9
Temperature (
o
C)
Resistance (k
?
)
0.................................................................27.21
5.................................................................22.02
10................................................................17.92
15................................................................14.67
20................................................................12.08
25................................................................10.00
30................................................................8.315
35................................................................6.948
40................................................................5.834
45................................................................4.917
50................................................................4.161
55................................................................3.565
60................................................................3.014
65................................................................2.586
70................................................................2.228
75................................................................1.925
80................................................................1.699
85................................................................1.452
90................................................................1.268
95................................................................1.110
100..............................................................0.974
On board adjustments: potentiometers and trimmers.
MAX RISC:
maximum heating mode trimmer, 0 -100 %.
0 % corresponds to the minimum value mechanically set on the MFC: 30 mA with NG, 50 mA with LPG. To set
MAX RISC to minimum, turn it counter-clockwise. To increase the maximum heating value, turn it clockwise.
RLA:
step opening level trimmer, 0 -100 %.
When the RLA trimmer is put to the very minimum by turning counter-clockwise, the step opening duration is
forced to 20 s. in order to help the setting operation. The 3 minute delay is cancelled. By turning clockwise, step
opening duration is increased. Factory setting is 100%. Do not change its setting.
On board adjustments: jumpers.
JP l:
NG/LPG. When fit in, the modulating current range varies from 30 – 230 mA (NG) to 50 -310 mA (LPG)
JP 2:
when fit in, the pump is not powered when working in Heating mode. This feature addresses to systems
with external pumps.
JP 3:
when fit in, the heating temperature range changes to 30 – 40
o
C, for underfloor systems.
JP 4:
when fit in, the three minute delay on restarting after a cut-out due to the primary water temperature set
being exceeded, is excluded.
Setting the maximum heating temperature
The maximum heating temperature can be preset at
commissioning stage to suit the type of heating system.
For example, for use with underfloor heating, the maximum
heating temperature can be set to 40oC. To adjust the maximum
temperature, proceed as follows:
?
Remove the jumper cap from the rear of the control panel
to gain access to jumper JP3 (see diagram A).
Note: To adjust the maximum heating temperature it is only
necessary to fit JP3.
DO NOT touch any other jumpers.
?
Refit the jumper cap.
JP 3 is fitted ? 40oC. Maximum.
JP 3 is not fitted ? 90oC. Maximum.
Factory setting 90oC. Maximum.
Diagram A
JP4
JP3
JP2
JP1
MAX RIS
RLA
