Zanotti Zer0 120, Руководство по ремонту

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48
Motor not running
Improperly wired Check wiring against diagram
Low line voltage Check line voltage, determine
location of voltage drop
Relay contacts not closing Check by operating manually.
Replace relay
Fuses Blown Replace
Open circuit in motor winding Check terminal leads
High-pressure cut-out open Eliminate cause of excessive
pressure 1.1.6 & Section 4
Motor faulty Replace compressor
Unit Short cycle
Shortage of refrigerant Repair leak and recharge
Restricted expansion valve Clean expansion valve
Refrigerant overcharge (high-
pressure cut-out)
Remove excess of charge
Cycling on high-pressure cut-
out
Check air flow and fan
Dirty condenser coil Clean coil
Unit operates long or
continuously
Shortage of refrigerant Repair leak and recharge 4.4
Thermostat faulty Repair or replace
Dirty condenser Clean condenser 4.17
Air in the system Evacuate and recharge system 4.3
4.5 4.6
Compressor inefficient Replace compressor
Plugged expansion valve Clean expansion valve
Iced or plugged coil Defrost or clean coil
Defective vehicle body
insulation
Correct or replace
Too many door openings Keep door closed, install plastic
curtains
Load too warm Pre-cool hot product
Excessive superheat at
expansion valve
Adjust superheat 4.15.1
Box Temperature too high
Refrigerant Shortage Repair leak and recharge
Thermostat set point too high Change set point
Expansion valve plugged Clean or replace
Restricted lines Clean restriction. Tubing pinched
or shut
Hot load Precool hot product
Expansion valve superheat
too high or too low
Adjust superheat