15
In
Input
Out
Output
ST3
Temperature probe
ST4
Temperature probe
SFA
Air vent valve
RSA
Water drain valve
PW
Differential pressure switch
CA
Condenser
MP
Circulating pump
PV3E
Evaporation control valve
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
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.
