12.2.4.3 - Installation
The hydraulic supply for each desuperheater is delivered in
parallel.
The hydraulic connection on the desuperheater water inlet and
outlets must not generate any local mechanical stress on the
exchangers. If necessary, install flexible couplings.
Fit water flow rate balancing and control valves at the exchanger
outlet.
Balancing and control of the flow rates may be performed by
reading the pressure drop in the exchangers.
The pressure drop on each of these must be identical to the total
water flow rate given by the selection programme.
To adjust the balancing valves before starting up the system, refer
to the pressure drop curves below.
It is possible to fine-tune the water flow rate settings for each
desuperheater when the unit is running at full load by trying to
obtain water outlet temperatures which are strictly identical for
each of the circuits.
Desuperheater (plate heat exchanger pressure drop curves)
1
10
100
0,1
1
10
100
1
2
3
4
5
6
Heat exchanger pressure drop (kPa)
Heat exchanger water flow rate (l/s)
B
Circuit with 1 compressor (units 602-2000)
E
Circuit with 4 compressors (units 602-2000)
C
Circuit with 2 compressors (units 602-2000)
F
Circuit with 3 compressors (units 2200-3500)
D
Circuit with 3 compressors (units 602-2000)
G
Circuit with 4 compressors (units 2200-3500)
12.2.4.4 - Operation
Desuperheater mode is activated and deactivated by DI-04 on the
CIOB B board ("DSHTR_SW"). (Customer terminal strip no.:
495/494)
If the desuperheater option is associated with an option (energy
management module – CIOB EMM board), the installer may
connect a switch to the DO-01 of a pump for the desuperheater
(item 9 - DSH_PUMP). (Customer terminal strip no.: 491/492).
The volume of the desuperheater circuit water loop must be as
low as possible to be able to rapidly increase the temperature
during warm-up.
The minimum desuperheater water inlet temperature is 30°C.
This may require the use of a three-way valve (item 31), with its
controller and sensor controlling the minimum required water inlet
temperature.
The desuperheater water loop must include an expansion tank
selected on the basis of the water loop volume and a valve
(calibrated to over 10 bar) to maintain the water temperature below
100 °C.
12.2.4.5 - Operating limits
LD units
Desuperheater
Minimum
Maximum
Water inlet temperature at start-up
°C
30
(1)
75
Water outlet temperature during operation °C
45
80
Water inlet temperature on shut-down
°C
3
75
ILD units
Desuperheater
Minimum
Maximum
Water inlet temperature at start-up
°C
30
(1)
60
Water outlet temperature during operation °C
45
80
Water inlet temperature on shut-down
°C
3
60
Note
: Do not exceed the maximum operating temperature.
(1) The water inlet temperature at start-up must not be lower than 30°C. On lower
temperature installations, a 3-way valve is required until the desuperheater water
outlet reaches 45°C.
12 - OPTIONS
AQUACIAT
POWER
™ LD/ILD
EN-66
