Installation
37
MAXXfl o EVO
4.10 ELECTRICAL & COMMUNICATION CONNECTIONS
This heater
must
be earthed
Isolate the mains electrical supply to the heater before starting any work and observe all relevant
safety precautions
External wiring to the heater must be installed in accordance with current Regulations for the wiring of buildings
and to any Local Regulations that may apply.
This heater is designed to operate from a 230V, single phase supply fused at 5 amps. Mains input cable should
be at least 0.75mm
2
, 3 core cable.
The method of connection to the mains electricity supply should facilitate complete electrical isolation of the
heater. A fused double pole switch or fused spur box serving only the heater should be used. The point of con-
nection and isolation to the mains electricity supply should be readily accessible and adjacent to the heater, and
should be connected to the mains supply as detailed above.
4.10.1 ACCESS TO THE TERMINAL CONNECTIONS
Open the heater front door panel by removing the two screws on the left hand side, to reveal the electrical con-
nections inside (see illustration below).
4.10.2 VOLT FREE CONNECTIONS
This heater has volt free connections, which can be used for a Building Management System or a remote indica-
tor panel. These volt free connections are pre-confi gured to perform the following functions:
Volt free - Remote enable -
Closing this connection will activate the DHW system if the switch on the front of the
heater is turned to the on position. A loop of wire is pre-installed and this will need to be removed, when installing
BMS activation wiring.
Volt Free - Fault Indicator
- Following a fault that has been detected by the control system, this relay will activate
and close the circuit to indicate that a fault has occurred. Please note that a 1 minute fault reporting delay has
been programmed into the controller, but this time delay can be altered via the GUI if required.
Volt Free - Flame Indicator
- When the heater is in operation, the relay will activate and close the circuit (a fl ame
has been detected by the controls).
Modbus
L N PE L N
R
em
ot
e
en
ab
le
(v
olt
f
re
e)
F
la
m
e
in
di
ca
to
r
230V
50Hz
5A
Q4
DHW
pump
F
au
lt i
nd
ic
at
or
BSB
A+
B-
RE
F
D
B/C
L+
M
B/C
L-
Liv
e
Neu
tr
al
Liv
e
Ear
th
Neu
tr
al
1 2 3 4
9
B39
DHW
sensor
kit
Blac
k
Rel
a
y
5 6 7 8
Wh
ite
Rel
a
y
CO
NO
NC
CO
NO
NC
Low / No voltage
High
voltage
