47
The draining of the heating system must be carried out as follows:
-
Turn off the boiler and the bipolar switch;
- Loosen the automatic air release valve;
-
Open the system's discharge valve
-
Empty out from the lowest points of the system (where
provided).
If the system is to be left active in areas where the room
temperature may go below 0°C during winter, it is recommended
that anti-freeze liquid be added to the water in the heating system in
order to avoid the need for repeated draining.
Draining the domestic hot water system
Every time that there is a danger of freezing, the domestic hot water
system must be drained as follows:
-
close the water mains stop-cock;
-
open all the hot and cold water outlets;
-
empty out from the lowest points (where provided).
3.12
D
RAINING
3.11
C
OMPLETION
D
AILY
T
EST
.
In order to prevent sticking components, the boiler carries out a self-
diagnosing test every 21 hours: the pump runs for 15 seconds and
the diverter valve moves once.
A
NTI
-
FROST
D
EVICE
.
The anti-frost function acts on the central heating flow temperature
probe, independently from other regulations, when the electrical
supply is turned on.
If the primary circuit temperature falls below 8°C the pump will run
for 2 minutes.
After the two minutes of circulation (fixed) the boiler will check the
following:
a) if the central heating flow temperature is > 8°C, the pump stops;
b) if the central heating flow temperature is between 3 and 8°C, the
pump will run for another two minutes;
c) if the central heating flow temperature is < 3°C, the burner will fire
(heating position) at minimum power until the temperature reaches
33°C, the burner will go out and the pump will continue to run for two
minutes.
If the flow temperature remains between 3-8°C the pump will
continue to run for two minutes for a maximum of 10 times unless a
temperature above 8°C is detected in the central heating flow, after
this the the burner will fire.
If lockout is caused by overheat the burner is kept OFF.
N
OTE
:
In all cases, the circulation takes place in the central
heating system.
The anti-frost device activates only when (with the boiler
operating correctly):
- the system pressure is correct;
- the boiler is electrically powered;
- there is a supply of gas.
A
NTI
-
SCALE
D
EVICE
.
When producing domestic hot water, the burner shuts off
whenever the output temperature of the hot water exceeds
61°C or the flow temperature of the primary circuit exceeds
78°C. It will not turn on if the temperature of the primary circuit
is greater than 78°C.
For the Republic of Ireland it is necessar y to complete a
“Declaration of Conformity” to indicate compliance to I.S. 813. An
example of this is given in the current edition of I.S. 813. In addition
it is necessary to complete the commissioning checklist
(Section 11, page 78).
Summary of Contents for ACO 27 MFFI
Page 49: ...49 WIRING DIAGRAM FOR CONNECTION TO AN ARISTON UNVENTED CYLINDER DIAGRAM A ...
Page 50: ...50 WIRING DIAGRAM FOR CONNECTION TO AN OPEN VENTED CYLINDER DIAGRAM B ...
Page 57: ...57 FIG 7 19 FIG 7 20 FIG 7 21 FIG 7 22 FIG 7 23 FIG 7 24 O P FIG 7 18 ...
Page 69: ...69 Model 27 32 RFFI SYSTEM ...
Page 70: ...70 ...
Page 71: ...71 ...
Page 77: ...77 ...
Page 78: ...78 11 BENCHMARK COMMISSIONING CHECKLIST ...
Page 79: ...79 12 SERVICE INTERVAL RECORD ...
