SECTION 10: WIRING AND ELECTRICAL INFORMATION
SECTION 10: WIRING AND ELECTRICAL INFORMATION
10.1 Electrical Supply
All heaters need a constant 230 V 50 Hz single phase supply connected to terminals L, N & Earth. Polarity "L & N" must be correct. The voltage between neutral and earth should be 0 and never exceed 15 volts.
All heaters and controls must be correctly earthed. All external wiring must comply with the relevant local codes. Wire specification
External controls must have the same constant 230 V 50 Hz supply.
An isolator with a contact separation of at least
3 mm on all poles must be installed adjacent to, but not attached to, the heater to disconnect all supplies to the heater and any remote control.
The final connection to the heater should be made by flexible cable or conduit to the main terminal block on the inside of the heater using 1 mm2 cable on all models.
Models | Fuse Size |
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CTUA (All Models) | 5 A |
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CTUB & CTUC (Models | 10 A |
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CTUB & CTUC (Models 75 - 115) | 20 A |
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CTUD heaters must have the external fan, or its control connected to Terminal 1 so that the fan run- on function at close down operates correctly.
10.2.1 Burner Controls (Thermostat)
Controls to operate the burner must be voltage free contacts connected between terminals 2 & 3 of the main terminal block.
10.2.2Positioning Room Thermostats or ROBERTS GORDON® Control
A room thermostat or ROBERTS GORDON® control should be mounted on a wall or column at a height of approximately 1.5 metres from the floor to measure the ambient temperature. It should be clear of both cold draughts and the direct path of warm air from the heater.
10.2.3 Remote Frost Thermostat
When required, connect to terminals 2 and 3 in the main terminal block.
Locate within the heated space adjacent to the most vulnerable equipment that requires protection.
See Page 16, Section 10.3 through Page 17, Section 10.4.
10.2.4 Remote Fan Controls
The fan will operate automatically providing there is a constant 230 V supply to the main terminals.
A switch or control wired between terminals L & 1 in the terminal block will allow external control of the fan(s).
The fan may be controlled to operate continuously from an external control, with the burner cycling on and off, providing that the fan
WARNING
Electrical Shock Hazard Disconnect electrical power before servicing.
Failure to follow these instructions can result in death or electrical shock.
10.2 Remote Controls
The heater is designed to be operated by controls installed remote from the heater. See Page 16, Section 10.3. through Page 17, Section 10.4.
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