Appendix Belectrical Connections And Controls - Hamworthy Purewell Variheat mk2 70c Installation, Commissioning And Servicing Instructions

APPENDIX B - ELECTRICAL CONNECTIONS AND CONTROLS
ELECTRICAL DATA
Model
Normal Supply Voltage
Power Consumption (maximum)*
Start and Run Current (per boiler)
Figure B1.1 - Electrical Supply
*Where The max allowable power output from the IEC Outlet is 460 W (fitted with A T6.3H fuse).
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.
1.1 Wiring external to the boiler must be installed in accordance with the IET 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 Navistem B3000 control is
supplied with a replaceable fuse (T6.3H). External fuses should be 10A for all boiler modules.
1.2 3-Phase Electrical Supplies. Banks of Variheat mk2 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 with a separation of at least 3mm
in all poles.
1.3 A mains isolator must be provided adjacent to each boiler in a readily accessible position. The supply should
only serve the boiler.
1.4 Volt free contact electrical supplies must be isolatable where fitted.
1.5 Further details regarding connection to the electricity supply are given in BS EN 60335, Part 1.
WARNING: THE MAINS POWER SUPPLY MUST NOT BE SWITCHED
CAUTION: DO NOT FEED MAINS VOLTAGE ONTO THE TIMER TERMINALS
1.6 The mains power supply must be maintained at all times. Each Purewell Variheat mk2 boiler incorporates a
remote stop/start loop, which can be used to operate the boiler(s) under a timed regime. The boiler controls
provide a 5V 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.
FOR ELECTRICAL CONNECTIONS TO BOILER SEE FIGURE 4.6
FOR MULTIPLE BOILER WIRING SEE FIGURE B1.2 & B1.3
HAMWORTHY HEATING LTD
BY A TIME-CLOCK CONTROL
FOR BOILER WIRING SCHEMATIC SEE FIGURE 9.0
FOR CONTROL WIRING SEE FIGURE E1.3.1 TO E1.3.4
PUREWELL Variheat mk2
70c
- W
- A
NOTE:
41
95c 110c
140c
230V ~ 50Hz
554
0.54
180c
667
0.6
218612 A03