TCL TCA-18HRA/DVO, Техническое руководство, Страница: 81 / 113

DC Inverter Air
running;
(1) Common Protection of AC System
General Protection: it is the protection function designed to protect the air conditioner (AC) from being
damaged by the possible big current, high temperature and high voltage (delay protection three minutes after
the start of compressor, phase sequence, phase‐loss protection, low/high voltage protection, over‐voltage and
under‐voltage protection of inverter compressor, exhaust air temperature protection, module protection, etc.);
Cooling and dehumidifying mode protection: evaporator anti‐freeze protection and condenser high temperature
protection.
Heating mode protection: evaporator high‐temperature protection, cold wind resistance function, blowing
residual heat function.
(2) Confirmation of Protection Types
Confirm the protection type through the display of indoor unit remote receiver panel indicator light and outdoor
unit digital tube.
Firstly, it is necessary to determine whether it is the electrical control problem (element, electrical control panel)
or the cooling system problem.
For example, there may be the following reasons for system display of high‐voltage protection: high‐voltage
switch damaged (element problem), system high voltage is actually not high, but there are problems for circuit
board after the test of circuit (circuit board of outdoor unit is failed), and there are cooling system problems
(poor heat radiation effect, excessive refrigerant, etc.).
(3) Water leakage and Noise Problem of
Indoor Unit Reasons for Water Leakage of Indoor
Unit:
(1) Condensation of indoor unit;
Possible reasons: system refrigerant is insufficient, system is blocked, and shunt capillary pipe of indoor unit is
blocked.
(4) Drain pipe is not connected or not subject to a heat insulation treatment;
(5) Drainage pump in the ceiling does not work;
(6) Low‐temperature protection of evaporator failed.
Reasons for Big Noise of Indoor Unit:
(1) Fan or motor of indoor unit is poorly assembled;
(2) Fan volute of indoor unit is deformed;
(3) The design and installation of air outlet pipe or return air duct is unreasonable during the on‐site installation
of air duct unit.
3. Control System
3.1. Overview of Control System
The control system of indoor/outdoor units uses the master‐slave structure as follows:
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