Thermostat

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2.11 ELECTRICAL DIAGRAMShould the Economy 7 system not to be used, a separate 13 amp supply to each element will be required. Through a double pole fused isolating switch having a contact gap of at least 3mm on each pole.The immersion heater shall be installed with 85°C rubber insulated HOFR-sheathed flexible cable complying with Table 8 of BS 6141: 1991. Make the connection(s) to the immersion heater(s) as per FIG. 2.12 and FIG. 2.13. For High Capacity 500 litre models consult the wiring diagram on the reverse of the inspection panel.

Single Element

THERMAL	THERMOSTAT
CUT-OUT
	ELEMENT
	3 kW
	240V~

FIG. 2.12

THERMAL	THERMOSTAT
CUT-OUT

THERMAL	THERMOSTAT
CUT-OUT

DAY ELEMENT

3 kW 240V~

NIGHT ELEMENT 3 kW 240V~

ECONOMY 7

FIG. 2.13

The thermostat(s) on the immersion heater(s) should be adjusted to trip at 60°C. This is the ideal temperature to prolong element life in hard water areas. Scale on the sheath builds up more rapidly at temperatures above this causing the element to overheat and premature failure can occur. Higher temperatures without additional controls would result in scalding.

In addition to the thermostat the thermal cut-out will switch power off to the element should the thermostat malfunction, causing an excessive rise in water temperature. The thermal cut-out can be reset manually after the fault

has been corrected.