7
S1
S2
S3
S1
S2
S3
5. Electrical work
6. Maintenance
6.1. Gas charge (Fig. 6-1)
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 condi-
tioner 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 refrigerating cycle decreases or normal operation can
be 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°C) during cold season. But never use naked fire or steam.
5.2. Field electrical wiring
Outdoor unit model
SUZ-SA71VA
Outdoor unit power supply
~/N (single), 50 Hz, 30 V
Outdoor unit input capacity Main switch (Breaker)
*1
0 A
Wiring
Wire No. ×
size (mm
)
Outdoor unit power supply
× Min. .5
Outdoor unit power supply earth
1 × Min. .5
Indoor unit-Outdoor unit
3 × 1.5 (Polar)
Indoor unit-Outdoor unit earth
1 × Min. 1.5
Circuit
rating
Outdoor unit L-N
*
AC 30 V
Indoor unit-Outdoor unit S1-S
*
AC 30 V
Indoor unit-Outdoor unit S-S3
*
DC 1 V ~ DC 4 V
*1. A breaker with at least 3 mm contact separation in each poles shall be provided. Use earth leakage breaker (NV).
Make sure that the current leakage breaker is one compatible with higher harmonics.
Always use a current leakage breaker that is compatible with higher harmonics as this unit is equipped with an inverter.
The use of an inadequate breaker can cause the incorrect operation of inverter.
*2. The figures are NOT always against the ground.
S3 terminal has DC 4 V against S 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.
Outdoor Unit
3 poles isolator
30 V
Single phase
Isolator
Indoor Unit
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-poles type.
A
Indoor unit
H
Refrigerant gas cylinder for R410A with siphon
B
Union
I
Refrigerant (liquid)
C
Liquid pipe
J
Electronic scale for refrigerant charging
D
Gas pipe
K
Charge hose (for R410A)
E
Stop valve
L
Gauge manifold valve (for R410A)
F
Outdoor unit
M
Service port
G
Refrigerant gas cylinder
operating valve
Never splice the power cable or the indoor-outdoor connection cable, otherwise it may result in a smoke, a fire or communication failure.
Fig. 6-1
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