Ariston NUOS FSi 250 Instruções de instalação e manutenção - Página 28
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6.11 FSi 250 I
NDIRECT
S
C
OLAR
ONNECTION
Note:
Where secondary return circuits
are used an additional expansion
vessel may be required.
As the heat pumps condenser
coil is positioned below the
indirect coil, the NUOS 250i does
not have a dedicated solar
volume.
F
. 6.11
NUOS FSi 250
IG
A
28
The NUOS FSi 250 has an indirect coil that is intended for connection to a
C
OIL
water heating system, such as a solar system as shown below.
A manual reset overheat stat is supplied fitted to the NUOS.
For solar installations this stat should be wired so that in the event of
overheating from the solar system the thermostat switches the solar pump
Off, thus preventing flow to the NUOS.
The overheat setting for the stat should be set at a maximum temperature
70°C.
GENERAL GUIDANCE
Current guidance notes do not cover the connection of a solar thermal
circuit to an unvented storage vessel (cylinder). However, if guidance is
sought for compliance with current regulations the fundamental principle
is to provide a failsafe means of shutting off the solar input to the heat
exchanger if the cylinder temperature should rise above the set temperature
of the cylinder's energy cut out. (See Note 1).
As with all unvented hot water systems, notification of intention to install
should be given to your local building control.
Option A. A non self resetting mechanical shut-off should be installed on
the solar primary flow to the cylinder. The mechanical shut-off should be
suitable for use with a solar primary circuit (i.e. high temperature and glycol
resistant). The mechanical shut-off should be integrated electrically with
the cylinder energy cut out/s and if necessary the solar circuit temperature
control, please refer to the solar controller manufacturer for further
information.
Option B. Where the solar controller and hydraulic system demonstrate
that by no lesser means the requirement in Option A is satisfied by other
means; certification by an approvals body is required to demonstrate that
T
S
WITH
YPICAL
OLAR
1. NUOS FSi 250
2. Solar Collectors
3. Solar Pump Unit
4. Solar Controller
5. NUOS FSi 250 Indirect Flow
6. NUOS FSi 250 Indirect Return
NUOS Indirect Flow
NUOS Indirect Return
C
ONNECTION
¾ BSP Male
¾ BSP Male
From Solar
To Solar