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Ventilation units with heat recuperation
24
®
DUOVENT
5.2.3 ELECTRIC HEATER CONNECTION (MARKED "DI" IN UNIT CODE)
The unit equipped with an electric DI heater is connected to the relevant control system and further to the electrical network. The general safety
regulations for the assembly and installation of electrical equipment apply to this equipment. On the front of the unit there is a cover with a
release button for the non-automatic thermal fuse. The non-automatic thermal fuse reacts in the event of overheating of the heater's heating
block (temperature above +120 °C). The electric heater is also equipped with an operating thermostat with automatic reset (set temperature is
+60 °C, when it is exceeded, the operating thermostat opens and switches off the heater, after cooling below +60 °C the heater automatically
switches on again).
Location of the release button under the cover on the outer casing of the operating side of the unit:
If the electric heater emergency thermostat of the unit trips again, it is necessary to immediately look for the cause of the fault. Repeated manual
reset of the heater overheating error by a button on the heater is inadmissible and is not a solution to the fault. The reason for this type
of failure may be insufficient air flow through the electric heater of the unit, which will cause the heating rods to overheat and the intervention of
the emergency thermostat. The solution is to increase the air flow to the required minimum level according to the following table.
Table of minimum air flows through the electric heater:
Size unit
DV/RV 8500
DV/RV 10100
DV/RV 12000
DV/RV 14500
CAUTION!
Before service works!
!
• The unit must be disconnected from the power supply
•
The fan impellers shall not rotate
•
Electric heater bars must be cooled to min. 30 °C
•
The unit service switch is locked in OFF position
CAUTION!
It is forbidden to remove, bypass or disconnect safety
!
devices, safety functions and protective devices! Any
intervention in the internal connection of the heater is
forbidden!
CAUTION!
In case the unit is not fitted with Digireg
!
power supply by means of a safety contactor, which should be connected in series with the emergency and operation
thermostat of the electric heater and with the fan running detection element (such as manostat). In any case may the the
electric heater started without running the fan, which provides minimum air flow at the heater!!!
MODULAR DV/RV
3
Minimum air flow (m
/h)
5000
5500
6000
6800
®
control box from the factory, it is necessary to ensure blocking of the electric heater
CAUTION!
In case the unit is not fitted with Digireg
!
from the factory, it is necessary to ensure minimum run-
down of inlet fan after stopping of the electric heater to
cool the heating bars. Min. run-down time is 4 minutes.
®
control box
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