MRF
16/22
MF 55-GB 1.21
11
disconnected from the electrical supply - see below.
3.3 Internal
unpacking
Lift the door latches and open the door. When the door was shut, a thin piece of foam was
placed between the door and furnace box. Remove all traces of this from the door area.
Remove the small foam blocks from either side of the door insulation plug.
Remove the slabs of foam from inside of the furnace chamber.
CAREFULLY !! Remove the strips of foam packing from around the elements. The elements
are very brittle. Pull the strips forward more than sideways.
3.4 Electrical
connections
Connection by a qualified electrician is recommended.
Check the furnace rating label before connection.
[See section 5.5 for location]
. The supply
voltage should agree with the voltage on the label, and the supply current capacity should
be sufficient for the amperage on the label.
The power supply to this product must be connected through an isolating switch operating
on all conductors, the switch must be in easy reach of the operator. It must be fused to give
a level of discrimination between the MRF 16/22 internal fuses and the external isolation
fuses. See Product rating label for voltage and specification.
[See section 13.5 for the
internal fuses fitted].
A line plug may be used after the isolating switch. The line plug must allow the protective
earth (ground) to be connected before the conductors and disconnected after them. The
supply point must be marked as the disconnecting device for the furnace.
The supply MUST incorporate an earth (ground).
The supply cable must enter the furnace case through an appropriate strain relief guard.
If an earth leakage device is fitted then it must be calibrated to 28mA to avoid nuisance
tripping.
MRF 16/22 connections
3 Phase supply specification
3 phase + neutral (star)
Delta
Voltage supply
380V – 415V
200V– 240V
Main Internal fuse
25A
40A
Terminal colour
L1
Black
Phase 1
Phase 1
L2
Black
Phase 2
Phase 2
L3
Black
Phase 3
Phase 3
N Blue
Neutral
N/A
PE Green/Yellow To
earth
/ Ground
To earth / Ground
3.5
Low voltage compensation
If the supply voltage proves to be routinely below the nominal figure for which the furnace
Figure 3.2 Electrical connections
