Baxi LUNA HT 1.350, Instructions Manual

Page: 87 / 104

87
instructions pertaining to the instaLLer 924.493.3
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at
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13. connecting the mains supply
Electrical safety of the appliance is only guaranteed by correct grounding, in compliance with the applicable laws and
regulations.
Connect the boiler to a 230V mon ground power supply by means of the three-pin cable supplied with it and
make sure you connect polarities correctly.
use a double-pole switch with a contact separation of at least 3mm in both poles.
In case you replace the power supply cable fit a HAR H05 VV-F’ 3x­0.75mm 2 cable with an 8mm diameter max­.
The fuse, a fast-acting type rated 2A, is incorporated into the power supply terminals (remove the black fuse holder to
enable inspection and/or replacement).
iMportant:
Check that the overall current drawn by accessories connected to the appliance is less than 2 A. If the value
is greater, a relay must be wired between the boiler control circuit board and the accessories drawing the higher current.
Turn the control box­ downwards and access the terminal blocks M1 and M3 by taking off the main protective cover.
The pumps of the heating system (P1 and P2) have to be connected to boiler terminal block following the wiring of figure
10, a relay must be wired between the boiler control circuit board and the pumps.
If the boiler unit’s electronic card is wired up to a single pump with these characteristics
230 V ac; 50 hz; 1 a max; cos
f
> 0.8.
then it is not necessary to add a relay.
Check the correct size and rating of the pump by referring to graph n° 1, which shows the boiler pressure losses.
13.1 connecting the pump-heating system
Figure 9
0601_2003/CT_0674
Terminal board
Terminal board
Cover
Terminal board
Cover