Potterton iHE 100/300, Installation And Servicing Instructions

Page: 20 / 40

iHE 18
ELECTRICAL CONNECTIONS
This appliance must be earthed
Isolate the mains electrical supply before
starting any work and observe all relevant
safety precautions
External wiring to the Heater must be installed in
accordance with current I.E.E. Regulations for the
wiring of buildings and to any Local Regulations
that may apply.
The appliance 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
The method of connection to the mains electricity
supply should facilitate complete electrical isola-
tion of the appliance. A fused double pole switch
or fused spur box serving only the heater may be
used.
The point of connection to the mains electricity
supply should be readily accessible and adjacent
to the appliance, and should be connected to the
mains supply as detailed above.
A
CCESS TO THE TERMINAL CONNECTIONS
Remove the Side Access Panel (See Fig 1.1) to
expose the electrical connections.
A permanent live supply must be connected to the
appliance. Automatic timed or remote operation
of the appliance can be achieved by connecting
to the volt free “
Remote Enable ” terminals after
removing the link wire. (Fig. 4.2)
R
EMOTE
I
NDICATORS
:
The appliance has a volt free (or can be used with
voltages up to 230v) output, which can be con-
nected to a Building Management System or a
remote indicator panel. This input is connected to
the “BMS COMMON INPUT” terminal.
F
AULT
Five minutes after any fault occurs within the ap-
pliance an internal relay will activate and connect
“BMS COMMON INPUT” to “BMS FAULT OUT-
PUT”.
B
URNER
O
N
When the appliance heat engine/s are in operation
an internal relay will activate and connect “BMS
COMMON INPUT” to “BMS BURNER ON OUT-
PUT”.
Fig 4.2
L
Br G+ Or
N
B CL- Bk
E
G/Y CL+ R
L
R Gy
N B Gy
E
G/Y Y
L1
Y
L2
R/Y
N
B R/Y
E
G/Y R/Y
L
R/B Gy/Bk
N B G
E G/Y P
1 Bk/Gy
2 B/Gy
3 1
4 2
5
3
M6492 M6498
SPARE
HC2 MIXED
HEATING
CIRCUIT
PUMP Q6
HC2 MIXED
HEATING
CIRCUIT
VALVE
BMS COMMON
INPUT
Gy (Close/Y6)
Link if
not
used
REMOTE
SYSTEM
ENABLE H6
HC2 MIXED
HEATING
CIRCUIT
SENSOR B12
BMS "FAULT"
OUTPUT
Low Voltage High Voltage
230V 50Hz
MAINS
SUPPLY IN
HC1
DIRECT
HEATING
CIRCUIT
PUMP Q2
HC1/2/3
WIRED
ROOM
UNIT R1
WIRED
OUTDOOR
SENSOR B9
HC1/2/3
SWITCHED
ROOM
THERMOSTAT
H5
Or (Open/Y5)
Link if
not
used
SPARE
BMS "BURNER
ON" OUTPUT
ELECTRICAL CONNECTIONS