PB Heat Peerless Combi 160, User Manual

Page: 76 / 107

76
12.12 - 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 satisfi ed, the circulator
pump continues to run for 1 minute;
b - DHW delay: each time the
domestic hot water demand is
satisfi ed, 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 01 alarm is generated.
This function is only for boilers set
up to provide instantaneous DHW.
12.11 - Boiler
switch settings
The control board shown in fi gure
1, item “14”, and fi gure 21, contains
a series of switches that allow the
boiler to be confi gured 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
comes on. Boiler is built in with its
own by-pass valve (see fi gure 2, item
“15”, against any closed zone vale). 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 13.10 and 13.11.
12.15 - Display
in energy saving
mode
If desired, the display, items “1” and
“2” in fi gure 62, 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 12.17
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 functioning state,
except when providing domestic
water, every time the burner stops,
there is a delay time of 3 minutes
before the burner restarts again.
12.13 - 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.
12.14 - Freeze
protection
CAUTION!!! For the freeze
protection function to work, the
boiler must remain connected to
the electrical and gas supplies with
knobs “7” and “11” in fi gure 62, in
the OFF position.
CAUTION!!! Improper
setting of these switches could
cause the boiler to malfunction
resulting in improper system
performance. Only a qualifi ed
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. Range from 86°F (30°C) up to 176°F (80°C)
ON Low temperature heating service. Range from 68°F (20°C) up to 113°F (45°C)
7 OFF Boiler confi guration change, disabled
ON Boiler confi guration 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)