E93.1001EN.C Manual CD
+
34
ELECTRICAL INSTALLATION
7.1
General
All the wiring is connected to a separate connector that is fitted in a socket. The connector can be taken from the
sockets without loosening the wiring. The connections are placed on top of the display panel and can be accessed
by removing the water heater front door and the connector protection cover.
•
For operation the water heater needs a power supply of 230 Vac 50 Hz.
•
The water heater connections are not life/neutral sensitive (the water heater is not phase-sensitive).
•
The wiring for the connections can be entered at the bottom of the water heater through the cable glands.
•
NOTICE: Before starting to work on the water heater, it must be switched off and the power supply to the
water heater must be disconnected.
•
Electrical wiring should be installed according to all applicable standards and regulations.
•
Working on the water heater should only be done by a skilled service engineer/installer and according to
all applicable standards and regulations.
7.2
Electrical connections
7.3
Function of the electrical connections of the water heater
1-2
DO NOT USE
Do not connect any cable to these connections
3-4
TANK SENSOR
This external tank sensor measures the water temperature at the system side. The sensor must be mounted on
the return pipe at the system side, close to the tank. See also the drawings in § 9.1, pages 40 and 41.
PARAMETER: No parameter settings needed.
5-6
DO NOT USE
Do not connect any cable to these connections
7-8
GENERAL BLOCKING
A heat demand that will start the burner will be blocked when terminals 7 and 8 are not bridged. This connection
is for the use of external safety devices (terminals must be bridged for allowing burner to fire).
9-10
EMPTY
11-12
EXTERNAL WATER PRESSURE SWITCH
A water pressure switch is mounted in the water heater. As an option an external water pressure switch can be
wired to the terminals. In this case remove connectors from ‘internal water pressure switch’. When terminals 11-
12 are not bridged, the water heater will lock-out. PARAMETER: A parameter change is needed.
DO NOT
USE
TANK
SENSOR
DO NOT
USE
GENERAL
BLOCKING
EMPTY
EXTERNAL
WPS
ON/OFF
STAT OR
OPEN
THERM
0 -10
VDC
CASCADE
CONNEC-
TION
LOCK-
OUT
OPERATION
HEAT
DEMAND
CIRCULATION
PUMP P3
DO NOT
USE
MAINS
230 VAC
1
2
3
4
5
6
7
8
9
10
11 12
13 14 15 16
17 18
19 20
21 22 23 24
25 26 27
28 29 30
31
32 33 34
+
-
L
N
L
N
L1
N
L2
A
B