DORA TECH
90 LT - 120 LT
99
cod. 3540000800 - Rev. 02 - 09/2023
EN
OBLIGATION
For the correct operation of the
device, it is essential to install a
0.7 MPa safety unit (7 bar, light
series supplied as standard) on
the cold water inlet. Use only
connecting pipes (not supplied),
rigid and resistant to electrolysis
both at the inlet of cold water and
at the outlet of hot water from the
device.
fig. 55 - Safety valve 0.7 MPa (7 bar)
The figure below shows an example of a hydraulic connection.
11 1
13
17
15
18
10
10
12
9
5
6
4
14
fig. 56 - Example of water system
Legend
1
Inlet tube
4
Cold water inlet pipe
5
Hot water outlet pipe
6
Condensate drain
9
Inspectable end of the exhaust pipe
10
Pressure gauge
11
Shut-off valve
12
Pressure regulator
13
Safety valve
14
Expansion vessel
15
Drain cock
16
Recirculation pump
17
Non-return valve
18
Thermostatic mixing valve
ATTENTION
• Water can drip from the dis-
charge pipe of the overpres-
sure device; leave this pipe
open to the atmosphere.
• The decompression device
must be operated regularly
to remove limescale depos-
its and to check that it is not
blocked.
• Connect a rubber hose to the
condensate drain, taking care
not to force too much so as
not to break the drain hose
itself.
6.7.1 Condensate drain connection
The condensate forming during heat pump operation flows
through a special drain pipe (½”) that runs inside the insulation
casing and comes out the bottom of the equipment (fig. 57).
It must be connected to a duct so that the condensate can flow
regularly (example of installation fig. 58).
fig. 57- Example of condensate drain connection without a trap
