The heat of the primary hot water from the main heat exchanger

Water pump failure phenomenon and judgment: After ignition, the water temperature rises too fast or overheating protection, first judge whether the automatic exhaust valve is open, open the front flat screw to see whether the pump shaft is rotating, and use a flat screwdriver to help rotate when it is not rotating. It is impossible to check whether there is 220V electricity on the water pump, if there is, the water pump is broken. The automatic exhaust valve is leaking, disassemble and reassemble, and apply detergent or neutral edible oil on the O-ring to easily install it back.
Wall-hung boiler water pump

Plate heat exchanger + three-way valve (introduction to the waterway of the plate changer)

Function: The heat of the primary hot water from the main heat exchanger is transferred to the bathroom water to increase the temperature of the bathroom water.
Principle of wall-hung boiler plate replacement

A. One side is cold water, the other side is hot water;

B. The corrugated surface increases the heat exchange area, which is easy to form turbulent flow at low speed, and improves the heat exchange efficiency.
Wall-hung boiler plate change system

Three-way valve

Function: Switch the direction of water flow. The three-way valve is a functional component that uses a single-tube type main heat exchanger to achieve dual functions of heating and bathroom. The complete three-way valve includes the valve body and the motor. The valve body is the executive part of the waterway switching, and the motor provides the power for the valve body to realize the waterway switching.
Three-way valve
Principle of three-way valve

In addition, the heat exchange system has other components: pressure relief valve, water flow sensor, water make-up valve, bypass, expansion tank, water pressure switch, temperature sensor, etc. Please refer to the relevant chapters for related content.

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