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4 - HYDRAULIC CONNECTIONS
The water coils must be installed with perfectly horizontal
pipes. They must be connected following the indications on
the plates. In any case, the fluid must flow through the coil in
the opposite direction to the air being treated, so as to achieve
maximum heat output.
Do not size the piping in the circuit in reference to the
diameter of the coil fittings, as these are sized according to
constructional requirements and are in any case standardised.
The connections in the circuit must not impede the removal of
the coil from the unit.
Overheating inside the fan unit represents a danger
The accidental stopping of the fan will cause the overheating
of the stagnant air in the unit, with consequent damage to the
motor, the bearings, the insulation and the plastic parts.
The system must be fitted with suitable equipment to by-
pass the passage of water through the coil.
4.7 WATER COILS
1. Air flow
(1)
(1)
(2)
1. Thread
2. Fixation screw
4.9 STEAM COILS
All the coils are already fitted with pipes sloped towards the
outlet manifold to help drain the condensate, or alternatively
with vertical pipes.
When connecting to the supply mains, refer to the previous
precautions and comments.
In order to avoid damage to the coil (water hammer), special
attention should be paid to the sizing and the adjustment of
the valves and condensate drains.
Prevent stagnant condensate from forming inside the coil, in
the manifolds and in the supply mains.
Each coil must be fitted with its own condensate drain.
Overheating inside the fan unit represents a danger
The accidental stopping of the fan will cause the overheating
of the stagnant air in the unit, with consequent damage to the
motor, the bearings, the insulation and the plastic parts.
The system must be fitted with suitable equipment to by-pass
the passage of steam through the coil.
(A)
(B)
A. Inclined pipes
4.10 CONNECTING THE DIRECT EXPANSION COILS
Before starting to connect the coil, check that the pipes are
perfectly horizontal and run counter-current.
When performing the connections, all the adjustment and
control equipment must be installed.
(1)
(2)
1. Distributor
2. Discharge
The pump, expansion vessel and connection pipes are not
supplied.
The water and electrical connections to the electric pump
must be performed by the purchaser, following the normal
procedures for water coils.
4.8 DOUBLE FINNED COIL HEAT RECOVERY UNITS
(A)
(B)
B. Horizontal pipes
