andrews CWH120/200, Installation, Operation And Maintenance Manual

Page: 16 / 44

MAXXflo Water Heater
16 16
ELECTRICAL SUPPLY
External wiring to the water heater(s) must be
installed in accordance with current IET Wiring
Regulations (BS 7671) for the wiring of buildings
and to any Local Regulations that may apply.
The MAXXflo range is designed to operate from a
permanent 230v/50Hz single phases supply. The fuse
rating is 5 amps.
Maximum Electrical Loading
Model Type Watts Amps
30 kW 170 0.74
60 kW 340 1.48
90 kW 510 2.22
120 kW 680 2.96
The method of connection to the mains electricity
supply should facilitate complete electrical isolation
of the appliance, preferably by use of a fused double
pole switch or fused spur box serving only the heater.
The disconnection of the supply shall have a contact
separation of 3mm on all poles.
The point of connection to the mains electricity supply
should be readily accessible and adjacent to the appliance.
ELECTRICAL CONNECTION
A terminal block can be found above the control panel (Fig
4, below). This becomes accessible by first removing the
front cover.
The following connections can be made on the terminal
block (see Fig. 5 – Wiring diagram, on next page)
Terminals Terminal Function
AL1 – AL2 Alarm volt-free contacts (24 volt 1
amp max.)
EN1 – EN2 Enable or disable contacts volt-free
(link fitted to enable)*
BT1 – BT2 Secondary set point temp. enable (40
– 75°C)*
LS1 – LS2 Secondary return temp. sensor for
pasteurisation function
TH1 – TH2 Secondary pump control enable*
Pump L – Pump N Secondary pump power supply
(0.7 amp max)
*To activate, place a contact across the terminals
M5910 G
AL1
AL2
TH1
TH2
BT1
BT2
LS1
LS2
TS1
TS2
TS3
TS4
EN1
EN2
gy
gn
bk
or
y
r
y
bk
r
r/bl
bk
bk
bk
gy
br
br
br
br
gy
gy
gy
gy
br
bl
r
r
r
r
wh
wh
wh
wh
bl
br
bl
bl
bl
bl
br
br
br
br
br
br
br
br
bl
bl
bl
bl
SECONDAR
Y
PUM
P
Fig 6 – Terminal block connections
SECTION 3 • INSTALLATION