CIAT PowerCiat LX ST User Manual

EN-43 POWERCIAT LX ST/HE/XE
8.9 - Selecting the condenser pump
Heat reclaim condenser water ow rate/pressure drop
Heat reclaim condenser pressure drop
in water ow rate function
0
10
20
30
40
50
60
70
010203
04
0
Pressure drop, kPa
Water ow rate, l/s
1 Condenser 10” (water volume = 38 litres)
2 Condenser 12” (water volume = 55 litres)
3 Condenser 14” (water volume = 68 litres)
For units with a water-cooled condenser, please refer to chapter 9.1
“Technical data, LX units with heat reclaim condenser option”.
8.10 - Frost protection
The heat reclaim condenser is equipped with electric heaters to
protect the condenser against frost. These are activated if the
condenser entering and leaving water temperatures are below
3 °C and deactivated, if they are higher than 4.3 °C.
9 - FANS WITH AVAILABLE PRESSURE
If this option has been selected, the fans with available pressure are equipped with discharge connection flanges to facilitate the
duct connection.
Note: For LX ST units, each fan must be connected individually.
10 - OPERATION WITH A FREE COOLING DRYCOOLER
10.1 - Unit operation option with a free
cooling drycooler
10.1.1 - Operating principle
The units have been designed to optimise the operation of the
systems by using drycoolers as a
free cooling system (this process uses the low temperature of
outdoor air to cool the air conditioning system water).
This system allows substantial energy and cost savings, which
is the most effective when the outdoor air temperature is low.
The TouchPilot control of the unit includes algorithms to permit
constant automatic optimization of:
• the operation of the drycooler fans,
• the ow rate variation in the water loop,
• the cooling capacity (the drycooler and chiller can operate
independently or simultaneously),
• the positions of the valves depending on the operating mode
The control denes the optimal conguration considering water
set point value, outdoor air temperature and water loop
temperature (the control will give priority to the drycooler).
Parallel control of the fans and of the variable ow rate in the
water loop enable the system to operate in outdoor temperatures
of down to -20 °C without any additional control
Both the drycooler and the chiller must be equipped
with the option Free Cooling Management option.
Chiller
DC free
cooling
Communication bus
V2V control
NC
NO
OAT
1
2
3
For an optimal free cooling operation, the chiller has to be
congured:
- during regulation of the water inlet temperature,
- during regulation of the delta temperature, with the variable-
speed pump option.
8 - HEAT RECLAIM CONDENSER OPTION

CIAT PowerCiat LX ST Specifications

General

Brand	CIAT
Model	PowerCiat LX ST
Category	Water Dispenser
Language	English