Repair - Sinclair S therm Series Service Manual

Malfunctions
Poor efficiency of hot
water heating

5.3 Repair

5.3.1 Key Components
Picture
Reasons
1.Poor heat insulation of water system.
2.Poor heat exchange of evaporator.
3.Poor refrigerant of unit.
4.ockage of heat exchanger at water side.
Name
Compressor
Electronic Expansion
Valve
Gas-liquid Separator
4-way Valve
Plate Heat
Exchanger
Water Pump
Expansion Vessel
1.Enhance heat insulation efficiency of the
system.
2.Check if air in or out of unit is normal and
clean evaporator of the unit.
3.Check if refrigerant of unit leaks.
4.Clean or replace heat exchanger.
It is the heart of the cooling system, mainly used to turn the
low-temperature, low-pressure refrigerant vapor to high-
temperature high-pressure vapor and then discharge it to the
evaporator. The two-stage enthalpy-adding compressor is
adopted herein, which can improve the heating performance
of the unit largely.
It is one of four main components and used to turn the hi-
pressure liquid refrigerant to low-temperature, low-pressure
vapor-liquid mixture and adjust the refrigerant flow rate
entering the evaporator.
It is installed at the side of the suction line, and used to
prevent liquid refrigerant entering the compressor, otherwise,
the wet compression or the liquid slugging may occur.
It is used to switch flow direction of refrigrant and then
realize switchover between cooling and heating. It also can
be used for defrosting through the counterflow.
It is the water-refrigerant plate type heat exchanger,
used to liquefy the high-temperature high-pressure vapor
refrigerant or evaporate the low-temperature low pressure
liquid refrigerant. Heat of condensation is taken away by
circulation water and heat for evaporation is supplied also by
circulation water.
It is the power equipment for water circulation.
It is used to keep stable pressure of the water system. The
tank is charged with a certain volume of nitrogen which
is separated from the water side with a gasbag. When
pressure of the water side exceeds the nitrogen pressure,
the gasbag will expand and water enters into the tank so as
to lower the pressure of the water system. In contract, when
pressure of the water system goes down, nitrogen in the
tank will expel water out to the water system.
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Troubleshooting
Function