4. ELECTRICAL CONNECTIONS
All Heaters MUST BE EARTHED.
On small units there are 4 x 20mm and 1 x 25mm knockouts on the top or bottom of the heater and an additional 4 x 20mm and 1 x 25mm knockouts
on the back of the heater, if you require a 32mm hole gently open out a 25mm hole using a taper drill or step drill. Be careful you do not touch the
internal electrics when opening up the holes.
On large units there are 3 x 20mm, 1 x 25mm and 1 x 32mm knockouts on the top or bottom of the heater and an additional 3 x 20mm, 1 x 25mm
and 1 x 32mm knockouts on the back of the heater.
4.1 400V 3Phase (No Neutral)
Please make sure you have read the Safety instructions and that you are a suitably qualified electrician before continuing.
Please Note:- Specified cable sizes are for typical installations, correction factors may need to be used when determining actual
cable sizes.
Do NOT use power tools to undo or do up terminal screws.
Cable Sizes
OUH2-03-3W 3kW - Mains Cable - Use
minimum 1.5mm² 4 Core Mains Cable (see note
above).
OUH2-05-3W 5kW - Mains Cable - Use 1.5mm²
4 Core Mains Cable (see note above).
OUH2-07-3W 7.5kW - Mains Cable - Use
1.5mm² 4 Core Mains Cable (see note above).
OUH2-10-3W 10kW - Mains Cable - Use
2.5mm² 4 Core Mains Cable (see note above).
OUH2-15-3W 15kW - Mains Cable - Use 4mm²
4 Core Mains Cable (see note above).
OUH2-20-3W 20kW - Mains Cable - Use 4mm²
4 Core Mains Cable (see note above).
OUH2-25-3W 25kW - Mains Cable - Use 6mm²
4 Core Mains Cable (see note above).
Connect Brown / Phase 1 Wire
– Terminal L1 of
Heater
Connect Black / Phase 2 Wire
– Terminal L2 of
Heater
Connect Grey / Phase 3 Wire
– Terminal L3 of
Heater
Connect Green / Yellow / Earth Wire
– Terminal
E
of Heater
PLEASE CHECK ALL CONNECTIONS BEFORE TURNING ON AS INCORRECT WIRING IS NOT COVERED BY THE GUARANTEE
