Panasonic U-4LE1E5, Руководство по обслуживанию

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Mini VRF SYSTEM
Control Functions
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11-2. Inverter Compressor
11-3. CT Circuit Detection Failure
12. Pressure Sensor Failure
This system includes a high-pressure sensor.
12-1. High-Pressure Sensor Failure
Connector disconnection or displacement failure is judged according to the relationship between the high-pressure
sensor temperature, which is detected by the high-pressure sensor, and the various temperature thermistors.
However, if the pressure rises suddenly, a high-pressure sensor failure warning may be judged before the high-
pressure sensor activates. Therefore check the following before determining that a pressure sensor failure has
occurred:
Has the service valve been left open?
Is there a blocked circuit?
Is there leakage of refrigerant into stopped outdoor units?
Also check the difference between the high-pressure pressure as measured by a manifold gauge and the pressure
as detected by the pressure sensor.
13. 4-Way Valve Failure [L18]
When a 4-way valve coil failure, coil disconnection or similar failure occurs, a judgment is made automatically from
the operating conditions, and an alarm is output.
Alarm Description
P16
Occurs when overcurrent (32.5 A) is detected during normal
operation.
P29
Occurs when a missing phase or overcurrent (48 A) is detected
when the inverter compressor starts.
H31
Occurs when the HIC detects overcurrent (75 A), and when an
abnormal temperature (150°C) is reached.
The inverter current values include primary current and secondary current.
Alarm judgment uses both of these current values. However, in general the secondary
current is higher than the primary current.
Alarm Description
H03
Occurs when an open circuit is detected in the inverter
compressor CT circuit.
Alarm Description
F16 High-pressure sensor failure
Compressor 1
(inverter compressor)
If the operating frequency of the inverter compressor is low, the current value is also low.
As a result, this alarm is detected only when the compressor is stopped.
11. Current Protection
12. Pressure Sensor Failure
13. 4-Way Valve Failure [L18]
SM830195-01̲Mini VRF SYS.indb 19 SM830195-01̲Mini VRF SYS.indb 19 2011/12/20 16:31:05 2011/12/20 16:31:05