Cascade System Aeraulic Connections; Special Installation - Ferroli EGEA TECH 200 HT Manual

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 boiler rooms sealed and
closed so that the combustion air is not
drawn from living areas.

8.6.2 Cascade system aeraulic connections

The simultaneous operation of
an open chamber fireplace (e.g.
open fireplace) and of the heat
ATTENZIONE
pump causes a dangerous nega­
tive pressure in the environment.
Compulsory
air inlet
D
Ø
1
fig. 53 ­ Example of air discharge connection
n° units 2
D [mm] 200
Nota:
Over 4 units (max 8), consider two separate ducts referring to
the diameters in the table relating to the number of units con-
nected in parallel.
Example with 7 units:
• No. of units connected in parallel on the first duct:
4 → ØD = 300 mm
• No. of units connected in parallel on the second duct:
3 → ØD = 250 mm
To avoid air recirculation it is mandatory to install a non-return
valve (part.1 fig. 53) on the air expulsion duct of each unit.
EN
172
Scomparto
INTERNAL
interno
>1%
1 1
fig. 54
3
250
cod. 3540000420 - Rev. 03 - 09/2023
EGEA TECH

8.6.3 Special installation

One of the peculiarities of the heat pump heating systems is that these units
considerably lower the air temperature, generally expelled to the outside of
the house. As well as being colder than the ambient air, the expelled air is
also completely dehumidified, therefore the air flow can be returned inside
for the summer cooling of specific rooms or areas.
Installation provides for splitting of the extraction pipe, which is fitted with two
dampers ("A" and "B") for directing the air flow to the outside (fig. 56) or the
inside of the house (fig. 55).
fig. 55­ Example of installation in the summer period
4
300
200 HT - 260 HT
Mandatory air
inlet D.160 mm
Damper "A" Damper "B"
closed open
Internal
compartment