Lochinvar EFW 85 Installation, Commissioning, User And Maintenance Instructions page 62

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 water heater safety loop will be extended with the CO detectors by connect-
ing the N.C. contacts in series to the safety switch terminal connections 26/27 or 28/29 on the water 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 EFW water heater.
Fuse
Phase
Neutral
CO detector
2
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 water heater and check if power mode 2 is switched on (parame-
ter 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.
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CO detector
2
Relay
Heater 1 = Managing
Heater 2 = Depending 1
Heater 3 = Depending 2
Heater 4 = Depending 3
E93.1804.014
230 Vac
Wire used to activate other detectors
230Vac Relay
Heater 1 Heater 2 Heater 3
Connect N.C. to safety switch contact
Heater 4