Onnection - Ariston NUOS FS 200 Instructions For Installation And Servicing

6.12 FSi 250 I
NDIRECT
B C
OILER

ONNECTION

Note:
Where secondary return circuits
are used an additional expansion
vessel may be required.
F . 6.12 NUOS FSi 250
IG A
30
The NUOS FSi 250 has an indirect coil that is intended for connection to a
C
OIL
water heating system, such as a boiler as shown below.
A manual reset overheat stat is supplied fitted to the NUOS.
This stat should be wired so that in the event of over temperature in the
NUOS's hot water system the thermostat breaks the electrical supply to
the motorised valve which in turn mechanically closes preventing primary
water entering the coil.
The overheat setting for the stat should be set at a maximum temperature
70°C.
T B
WITH YPICAL OILER
1. NUOS FSi 250
2. Boiler
3. Heating System
4. Motorised Valve
5. NUOS FSi 250 Indirect Flow
6. NUOS FSi 250 Indirect Return
C
ONNECTION
NUOS Indirect Flow
¾” BSP Male
NUOS Indirect Return
¾” BSP Male