Hitachi UTOPIA RAS-4HVRP2E - Preliminary Checks

7 Commissioning
Preliminary checks
SMGB0136 rev.0 - 07/2021
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7.1 Preliminary checks
The test run must be performed according to the instructions in this chapter.
! DANGER
Do not use the system until all the checkpoints have been veried.
• Make sure that the refrigerant pipes and the communication cables between the outdoor and indoor units are
connected to the same refrigerant cycle. Failure to do so could lead to abnormal operations or a serious accident.
Check that the setting of the refrigerant cycle DSW (on outdoor units, on indoor units) and of the unit number (DSW4
and RSW1 for R32 or DSW6 and RSW1 for R410A) of the indoor units is suitable for the system. Check whether the
DSWsettingspeciedontheprintedcircuitoftheindoorandoutdoorunitsiscorrect.Payspecialattentiontothe
outdoor unit number, the refrigerant cycle number and the terminal resistance.
• Makesurethattheelectricresistanceisgreaterthan1MΩ;todothis,measuretheresistancebetweentheearth
and the terminal of the electrical components. If not, do not use the system until the electrical leak has been detected
andrepaired.Donotapplyvoltagetothecommunicationterminals(Outdoorunitof4-6HP:TB2;terminals1,2,3,4/
Outdoorunitof3HP:TB1;terminals1,2/Indoorunit:TB2;terminals1,2,A,B/CH-Box:TB2;terminals1,2,3,4).
• Check that all the cables, L1, L2, L3 and N (R, S and T) in case of 3 phases or L and N in case of 1 phase models
are correctly connected to the power supply line. If they are not correctly connected, the unit will not work and the
remote control will indicate alarm code “05”. When this happens, check and change the phase of the power supply
line according to the sheet on the back of the service cover.
! CAUTION
Make sure that the unit’s main power supply line switch has been on for more than 12 hours, to heat the compressor oil with the heating
resistors.
? NOTE
• Make sure the electric components in the installation (earth leakage breaker, circuit breaker, cables, connectors and cable terminals)
have been selected correctly in line with the electrical data given in this Manual. Also ensure that these components meet the local
and national codes.
• Use shielded cables (> 0.75 mm
2
) for the communication installation wiring to avoid electromagnetic noise (the shielded cable must
have a total length shorter than 1000 m, and its size must comply with local codes).
• For 3 phases models, check the connection of the power supply wiring terminals (terminals “L1 to L1 (R)”, “L2 to L2 (S)”, “L3 to L3 (T)”
and “N to N”). Supply voltage 3N ~ 400V 50Hz. If it is different, some components could be damaged.
• For 1 phase models, check the connection of the power supply wirinf terminals (terminals “L1 to L1” and “N to N”). Supply voltage 3N
~ 230V 50Hz. If it is different, some components could be damaged.