Sanyo CHDX07263, CHDXR07263, CHDXR09663, CHDX09663 service manual Current Protection

14. Current Protection

(1) Fan motor

Alarm	Description
P22	Occurs when the fan motor detects over current, or when the motor is locked and
	does not turn.

W-2WAY ECO-i SYSTEM Control Functions

(2) Inverter compressor

1

Alarm	Description
P16	Occurs during ordinary operation when overcurrent (27 A) is detected.
P26	Occurs under the same conditions as P16 when the inverter compressor is operating
	at or above 80 Hz.
P29	Occurs when missing phase or overcurrent (48 A) is detected at inverter compressor
	start. (the alarm at frequencies below 25 Hz)
H31	Occurs when HIC detects overcurrent (75 A), or when an abnormal high temperature
	(302°F) is reached.

The inverter current includes a primary current and secondary current. The alarm judgment utilizes both cur- rents. Generally, the secondary current is larger that the primary current.

(3)Constant-speed compressor

An alarm occurs when overcurrent or lock current is detected.

List of overcurrent and lock currents

Outdoor unit	Constant-speed	Overload
type	compressor	current [A]
96	Compressor 2	23.1

Lock current [A]

27.3

List of Alarms

Compressor	Compressor 2
No.
Detected	Overcurrent	Lock
current		current
Alarm display	H11	H12

(4) CT circuit detection trouble

		Alarm	Description
Compressor 1	(inverter	H03	Occurs when an open CT circuit is detected in the inverter
compressor)			compressor.
Compressor 2	(constant-	H13	Occurs when a current value of 1.5 A or less is detected
speed compressor)			when the constant-speed compressor is operating.

If the inverter compressor operating frequency is low, the current value is also low. Therefore this alarm is detected only when the compressor is stopped.

The operating current of the constant-speed compressors is always higher than 1.5 A. Therefore, this alarm occurs as the result of an open circuit or failure.

1 - 26