48
16.2.3
CH OFFSET
The CH offset parameter sets how many degrees above the setpoint temperature the boiler will go before shutting
down.
The offset can be adjusted using the
Up
and
Down
buttons on the control panel. Once the desired offset is
displayed, the
Enter/Reset
button should be pressed to store the value. The default value is 5
C, the minimum value
is 0
C and the maximum value is 30
C.
16.2.4
CH DIFFERENTIAL
The CH differential is the number of degrees the water temperature must drop in before the boiler will fire again. If for
example the setpoint is 81
C, the offset is 5
C and the differential is set at 10
C, the boiler will operate until the flow
temperature reaches 86
C, shut down and not re-fire until the temperature drops below 76
C.
The differential can be adjusted using the
Up
and
Down
buttons on the control panel. Once the desired differential is
displayed, the
Enter/Reset
button should be pressed to store the value. The default value is 10
C, the minimum
value is 0
C and the maximum value is 30
C
16.3
MENU SET D FUNCTIONS
16.3.1
RESET LAST 10 ERRORS
The last 10 errors logged can be cleared using this parameter. To carry out this function, the
Enter/Reset
button.
16.3.2
SERVICE MODE DELAY
By pressing the pin button on the front of the display for five (5) seconds, the control will be placed in Service Mode.
This will override all other heat demands. The Service Mode allows the installer to set the unit to either maximum
firing rate or minimum firing rate for the purpose of combustion analysis. The delay sets the length of time the boiler
will stay in the Service Mode if no keys have been pressed before going back to its original state. The time range of
this parameter can be adjusted between 0 and 40 minutes using the
Up
and
Down
buttons. Once the desired time
period has been set, the
Enter/Reset
button should be pressed to store the value. The default time delay is 20
minutes.
16.4
MENU SET E DHW SETTINGS
16.4.1
DHW SETPOINT
When a DHW call for heat becomes active, the control will use the DHW setpoint to determine the firing rate of the
boiler based on the outlet temperature. The desired temperature can be adjusted in ½
increments using the
Up
or
Down
buttons and the desired value stored by pressing the Enter/Reset button. The temperature range of this
parameter is 0
C to 100
C. The default value is 81
C.
16.4.2
CH/DHW SWITCHING TIME
The CH/DHW switching time parameter sets the length of time the control will stay in DHW Mode when a CH call has
been received. After this time period has expired the control will revert to CH Mode. If a DHW call is still active the
timer will reset. After the time period has expired the control will revert back to DHW Mode. This will continue until
one of the demands has been satisfied.
The time range of this parameter can be adjusted between 0 and 240 minutes using the
Up
and
Down
buttons. Once
the desired time period has been set, the
Enter/Reset
button should be pressed to store the value. The default time
delay is 30 minutes.
