SM-18003
3-49
TROUBLESHOOTING
3.4.2 Test Run from Outdoor Unit Side
Refer to the Service Manual for Outdoor Unit.
3.4.3 Checking the Test Run
(1) Indoor and Outdoor Fan
Check that the indoor fan and outdoor fan
rotate correctly and the airow 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 (V
2
).
In order to protect the device, comply with the following normal range of the power supply voltage.
<Normal Range of Power Supply Voltage>
• Supply Voltage: Rated Voltage < +10% Operating Voltage (V
3
): Rated Voltage < +10%
• Starting Voltage (V
2
): Rated Voltage > -15% Voltage Imbalance between Phase: < 3%
(3) Normal Operating Pressure
Normal operating suction pressure is 29 to 159.5 psi (0.2 to 1.1 MPa) and normal operating discharge
pressure is 145 to 507.6 psi (1.0 to 3.5 MPa) when the refrigerant charge quantity is correct. Check
the operation pressure in the test run mode.
(4) High Pressure Switch
Check the operation pressure of the high pressure switch in the table below.
(5) High Pressure Increase Retry (Protection Control)
(a) High pressure will increase when one of the following procedures is performed.
Refrigerant Operation Pressure
R410A 601 psi (4.15MPa)
Initial Voltage
(V1)
Starting Voltage
(V
2)
Operating Voltage
(V
3)
Cover the air inlet of outdoor unit
during cooling operation.
Cover the air inlet of indoor unit
during heating operation.
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