Discharge Temperature Protection Control; Both Inverter And Standard Outdoor Units - Daikin VRV Inverter K Series Manual

SI-05C.BOOK Page 237 Monday, November 6, 2000 4:13 PM
SiE-05C

4.10 Discharge Temperature Protection Control

In order to prevent deterioration of refrigeration oil due to rising discharge temperature, temperature is kept
from rising by reduction of compressor frequency or injection cooling at the following stages when
temperature falls below the reference values.

4.10.1 Both Inverter and Standard Outdoor Units

(k:kg/cm²)
When Cooling/Heating
Discharge temp.
thermostat ≥ 135˚C
Stop due to
F3 malfunction
Cancel conditions
Tdi or Tds < 115˚C
When cooling
LP < 3.0 (Te < -6.8˚C)
&
Upper flow side comp.
discharge temp. > 90˚C
Injection ON
Injection cancel conditions
Injection is canceled if any of the following five conditions are met.
(1) No.1 compressor discharge temp. < 90˚C
&
No.1 compressor discharge superheating
temp. < 35˚C
Oil temp. < 55˚C
(2) Upper flow side comp. discharge temp.
below 105˚C
&
Upper flow side comp. discharge
superheating temp.< 50˚C
Oil temp. < Te + 10˚C
Functions PLUS Series
Up to 2 times within 100 minutes
Discharge temp. thermostat
Discharge temp. thermostat
≥ 130˚C ≥ 95˚C
Forced OFF by thermostat
Cancel conditions
Restart standby
When heating
LP < 2.0 (Te < -15.1˚C)
&
Upper flow side comp.
discharge temp. > 90˚C
Injection ON
(3) Upper flow side comp. discharge superheating
temp. < 15˚C
(4) LP > 4.0 (Te > - 0.4˚C)
or
Upper flow side comp. discharge temp. < 70˚C
(5) LP > 4.0 (Te > - 10.7˚C)
or
Upper flow side comp. discharge temp. < 80˚C
2 minutes following 1st compressor
start for each unit
No.1 compressor discharge temp.
> 110˚C
or
No.1 compressor superheating temp.
> 55˚C
Injection ON
Cancel conditions
Frequency reduction
No.1 compressor discharge
(every 3 minutes)
superheat temp. < 15˚C
or
2 minutes elapse after compressor
Cancel conditions
start
Td ≤ 95˚C
2 minutes following
oil return and defrost
completion
Injection ON
Cancel conditions
2 minutes elapse
During oil return and defrost
preparation only
Discharge superheating temp.
> 35˚C
Injection ON
Discharge superheating temp.
> 15˚C
Oil temp. > 65˚C
Injection ON
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Outline of Control
(VF119)
237