Daikin Altherma HT Wartungshandbuch PDF herunterladen (Seite 175)

ESIE09-08A Troubleshooting by Indication on the Remote Controller

Troubleshooting 165

:  Refer to information on page 219.

YES

CHECK 2

Is the

stop valve

open?

Open the stop valve.

 Mount a pressure gauge on the low-pressure service port.

 Connect the Service Tool.

 Reset the operation using the remote control, and then restart

the operation.

Are the

characteristics of

the low pressure sensor

normal? (See

*1.)

Replace the low pressure sensor.

Is the

pressure

detected with the PC

board normal?

(See *2.)

Replace the control PC board (A4P)..

· The low pressure sensor is normal, and the pressure

detected with the PC board is also normal.

· The low pressure has really become low.

Refer to “remove the causes by which the low

pressure has become low”.

*1: Make a comparison between the voltage of the pressure sensor (*4) and that read by the

pressure gauge.

(As to the voltage of the pressure sensor, make measurement of voltage at the connector,

and then convert it to pressure.)

*2: Make a comparison between the low pressure value checked with the Service Tool

and the voltage of the pressure sensor (see *1).

*3: Make measurement of voltage of the pressure sensor.

Caut ion

Be sure to turn off power switch before connecting or disconnecting

connector, otherwise parts may be damaged.

+5V

(4)

(3)

(2)

(1)

Connector for low pressure sensor

Micro controller

A/D input

Make measurement of DC voltage between these wires. (*4)

(Blue)

Red

Black

White

Low

pressure

sensor

Check No.2

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