Daikin FH35BZV1 [192/397] Hps and lps function

General Functionality ESiEN02–01A

2–14 Part 2 – Functional Description

1.9 HPS and LPS Function

Applicable units R(Y)P71-250B

Purpose HPS (High-Pressure Switch)

If the pressure at the discharge side of the compressor becomes abnormally high, the HPS stops the

unit automatically in order to prevent it from breaking down.

LPS (Low-Pressure Switch)

If the pressure at the suction side of the compressor becomes abnormally low, the LPS stops the unit

automatically in order to prevent it from breaking down.

Method The table below describes what happens in case of HPS or LPS activation.

Used input The HPS and LPS detection function uses the following inputs:

If the... is activated Then... Remark

HPS The compressor stops and

stands by for 3 min.

If this is activated an additional 6 times

from the first detection and before it is

turned OFF by the remote control,

the operation stops due to malfunction.

LPS The compressor stops and

stands by for 3 min.

However, depending on the

operating conditions, the com-

pressor may not turn OFF.

Input

Connection on

indoor PCB

Connection on

outdoor PCB

High-pressure switch — X9A

Low-pressure switch — X10A