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General safety instructions for connecting electric heaters
Interlocking with the fan
The operation of the electric heater must be interlocked with air draught or air pressure created by the fan. Any deliberate or
accidental shutdown of the pulse unit must result in power being cut off to the heating elements.
It is imperative that a delay mechanism preventing the fan being turned off before the coil is shut down be fitted. The heating
elements must be allowed to cool down for a period of 10 to 15 minutes depending on the output of the heater.
We recommend installing a control circuit with a maximum of 48 Volts.
If the fan is equipped with a two-speed motor, the control circuit must be wired such that any reduction in air flow immediately
causes a proportional reduction in the output of the heater, i.e.:
Example:
1500/750 rpm motor
Heater output: 60 kW
At low speed, the heat dissipated by the heater must not exceed 30 kW.
Overheating protection
The heater is equipped with a manual reset thermostat. This thermostat must always be fitted at the top of the air outlet.
It must be connected as shown in the diagram opposite before attempting to start up the system.
A number of reasons can cause the electric elements to overheat and trigger the thermostat.
They include:
•
Turning on the heater while the fan is off
•
Partial clogging of the filter
•
Fan direction of rotation reversed (frequent on start-up)
•
Incorrect positioning of the inlet or outlet dampers
•
Fan drive belts too slack
Electrical connections
Always comply with general safety instructions, and prevailing standards (e.g. NF C 15-100 on low-voltage electrical
installations) in particular, when making electrical connections.
Make the electrical connections to the terminal blocks provided and to the terminals of the manual reset thermostat
located inside the section. Each stage (output – connection terminals) is identified by a label of the same colour:
Power Ph1 Ph2
Ph3
There are three sets of these labels, one per stage. Each label has the same colour as its corresponding stage.
1. Cas général avec une batterie
SG : Sectionneur général
INT : Interrupteur MIA
FV : Sect. fusible vent.
K1 : Relais temporisé
KV : Contacteur vent.
FTV : Relais thermique
