Discharge Pipe Protection Control - Daikin RTSQ20PY1 Service Manual

SiBE31-801_C
7.3

Discharge Pipe Protection Control

This discharge pipe protection control is used to protect the compressor internal temperature
against a malfunction or transient increase of discharge pipe temperature.
This control is performed by each compressor.
[INV compressor]
★
HTdi > 115°C
INV. compressor (see *1):
1 step down
HTdi > 120°C continues
for a period of 90 sec.
Compressor:
62 Hz + ON + OFF
HTdi > 120°C continues
for a period of 90 sec.
Compressor (see *2):
62 Hz + OFF + OFF
[STD compressor]
★
Normal operation
Function
The following control is performed for each compressor of outdoor (and function unit).
Normal operation
HTdi < 100°C
• HTdi < 110°C
&
• A lapse of 20 sec.
• HTdi > 115°C
&
• A lapse of 30 sec.
OR
Restart standby: 10 min.
(2 times per 100 min. at maximum)
For systems with multi outdoor units, the control shown below is conducted by outdoor
unit.
• HTds > 120°C continues for a period of
OR
continuous 5 min. or more
• HTds > 135°C
INV. compressor (see *1):
1 step up
Master + Slave units
Master unit
• HTdi > 135°C
• HTdi > 120°C continues for a period of 10 min.
Stop due to malfunction
F3
( displayed)
10 min.
HTdS: Value of STD compressor discharge
pipe temperature (Tds) compensated
with outdoor air temperature.
Protection Control
HTdi:Value obtained by
correcting the discharge
pipe temperature (Tdi) of
INV. compressor with
outdoor temperature.
*1: For INV. compressor
steps, refer to information
on P.92 and 93.
Lower limit of compressor
step on this control:
62 Hz + OFF + OFF
Discharge pipe temperature standby
occurs 3 times in a period of 100 min.
STD compressor stops
102