Hitachi UTOPIA RAS-4HVRP2E - Checking at Test Run

7 Commissioning
Checking at test run
SMGB0136 rev.0 - 07/2021
150
7.5 Checking at test run
1 Indoor and outdoor fan.
Checkthattheindoorandoutdoorfanrotateproperlyandtheairowissmooth.
2 Power supply voltage.
Check the power supply. If the power supply is abnormal, contact the electric power company.
Usually,voltagedropwilloccurwhenstartingtheoperationasshowninthegure(V2).
In order to protect the device, comply with the following normal
range of the power supply voltage.
Normal power supply voltage range
• Supplyvoltage:ratedvoltage≤±10%
• Startingvoltage(V
2
):ratedvoltage≥-15%
• Operatingvoltage(V
3
):ratedvoltage≤±10%
• Imbalancevoltagebetweenphase:≤3%
InitialVoltage
OperatingVoltage
StartingVoltage
3 Normal operating pressure.
Normal operating suction pressure is 0.2 at 1.1 MPa and the normal operating discharge pressure is 1.0 at 3.5 MPa
when the refrigerant charge quantity is correct. Check the operating pressure in the test run mode.
4 High pressure switch.
Check the operating pressure of the high pressure switch in the following table.
Refrigerant Operating pressure
R32
4.15 MPa
R410A
5 High pressure increase retry (protection control)
a. The high pressure will increase when the following procedure is performed.
Cover the air inlet of the outdoor unit during the cooling
operation
Cover the air inlet of the indoor unit during the heating
operation.