Mitsubishi Electric S Series Manual page 117

S series
6. Electrical work
6.2. Field electrical wiring
Outdoor unit model
Outdoor unit power supply
Outdoor unit input capacity
Main switch (Breaker)
Outdoor unit power supply
Outdoor unit power supply earth
Indoor unit-Outdoor unit
Indoor unit-Outdoor unit earth
Outdoor unit L-N
Indoor unit-Outdoor unit S1-S2
Indoor unit-Outdoor unit S2-S3
*1. A breaker with at least 3 mm contact separation in each poles shall be provided. Use earth leakage breaker (NV).
*2. The figures are NOT always against the ground.
S3 terminal has DC 24 V against S2 terminal. However between S3 and S1, these terminals are NOT electrically insulated by the transformer or other device.
Notes: 1. Wiring size must comply with the applicable local and national code.
2. Power supply cords and Indoor/Outdoor unit connecting cords shall not be lighter than polychloroprene sheathed flexible cord. (Design 60245 IEC 57)
3. Install an earth longer than other cables.
Warning:
There is high voltage potential on the S3 terminal caused by electrical circuit design that has no electrical insulation between power line and communication
signal line. Therefore, please turn off the main power supply when servicing. And do not touch the S1, S2, S3 terminals when the power is energized. If isolator
should be used between indoor unit and outdoor unit, please use 3-pole type.
7. Maintenance
Indoor unit
Union
Liquid pipe
Gas pipe
Stop valve
Outdoor unit
Refrigerant gas cylinder operating valve
Fig. 7-1
*1
*2
*2
*2
230V
Single phase
Isolator
S1
Outdoor
S2
Unit
S3
Refrigerant gas cylinder for R410A with
siphon
Refrigerant (liquid)
Electronic scale for refrigerant charging
Charge hose (for R410A)
Gauge manifold valve (for R410A)
Service port
SUZ-KA25/KA35
~/N (single), 50 Hz,
230 V
10 A
2 Min. 1.5
1 Min. 1.5
3 1.5 (Polar)
1 Min. 1.5
AC 230 V
AC 230 V
DC 12 V ~ DC 24 V
3 poles isolator
S1
S2
S3
7.1. Gas charge (Fig. 7-1)
1. Connect gas cylinder to the service port of stop valve (3-way).
2. Execute air purge of the pipe (or hose) coming from refrigerant gas cylinder.
3. Replenish specified amount of refrigerant, while running the air conditioner
for cooling.
Note:
In case of adding refrigerant, comply with the quantity specified for the refrig-
erating cycle.
Caution:
• Do not discharge the refrigerant into the atmosphere.
Take care not to discharge refrigerant into the atmosphere during installa-
tion, reinstallation, or repairs to the refrigerant circuit.
• For additional charging, charge the refrigerant from liquid phase of the gas
cylinder.
If the refrigerant is charged from the gas phase, composition change may
occur in the refrigerant inside the cylinder and the outdoor unit. In this case,
ability of the refrigerant cycle decreases and normal operation can become
impossible. However, charging the liquid refrigerant all at once may cause
the compressor to be locked. Thus, charge the refrigerant slowly.
To maintain the high pressure of the gas cylinder, warm the gas cylinder with warm
water (under 40 ) during cold season. But never use naked fire or steam.
OUTDOOR UNIT
SUZ-KA50/KA60/KA71
~/N (single), 50 Hz,
230 V
20 A
2 Min. 2.5
1 Min. 2.5
3 1.5 (Polar)
1 Min. 1.5
AC 230 V
AC 230 V
DC 12 V ~ DC 24 V
Indoor
Unit
B-117