GE ZIS 420DM

– 1 –
Technical Data ........................................................................................................................ 3
Model Nomenclature .............................................................................................................. 4
Rating Plate ...................................................................................................................... 4
Mini-Manual ....................................................................................................................... 4
Serial Number ...................................................................................................................5
Component Locator Views..................................................................................................... 6
Cabinet .................................................................................................................................... 9
Machine Compartment ..................................................................................................... 9
Door Closure Mechanism................................................................................................ 10
Doors and Hinges ............................................................................................................ 10
Door Gaskets.....................................................................................................................11
Rollers and Leveling ........................................................................................................11
Ice and Water Dispenser ...................................................................................................... 12
Controls ............................................................................................................................ 12
Water Valve and Water Tank ......................................................................................... 13
Airflow ................................................................................................................................... 14
Damper ............................................................................................................................ 14
Evaporator Fan ................................................................................................................ 15
Condenser Fan ................................................................................................................ 19
Defrost System ...................................................................................................................... 20
Adaptive Defrost .............................................................................................................. 20
Normal Operating Characteristics.................................................................................. 21
Abnormal Operating Characteristics ............................................................................. 21
Liner Protection Mode .................................................................................................... 21
Defrost Heater..................................................................................................................22
Evaporator Thermistor .................................................................................................... 23
Defrost Overtemperature Thermodisk ........................................................................... 23
Control System ...................................................................................................................... 24
Touch Panel and Temperature Control Board .............................................................. 24
Main Control Board ......................................................................................................... 25
Main Control Board Locator Tables ............................................................................... 26
Thermistors ...................................................................................................................... 31
Climate Control Drawer........................................................................................................ 32
Strip Circuit ...................................................................................................................... 32
Component Locator View............................................................................................... 33
Operation ......................................................................................................................... 34
Temperature Table .......................................................................................................... 35
Climate Control Drawer Top Panel (Mullion) ................................................................ 36
Control Board and Display ............................................................................................ 36
Fan and Fan Housing...................................................................................................... 38
Dampers ........................................................................................................................... 39
Heater............................................................................................................................... 40
Thermistor........................................................................................................................ 40
Airflow.............................................................................................................................. 42
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