Electrical Connection
MultiMAXX HE
26
FläktGroup DC-2011-0142-GB 2018-05/R5 • Subject to modifications
5.8
OSHE control cabinet
Control cabinets incorporate all fuses, MCBs and contactors that are required for unit
regulation and protection. The speed selection switch is used to determine the required
fan speed (low or high). Heating stages 1, 2 or 3 are selected using a control switch for
heating. Activation and deactivation is performed using a room thermostat that must be
connected separately. In addition, the release can be performed using an external con-
trol signal.
Protection class: IP 44 (IP 20 after open)
Operating temperature: -5 °C to +40 °C
In order to prevent overheating of unit following deactivation, the fan is switched off with
a delay with consideration of preset fan overrun time.
Motor monitoring is performed via an integrated regulation of thermal contacts.
With the control response of the first safety thermostat deactivation and activation is
performed automatically, with the control response of the second safety thermostat the
heater bank is isolated and blocked. At the same time a fault is signalled via a lamp.
Unit can only be operated after relevant troubleshooting has been carried out.
Depending on the scope of supply, control cabinets can be equipped with different
additional functions.
Function „Z“
Regulation of secondary air louvre. Control switch open/0/close is used to move the
louvre into any required position.
Function „K“
Regulation of mixing air dampers. Control switch open/0/close is used to move the mix-
ing air damper into any required position.
Function "F"
Filter lamp. Filter contamination is signaled.
Depending on the scope, dimensions of control cabinets amount to 400 x 500 x 150
mm or 500 x 600 x 155 mm. Mounting drill holes for wall mounting are made on the
rear side of the control cabinet.
HAZARDOUS VOLTAGE!
Start-up and deactivation of the unit as well as opening of control cabinet may only
performed by qualified and authorised staff. After hardware installation and wiring an
acceptance report must be completed.
Control cabinets of the OSHE series must not be operated if such hardware has
been mechanically damaged!
NOTE!
Assembly and installation must only be carried out by qualified and authorised staff.
The OSHE control cabinet is mounted on a stable platform and secured using open-
ings on the rear panel and relevant fixing material which is not included in the scope
of supply. After installation the fixing screws must be sealed using enclosed caps.
Electrical connection of the OSHE control cabinet and the Multi
MAXX
HE unit must
be performed in conformity with the enclosed wiring diagram. Unused cable entry
points must be closed and sealed. Control cabinet must be supplied using an exter-
nal fuse and all-pole main switch.
Before commissioning all functions of the Multi
MAXX
HE electric unit heater and
OSHE control cabinet must be checked.
