34
DRAINING THE HEATING SYSTEM
The heating system m
ust be drained as follows:
- Turn off the boiler;
- Attach a hose pipe and open the drain valve;
- Drain the system at the lowest points (where present).
When the heating system is unused for an extended
period of time, it is recommended that you add
antifreeze with an ethylene glycol base to the water in
the heating pipe work and radiators if the ambient
temper
ature drops below 0°C during the winter.
This mak
es repeated dr
aining of the entire system
unnecessary.
DRAINING
THE
DOMESTIC HO
T
WA
TER
SYSTEM
Whenev
er there is the danger of the temper
ature
dropping below the freezing point, the domestic hot
w
ater system must be drained as follows:
-
T
ur
n off the gener
al w
ater valve for the household
plumbing system;
- Turn on all the hot water taps;
-
Empty the remaining w
ater from the lo
w
est points in
the system (where present).
3.8 DRAINING THE SYSTEM
AN
TI
-F
ROST DEVICE
:
T
he boiler is equipped with an anti-frost device which,
operates in two ways depending on the water temperature:
Temperature @ Flow Sensor below 8
o
C;
The pump will run at speed 2 for 2 mins (1 minute in CH
and 1 minute in DHW).
A
fter 2 minutes the PCB will check the temperature at the
R
eturn Sensor, should the temperature be 8
o
C
or higher
the boiler will return to stand-by.
Should the temperature remain between 5
o
C & 8
o
C the
pump will continue to operate for a further 2 minutes, with
the diverter valve switching between CH and DHW as
before, this will continue for a maximum of 10 minutes,
after 10 minutes of this operation the burner will fire at
minumum power until the Return Sensor reads a
temperature of 33
o
C, there will then be 2 minutes of pump
over-run in the DHW circuit.
Temperature @ Flow Sensor below 5
o
C;
The burner will fire at minimum power in CH until the
Return Sensor reads a temperature of 33
o
C, once
achieved there will be 2 minutes of pump over-run in the
DHW circuit.
NO
TE
:IN
THE EVENT OF FLAME FAILURE
, A
ND THE TEMPERATURE
IS BELOW
5
O
C THE PUMP WILL OPERATE FOR 2 MINS
(1 MIN CH AND 1 MIN DHW).
This device only operates if the boiler is functioning
perfectly and:
- the system pressure is sufficient;
- the boiler is powered electrically;
- the gas is turned on.
PUMP /DIVERTER VALVE PROTECTION:
To prevent the pump and diverter valve from siezing the
boiler will activate the pump for 20 seconds every 21 hours
after it’s last operation and activate the diverter valve once.
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