Protection Control; High Pressure Protection Control - Daikin RTSQ20PY1 Service Manual

SiBE31-801_C

7. Protection Control

7.1

High Pressure Protection Control

This high pressure protection control is used to prevent the activation of protection devices due
to abnormal increase of high pressure and to protect compressors against the transient
increase of high pressure.
[In cooling operation]
★
Pc > 3.47MPa
INV. compressor (see *1):
3 steps down per 10 sec.
• Pc > 3.55MPa
&
• A lapse of 10 sec.
STD compressor 2:
OFF
& • Pc > 3.55MPa
• A lapse of 10 sec.
STD compressor 1:
OFF
Pc > 3.64MPa
Restart standby
(2 times per 30 min. at maximum)
Function
The following control is performed in each outdoor unit (and function unit).
Normal operation
• Pc < 3.24MPa
&
• A lapse of 15 sec.
INV. compressor (see *1):
1 step up per 15 sec.
• Pc > 3.47MPa
&
• A lapse of 10 sec.
• Pc > 3.55MPa
&
• A lapse of 10 sec.
INV. compressor:
Stop due to malfunction
(E3 displayed)
Compressor step
Pc: Value detected by high pressure
=Max · step
*1: For INV. compressor steps, refer
52 Hz
High pressure sensor (4.0MPa) is activated.

Protection Control

sensor by each outdoor unit (and
function unit).
to information on P.92 and 93.
98