Translation from original instructions
Packaged Rooftop
37
We reserve the right to make changes without any prior notice.
UATYA
4P645202-1
5.4 Hydraulic connections
If the unit has parts that require a hydraulic connection to be carried out by the installer, it is
mandatory to fit a metal mesh filter with mesh size no larger than 1 mm on the inlet pipes. If this is not
installed, the warranty is voided immediately.
5.4.1 Hot water coil connection
The use of muddy water or water with a high limestone content can cause a rapid decline in coil
performance.
Connect the hot water coil following the inlet and outlet indications shown on the unit.
The diameters and types of connection required are indicated in the dimensional drawings.
It is advisable to feed the coil with a water-glycol mixture at a percentage that depends on the minimum winter
temperatures to prevent freezing of the water inside the hydraulic circuit when it is not being used.
If a water and glycol mixture is not used, the hydraulic system must be emptied whenever it is to
remain unused for a long time.
To make the circuit emptying operations easier, there is a drain valve on the underside of the manifold that feeds the
hot water coil. This manifold also has an air valve at the top that can be used to eliminate any air pockets there may
be in the circuit.
The glycol percentage by weight is determined based on the envisaged minimum ambient temperature.
Minimum ambient temperature (°C)
0
-5
-10
-15
-20
-25
-30
-35
-40
Freezing point (°C)
-5
-10
-15
-20
-25
-30
-35
-40
-45
Antifreeze
% by weight
Ethylene glycol
6
22
30
36
41
46
50
53
56
Propylene glycol
15
25
33
39
44
48
51
54
57
5.4.2 Condensate drain of the internal air coil
The condensate collection tray is provided with a male R 1" threaded pipe for connection.
Fig. 7 Connection to the condensate collection tray
On the condensate discharge pipe it must be installed a proper syphon in order to avoid that outdoor air may be
blown through it.
It is good practice to make a syphon straight after the connection to the tray.
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