What factors cause the plate heat exchanger to fail to fill with water?

Plate heat exchangers generally consist of outlet chamber, inlet chamber, main plates and radiator plates. Recently, many customers have consulted about plate heat exchangers and raised the same question: why does it sometimes seem impossible to fill the unit with water? Let’s find out.

Plate heat exchangers feature simple structure, cost efficiency and continuously upgraded performance.

Sometimes water can actually be filled, but the radiator shows full water after only a small amount of water is added. Soon after operation, the low-water alarm appears again. This phenomenon is known as "false water level".

Both of the above situations are mostly caused by the thermostat. Normally, the small holes on the thermostat valve discharge air during water filling. If these holes get clogged, air cannot be vented properly. Consequently, the system shows full water before the water jacket is completely filled, while the actual water volume is insufficient. To solve this problem, remove the thermostat of the plate cooler and clear the blocked holes. Replace the whole thermostat if it fails.