HAMWORTHY HEATING LTD
11
WESSEX 100 M
500001080/F
supply are given in
BS EN 60335, Part 1 or BS
3456, Part 201
.
The mains power supply MUST NOT be switched
by a time clock.
The Wessex 100M boiler has a
remote stop/start loop which can be used to operate
the boiler(s) under a timed regime. The boiler control
provides a 230V ~ signal that can be fed through a
volt free contact for operation. Refer to Figures 8.12
(p12) and 9.1 (p13) for typical site wiring connections.
See
BS 6644
for further information.
DO NOT feed mains voltage onto the remote
start stop or remote high/low control terminals.
9.1
Site Wiring
Access to the controls is achieved by rotating the ¼
turn latches and removing the door. A 20mm dia.
knockout is provided in each side panel if required
for electrical connections. Any other routing of site
cables should ensure that cables do not pass close
to the boiler flue hood or that any cable trunking
does not interfere with normal air circulation and
supply ducts.
A removable bracket is supplied with every Wessex
100M boiler having three 20mm dia. holes for
electrical cable anchorage. A plug and socket
arrangement is utilised for the site terminal
connections, the plug terminals being attached to
the removable bracket.
NOTE!
Rigid conduit
MUST NOT
be connected to
the bracket as this will prevent removal. Care must
be taken to ensure correct connections are made to
the relevant terminals before applying power.
Refer to Figures 8.12 (p12) and 9.1 (p13) for typical
wiring diagram.
9.2 Indication Signals and Volt Free Contacts
An optional kit is available to enable external
indicator lights or alarms to derive signals for normal
run, overheat and lockout.
Refer to the individual kit instructions for electrical
connections.
Each of these 230V signals are wired to relay bases
on the PCB board. Once fitted, the relay change
over contacts can be utilised to connect to a remote
alarm or indicator via the connections provided.
Note:- These external circuits
MUST
be isolated
before any service or maintenance procedures are
carried out.
Consideration should also be given to sizing of the
safety valve(s) in the system. See
BS 6759
: Part 1
for information.
See also
BS 6880
: Part 1 for design considerations.
8.12 Modular Boiler Control Schemes
For modular installations of the Wessex 100M range
of boilers, Hamworthy Heating can supply an
optional Milton boiler sequence control system.
This system comprises a wall mounted ‘Boiler
Sequence Control’ unit, and a ‘Sequencing Interface
Module’ unit mounted to the fascia of each boiler’s
control panel, which provides on/off or high/low
switching of the boiler. The Boiler Sequence Control
communicates with the ‘Sequencing Interface
Modules’ via a 2 wire data BUS. PT1000 type water
flow temperature, optional room temperature and
optional outside air temperature sensors are
available, which are wired to the Boiler Sequence
Control. Refer to Figure 8.12 (p12) and the Milton
boiler sequence control and sequencing interface
module instructions for further details.
Alternatively, the Wessex 100M boilers can be
controlled on/off or high/low via the remote on/off
and high/low control loops, by a non-HHL control
system - see Figure 8.12 (p12).
9.0 ELECTRICAL SUPPLY
WARNING:
THIS APPLIANCE MUST BE
EARTHED.
Wiring external to the boiler must be installed in
accordance with the IEE Regulations and any local
regulations, which apply. Wiring must be completed
in heat resistant 3-core cable. (Size 1.0mm² csa).
Boilers are normally supplied suitable for 230 volts,
50Hz. Fascia fuse rating is TA (T rated). External
fuses should be 6A for all boilers.
The method of connection to the mains electricity
supply must facilitate complete electrical isolation of
the single boiler/battery with a contact separation of
at least 3mm in all poles.
This appliance must be isolated from the mains
electricity supply in the event of electric arc welding
being carried out on any connecting pipework.
A mains isolator must be provided adjacent to the
boiler in a readily accessible position. The supply
should only serve the boiler.
NOTE!
Volt free contact electrical supplies must
also be isolated when fitted (see note on fascia).
Further details regarding connection to the electricity
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