Carrier AQUASNAP 30RBM Series Installation, Operation And Maintenance Instructions page 56

Units supplied with hydraulic module
Master/Slave operation is possible only when the units are
installed in parallel:
• The Master/Slave assembly is controlled on the water
inlet without any additional sensors (standard
configuration) (see example 1).
• Control on the water outlet is also possible by adding two
extra sensors in the common supply pipe work (see
example 2).
Each unit controls its own water pump.
Units supplied without hydraulic module
In the case of units installed in parallel, and if there is only
one common pump installed by the installer, isolating valves
must be installed on each unit. These should be controlled
(opened and closed) using the control for the relevant unit
(valves for each unit can be controlled using the unit water
pump control outputs). Refer to the control manual for the
connections.
In this case, a variable-speed pump must be controlled by the
unit via the 0-10 V dedicated output of the Master unit (control
on Delta T° only).
An installation in series is only possible with a fixed speed
pump (example 3):
• The operation of the pump will be controlled by the
Master unit.
• The Master/Slave assembly is controlled on the water
outlet without additional sensor.
• Installation must only be carried out according to the
diagram in example 3.
IMPORTANT:
Both of the units must be equipped with an option to allow
Master-Slave operation.
If one or both units is equipped with the variable-speed pump
option, it is strongly recommended not to set the control mode
on the pressure differential. The same setpoint is recommended
for configuring the temperature differential mode.
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Example 1: operation in parallel - control on water inlet
for a hydraulic module
1
Example 2: operation in parallel - control on water outlet
for a hydraulic module
1
T
T
Example 3: operation in series - control on water outlet
for a unit assembly
1
Key:
All dimensions are in mm.
1 Master Unit
2 Slave unit
Water inlet
Water outlet
Control boxes for the master and slave units
Water pumps for each unit (normally included in the units with hydraulic module)
Additional sensor for water outlet control, to be connected to channel 1 of the
T
slave boards of each master and slave unit
CCN communication bus
Connection of two additional sensor
Non-return valve
2
2
2