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Edition: 06 / 2015 Page 35 / 146
VARMAX - Installation, Use and Maintenance
U0501961-#
3 tappings
VARMAX boilers are tted with 2 returns and an
optimised internal water circuit allowing effective
separation of high temperature returns (coming
from DHW preparation circuits, radiators, etc.)
from low temperature circuits (under oor heating
circuits, low temperature radiator circuits, etc.).
This circuit separation encourages the
condensation of ue-gases in the lower part of
the condenser throughout the year, and therefore
considerably increases the boiler's performance.
To use the 2
nd
return, the clamp obstructing the
tapping must be removed.
4.11.2. Boiler with 4 tappings
VARMAX boilers are tted with 2 internal water
circuits allowing separation of high temperature
returns (coming from DHW preparation circuits,
radiators, etc.) from low temperature circuits
(under oor heating circuits, low temperature
radiator circuits, etc.).
In some installations, additional improvement
may be obtained using 4 tappings. This separates
the condenser (low temperatures) from the main
exchanger (high temperatures).
There are no throughput constraints regarding the
condenser.
!
WARNING:
Do not connect DHW (domestic hot water) or swimming pool water to
the condenser circuit.
gure 25 - Connection with 3 tappings
gure 26 - Connection with 4 tappings
Flow
2
nd
return
hot return (high tem-
perature circuit)
1
st
return
cold return (under oor
heating and low
temperature radiators)
Main exchanger
ow
Condenser return
Condenser ow
main exchanger
return
U0501961-#
35


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