCM03 can also connect indoor units
via the port X Y E of indoor unit
. However, one more group of
wire(X Y E between indoor units) is needed; it is more complex and not suggested. Anyway, the diagram below
shows the connection of signal wire in this case:
15. Running test
15.1 Inspection and confirmation before commissioning
Check and confirm that refrigeration pipe line and communication wire of indoor and outdoor units have
been connected to the same refrigeration system. Otherwise, operation troubles shall happen.
Power voltage is within ±10% rated voltage.
Check and confirm that the power wire and control wire are correctly connected.
Check whether wire controller is properly connected.
Before powering on, confirm there is no short circuit to each line.
Check whether all units have passed nitrogen pressure-keeping test for 24 hours with R410A: 40kg/cm
2
.
Confirm whether the system to debugging has been carried out vacuum drying and packed with refrigeration
as required.
15.2 Preparation before debugging
Calculate the additional refrigerant quantity for each set of unit according to the actual length of liquid pipe.
Keep required refrigerant ready.
Keep system scheme, system piping diagram and control wiring diagram ready.
Record the setting address code on the system scheme.
Turn on power switches of outdoor unit in advance, and keep connected for above 12 hours so that heater
heating up refrigerant oil in compressor.
Turn on gas 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.
Check whether the power phase sequence of outdoor unit is correct.
All dial switch of indoor and outdoor units have been set according to the Technical Requirement of Product.
15.3 Fill the name of connected system
To clearly identify the connected systems among two or more indoor units and outdoor units, select names for
every system and record them on the nameplate on the outdoor electric control box cover.