4.5
PV3E evaporation control
On the source side there is a limit on the inlet temperature of 45 ° C.
If there are applications in which it is necessary to enter with water at
a higher temperature, it is necessary to adopt an evaporation control
by means of a 3-Way valve following the diagram shown below.
The proposed scheme must be respected to allow the maintenance
of the flow rate to the exchanger (Evaporator), it also allows the
control of the inlet temperature of the evaporator by injecting cold
water.
The analogue control signal comes directly from the unit control.
If the 3-way valve is not supplied, bear in mind that the control signal
is only and exclusively 0-10V (IVE option).
The servomotor, therefore, must necessarily be able to be controlled
by this signal.
The valve is supplied, but the installation must be carried out on
site following the principle diagram shown.
The valve must be installed near the unit.
4.6
PV3C cold start
If in the applications a system cold start with a high thermal load on
the user side is envisaged, it may be useful to equip the unit with the
"Cold start" accessory to keep the compressor functioning within its
permitted operating range.
The proposed scheme must be respected to allow the maintenance
of the flow rate to the user side exchanger (condenser), it also allows
the control the inlet temperature to the condenser by injecting hot
water.
The analogue control signal comes from an additional card included
in the accessory and assembled in the unit's electrical panel.
If the 3-way valve is not supplied, bear in mind that the control signal
is only and exclusively 0-10V (IVC option).
The servomotor of the same must necessarily be able to be controlled
by this signal.
The valve is supplied, but the installation must be carried out on
site following the principle diagram shown.
The valve must be installed near the unit.
In Input
Out Output
ST1
Temperature probe
ST2
Temperature probe
SFA
Air vent valve
RSA
Water drain valve
PW
Differential pressure switch
CA Condenser
MP
Circulating pump
PV3C
Cold start valve
In Input
Out Output
ST3
Temperature probe
ST4
Temperature probe
SFA
Air vent valve
RSA
Water drain valve
PW
Differential pressure switch
EW Evaporator
MP
Circulating pump
PV3E
Evaporation control valve
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