CIAT LP Series - Page 45

HEAT PUMPS - AIR CONDITIONING - REFRIGERATION - AIR HANDLING - HEAT EXCHANGE - NA 12.122 H
Water chillers and
air-water heat pumps
45
CIATCooler LP
Plate exchanger
- The exchangers are fi tted with thermal insulation. Check that the
foam is not unstuck or broken.
- The water quality and the pressure drop must be verifi ed at the ex-
changer level. After verifying the mesh fi lter condition, if necessary, the
exchanger must be cleaned. To this end, a weak solution of phosphoric
acid 5% must be circulated using the high pressure pump. During
optimum cleaning, the cleaning solution fl ow must, as a minimum,
be 1,5 times the working fl ow, preferably in the inverse circulation
mode. This must be followed by thorough rinsing with water to remove
any acidic residues. It is advisable to circulate a solution 1%-2% of
sodium hydroxide prior to the last rinsing in order to ensure that the
acid has been neutralised.
- Any repair or modifi cation to the plate exchanger is prohibited. It can
only be replaced by an original part.
• Access to the plates exchangers both the main circuit and the
recovery circuit in models 640 to 960 STD and 420 to 720 HEE:
Because it is a dual plates exchanger, is it located in the central
area of the unit, on the axis of symmetry of the two circuits. If the
exchanger have to be replaced, the two panels indicated in this
image must be removed.
Dehydrating
fi lters
Plates exchager
Panels
- To be able to unscrew the water connections of the exchanger, the
unit incorporates another movable panel which is accessed by the
door on the left side of the above door. By registering also accessed
the recovery exchanger.
Plate exchanger
of the main
circuit
Plate exchanger
of the recovery
circuit
Water
threaded
conections
In the following image it is possible to observe the plate exchanger of
the main circuit extracted .
Access
panel
Mesh fi lter
- It is also necessary to install a fi lter in the hydraulic power
supply to the unit in order to prevent clogging of the plate
exchanger.
- For LPC/ILPC units, a kit with a stainless steel mesh fi lter (500
microns) is also supplied for installation by the installer. Optionally,
this fi lter can be supplied for LP/ILP units.
- The fi ltering mesh must be removed and cleaned in order to clean
the fi lter.