Parker Hyperchill PCW420 - Automatic Restart; Alarms Management; Chiller Operation

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7/10
PCW420-650
4.7.9 Maintenance parameter
PARAMETER CODE TYPE DEFAULT
Reset chiller hour counter
rSHU
U
-
Reset compressor 1 hour
counter
rSH1
U
-
Reset compressor 2 hour
counter
rSH2
U
-
Reset compressor 3 hour
counter
rSH3
U
-
Reset compressor 4 hour
counter
rSH4
U
-
Reset alarm history
rSSt
U
-
4.8 Chiller operation
4.8.1 Status machine
It is possible to see the status machine on the digital output
Stato Descrizione
Unit Status :
chiller OFF
Unit Status :
chiller ON
4.8.2 Pump
The pump starts together with the chiller, a few seconds later.
It turns off together with the chiller, a few seconds later.
4.8.3 Compressor
The ON/OFF of the compressors depends on the water outlet
temperature (b1) with reference to the “set” and “dif” param-
eters.
The compressor ON/OFF logic depends on the ambient tem-
perature.
Ambient Temperature ON/OFF compressor
> 50°F
step control
< 50°F
together
Example
set = 45°F; dif = 7.2 °FC; ambient temp. <50°F
- when the water inlet temperature reaches 48.2 ° F (45 + 3.2) :
compressor 1 starts;
- when the water inlet temperature reaches 52.2 ° F (45 + 7.2):
compressor 2 starts.
set = 45°F; dif = 7.2 °F; ambient temp. >50°F
- when the water inlet temperature reaches 52.2 ° F (45 + 7.2):
compressors 1 and 2 starts;
Warning: a compressor can only restart after a stop of 6
minutes.
4.9 Alarms management
When the button (P1) is red, una alarma está presente.
Press the button to see the type of alarm.
es:
HP1
High pressure Alarm
Circuit 1
Note: eliminate the cause of the fault for clear the alarm.
Carry out the repair.
press the button
(P1)
If this message appear “noAL”
noAL
HP1
High pressure Alarm
Circuit 1
press the button (P1) to reset the alarm.
4.9.1 Digital input alarms
CODE DESCRIPTION RESET
HP1
High pressure alarm 1 from pressure switch M
LP1
Low pressure alarm 1 from pressure switch M
tP
Pump thermal cutout alarm M
LL
Water tank low water level alarm / No water
 ow
A
HP2
High pressure alarm 2 from pressure switch M
LP2
Low pressure alarm 2 from pressure switch M
PI1
Protection alarm compressor 1
/ Phases monitor
M
PI2
Protection alarm compressor 3
/ Phases monitor
M
CODE DESCRIPTION RESET
PI2
Protection alarm compressor 2
/ Phases monitor
M
PI4
Protection alarm compressor 4
/ Phases monitor
M
4.9.2 Analog input alarm
AI CODE DESCRIPTION RESET
b1
HA1
Tank water outlet water high tem-
perature alarm
Warning
LA1
Tank water outlet water low tem-
perature alarm
A
St1
Sensor open circuit or short circuit M
b2
HA2
Evaporator 1 outlet water high
temperature alarm
Warning
LA2
Evporator 1 outlet water low tem-
perature alarm
A
St2
Sensor open circuit or short circuit M
b5
HA5
High ambient temperature warning Warning
LA5
Low ambient temperature warning Warning
St5
Sensor open circuit or short circuit M
b7
HA7
Evaporator 2 outlet water high
temperature alarm
Warning
LA7
Evporator 2 outlet water low tem-
perature alarm
Warning
St7
Sensor open circuit or short circuit M
4.10 Automatic restart
In the event of a power failure, when power is restored the
chiller will assume theOn-Off statusheld at themoment the
power was lost.