Parker Hyperchill PCW420 User Manual Download

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English

4/8

PCW420-650

4 Control

4.1 Control panel

Fig.1

LIV

Low water level

enter

Low pressure

Pump alarm

High pressure

off

Power supply

P1
P2

P3
P4

Compressor alarm

alarms

WATER

OUT

WATER

LIV

Low water level

enter

Low pressure

Pump alarm

High pressure

off

Power supply

P1
P2

P3
P4

Compressor alarm

alarms

P0 Isolator switch.
P1    On key: activates the controller.
P2    Off key: deactivates the controller.
P3    UP key: used to increase the value of a modifi able parameter.
P4    DOWN key: used to decrease the value of a modifi able parameter
P5    Enter key: used to confi rm modifi cations to parameters.
P6    Alarms key: used to reset all manual reset alarms.

LED

FLASHING

L1: yellow

Controller is receiving
power

L2: green

Controller is On

With the controller receiving power
and ‘Off’: an antifreeze heater is
on.

With the controller receiving power
and ‘On’: compressor called for,
but wating for a delay time to
elapse.

L3: red

°C unit of measurement

L4: red

°F unit of measurement

L5: red

High pressure alarm

USER Loop or FACTORY program-
ming mode

L6: red

Low pressure alarm

L7: red

Pump temperature alarm

L8: red

Low water level alarm

L9: red

Compressor protection
alarm

4.2 Starting the chiller

• Connect the power supply to the machine by turning the main
isolator switch QS [P0] to ON.
• Turn the chiller ‘ON’ by pressing the key [P1].
• Set the desired temperature on the controller.

Phases Monitor

If appears on display the alarm “PI1 “(para. 4.6.1), during the start up,
the user must verify the wiring of the input terminals of the discon-
necting switch.

4.2.1

Adjustments at commissioning

a) The chiller is set for operation at a default temperature of 44.6°F (7

°C) with a differential of 7°F (4 °C); to adopt a new setting, see head-
ing 4.5..

b) Verify correct operation of the pump, using the pressure gauge (read

P1 and P0) and checking the pressure limit values (Pmax and Pmin)
indicated on the pump data plate.
P1 = pressure with pump ON
P0 = pressure with pump OFF
Pmin < (P1-P0) < Pmax
- Example n°1.
Conditions:
closed circuit, pressure P0 = 29 PSIg (2 bar)
pump data plate values: Pmin 14PSIg(1 bar)/ Pmax 43PSIg (3 bar)
adjust the valve outlet to give a pressure of
43PSIg (3 bar) < P1< 72PSIg (5 bar)
- Example n°2.
Conditions:
open circuit, pressure P0 = 0 PSIg (0 bar)
pump data plate values: Pmin 14PSIg(1 bar)/ Pmax 43PSIg (3 bar)
adjust the valve outlet to give a pressure of
Pmin 14PSIg(1 bar)/ Pmax 43PSIg (3 bar)

c) Verify correct operation of the pump similarly under normal running

conditions.
Check also that the amperage of the pump is within the limits indi-
cated on the data plate.

d) Switch off the chiller and proceed to top up the hydraulic circuit at

the “SET” temperature.

e) Check that the temperature of the “treated” water does not fall

below 41°F (5 °C) and that the ambient temperature in which the
hydraulic circuit operates does not fall below 41°F (5 °C). If the
temperature is too low, add the appropriate quantity of glycol, as
explained under heading 3.3.2

4.3 Stopping the chiller

When chiller operation is no longer required, turn the chiller off as fol-
lows: press key [P2] to switch the controller ‘Off’.
Do not turn off the main switch QS [P0] to ensure that any antifreeze
protection devices will still receive electrical power.

4.4 Parameter settings

General

There are two levels of protection for parameters:

a) Direct (D): with immediate access,

User-changeable;

b) Password protected (U): password required for access;

Factory-set

parameters.

4.4.1 Chiller

parameters

PARAMETER

CODE