22
It is mandatory to activate the pump by the controls of the chillers.
NOTE
System Hydraulic Interconnection
The control allows two types of hydraulic interconnection: Interconnection with Single Pump or Individual Pump. It is necessary
to confi gure the control.
a) Interconnection with single pump
Concept where there is only one power pump for the system. An ON / OFF valve must be installed for each module that will control
it individually. This valve will open when the chiller is driven by the master unit and will remain closed while the chiller is turned off .
Interconnection with a single pump can be done using a variable fl ow pump (fi eld installation), which allows absorbing the fl ow
variations of the modules on / off function. If no variable fl ow is used, a 3-way valve must be used (see a1) instead of the two-way
ON/OFF valve.
Proper fl ow control is mandatory. The high / low fl ow can trigger alarms such as E-32/34/35/36, because the PID control won’t
operate correctly.
It is recommended to place a fl ow control valve at each unit inlet. We recommend an independent pressure valve so that the fl ow
is adequate regardless of how many modules are in operation.
The chiller does not have on its electrical switchboard a power system for the pumps, only signal sending to on
/ off. The pump power switchboard must be installed in the field. Do not use the terminal block of the chillers
to power the pump.
IMPORTANT
4. Instalation (cont.)
MESTRE
ESCRAVA
ESCRAVA
ESCRAVA
ESCRAVA
ESCRAVA
ESCRAVA
ESCRAVA
ACIONAMENTO DA BOMBA
Legenda:
Bomba
Válvula On/Off (24VCA)
Válvula controle de vazão
FIG. 16 : Typical Single-Pump Interconnection Schematic Drawing
DRIVE PUMP
Pump
On/Off Valve (24VCA)
Flow Control Valve
MASTER
SLAVE
SLAVE
SLAVE
SLAVE
SLAVE
SLAVE
SLAVE
LEGEND:
