HAMWORTHY HEATING LTD
38
Wessex ModuMax
mk3
Boilers
500001308/C
APPENDIX B
-
ELECTRICAL CONNECTIONS AND CONTROLS
ELECTRICAL DATA
Model
97/97
116/116
147/147
196/196
254/254
Normal Supply Voltage
230V ~ 50Hz
Power Consumption (maximum per module)
-
W
166
240
Maximum Current (per module)
-
A
0.72
1.05
B1.1 Electrical Supply
IMPORTANT: Individual boiler modules 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 cable of 1.0mm² cross sectional area. Boilers are
normally supplied for connection to a 230 volts, 50Hz mains supply. The Navistem is supplied with a replaceable
fuse (T6.3A). External fuses should be 10A for all boiler modules.
2. 3
-
Phase Electrical Supplies. Individual modules of ModuMax 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 using the conduits supplied. High and low voltage cables should be separated and routed along
individual conduits.
4. 2 & 3 high stacked modules. It is highly recommended that each boiler module is connected via its own mains
isolator to facilitate servicing and maintenance of the individual boiler modules whilst leaving the remaining
modules in operation. For typical schematic please refer to figure B1.2 on the next page.
5. Volt free contact electrical supplies must be isolatable where fitted.
6. 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
7. The mains power supply must be maintained at all times. Each Wessex ModuMax 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.
NOTE:
FOR ELECTRICAL CONNECTIONS TO BOILER SEE FIGURE 4.6
FOR BOILER WIRING SCHEMATIC SEE FIGURE 9.3.2
FOR MULTIPLE BOILER WIRING SEE FIGURE B1.2
FOR CONTROL WIRING SEE FIGURE E1.3.1 TO E1.3.3
