135
cod. 3541T620 - Rev. 05 - 04/2022
EN
DORA
90 LT - 120 LT
Data
Smooth
straight pipe
Smooth 90 °
curve
Grille
UM
Type
Effective
length
1
\
\
m
Equivalent
length
1
2
2
m
• While operating, the heat pump tends to lower the tempera-
ture of the room if the air is not ducted outside.
• A suitable protection grille must be fitted during installation
near the external air exhaust pipe, to prevent foreign bodies
from getting inside the device. To ensure maximum product
performance, the grille must be selected from those with low
pressure loss.
• To prevent the formation of condensate: isolate the air ex-
haust pipes and the ducted air cover attachments with a
vapour proof thermal coating of a suitable thickness.
• If necessary, install mufflers to prevent noise due to the air
flow. Fit the pipes, wall entries and connectors to the heat
pump systems with vibration damping.
ATTENTION
Operating an open-chamber
hearth (e.g. open fireplace) and
the heat pump at the same time
will cause a dangerous drop in
pressure in the room.
The negative pressure can cause the return of
exhaust gases into the room.
• Do not operate the heat pump together with
an open fireplace.
• Only operate fireplaces with airtight cham-
bers (approved) with separate combustion
air ducting.
• Keep the doors of the boiler rooms sealed
and closed which do not share the flow of
combustion air with the living spaces.
6.7
HYDRAULIC CONNECTIONS
• Connect the cold water supply line and the outlet line to the
appropriate connection points (fig. 33).
fig. 33
The table below shows the characteristics of the connection
points.
Ref.
Model
90 LT - 120 LT
UM
1
Cold water Inlet
1/2”G
“
2
Hot water outlet
1/2”G
“
6
Condensate drain (*)
16
mm
ATTENTION
For the correct operation of the
device, the inlet water pressure
must be:
- maximum 0.7 MPa (7 bar);
- minimum 0.15 MPa (1.5 bar).
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.