CIAT LP Series - Checks in the Centrifugal Fans: STD Version

HEAT PUMPS - AIR CONDITIONING - REFRIGERATION - AIR HANDLING - HEAT EXCHANGE - NA 12.122 H
Water chillers and
air-water heat pumps
25
CIATCooler LP
CONNECT SIPHON
METTRE SIPHON
PONER SIFON
V220014
Siphon installation norms
All water drain tubes must be provided with a siphon to avoid bad smell
and water spills.
• Pan in overpressure: It is installed to avoid the access through the
drain piping of bad smells.
• Pan in underpressure: Water must be suctioned from the pan
because of the depression with respect to the motorfan assembly.
Perform the siphon assembly as per the scheme of the attached
starting diagram:
- For the correct siphon design, the "A" height must be at least twice
that of the underpressure (mm.w.c) where the condensate pan is
placed.
- Check that the condensate outlet is not clogged.
- The drain piping must be slightly sloped to ease circulation towards
the drain.
- The original diameter of the piping must be respected. No reduction
can be made.
- With outdoor temperatures which are lower than 0°C, the
necessary precautions must be taken to prevent the water in the
drain ducts from freezing.
A
Condensates pan
in depression
A
Siphon drain
Slight slope
5/1000
To drainage
Check the connection air tightness.
Checks in the centrifugal fans:
STD version
- Before commissioning, check the blade rotation direction and that
the axis turns without strokes nor vibrations
- Once running, check the operation conditions: pressures, fl ows and
consumptions.
- The coupling of characteristic curves of the fan and the room is
very important, so that the fl ows and pressures provided to the duct
network are as required.
- In case they are not aligned, remove the pulley screws, remove the
pulley and, after removing the taper pin, it can be slid over the axle
(this action can be performed both in the motor as well as in the fan).
- After fi xing the pulleys on the same plane, the belt tension is made
by tightening the tensor screw.
- The belt tension must be checked after 24 hours of motor operation.
Attention: Before performing these operations, it is necessary to verify
that the unit is disconnected from mains.
Pulley and belt calibration
Centrifugal motorfans are coupled with pulleys and belts. In this type
of fans, the following must be taken into consideration:
- The pulleys must be on the same plane, so it is important to check
them with the help of a ruler or a laser aligner.
Taper pin
Pulleys must stay on the same plane
Tensor
screw
Pulley
screws