Mitsubishi Electric MXZ-3B24NA Notice D'installation page 7

4-2. GAS CHARGE
Perform gas charge to unit.
1) Connect gas cylinder to the service port of stop valve.
2) Perform air purge of the pipe (or hose) coming from refrigerant gas cylinder.
3) Replenish specified amount of the refrigerant, while operating the air conditioner for cooling.
Note:
In case of adding refrigerant, comply with the quantity specified for the refrigerating cycle.
CAUTION:
When charging the refrigerant system with additional refrigerant, be sure to use liquid refriger-
ant. Adding gas refrigerant may change the composition of the refrigerant in the system and
affect normal operation of the air conditioner. Also, charge the liquid refrigerant slowly, otherwise
the compressor will be locked.
To maintain the high pressure of the gas cylinder, warm the gas cylinder with warm water (under
40°C (140°F)) during cold season. But never use naked fire or steam.
4-3. TEST RUN
Test runs of the indoor units should be performed individually. See the installation manual
coming with the indoor unit, and make sure all the units operate properly.
* If the test run with all the units is performed at once, possible erroneous connections of the
refrigerant pipes and the indoor/outdoor unit connecting wires cannot be detected. Thus, be
sure to perform the test run one by one.
About the restart protective mechanism
Once the compressor stops, the restart preventive device operates so the compressor will not
operate for 3 minutes to protect the air conditioner.
Wiring/piping correction function
This unit has a wiring/piping correction function which corrects wiring and piping combination.
When there is possibility of incorrect wiring and piping combination, and confirming the combi-
nation is difficult, use this function to detect and correct the combination by following the proce-
dures below.
Make sure that the following is done.
¢ Power is supplied to the unit.
° Stop valves are open.
Note:
During detection, the operation of the indoor unit is controlled by the outdoor unit. During detec-
tion, the indoor unit automatically stops operation. This is not a malfunction.
Procedure
Press the piping/wiring correction switch (SW871) 1 minute or more after turning on the power
supply.
* Correction completes in 10 to 15 minutes. When the correction is completed, its result is
shown by LED indication. Details are described in the following table.
* To cancel this function during its operation, press the piping/wiring correction switch (SW871)
again.
¢ When the correction completed without error, do not press the piping/wiring correction switch
(SW871) again.
When the result was "cannot be corrected", press the piping/wiring correction switch (SW871)
again to cancel this function. Then, confirm the wiring and piping combination in a conventional
manner by operating the indoor units one by one.
* The operation is done while the power is supplied. Make sure not to contact parts other than
the switch, including the P.C. board. This may cause electric shock or burn by hot parts and
live parts around the switch. Contacting the live parts may cause P.C. board damage.
* To prevent electronic control P.C. board damage, make sure to perform static elimination be-
fore operating this function.
¢ This function does not operate when the outside temperature is 0°C (32°F) or below.
4-4. EXPLANATION TO THE USER
Stop valve
Liquid
pipe
Indoor Outdoor
unit unit
Stop vaive with
' Gas
service port *
> pipe
<>
Refrigerant gas D unit is for
cylinder
,
AB36NA only
operating valve Gauge manifold
(for R410A) valve (for R410A)
LED indication during detection:
Refrigerant (iquid)
Charge hose
(for R410A)
Electronic scale for refrigerant charging
LED
1 (Red) 2 (Yellow) 3 (Green)
Lighted Lighted Blinking
Result of piping/wiring correction function
LED Result
1 (Red) | 2 (Yellow) | 3 (Green) eu
: : : C leted
Lighted |Notlighted| Lighted (Corrected successfully)
Blinking Blinking Blinking |Cannot be corrected
Other indications
Refer to "SAFETY PRE-
CAUTIONS WHEN LED
FLASHES" located behind
the service panel.
¢ Using the OPERATING INSTRUCTIONS, explain to the user how to use the air conditioner (how to use the remote controller, how to remove the air filters, how to
remove or put the remote controller in the remote controller holder, how to clean, precautions for operation, etc.).
* Recommend the user to read the OPERATING INSTRUCTIONS carefully.
En-6