Ideal PWM Cable Presapr71B 178123

The Ideal PWM cable (Presapr71B) is a wiring harness that carries the pulse-width modulation control signal between the solar controller and the circulating pump in Ideal solar thermal packages. It is supplied as Ideal part 178123 and sits within the wiring part type. The cable forms part of the electrical control side of the solar circuit, allowing pump speed to be regulated rather than the pump simply being switched on and off.

• The solar pump runs at a fixed speed and does not modulate in response to the controller
• Intermittent or absent pump operation even when the controller is calling for heat transfer
• A PWM or pump communication fault is displayed on the solar controller
• Visible damage to the cable sheath, moulded plug or exposed terminals
• A loose, corroded or heat-affected connector at the pump or controller end

• Confirm the appliance model, and the serial number where available, against the compatibility list before ordering.
• Compare the connector type and cable routing with the cable being removed.
• Older units may carry the alternative number 1783175 on the component label.
• Work on solar thermal systems should be carried out by a competent engineer.