HAMWORTHY HEATING LTD
58
MILBORNE
500001130/J
APPENDIX B - ELECTRICAL CONNECTIONS AND CONTROLS
ELECTRICAL DATA
Model
381
382
Normal Supply Voltage
230V ~ 50Hz
Power Consumption (maximum)
-
W
170
340
Start and Run Current (per module)
-
A
0.8 / 0.74
501
502
170
340
B1.1 Electrical Supply
IMPORTANT: Individual boilers must be earthed.
The boiler must be isolated from the mains electricity supply in the event of electric arc
welding being carried out on any connecting pipework.
1. 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 of 1.0mm² cross sectional area. Boilers are
normally supplied for connection to a 230 volts, 50Hz mains supply. The boiler control is supplied with a
replaceable fuse (T4A). External fuses should be 6A for all boilers.
2. 3-Phase Electrical Supplies. Individual modules of Milborne boilers and boilers installed in close proximity to
each other
MUST NOT
be supplied from different phases of a 3 phase supply. The method of connection to the
mains electricity supply must facilitate complete electrical isolation of the single boiler / battery with a separation of
at least 3mm in all poles.
3. A mains isolator must be provided adjacent to the boiler in a readily accessible position. The supply should only
serve the boiler.
4. Multiple modules. It is highly recommended that each boiler is connected via its own mains isolator to facilitate
servicing and maintenance of the individual boiler whilst leaving the remaining boilers in operation.
5. Further details regarding connection to the electricity supply are given in BS EN 60335, Part 1 or BS 3456, Part
201.
WARNING: THE MAINS POWER SUPPLY MUST NOT BE SWITCHED
BY A TIME-CLOCK CONTROL.
CAUTION: DO NOT FEED MAINS VOLTAGE ONTO THE TIMER TERMINALS
6. The mains power supply must be maintained at all times. Each Milborne boiler module incorporates a remote
stop/start loop, which can be used to operate the boiler(s) under a timed regime. The boiler controls provide a 24V
DC signal that can be fed through a volt free contact for operation. Refer to BS 6644 for further information on
installing the electrical supply.
7. Any pump controlled by the boiler must be installed using an adequate contactor.
NOTE: FOR BASIC TERMINATION DIAGRAM SEE FIGURE 4.6
