E93.1803.901 HW
65
Ad 2. CO detection and switch off module:
Use a CO detection system which has an alarming and switching module. Use a switching module that has an
Normally Closed (N.C.) contact. The heater safety loop will be extended with the CO detectors by connecting the
N.C. contacts in series to the safety switch terminal connections 26/27 or 28/29 on the heater to switch off the
heater in case of an alarm.
Remove the yellow wiring bridge and connect the N.C. contacts in series to the relay(s).
Low voltage connections HW heater.
Use an extra 230V multipole relay (number of poles equal to number of boilers). In case of power failure on the
CO alarm system and modules the boilers will shut down. Mount, install, test and maintain the CO detector ac-
cording to the manufacturer’s instructions. Test the system at least monthly, to ensure the heaters will switch off
in case of a CO alarm.
In case of an CO alarm, the display of the heater
will mention: ‘
Max. thermostat lock error
’.
Ad 3. Use always the cascade manager of the heater and check if power mode 2 is switched on (parameter
148)
Check parameter setting 148. This setting must be ‘
Power mode 2’
. Change the parameter 148 to ‘
Power mode
2’
in case the current setting is different.
See manual §: CASCADE
– POWER BALANCE MODE
Several different power control modes can be selected to operate the cascade system.
• Power mode 0: Power control disabled; each heater modulates based on the system setpoint.
• Power mode 1: Power control algorithm to have a minimum number of heaters/heaters active.
• Power mode 2: Power control algorithm to have a maximum number of heaters/heaters active.
• Power mode 3: Power control algorithm to have a balanced number of heaters/heaters active.
Phase
Neutral
CO
2
detector
CO
2
detector
Relay
230Vac Relay
Connect N.C. to safety switch contact
Fuse
230 Vac
Wire used to activate other detectors
Heater 1
Heater 2
Heater 3
Heater 4
Heater 1 = Managing
Heater 2 = Depending 1
Heater 3 = Depending 2
Heater 4 = Depending 3
Содержание CB 105 HW
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