York YLCC-H Technical Information page 21

Hydraulic connections
The hydraulic connections of the water intake and outlet of
the chiller should be carried out respecting the intake and
outlet directions indicated on the front of the unit.
An iron (not galvanised) or copper tubing can be used, with
dimensions no lower than those indicated, and keeping in
mind the pressure drops of the indoor exchanger and of the
installation.
Pump dimensioning should be carried out considering a
nominal flow that allows the ∆t of the project within the limits
of the unit: min. 3° C and max. 7° C. The head pressure of the
pump chosen must cover the pressure drops of the installa-
tion plus the pressure drops of the chiller.
It is convenient that the tubing connection be carried out by
means of anti-vibratory couplings.
In all cases, a flow switch should be installed so as to avoid
the possibility of operation without water circulation, as well
as a water filter (obligatory for warrantee application).
In the water return tubing, an expansion vessel adequate to
Hydraulic connections diagram
����
������
������������������
���������������
�����������
���������������
����
������
�����������
���������������
the total volume of the water in the installation should also
be installed.
Chiller water volume is as follows:
Size
42
62
82
102
122
152
During the winter season, with outdoor temperatures below
0° C, precautions should be taken to avoid water freezing in
the tubing networks and inside the chiller exchanger.
The following solutions are usually applied:
a) Drain the circuit.
b) Fill the circuit with an antifreeze solution (glycol).
c) Keep the circulator in constant operation.
Note: See hydraulic connections diagram.
�����������
���������
������
�����
��������
�����
�����������
��������������
Litres
25
28
38.2
38.2
78.5
73.5
�����������
�����������
������
������
�����
���������
�������
��������
2