Mandik CPV Installation, Commissioning And Maintenance page 42

MANDÍK CPV Installation, commissioning, and maintenance
The operating and alarm thermostats must always be properly connected to the control
system. The thermostats are wired in series and the contacts are closed at safe air
temperatures inside the heater. When the contacts open, the electric heaters are forced to
disconnect. The operating thermostat resets automatically once the heater has cooled, but
the alarm thermostat must be reset manually. The temperature must fall back below the
setting on the thermostat after the thermostat overheats to permit manual reset of this
safety circuit. Elimination of the source of such overheating is required to restart the heaters.
The operating thermostat is set to ~50°C within the air stream as standard, while the alarm
thermostat is set to a temperature of ~80°C in close proximity to the heaters as it is affected
by the radiant heat from the heating elements.
Heater electrical connections are specified in the provided "MANDÍK Controls"
documentation.
The airflow velocity inside the active cross-section of the unit may not be less than 1 m/s as
the heating elements will overheat. For units with variable airflow, it is necessary to set the
minimum speed higher than this required airflow velocity.
IZU 06/2021 MANDÍK, a.s., www.mandik.cz
DIN RAIL WITH TERMINALS
ALARM THERMOSTAT
OPERATING THERMOSTAT
SSR RELAYS
LOCATION OF THE ALARM THERMOSTAT AT
REST.
THE RED RESET BUTTON MUST BE PUSHED
IF A MALFUNCTION OCCURS
SWITCHING TEMPERATURE ADJUSTMENT
ON THE OPERATING THERMOSTAT
SWITCHING TEMPERATURE ADJUSTMENT
ON THE ALARM THERMOSTAT
R
42