Hydraulic Connections; Hot Water Coil Connection - Daikin UATYA-BBAY1 Manuel D'installation, D'utilisation Et D'entretien

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

Refer to the section titled "Water composition" for the water specifications.
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)
Freezing point (°C)
Antifreeze
Ethylene glycol
Propylene glycol
Max. temperature and pressure limits
The table below shows the conditions of max. water temperature and pressure, based on the required hot water coil
and the size.
Coil
Pre-heating coil
Standard hot water coil
Oversized hot water coil
We reserve the right to make changes without any prior notice.
UATYA
4P645202-2
0 -5 -10 -15
-5 -10 -15 -20
% by weight
6 22 30 36
15 25 33 39
Tmax=95°C Pmax=10bar
for sizes ≤ 50
for sizes ≤ 120
for sizes ≤ 50
-20 -25 -30 -35
-25 -30 -35 -40
41 46 50 53
44 48 51 54
Tmax=100°C Pmax=10bar
for sizes > 50
for sizes > 120
for sizes > 50
Translation from original instructions
Packaged Rooftop
-40
-45
56
57
37