Connection Of Water Heater - S&P DUOVENT COMPACT RV Series Manual

Ventilation unit with heat recuperation
14
®
DUOVENT
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.
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!
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 unit operation side 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 type
IBW-A DUOVENT
800
IBW-B DUOVENT
IBW-A DUOVENT
1800
IBW-B DUOVENT
IBW-A DUOVENT
3000
IBW-B DUOVENT
IBW-A DUOVENT
4200
IBW-B DUOVENT
IBW-A DUOVENT
6000
IBW-B DUOVENT
IBW-A DUOVENT
7800
IBW-B DUOVENT
COMPACT RV
®
RV 800-ErP2018
®
RV 800-ErP2018
®
RV 1800-ErP2018
®
RV 1800-ErP2018
®
RV 3000-ErP2018
®
RV 3000-ErP2018
®
RV 4200-ErP2018
®
RV 4200-ErP2018
®
RV 6000-ErP2018
®
RV 6000-ErP2018
®
RV 7800-ErP2018
®
RV 7800-ErP2018
Table of minimum air flows through the electric heater
®
of Duovent Compact RV units:
Size unit
RV800
RV1800
RV3000
RV4200
RV6000
RV7800
thread
1/2"
1/2"
3/4"
3/4"
3/4"
1"
1 1/4"
1 1/4"
1 1/4"
1 1/4"
1 1/2"
1 1/2"
3
Minimum air flow (m /h)
400
900
1400
2200
3000
4300