Instruction manual

48
12.6 - Delays,
alarms and
protective actions
To protect the life of the appliance,
improve comfort, and maximize energy
savings, the following timings have
been incorporated into the control
logic:
a - Pump delay: each time the room
thermostat is satisfied, the circulator
pump continues to run for 1 minute;
b - DHW delay: each time the
domestic hot water demand is
satisfied, a 2 minutes delay must
pass before the heating service is
allowed to restart;
c - Protection against legionnaires
bacteria: if the boiler is connected to
a DHW storage tank the boiler will
increase the tank temperature to
140 °F (60 ° C) every seven days,
prevent the formation of legionnaires
bacteria. This function is displayed
by .
d - DHW alarm: if the call for domestic
hot water lasts for longer than two
hours, an alarm is generated.
This function is only for boilers set
up to provide instantaneous DHW.
12.5 - Boiler switch
settings
The control board shown in figure 1,
item “14”, and figure 22, contains a
series of switches that allow the boiler
to be configured to match the
application. The table below lists each
switch and its corresponding funtions.
Once the boiler has reached a
temperature of 45 °F (7 ° C), the
heating pump will automatically come
on. If the temperature falls below 35 °F
(2 ° C), the burner will light to prevent
the boiler from freezing.
If the boiler will not be used for more
than a year it should be drained per
sections 13.11 and 13.12.
12.9 - Display in
energy saving
mode
If desired, the display, item “31” in
figure 1, can be switched permanently
off, with the exception of when it
displays errors or settings. To switch
the display off, access the “Installers’
Menu”, in section 12.11 and set the
parameter at a value other than zero.
Keep in mind that each value will
correspond to a delay in minutes until
the display goes into Energy Saving
mode.
12 - USE
e - Time delay in restarting the burner:
in its normal functing state, except
when providing domestic water,
every time the burner stops, there is
a delay time of 3 minutes before the
boiler restarts again.
12.7 - Circulator
pump and three
way valve
protection
During the summer months, the
circulator is run once a day for around
15 seconds to prevent it from seizing.
At the same time, the three way valve
(if present) is activated for the same
reason.
12.8 - Freeze
protection
CAUTION!!! For the freeze
protection function to work, the
boiler must remain connected to
the electrical and gas supplies with
knobs “32” and “33” in figure 1, in
the OFF position.
CAUTION!!! Improper setting
of these switches could cause the
boiler to malfunction resulting in
improper system performance.
Only a qualified technician, with an
in-depth knowledge of the boilers’
control system, should change
them.
SWITCH Position Description
1 OFF Boiler with production of instantaneous D.H.W.
ON Boiler with production of D.H.W. via storage tank
2 OFF Boiler with production of instantaneous D.H.W.
ON Position not available for this series of boilers
3 OFF Heating pressure switch, Low Water Cut Off, disabled
ON Heating pressure switch, Low Water Cut Off, enabled
4 OFF EBM PAPST brand fan
ON FIME brand fan
5 OFF Combination boiler for heating and D.H.W.
ON Boiler for heating only
6 OFF High temperature heating service, 86°F (30°C) and 176°F (80°C)
ON Low temperature heating service, 68°F (20°C) and 113°F (45°C)
7 OFF Boiler configuration change, disabled
ON Boiler configuration change, enabled
8 OFF Maximum heating supply water temperature of 176°F (80°C)
ON Maximum heating supply water temperature of 189°F (87°C)