62-11863
6-4
6.3.5
Defrost Cycle Malfunction
Will not initiate defrost auto-
matically
Defrost thermostat (DTT) open or defective
Loose terminal connections
Check the selected Defrost Interval
Replace
Tighten
Check
Will not initiate defrost manual-
ly
Microprocessor or Cab Command defective
Loose terminal connections
Defrost thermostat (DTT) open or defective
Replace
Tighten
Replace
Initiates but does not defrost
Hot gas valve malfunction
Defrost relay (DR) defective
Electric heater inoperative
Replace
Check
Frequent defrost
Defrost timer to be adjusted
Does not terminate within 45
minute maximum allowable
time
Defrost thermostats (DTT) shorted closed
Wet load
Replace
Check
6.3.6
Abnormal Pressure, Cooling
High discharge pressure
Condenser coil dirty or air flow restricted
Condenser fan defective
Loose or broken V-belt
Discharge check valve restricted
Non-condensibles or refrigerant overcharge
Hot gas valve (1HGV or 2HGV) malfunction
Check
Replace
Replace
Low discharge pressure
Compressor valve(s) worn or broken
Low refrigerant charge
Hot gas valve (1HGV or 2HGV) malfunction
High suction pressure
Compressor valve(s) worn or broken
Compressor Pressure Regulator (CPR) valve not adjusted
properly
Compressor gasket(s) defective
Hot gas valve (1HGV or 2HGV) malfunction
Low suction pressure
Suction service valve partially closed
King valve partially closed
Compressor Pressure Regulator (CPR) valve not adjusted
properly
Filter-drier partially plugged
Low refrigerant charge
Expansion valve malfunction
No evaporator air flow or restricted air flow
Excessive frost on coil
Open
Open
Check
Suction and discharge pres-
sures tend to equalize when
unit is operating
Compressor valves defective
Hot gas valve (1HGV or 2HGV) malfunction
Summary of Contents for SUPRA 950Mt
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Page 16: ...62 11863 1 6 1 10 SAFETY DECALS ...
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Page 109: ...Figure 8 2 Electrical Schematic Wiring Diagram Sheet 2 of 2 Based on Drawing 62ï ï04104ï ïART ...
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