22
9
CAUTION:
To ensure the tightness of the boiler, use a self-
locking wire connector and tighten it on the wire.
9
WARNING:
It is the responsibility of the installer to provide
suitable grounding for the appliance; the manufacturer will not
be liable for any damage resulting from an incorrect or absent
ground connection.
It is forbidden to use gas and/or water pipes as a ground to electrical
appliances.
Use the power cable supplied to connect the boiler to the main
power supply. If the power cable is replaced, use factory authorized
parts as a replacement.
MAIN SUPPLY CONNECTION
The power supply cable must pass through the strain relief provided
in the casing (see figure below).
9
CAUTION:
The electrical receptacle can be mounted to the
left or right of the boiler.
It cannot be mounted to the boiler
casing or located under the boiler.
Strain relief for
power supply cable
120V inputs
Low Voltage Connections
(Auqastat or Tank Sensor)
7 .8
External wiring limitations
Any external wiring must remain within the limits as detailed in the
table below.
Connection
Maximum length
ft
meters
Outdoor temperature sensor
100
30
Room thermostat
100
30
OT connection
100
30
7 .9
Electrical connections
The front control is connected to the main PCB of the boiler from
which it also receives power; for electrical connections please refer
to the section “9 wiring diagram” page
39.
A qualified electrician has to connect the electrical supply to the
appliance. If controls – external to the appliance – are required,
a competent person must undertake the design of any external
electrical circuits.
Wiring to the appliance must be rated for operation in contact with
surfaces up to 194°F (90°C).
9
WARNING:
If an external electrical source is utilized, the
boiler, when installed, must be electrically bonded to ground
in accordance with the requirements of the authority having
jurisdiction or, in the absence of such requirements, with the
National Electrical Code, ANSI/NFPA 70 and/or the Canadian
Electrical Code Part 1, CSA C22.1, Electrical Code.
9
WARNING: ELECTRICAL SHOCK HAZARD
— For your
safety, turn off the electrical power supply at service entrance
panel before making any electrical connections to avoid
possible electric shock hazard. Failure to do so can cause
severe personal injury or death.
9
CAUTION:
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and dangerous
operation. Verify proper operation after servicing.
Low voltage connections
Carry out the low voltage connections as follows:
4 poles connector for BUS 485 (- A B +) signal (reserved for
future accessories)
8 poles connector for W -R - TBT - C - SE - OT+signal
- A B +
CE4
TBT
OT
SE
white
W
R
C
G
CE8
Connector
Label
Description
CE4
(- A B +)
Bus 485
CE8
TBT
Low Temperature Thermostat
OT - G
Open therm (OTBus)
SE - G
Outdoor Temperature Sensor
R
Room Thermostat (24V)
W
Room Thermostat - Heating
C
Room Thermostat - Common
M4a
T.BOLL.
DHW Aquastat
S.BOLL.
DHW 10kOhm NTC
carry out electric connections using the desired connector
CE8
9
CAUTION: It is recommended to use wires not exceeding
20 AWG (0.5 mm
2
). All wiring must be in accordance
with local codes and the National Electrical Code ANSI/
NFPA 70 - latest edition. In Canada, the installation must
conform to CSA C22.1 Canadian Electrical Code Part 1
and any local codes.
NOTICE:
In case of TBT connection, remove the respective
jumpers.
TBoll Aquastat or Sboll KBANT0101111 Sensor connection
To connect water tank thermostat and water tank probe access the boiler
