24
On-site connections on the HBMU heat management unit
A
Fig. 14
A
Diaphragm grommets for cables
■
Open diaphragm grommets as required. Thread
through only one cable at a time without a plug.
Ensure diaphragm grommets are airtight. If required,
remove plug from cable. After threading the cable
through, re-fit the plug to the wire ferrules.
■
For cables without strain relief bushings, provide
strain relief in the wiring chamber in the form of cable
ties.
Outside temperature sensor
Fitting location for outside temperature sensor
■
North or north-westerly wall, 2 to 2.5 m above
ground level; in multi storey buildings, in the upper
half of the second floor
■
Not above windows, doors or vents
■
Not immediately below balconies or gutters
■
Never render over.
Outside temperature sensor connection
See chapter "Connection and wiring diagram".
2-core lead, length up to 35 m with a cross-section
of 1.5 mm
2
Power supply
fÖ
Danger
Incorrectly executed electrical installations can
result in injuries from electrical current and dam-
age to the appliance.
Connect the power supply and implement all
safety measures (e.g. RCD circuit) in accord-
ance with the following regulations:
■
IEC 60364-4-41
■
IEEE Wiring Regulation; BS 7671:2018
■
Connection conditions of the local grid opera-
tor
■
Install an isolator in the power cable to provide
omnipolar separation from the mains for all active
conductors, corresponding to overvoltage cate-
gory III (3 mm) for complete isolation. The isolator
must be fitted in the permanent electrical installation,
in line with installation requirements.
We also recommend installing a pulse current-sensi-
tive RCD (RCD class A
).
■
Connect the power cable to the electricity supply
using a fixed connection.
■
If the power supply to the appliance is connected
with a flexible power cable, ensure that the live con-
ductors are pulled taut before the earth conductor in
the event of strain relief failure. The length of the
earth conductor wire will depend on the design.
■
Max. fuse rating 16 A.
Installation sequence
Electrical connections
(cont.)
6174240
Installation
