Ariston 200D, Instructions For Installation, Use, Maintenance

Page: 11 / 32

11 / EN
HYDRAULIC CONNECTIONS
WARNING: No valves must be fitted between the combination
valve and the product.
WARNING: No valves must be fitted from the combination valve to
expansion vessel or PRV discharge
.
The combination valve can be installed in any orientation.
The pipework must be flushed prior to fitting the valve to avoid dam-
age to the valve.
COMBINATION VALVE
EXPANSION VESSEL INSTALLATION
DON NOT install expansion vessel vertically with connection at the
bottom (A). DON NOT connect via a vertical pipe above the combina-
tion valve (B). DON NOT use flexible houses (C).
Installing EV incorrectly can use air to become ytapped in the expan-
sion vessel resulting in potential nuisance vibration through the Nuos
and pipework.
WATER CONNECTIONS
TPR
The appliance must not operate with water hardness levels below
12°F; on the other hand (>25°F), it is advisable to use a suitably cali-
brated and monitored water softener in the event of particularly hard
water; in this event, the residual hardness must not fall below 15°F.
The 250I version has an indirect coil that is intended for connection
to a water heating system, such as a solar system as show below.
A manual reset overheat stat is supplied fitted to the product.
For solar installations this stat should be wired so that in the event of
over heating from the solar system the thermostat switches the solar
pump of, thus preventing flow to the product. The overheat setting for
the stat should be set at a maximum temperature 70°C
The 250I version coil has two ¾”G couplings, upper (inlet) and lower
(outlet), on which to connect an auxiliary source.
WARNING! It is advisable to carefully wash the system’s pipes
in order to remove any residues of screw thread, welding or dirt
which may hamper the correct operation of the appliance
.
WARNING!
Hot water at temperature above 50°C running from the taps may immediately cause
serious burns. Children, the disabled and the elderly run a greater risk in this regard.
Therefore it is advisable to use a thermostatic mixing valve connected to the water
outlet or where preferred at the point of use.
S3
MAX 75°C
S4
MAX 75°C
S2
MAX 75°C
75°C
250I
25 N m MAX
(2.5 kg m)
1 2 1 2 1 2
A B C
IN
OUT
1
2
A
B
C
S3
MAX 75°C
S4
MAX 75°C
S2
MAX 75°C
75°C
250I
25 N m MAX
(2.5 kg m)
1 2 1 2 1 2
A B C
IN
OUT
1
2
A
B
C
In the event of connection of 250I version to the boiler/stove,
it is advisable to use sensor slot S2.