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Thermo King
Refrigerator
V250
Thermo King V250 User Manual
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Opera
ting Instr
uctions (
Rev 1/99)
27
4.
One-half ho
ur after loading, defrost
the unit by mome
n-
tarily pressing the Man
ual Defrost switch. If the coil
temperature
has dropped be
l
ow 42 F
(5.6 C), the unit
will defrost. The defrost cycle should stop automati-
cally
.
Bi-monthly
Post T
rip Checks
1.
W
a
sh the u
nit.
2.
Check for leaks.
3.
Check
for loose or
missing hardware.
4.
Check for
physical damage to the unit.
34
36
Table of Contents
Default Chapter
4
Table of Contents
4
Safety Precautions
7
Safety
8
Specifications
9
Maintenance Inspection Schedule
13
Unit Description
15
Liquid Injection System
15
Oil Separator
16
Unit Operation
16
Unit Features
17
Protection Features
18
Optional Features
18
Serial Number Locations
18
Operating Instructions
31
Unit Controls
31
Unit Protection Devices
32
Unit Operation
33
Bi-Monthly Pre-Trip Checks
33
Starting the Unit
33
Adjusting the Thermostat
34
After Start Inspection
34
Loading Procedure
34
Post Loading Procedure
35
Bi-Monthly Post Trip Checks
35
Electrical Maintenance
37
Unit Wiring
37
Cab Control Box
37
Selecting the Temperature Scale
37
Selecting the Setpoint Range
37
Setpoint Differential Adjustment
38
Testing the Cab Control Box
39
Display Diagnosis Chart
39
Thermostat Switch Sequence Test
41
Defrost System
42
Engine Operation
42
Electric Standby Operation (Model 20)
43
Defrost Components
43
V250 Defrost System and P.C. Board Identification and Testing
44
P.C. Board Identification
45
Troubleshooting the V250 Defrost System with P.C. Board P/N 41-776
49
Troubleshooting the V250 Defrost System with P.C. Boards P/N 41-1619 and P/N 41-1812
52
Electrical Maintenance (Continued)
52
P.C. Board P/N 41-776 Test Procedure
55
Board P/N 41-1812 and P/N 41-1619
56
M10 (V250/V-090) Cab Control Box Test Procedure
57
Condenser Fan Pressure Switch (CFPS)
59
AC Components (Model 20)
59
Contactors
59
Overload Relay
59
Electric Standby Circuits (Model 20 Only)
59
12 Volt System
60
Evaporator Heaters (Optional)
60
Refrigeration Maintenance
61
Refrigerant Charge
61
Charging the Refrigeration System
61
Checking the Refrigerant Charge
63
Checking Compressor Oil Charge
64
High Pressure Cutout Switch (HPCO)
64
Low Pressure Cutout Switch (LPCO)
65
Cleanup Procedure for Small Truck Units
66
Refrigeration Service Operations
69
Compressor
69
Condenser Coil
70
Drier
70
Receiver Tank
71
High Pressure Cutout and Condenser Fan Pressure Switches
71
Hot Gas Solenoid Valve
71
Liquid Injection Solenoid Valve
71
Oil Separator
72
Liquid Injection Metering Orifice
72
Testing the Liquid Injection Solenoid Valve and Metering Orifice
73
Check Valve Repair (Model 20 Only)
73
Evaporator Coil
76
Expansion Valve Assembly
77
Low Pressure Cutout Switch
78
Suction Pressure Regulator Valve
78
Replacing Refrigerant Hoses
78
V-250 R-404A Conversion Instructions
81
Structural Maintenance
83
Unit Inspection
83
Evaporator Coil
83
Condenser Coil
83
Condenser Fan Location
83
Unit Mounting Bolts
83
Compressor and Clutch Maintenance
85
Clutch Removal
85
Clutch Installation
87
Shaft Seal Cover and Shaft Seal: Removal and Installation
89
Special Tools
92
System Compressor and Oil
94
Checking the Oil Level
95
Electrical Connection
95
Clutch Test
96
Belt Tensions
96
Engine/Compressor Belt and Pulleys
96
Electric Motor/Compressor Belt
97
Over-The-Road Mechanical Diagnosis
99
Road Compressors
100
Electric Standby Mechanical Diagnosis
101
Condition
101
Possible Cause
101
Remedy
101
Electric Standby Service Checks
104
V250 Installation Checklist
111
Wiring Diagrams and Schematic Index
113
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Thermo King V250 Specifications
General
Brand
Thermo King
Model
V250
Category
Refrigerator
Language
English
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