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Circuit Diagram 
 
1. Schematic Circuit Diagram 
 
 
 
A. Plug 
B. Switch 
C. Lamp 
D. ICE Maker (Preparative) 
E. Valve (Preparative) 
F. Thermostat 
G. Defrost Timer 
H. Thermostat 
I. Defrost Heater 
J. Fuse 
K. Fan 
L. Fan 
M. Overload Protector 
N. Compressor 
O. PTC 
 
 
Brief Description of Control Principle
 
 
HTE21/HTQ21 are forced air-cooling refrigerators with two doors. A mechanical type 
of all the control is generally adopted. The thermostat directly controls the start and 
stop of compressor, and hence the refrigerator temperature.  
 
Low Temperature Compensation in the above schematic diagram. When the ambient 
is below the set temperature, the switch will be closed and the heating will work, 
thus ensuring the normal start, and operation of refrigerator at lower ambient 
temperature, in such case, the freezer compartment temperature can reach a good 
point.