Electrical Connection
MultiMAXX HE
22
FläktGroup DC-2011-0142-GB 2018-05/R5 • Subject to modifications
5.2.1 Connection to mains network
Electrical connection of fan switches and heater bank, operation of motor actuators of
a mixing air module and secondary air louvre, thermal protection of heater bank and
connection of room thermostats must be carried out in conformity with the valid con-
nection diagrams.The electrical installation of the MultiMAXX HE unit heaters must
only be carried out by qualified licensed electrical engineers in compliance with this
operation manual and the current regulations:Cable type and cable cross-section must
be selected by authorised staff.After installation of cables and connection of wires all
cable connections must be sealed in a waterproof manner.
5.2.2 Over-temperature thermostat of heater bank
The heater bank is fitted with 2 safety thermostats.
If supply air temperature exceeds 60°C, the 1st safety thermostat is activated; after
cooling down an automatic reconnection is performed; the 2nd safety thermostat deac-
tivates and blocks the unit if supply air temperature exceeds approx. 90°C. For manual
enabling - deactivate and isolate the unit first, perform troubleshooting and enable the
temperature limiter mechanically by pressing the release button. The release button is
fitted and can be accessed behind the terminal box cover of the heater bank.
5.2.3 Motor protection using thermal contact
Fan motors of the Multi
MAXX
HE unit heaters are standard fitted with thermal con-
tacts.By connecting the thermal contact to OSHE control cabinet the fan motor is
secured via motor internal temperature and unit deactivation in fault case.After the fan
motor cools down the fan is activated automatically. If the unit is operated by an exter-
nal regulation system the thermal contact must be incorporated in the safety circuit. In
this case FläktGroup can not assume any warranty obligations for such unit.
5.2.4 Connection with control units OSHE or regulation by others
HAZARDOUS VOLTAGE!
Before opening the unit connection box, the unit heater must be de-energised and
isolated at all poles.
• Connections must only be performed in accordance with the unit-specific wiring
diagram.
ATTENTION! CONTROL UNITS!
The connection diagrams are supplied with the corresponding control units.
Use the following control cables for connection:
– Control cable type depends on the unit configuration and local codes and
regulations
– Thermal contact connection using 0.5 mm
²
control cable with screen performed
as aluminium clad sleeve, e.g. J-Y(ST)Y 2x2x0.8.
NOTICE ON CONTROLS BY OTHERS!
For details on connecting individual assemblies (e.g. fan, heater bank) refer to the
unit-specific wiring diagram enclosed with the main unit.Before commencing con-
nections, check that the order code of the unit's electrical equipment matches the
wiring diagram.Give special attention to the left rotary field while connecting 2-speed
motors!
