Component descriptions EL and HW units (cont'd.)
Position
Description
9
Electrical connection box
10
Mounting brackets
11
Inspection doors
2.3 Heat Exchanger
This unit is equipped with a high efficient rotating heat exchanger. Required supply air temperature is
therefore normally maintained without adding additional heat via the built in re-heater battery (water or
electric). The operation of the heat exchanger is automatic and depends on the set temperature. The heat
exchanger is removable for cleaning and maintenance.
2.4 Heater Battery
The unit has a built in heater battery (water or electric). The operation of the heating battery is automatic
and dependent on the set temperature.
2.5 Electrical Heater
The heating rods are located in the heater beside the supply air fan and the material is stainless steel.
The electric heating coil has both automatic and manual overheating protection. The manual overheat
protection is reset by pushing the red button on top of the electrical heater frame (pos.8, figure 3 ). The
power demand of the electric heating coil is controlled by a triac power regulator (Pulser) according to the
desired supply/extract or room air temperature that is set in the control panel.
2.6 Hot Water Heater
In HW units the hot water coil is located beside the supply air fan (figure 4. ) The coil is mounted with the
connection pipes projecting from the side of the unit and is therefore easy to connect. The material is
copper piping with a frame of galvanized sheet steel and aluminium fins. The coil has a venting nipple and
an immersion sensor as frost guard. If there is a risk of freezing in the hot water coil, the control valve
is forced open to prevent freezing. If there is still a risk of freezing, the unit is stopped and the outdoor
air dampers (accessory) are closed.
Topvex FR03, FR06, FR08, and FR11
Operation and Maintenance Instructions
206575
4
Systemair AB
