Mitsubishi Electric CITY MULTI CMB-WP108NU-AA Manual De Instalación página 14

8.3. Instructions for the air vent operation
This operation removes the air that remains after water is supplied to the water circuit.
Perform this operation after completion of water- and refrigerant-piping work, air tightness test, evacuation of refrigerant circuits, and refrigerant charging (and
debris removal, if performed).
* When main-HBC controllers are connected in parallel, please do not operate them at the same time.
1. Preparation for the air vent operation
1. Set DIP SW 5-1 (valve opening when stopped), DIP SW 5-2 (nullification of drain over-flow error for 9 hours) from off to on.
HBC controller
2. Turn on the breaker, and then open the air vent valves on the HBC controller and the indoor units.
Refer to the Installation Manual for the location of air vent valves.
(If there are air vent valves on the field-installed pipes, open the valves as well.)
3. Supply water from the suction pipe on the HBC controller.
4. Check that water comes from each air vent valve, and perform the air vent operation.
2. Air vent operation
1. Set DIPSW4-3 from OFF to ON.
2. The LED will indicate "Air1" "Air2" "Air3" "Air4" and "AirE" in order over a period of up to 140~380 minutes, and after 140~380 minutes have passed, the water pump will
stop.
3. Set the dipswitch 4-3 from ON to OFF.
4. Close the all air vent valves.
5. Stop the water supply.
3. Checking for the presence of residual air
1. Set DIPSW4-5 from OFF to ON, and operate the water pump.
2. If there is residual air in the circuit, it will be noisy. Check for water leaks from the pipe, and then, perform the air vent operation again.
Flowchart for air vent operation (DIPSW4-3 is ON.)
Step 1 Intermittent operation of water pump (20 min)
Step 2
Operation of all indoor units (20 min)
Step 3 Operation of individual indoor unit (10 min per one branch)
Step 4 Heating operation of all indoor units (20 min)
(1) The operation can be forced to stop by setting DIPSW4-4 from OFF to ON.
(2) If it is found during any step that air ventilation has not been completed to the desired degree, go back to Step 2-1.
(3) If Error appears on the LED, turn off the breaker, turn it back on, and start over at step 2-1.
4. End processing
Set the dipswitches 5-1 and 5-2 to OFF after completion of air vent operation.
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Indoor unit (Example: PEFY-WL-NMAU-A)
Install a non-return valve to prevent water in the water circuit flooding back to
the water supply pipe, or remove the water supply hose after the air vent
operation.
LED and DIPSW positions
↓
↓
↓
The operation is performed while air is discharged from the
water pipe. [Air1]
The residual air will be roughly removed by operating all
indoor units. [Air2]
The residual air will be removed by operating indoor units
for each branch. [Air3]
The saturated air in the circulating water will be removed by
performing heating operation for all indoor units and raising
the temperature of the circulating water. [Air4 to AirE]
• Perform this
process only when
the outdoor
temperature is
lower than 25°C.