Cranborne THI 10-50c, Installation, Commissioning And Servicing Instructions

Page: 46 / 66

- 47 -
COMMISSIONING
5 - SETTING THE MAXIMUM POWER IN HEATING MODE
The maximum power of the boiler in heating mode
can be limited. This operation requires modification
of the PHz parameter in the boiler's LMU manage-
ment unit.
Access to the PHz parameter is possible via the
QAA 73 ambient temperature sensor (line 541) fol-
lowing the access mode defined in § 3 - page 43 -
chapter V - SETTINGS OF THE INSTALLATION
TYPES.
The PHz value should be selected by following the
diagram below. Adapting the boiler's maximum hea-
ting power to the maximum power of the installation
helps avoid heavy loads during reheating phases
and thus reduces the maximum sound output of the
boiler.
6 - VERIFICATIONS PRIOR TO COMMISSIONING
- Ensure that the installation has been issued with
a certificate of conformity granted by an approved
organisation (according to the installation stan-
dards),
- Check that the boiler is adequately adapted to the
gas used,
- Check that the boiler is filled with water and under
pressure (1.5 bar) and there are no leaks,
Never let the pressure drop below 1
bar.
- Check that the electrical connections of the boiler
are correct: 230 V, 50 Hz, earth connection com-
pliant, polarities correct,
- Check that the combustion products outlet is cor-
rectly assembled, that there are no leaks and no
obstruction,
- Check that the heating system ventilations are
not obstructed,
- Check that the siphons are filled with water,
- Check that the condensate outlet is connected
properly and there are no leaks.
7 - USER INFORMATION
The heating engineer must inform the user about
the unit’s operating mode. In particular the user
must be informed about the function and the opera-
tion of the safety systems and the need for regular
servicing by a qualified person.
Fig. 43
THi 10-50 heat input depending on PHzMax setting (parameter 541 QAA73)
10
15
20
25
30
35
40
45
50
10 20 30 40 50 60 70
PHzMax %
H
ea
t input
k
W
T
HRi
10-50 P
H
z
!