Electrical Installation - Dimplex SUTP Mid Range Installation Manual

4.10 Secondary Return
Where required the hot water outlet to the taps may be returned to the cold water inlet of the cylinder
using a circulating pump. The secondary return should be connected as per Figure 3. Note the 5litre
vessel included with the water heater is suitable for pipe lengths of up to 180m. For longer pipe runs
the cylinder should be increased in size accordingly.

7. Electrical installation

WARNING: THIS EQUIPMENT MUST BE EARTHED.
All electrical wiring must be carried out by a competent person and in accordance with the current
I.E.E. Wiring Regulations. All pipework should be earthed!
7.1.The immersion heater - A 3kW 230v 50Hz immersion heater is pre fitted to the cylinder at the
factory. It should be wired in accordance with the instructions given in Fig 4. The cable should be
routed through the strain relief bush.
7.2. Wiring instructions
a) The power supply to the heater must be via a double pole isolator switch or controller, having
contact separation of at least 3 mm, using 1.5mm sq. flexible cable, 85°C rubber insulated HOFR
sheathed, to comply with BS 6141 table 8 and must be fully earthed. Wire the water heater in
accordance with the wiring diagram below:
i. Connect the Earth wire to the terminal on the cylinder marked with the earth symbol.
ii. Connect the Live wire to the high temperature cut-out terminal A1
iii. Connect the Neutral wire to the high temperature cut-out terminal B1
WARNING:
DO NOT SWITCH ON THE ELECTRICITY SUPPLY UNTIL INSTRUCTED TO DO SO IN
THE COMMISSIONING PROCEDURE AND THE UNIT IS FULL OF WATER.
Figure 3
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