Bypass Operation
The bypass is a section of copper pipe work connected between the water body assembly
(effectively the cold water inlet) and the outlet of the heat exchanger and allows a quantity
of cold water to bypass the heat exchanger. The purpose of the bypass is to ensure the
heat exchanger operates at temperatures above the dew point of the combustion gases,
ensuring condensate is not produced, but low enough to maximise the heat exchangers
life. A valve fitted to the water body assembly controls the bypass. There are two types of
bypass valve utilised in the 18, 20 and 24 models. To determine what kind of bypass is
being utilized, compare the appliance to the wiring diagrams on pages 5 & 6.
Mechanical Bypass
The mechanical bypass is a small spring loaded valve located in the water body assembly.
The spring is temperature sensitive, as the cold water temperature decreases the spring
tension increases reducing the amount of cold water flowing through the bypass. The
bypass operates at all times when water is flowing.
Solenoid Operated Bypass
The solenoid operated bypass comprises a valve (located in the water body assembly)
that is controlled by a solenoid (mounted on the water body assembly). The PCB activates
the solenoid at the following predetermined temperatures:
Without Touch Pads: When the unit is preset at 40 or 43 degrees.
With Touch Pads: When temperatures from 37 to 46 degrees are selected.
At all other times the bypass does not operate.
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