Discharge Pipe Protection Control - Daikin RQYQ140-180PY1 Service Manual

SiBE341001

2.6.3 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.
The following control is performed for each compressor.
[INV compressor]
HTdi > 115˚C
INV. Comp.:
1 step down / 30 sec.
Function
Normal operation
• HTdi < 110˚C
&
• After 20 sec.
• HTdi > 115˚C
&
• After 30 sec.
Frequency agreement
Compressor system: Step 1
• HTdi > 135˚C
or
• HTdi > 120˚C continues for 10 minutes
or more.
Restart standby: 10 min.
(2 times per 100 min. at max.)
HTdi < 100˚C
INV. Comp.:
1 step up / 20 sec.
• HTdi>130˚C
or
• HTdi>120˚C continues for 90 seconds
or more.
Discharge pipe temperature standby
3 times per 100 min.
Stop due to malfunction
(F3 displayed)
HTdi: Value of INV. compressor
discharge pipe temperature
compensated with outdoor air
temperature.
Detailed Control Functions
50