6 720 874 421 (2017/04) ZA
Mini VRF Heat Pump Outdoor Unit
12 | TEST RUNNING
Table 5-3
SW3 (SW-1)
1
ON
Obtain network address automatically
OFF
Obtain network address manually
2
ON
Delete indoor unit network address
OFF
/
•
12–16: SW4/SW7 definition: Auto addressing dial
Single-Phase
Three-Phase
ON
SW4
1 2 3
ON
SW7
1 2
Table 5-4
SW4
Single-Phase
SW7
Three-Phase
1
ON
Obtain network address automatically
OFF
Obtain network address manually
2
ON
Delete indoor unit network address
OFF
/
6. TEST RUNNING
CAUTION
•
Ensure power to the outdoor unit has been turned on for at least
12 hours prior to start up.
•
Ensure isolation valves have been opened prior to running the
unit.
7. PRECAUTIONS ON REFRIGERANT
LEAKAGE
This air conditioning unit uses R410a as a refrigerant which is non
flammable. The room for the air conditioning unit should big enough so that
any refrigerant leakage is unable to reach critical thickness.
•
Critical thickness------maximum exposure of refrigerant without any
harm to person.
•
Refrigerant critical thickness: 0.44 [kg/m
3
] for R410A.
Confirm the critical thickness using the following steps, and take necessary
actions.
1 Calculate the sum of the charge volume (A[kg]) Total Refrigerant
volume of 10HP=factory refrigerant superaddition
2 Calculate the indoor cubage (B[m ]) (as the minimum cubage.
Calculate the refrigerant thickness
A[kg]
≤ critical thickness
B[m
3
]
Counter measure against over high thickness
1 Install a mechanical ventilator to reduce the refrigerant thickness
under a critical level. (ventilate regularly)
2 Install leak alarm facility related to a mechanical ventilator if you can
not regularly ventilate.
b. Leak alarm related to mechanical ventilator
A. Ventilation
Indoor unit
Outdoor unit
Indoor unit
Room full of leak refrigerant
(All refrigerant has run up)
Fig. 7-1
