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On the backup machine the pumps are off, the LED flashes on and off at 1-second intervals and the following message is displayed:
C) Forced stop of machines:
This function can be configured to prevent a machine from operating.
D) Water loop winter protection:
If parameter P142 on the master machine = Yes
In heating mode:
- This function is possible if P142 on the master machine = Yes, if
the automatic operation control inputs on both machines are
open, and both machines are set to On. The function must
maintain the water inlet temperature on the heat exchanger at
30°C as soon as the outdoor temperature 3°C (2 K differential =
pump and compressors shut off immediately)(Cascade control on
the return line).
- Adjust water-to-water units to the hot water sensor.
- The heating LED is lit; the On/Off LED flashes.
- If a fault occurs on the outdoor sensor, maintain the water loop
at 30°C.
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.
22.1.4 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:
The machine is then shut off.
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 (P141 = 1 on master machine):
- The control sensor used is on the master machine. If it is shut off
(On/Off by automatic operation controls) or a fault has occurred
on it, the slave machine
will operate using its own setpoint and its own sensors.
Supply control (P141 = 3 on master machine):
- A sensor must be added to the water outlet manifold
connecting both machines. To do so, the sensor must be
connected to the slave machine in place of the water inlet sensor
on this machine (terminals 2-3 on terminal block 7 of the
motherboard)..
- The control temperature is sent by the slave machine connected
to the water inlet on the slave‟s heat exchanger.
- The manifold water outlet temperature is the water outlet
temperature on the master machine‟s manifold.
- The water inlet temperature on the slave‟s heat exchanger is the
temperature from the master machine, including in parameter
P255.
- The water outlet temperature on the slave‟s manifold is the
temperature of the water outlet on the slave‟s manifold.
M U L T I U N I T M A N A G E M E N T
B A C K U P M A C H I N E
M A I N T A I N W A T E R L O O P
T E M P E R A T U R E A T 3 0 °
W A T E R C I R C U L A T I O N
P U M P F O R C E D O N
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
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