26
RWC
I
mmersion
Heater
Immersion Heater Wiring
Drain
Valve
Double
Chec
k
Valve
MAX0014D
A
B
Temperature
Ad
j
ustment
Dial
Thermal
Cut
-
out
Reset
Button
Thermostat
E
arth
Post
LI
V
E
(
Brown
)
Conductor
E
ARTH
(
Green/
Y
ellow
)
Conductor
NEU
TRA
L (
Blue
)
Conductor
1
.
5mm2
HOFR
3
Core
Cable
(
Must
be
routed
and
secured
via
Cable
Gland
provided
)
Promax
S
tore
Fig.
1
4
2.7 Immersion Heater
The immersion heater is rated 3
k
W at 240V and must be wired
to a separate, suitably rated electrical supply. THERE MUST
BE NO INTER
C
ONNE
C
TION WITH THE WIRING TO THE
BOI
L
ER.
WARNING: THE I
MM
ERSION HEATER
M
UST BE
EARTHED.
It should be installed in accordance with the current IEE Wiring
Regulations and be wired through a double pole isolating
switch or suitable controller with a contact separation of at
least 3mm in both poles. The immersion heater must be fully
immersed and not switched on dry.
2.7.1 Wiring the immersion heater
The immersion heater must be wired with
85
°
C
rubber
insulated HOFR sheathed flexible cable with a conductor cross
sectional area of
1
.
5
mm
2
complying with BS6
1
4
1
Table
8
.
Remove the immersion heater cover by removing the securing
nut and pulling the cap away from the cylinder. The
L
ive
(Brown) conductor should be connected directly to the
thermostat terminal mar
k
ed A. The Neutral (Blue) conductor
should be connected directly to the thermostat terminal
mar
k
ed B. The earth conductor should be connected to the
threaded post on the brac
k
et mar
k
ed .
The supply cable outer sheath must be routed through the
cable gland supplied and secured by tightening the gland after
fitting. Ensure the connections to the immersion heater are not
under any strain before tightening.
Re-fit the protective cover over the immersion heater assembly
and secure by the nut previously removed tightened onto the
end of the threaded post where it emerges through the cover.
2.7.2 Operation
The immersion heater is controlled by the rod type thermostat
supplied. DO NOT USE AN
Y
OTHER T
YP
E OF
THERMOSTAT.
A temperature setting of 60 to 6
5
°
C
is recommended and is
factory preset (between position 4 and
5
on the adjustment
dial). This should be reduced to
55
°
C
(position 3 on dial) in
hard water areas.
The thermostat incorporates a thermal cut-out which cuts the
power to the immersion heater in an overheat situation. Should
this operate it can be manually reset by pressing the red
button to the side of the temperature adjustment dial.
Note:
Investigate the cause of over-heating and rectify before
resetting.
© Baxi Heating UK Ltd 2015