EN - 41
Corresponding message on each machine:
In cooling mode:
- This function is possible if P142 on the master machine = Yes, the units are set to On, and the automatic operation control inputs on both
machines are open. In this mode, the pump is turned on when the outdoor temperature
P220 and shut off at P220 + P222.
Corresponding message on both machines:
If a fault occurs on the outdoor temperature sensor, the pump is forced on.
Note regarding the circulation of water during freezing weather:
the customer must install a bypass so as to avoid creating a temperature
problem during use.
17.4 Controls:
►
Operating mode:
Note:
The slave machine's operation is determined by the master unit (P119). If P28 = Yes, its operation cannot be changed via the
corresponding on/off input, via the console or because of the outdoor temperature.
If the slave machine has a different P199 value than the master machine (e.g. master set to cooling/heating while slave set to cooling only) and
a call is made for the slave to operate in a different mode than the master, the slave machine is shut off and the following message is displayed:
►
Control setpoint calculation:
The control setpoint is set by the master machine. If a fault occurs on the master machine, the slave machine operates using its own setpoint
and its own sensors.
●
Return control:
The control sensor used is on the master machine. If it is shut off (On/Off by automatic operation control) or a fault has occurred on it, the
slave machine will operate using its own setpoint and its own sensors.
●
Supply control:
- A sensor must be added on the water supply manifold connecting the two machines. This sensor must connected between terminals 10 and
11 on terminal block J3 of the ADD3 board on the master machine.
- If at least one of the two machines has three circuits (POWERCIAT chiller with cooling control only):
Parameter P261.1 (displayed on the controller for both machines) is the water outlet temperature of the manifold connecting modules 1 and 2
on each machine. Parameter P261.2 is the water outlet temperature of the manifold shared by the master/slave machines.
In the measured values menu for the master machine, the manifold water outlet is the water outlet of the manifold shared by the master/slave
machines.
In the same menu for the slave machine, the water outlet temperature displayed is that for the manifold between the two modules of the 3-
circuit slave machine.
• Cascade control:
COMPRESSOR 1
COMPRESSOR 2
COMPRESSOR 3
Note:
P804 = Cascade, Parameter P805 is the differential that determines when stage 1 on machine 1 turns on in relation to the setpoint.
P806 is the differential that determines when the last stage on machine 2 turns off in relation to the setpoint.
W A T E R T E M P E R A T U R E
M A I N T A I N 3 0 °
W A T E R C I R C U L A T I O N
F O R C E D P U M P R U N N I N G
S L A V E F A U L T
P 1 1 9 O P E R A T I N G M O D E
P805
P806
MACHINE 2
MACHINE 1
STP