Data Sheet

I-2018, www.findernet.com
7
G
7H
SERIES
7H SERIES
Heaters (10...550)W
Wiring diagrams
7H.11.0.230.1010 or
7H.11.0.230.1020
7H.11.0.230.1050 or
7H.11.0.230.1100 or
7H.11.0.230.1150
7H.12.8.230.1150 or
7H.12.8.230.1250 or
7H.12.8.230.1400
Example: Type
7T.81.0.000.2403
Example: Type
7T.81.0.000.2403
Example: Type
7T.81.0.000.2403
If the preset temperature is undershot, the heater turns on
and when crossing the heater turns off.
Application notes
Heating element:
The heating element of the heater is a thermistor (PTC resistance). This
thermistor is a temperature-dependent resistor of semiconducting,
polycrystalline ceramic material (e.g. barium titanate, BaTiO3
3
).
PTC resistors= (Positive Temperature Coefficient) consist of conductive
materials that can conduct electricity better at low temperatures than at
high temperatures. Their electric resistance grows as temperature rises.
Functionality of a PTC when turned on:
The cold resistance of a PTC is 100 Ω (at +20 °C). The current flowing
through the PTC heats it up. The temperature of the resistor rises
to a maximum of +120 °C (the Curie temperature) while its current
consumption simultaneously drops. The result is a self-regulating,
temperature limited heating system.
Position of installation:
The position of installation of the heater is vertical (air flow direction), air
outlet: upwards, electrical connection: on the bottom.
The air outlet grille may not be covered.
Installation note:
Above the heater is a safe distance of 120mm (with fan heater 150mm) as
well as on the side of 20mm (with fan heater 50mm) and the mounting
should not be carried on easily inflammable material (wood, plastic).
Overheating protection: (Type 7H.12.8.230.1475/1550)
If a fan fails the overheating protection switched off the heater
at +80°C (bimetal).
The automatic reset at the heater switch on again when it falls below a
certain temperature.
Advantages:
- Self-regulating
characteristic
- No risk of overheating
- Fast heating
Disadvantages:
- High peak current
(max. 15A for the heater
with 400W heating power)
Fan:
Heaters with a heating power from 150W (Type 7H.12.8.230.1150) are
equipped with a fan. The fan consists of a ball bearing-mounted axial fan
with different air volume of (13.8…45)m
3
/hr depending on the type.
The fan ensures even temperature control in the cabinet and housing.
The connection of the fan takes place by an internal terminal in the
heaters.
Touch-safe principle:
The heaters are located in a plastic housing.
Since the surface temperature of the heaters can be up to +85°C the
plastic housing provides protection against burns (Touch-safe).
Please see general technical information