Table of Contents
Advertisement
4. Instalation (cont.)
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.
DRIVE PUMP
ACIONAMENTO DA BOMBA
LEGEND:
Legenda:
Pump
Bomba
On/Off Valve (24VCA)
Válvula On/Off (24VCA)
Flow Control Valve
Válvula controle de vazão
FIG. 16 : Typical Single-Pump Interconnection Schematic Drawing
It is mandatory to activate the pump by the controls of the chillers.
22
IMPORTANT
MASTER
SLAVE
MESTRE
ESCRAVA
SLAVE
SLAVE
ESCRAVA
ESCRAVA
NOTE
SLAVE
SLAVE
ESCRAVA
ESCRAVA
SLAVE
SLAVE
ESCRAVA
ESCRAVA
Advertisement
Table of Contents
