Mitsubishi Electric CMB-WM350F-AA Installation Manual page 22

2. Air vent operation
[When an outdoor unit is connected, and refrigerant piping work, air-tightness test of refrigerant piping, evacuation of refrigerant
circuits, and refrigerant charging have been completed]
1. Turn on DIP SW002-3 of the Main-HBC.
2. The LED on the control board indicates "Air1," "Air2," "Air3," "Air 4," and "AirE" in order, and the pump will stop after a while.
Control board
(LED, DIP SW positions)
3.
4. Close all manual air vent valves.
Stop the water supply.
[When no outdoor units are connected, or refrigerant piping work, air-tightness test of refrigerant piping, evacuation of refrigerant
circuits, and refrigerant charging have not been completed (when performing air vent operation for the water circuits only)]
The following must be completed before performing air vent operation.
• Assign M-NET addresses to the HBC and the indoor units.
•
•
* While the air vent operation is being performed, no other functions of the Maintenance Tool are available for use.
1. Follow the procedures below after connecting the MN converter and starting up the Maintenance Tool. (Manuals are accessible from the
Maintenance Tool.)
<Air vent operation procedure (without connection to an outdoor unit)>
1
commissioning.
2
Next to proceed.
*
3 After the units are searched for, a sign that indicates the completion
of preparation will appear. Turn on DIP SW002-3 of the Main-HBC to
start the operation.
2. The LED on the control board will indicate "Air1," "Air2," "Air3" and "AirE" in order, and the pump will stop after a while.
The progress of the air vent operation will appear on the service LED of the Main-HBC and on the Maintenance Tool.
3.
4. Close all manual air vent valves.
Stop the water supply.
* Before setting the DIP SW, make sure that the service LED of the Main-HBC is not indicating any error.
* Debris removal operation or air vent operation cannot be executed from the Maintenance Tool.
* An air vent operation using warm water cannot be performed to remove dissolved oxygen (Air4) from the water circuit without connection to an
outdoor unit.
After connecting the outdoor unit (refrigerant circuit), perform an air vent operation again to remove all air from the circuit.
Any air left in the water circuit may damage the pump.
(Air4 operation alone can be performed by turning on DIP SW001-10 after connecting the outdoor unit (refrigerant circuit).)
22
LED position
DIP SW position
Total estimated time for air vent operation
600
500
400
300
200
STEP4 included
100
0
0 5 10 15 20 25
Total number of branch
Time required for air vent operation
Maintenance Tool window
(Air vent operation without connection to an outdoor unit)
STEP4 not included
30 35 40 45 50 55