19
During maintenance, it is necessary to check the tightening of the terminals, clean the space of the heater terminal block from dust and dirt,
monitor whether some components show signs of excessive warming, water leakage, mechanical or other damage. Increased attention must be
paid to safety circuits, especially the thermal protection of the heater, including the correct response of the control system or power supply
switchboard. Faults found must be rectified immediately. These inspections are carried out at least once a year (or more often according to local
conditions) by an authorized professional service company.
Example of connection of the two section electric heater terminal block:
SAFETY THERMOSTAT
AUTOMATIC RESET
EMERGENCY THERMOSTAT
MANUAL RESET
Connection terminal block is accessible after removal of the heater front cover.
5.2.4 WATER HEATER CONNECTION
The unit fitted with the water heater (unit code DCA or DCB) is connected to the heating media by means of three-way mixing unit (see
"Types of ESU control units"). The water heater outlets are located on the front of the unit and are threaded. The exchanger must be connected
in counter-current to the flow of air passing through (in concurrent connection, the exchanger loses approx. 25% of its output). When tightening
the heat exchanger connections, it is necessary, for example, to hold the heat exchanger neck with a second wrench so that the tightening
torque is not transmitted to the heat exchanger body.
Table of dimensions of water cooler connection necks:
Size unit
heater/cooler type
thread
6000
6900
7800
IBW-A DUOVENT
®
6000 DC (80/60)
G1.1/4"
IBW-B DUOVENT
®
6000 DC (45/35)
IBW-A DUOVENT
®
6900 DC (80/60)
G1.1/4"
G1.1/4"
IBW-B DUOVENT
®
6900 DC (45/35)
IBW-A DUOVENT
®
7800 DC (80/60)
G1.1/4"
G1.1/4"
IBW-B DUOVENT
®
7800 DC (45/35)
G1.1/4"
Size unit
heater/cooler type
thread
500
800
1200
1800
3000
4200
5100
IBW-A DUOVENT
®
500 DC (80/60)
G1/2"
IBW-B DUOVENT
®
500 DC (45/35)
IBW-A DUOVENT
®
800 DC (80/60)
G1/2"
G1/2"
IBW-B DUOVENT
®
800 DC (45/35)
IBW-A DUOVENT
®
1200 DC (80/60)
G1/2"
G1/2"
IBW-B DUOVENT
®
1200 DC (45/35)
IBW-A DUOVENT
®
1800 DC (80/60)
G1/2"
G3/4"
IBW-B DUOVENT
®
1800 DC (45/35)
IBW-A DUOVENT
®
3000 DC (80/60)
G3/4"
G1"
IBW-B DUOVENT
®
3000 DC (45/35)
IBW-A DUOVENT
®
4200 DC (80/60)
G1"
G1.1/4"
IBW-B DUOVENT
®
4200 DC (45/35)
IBW-A DUOVENT
®
5100 DC (80/60)
G1.1/4"
G1.1/4"
IBW-B DUOVENT
®
5100 DC (45/35)
G1.1/4"
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!
Ventilation unit with heat recovery
DUOVENT
®
COMPACT DV
