Meridian 5.24 Installation & Operating Instructions Manual page 36

to the time and temperature reached. It is set to ON for multi-zone
systems controlled by thermostats/programmable thermostats. In this
case, the remote control checks the sanitary water temperature and
displays the operating status.
DIP switch 5: this must be set to OFF. If accidentally set to ON, it causes error F27
DIP switch 6: this must be set to OFF if you want to operate the boiler with the
remote sanitary tank. If you want to use the boiler without the tank, it
should be set to ON and DIP switch 2 to OFF
The following trimmers, which can be accessed by dismantling the control panel, are also
present and do the following:
P4 : maximum fan speed. When controlling and adjusting the boiler, the maximum fan
speed is adjusted here. The rpm will be shown on the central multifunction display.
P2 : minimum fan speed: use this trimmer, located on the PCB (see Fig. 6) to adjust the
minimum fan speed in a range of 1000-2300 rpm. For each boiler, the number of
minimum rpm which must be strictly observed is specified in Tables 7 and 8 in
Chapter 3.7.
P5 : fan speed during ignition. This must be set to approximately three-quarters of the
range
P7 : thermo setpoint or K factor setting with external sensor present. This boiler has a two
temperature (high/low) control system with separate settings Therefore, a flow
temperature at 40° C and one at 60° C is possible to meet a request from the low
temperature or high temperature system. The temperature in the main zone is
adjusted on the front heating potentiometer whereas the temperature in the other
zone is adjusted on potentiometer P7.
P7
P5
P2
P4
Posizione trimmer
3.2.1 Fan rotation speed
The fan rotation speed can be checked on the front boiler display.
Fan rotation speed table.
Models
5.24
5.32
See paragraph 3.3.1 for methods of adjustment.
NATURAL GAS
Min rpm Max rpm
1250 4700
1500 5500
Ignition
Min rpm
rpm
3700
N/A
3500
1900
36
Fig 16
PROPANE GAS
Ignition
Max rpm
rpm
N/A
N/A
3500
5500