Thermo King Super II SR+ User manual

SuperIISR+
with µP IV+
TK 50234-0-2-MM (6/98)
Copyright©1998 Thermo King Corp., Minneapolis, MN, U.S.A.
Printed in U.S.A.

The maintenance information in this manual covers unit models:
Super II SR+ with uP IV+
For further information, refer to…
di 2.2 and se 2.2 Engine Overhaul Manual TK 8009
X430 Compressor Overhaul Manual TK 6875
Diagnosing TK Refrigeration System TK 5984
Tool Catalog TK 5955
Parts Manual TK 40638
Principles of Evacuation for Field Application TK 40612
ElectroStatic Discharge (ESD) Training Guide TK 40282
THERMOGUARD uP IV Microprocessor Controller
Revision 04XX Software
SB-III SR+, Super-II SR+, and RMN SR+ Operations & Diagnosis Manual TK 40893
The information in this manual is provided to assist owners, operators and service people in the proper
upkeep and maintenance of Thermo King units.
This manual is published for informational purposes only and the information so provided should not be considered
as all-inclusive or covering all contingencies. If further information is required, Thermo King Corporation should be
consulted.
Sale of product shown in the Manual is subject to Thermo King’s terms and conditions including, but not limited to,
the Thermo King Limited Express Warranty. Such terms and conditions are available upon request.
Thermo King’s warranty will not apply to any equipment which has been “so repaired or altered outside the manu-
facturer’s plants as, in the manufacturer’s judgment, to effect its stability.”
No warranties, express or implied, including warranties of fitness for a particular purpose or merchantabil-
ity, or warranties arising from course of dealing or usage of trade, are made regarding the information, rec-
ommendations, and descriptions contained herein. Manufacturer is not responsible and will not be held
liable in contract or in tort (including negligence) for any special, indirect or consequential damages,
including injury or damage caused to vehicles, contents or persons, by reason of the installation of any
Thermo King product or its mechanical failure.

Recover Refrigerant
At Thermo King, we recognize the need to preserve
the environment and limit the potential harm to the
ozone layer that can result from allowing refrigerant
to escape into the atmosphere.
We strictly adhere to a policy that promotes the
recovery and limits the loss of refrigerant into the
atmosphere.
In addition, service personnel must be aware of
Federal regulations concerning the use of refriger-
ants and the certification of technicians. For addi-
tional information on regulations and technician
certification programs, contact your local THERMO
KING dealer.

Table of Contents
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Maintenance Inspection Schedule. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Unit Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Sequence Of Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Unit Model Super II SR+ w/THERMOGUARD IV+ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Design Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Protection Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Unit Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Switch Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Microprocessor Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Basic Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Unit Instruments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Unit Protection Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Unit Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Pre-Trip Inspection (Before Starting Unit). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Manually Starting Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Starting CYCLE-SENTRY Equipped Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
After Start Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Pre-Load Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Loading Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Post Load Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Post Trip Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Electronic Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
SR+ Control Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Control Panel switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
On-Off Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Preheat-Start Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Manual Defrost Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Unit Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
uP IV+ Microprocessor Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Microprocessor Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Select Key Prompts and Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
uP IV+ Microprocessor Standard Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Changing the Setpoint. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Selecting CYCLE-SENTRY or CONTINUOUS MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Viewing Select Key Display Screens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Starting the Diesel Engine. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Initiating a Manual Defrost Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Viewing and Clearing Alarm Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Software Revision 04xx Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Running a Full Pretrip Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Table of Contents (continued)
Electronic Controls (continued)
Displaying the Software Revision . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Operating Service Test Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Service Test Mode Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Service Test Mode Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Service Test Mode Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Service Test Mode Function Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Electrical Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Alternator (Australian Bosch) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Charging System Diagnostic Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Full Field Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Unit Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Charging System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Glow Plugs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Fuse Link . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
THERMOGUARD µP IV+ Microprocessor Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Defrost System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Defrost Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Air Switch Testing and Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Oil level switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Switch Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Bench Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Sensor Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Sensor Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Return Air Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Discharge Air Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Coil Temperature Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Engine Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Engine Lubrication System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Engine Oil Change . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Oil Filter Change . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Engine Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Antifreeze Maintenance Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Bleeding Air from the Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Engine Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Engine Fuel System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Bleeding the Fuel System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Water Separator/Fuel Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Water Separator/Fuel Filter Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Engine Speed Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
High Speed Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Injection Pump Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Injection Pump Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Table of Contents (continued)
Engine Maintenance (continued)
Adjusting Engine Valve Clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
Front Pulley Bolt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Crankcase Breather . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
Engine Air Cleaner (Filter). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Belts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Refrigeration Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
Refrigerant Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
Refrigerant Leaks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Checking Compressor Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
High Pressure Cutout Switch (HPCO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
Three-Way Valve Condenser Pressure Bypass Check Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76
Modulation Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77
Modulation Valve Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78
Hot Gas Solenoid Valve (HG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Hot Gas Solenoid Valve Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79
Thermax-V System (TF+ Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79
Thermax-V Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79
Refrigeration Service Operations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Condenser Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Discharge Vibrasorber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82
In-line Condenser Check Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82
Condenser Check Valve Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Bypass Check Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Receiver Tank. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Filter Drier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84
Expansion Valve Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84
Heat Exchanger. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Evaporator Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Accumulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Suction Vibrasorber. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Three-way Valve Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .87
Three-way Valve Condenser Pressure Bypass Check Valve Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89
Pilot Solenoid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
High Pressure Cutout Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
High Pressure Relief Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Throttling Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Modulation Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93
Hot Gas Solenoid Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .94
Liquid Line Check Valve Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .94
Liquid Line Check Valve Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .95
Thermax-v Expansion Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .96

Table of Contents (continued)
Structural Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Unit And Engine Mounting Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Unit Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Condenser, Evaporator, and Radiator Coils . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Defrost Drains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Defrost Damper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Fan Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Fan Shaft Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Fan Shaft Assembly Overhaul . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Condenser Fan Positioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Evaporator Blower Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Electrical Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Possible Cause . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Remedy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Fault Indication Diagnosis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Shutdown Alarms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Check Alarms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Stored Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Alarm Code Legend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Alarm Code Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Mechanical Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Possible Cause . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Remedy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Refrigeration Diagnosis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Symptom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Possible Causes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Refrigeration Cycle Without Modulation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Refrigeration Cycle With Modulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

i
Safety Precautions
GENERAL PRACTICES
1. ALWAYS WEAR GOGGLES OR SAFETY
GLASSES. Refrigerant liquid and battery acid can per-
manently damage the eyes (see First Aid under Refrig-
erant).
2. Never operate the unit with the compressor discharge
valve closed.
3. Keep your hands, clothing and tools clear of the fans
and belts when the unit is running. This should also be
considered when opening and closing the compressor
service valves.
4. Make sure gauge manifold hoses are in good condition.
Never let them come in contact with a belt, fan motor
pulley, or any hot surface.
5. Never apply heat to a sealed refrigeration system or
container.
6. Fluorocarbon refrigerants, in the presence of an open
flame or electrical short, produce toxic gases that are
severe respiratory irritants capable of causing death.
7. Make sure all mounting bolts are tight and are of cor-
rect length for their particular application.
8. Use extreme caution when drilling holes in the unit.
The holes may weaken structural components, and
holes drilled into electrical wiring can cause fire or
explosion.
9. Use caution when working around exposed coil fins.
Painful laceration can be inflicted from the fins.
10. Use caution when working with a refrigerant or refrig-
eration system in any enclosed or confined area with a
limited air supply (for example, a bus or garage).
Refrigerant tends to displace air and can cause oxygen
depletion resulting in suffocation and possible death.
REFRIGERANT
Although fluorocarbon refrigerants are classified as safe
refrigerants, certain precautions must be observed when
handling them or servicing a unit in which they are used.
When exposed to the atmosphere from the liquid state, fluo-
rocarbon refrigerants evaporator rapidly, freezing anything
they contact.
First Aid
In the event of frost bite, the objectives of First Aid are to
protect the frozen area from further injury, to warm the
affected area rapidly and to maintain respiration.
• EYES: For contact with liquid, immediately flush eyes
with large amounts of water and get prompt medical
attention.
• SKIN: Flush area with large amounts of lukewarm
water. Do not apply heat. Remove contaminated cloth-
ing and shoes. Wrap burns with dry, sterile, bulky
dressing to protect from infection/injury. Get medical
attention. Wash contaminated clothing before reuse.
• INHALATION: Move victim to fresh air and use CPR
if necessary. Stay with victim until arrival of emer-
gency medical personnel.
REFRIGERATION OIL
Avoid refrigeration oil contact with the eyes. Avoid pro-
longed or repeated contact of refrigeration oil with skin or
clothing. Wash thoroughly after handling refrigeration oil to
prevent irritation.
First Aid
In case of eye contact, immediately flush with plenty of
water for at least 15 minutes. Wash skin with soap and
water. CALL A PHYSICIAN.

ii

1
Specifications
ENGINE—SE 2.2
Model Thermo King se 2.2
Fuel Type No. 2 diesel fuel under normal conditions
No. 1 diesel fuel is acceptable cold weather fuel
Oil Capacity: Crankcase 15 quarts (14.2 liters) crankcase
16 quarts (15.2 liters) crankcase and filter
Fill to full mark on dipstick
Oil Type*: API Petroleum Type CD
API Synthetic Type CD After first 500 hrs.
Oil Viscosity** Above 80 F (27 C): SAE 40
50 to 90 F (10 to 32 C): SAE 30
20 to 70 F (-7 to 21 C): SAE 20-20W
-15 to 40 F (-26 to 4 C): SAE 10W
Below 0 F (-18 C) continuously: SAE 5W
Engine rpm:Low Speed Operation
High Speed Operation 1425 to 1475 rpm 2175 to 2225 rpm
Engine Oil Pressure 50 to 65 psi (276 to 448 kPa) low speed engine
operation
Intake Valve Clearance .016 in. (0.40 mm)
Exhaust Valve Clearance .016 in. (0.40 mm)
Valve Setting Temperature 70 F (21 C)
Fuel Injection Timing .02 in. (0.5 mm) at 14°BTDC (timed on No. 1
cylinder)
Engine Coolant Thermostat 180 F (82 C)
Coolant System Capacity 10 quarts (9.5 liters)
Radiator Cap Pressure 7 psi (48 kPa)
Drive Direct to compressor; belts to fans, alternator and
water pump
* Thermo King synthetic oil is compatible with petroleum lubricants so there is no danger if accidental
mixing occurs or if an emergency requires addition of petroleum oil. Mixing is not recommended, how-
ever, since it will dilute the superior performance properties of the synthetic oil.
**Multi-viscosity weight oil with the recommended API classification may be used based on the ambient
temperature and straight weight viscosity recommendations above. The above recommendations are
written for mineral oil based lubricants.
BELT TENSION Tension No. on TK Gauge P/N 204-427
12 V Alternator Belt 35
Fan Belt 50

Specifications (Rev 6/98)
2
REFRIGERATION SYSTEM
Compressor Model Thermo King X430
Refrigerant Charge—Type 13 lb (5.9 kg)—R-404A
Compressor Oil Charge 4.1 quarts (3.9 liters)*
Compressor Oil Filter Oil Charge 0.75 quarts (0.71 liters)
Compressor Oil Type Polyol Ester type P/N 203-413
Throttling Valve Setting 23 to 25 psi (159 to 172 kPa)
Heat/Defrost Method Hot gas
High Pressure Cutout 450 ± 10 psi (3103 ± 69 kPa)
Automatic reset @ 375 ± 38 psi (2586 ± 262 kPa)
* When the compressor is removed from the unit, oil level should be noted or the oil removed from the
compressor should be measured so that the same amount of oil can be added before placing the
replacement compressor in the unit.
AIR SWITCH SETTING 1.40 ± 0.08 in. (35.6 ± 2.0 mm) H2O
ELECTRICAL CONTROL SYSTEM
Voltage 12.5 Vdc
Battery One, group C31, 12 volt battery
Unit Fuse 40 amp
Control Circuit DC Fuse 15 amp
Microprocessor Power Fuse 1.5 amp
Modulation Valve Fuse 1.5 amp
Battery Charging 12 volt alternato
37 amp, brush type
Voltage Regulator Setting 13.8 to 14.2 volts @ 75.2 F (25 C)

Specifications (Rev 6/98)
3
ELECTRICAL COMPONENTS
NOTE: Disconnect components from unit circuit to check resistance.
Current Draw
(Amps)
at 12.5 Vdc
Resistance—Cold
(Ohms)
Fuel Solenoid 1.4 8.8
Damper Solenoid: Large
Small 5.7 2.9 2.2 4.3
High Speed (Throttle) Solenoid 2.9 4.3
Glow Plug (One) 7.1 1.8
Pilot Solenoid 0.7 17.0
Starter Motor—Gear Reduction Type 250-375*
Modulation Valve (Optional) 1.7** 7.6
Hot Gas Bypass Valve (Optional) 1.1 11.1
* On-the-engine cranking check. Bench test is approximately 100 amps on the direct drive starter and
approximately 80 amps on the gear reduction starter.
** Test at 12.5 Vdc
THERMOGUARD®MICROPROCESSOR TEMPERATURE CONTROLLER
Temperature Controller:Type Electronic THERMOGUARD Microprocessor with
digital thermostat, thermometer and fault indicator
monitor
Setpoint Range -20 to 80 F (-29 to 27 C)
Programmable setpoint range to 90 F (32 C)
DigitalTemp. Display -40 to 99.9 F (-40 to 40 C)
Internal Defrost Timer: Temp. Pulldown 4 hrs. std. (can be set to 2, 4. 6, 8, 10, or 12 hrs.)
Temp. In-range 6 hrs. std. (can be set to 4. 6, 8, 10, or 12 hrs.)
Defrost Initiation: Coil Sensor Coil must be below 45 F (7.2 C)
Defrost Termination:Coil Sensor Terminates defrost with coil temperature above
57 F (13.9 C)
Interval Timer Terminates defrost 30 or 45 minutes (programmable)
after initiation if coil sensor has not terminated
defrost

4

5
Maintenance Inspection Schedule
Pretrip
Every/
1,500
Hours
Annual/
4,500
Hours Inspect/Service These Items
MICROPROCESSOR
•Run Pre-trip (See Pre-trip in uP IV+ Microprocessor Operation).
ENGINE
•Check fuel supply.
•Check engine oil level.
•••
Inspect belts for condition and proper tension (belt tension tool
No. 204-427).
•••
Check engine oil pressure hot, on high speed. Minimum 276 kPa
(40 psi).
•••
Listen for unusual noises, vibrations, etc.
•Check air cleaner indicator.*
••
Change engine oil** (hot) and oil filters and fuel filters.
••
Clean crankcase breather.
••
Drain water from fuel tank and check vent.
•Inspect/clean fuel transfer pump inlet strainer.
•Check and adjust engine speeds (high and low speed).
•Check condition of engine mounts.
•Change engine coolant.
••
Replace fuel filter (replace water separator every 3000 hours).
Test fuel injection nozzles at least every 10000 hours.
ELECTRICAL
•••
Check ammeter for charge and discharge (glow plug) operation.
••
Inspect battery terminals and electrolyte level.
••
Inspect wire harness for damaged wires or connections.
•Check air switch setting.
•Inspect alternator.
* Change air cleaner when indicator reaches 22 in.
**NOTE: Petroleum oil rated “CD” must be used in the engine to allow 1500 hour extended
maintenance intervals.

Maintenance Inspection Schedule (Rev 6/98)
6
REFRIGERATION
•••
Check refrigerant level.
•••
Check for proper suction pressure.
•Check compressor oil level and condition.
••
Check throttling valve regulating pressure on defrost.
•Check compressor efficiency and pump down refrigeration system.
•Replace dehydrator and check discharge and suction pressure.
STRUCTURAL
•••
Visually inspect unit for fluid leaks.
•••
Visually inspect unit for damaged, loose or broken parts (includes air
ducts and bulkheads).
••
Inspect tapered roller bearing fanshaft and idlers for leakage and
bearing wear (noise).
••
Clean entire unit including condenser and evaporator coils and
defrost drains.
••
Check all unit and fuel tank mounting bolts, brackets, lines, hoses,
etc.
••
Check evaporator damper door adjustment and operation.
Pretrip
Every/
1,500
Hours
Annual/
4,500
Hours Inspect/Service These Items

7
Unit Description
The Super II SR+ uP IV+ is a one-piece, self-contained, die-
sel powered refrigeration-heating units. The unit mounts on
the front of the trailer with the evaporator portion extending
into the trailer. The unit uses hot gas to heat and defrost.
Power is provided by an se 2.2, a four-cylinder, water-
cooled, direct injection diesel engine rated at 27.8 continu-
ous horsepower (20.7 kilowatts) at 2200 rpm. An in-line
power pack provides direct drive power transfer from the
engine to the compressor. A belt drive system transfers
energy to the fans, the alternator, and the water pump.
The engine uses a spin-on, dual element, full flow/bypass
oil filter and “CD”rated petroleum engine oil for extended
1,500 hour maintenance intervals.
Additional unit features include the Thermo King X430
compressor and the THERMOGUARD uP IV+ Micropro-
cessor.
Thermo King X430 Compressor
The unit is equipped with a Thermo King X430, four-cylin-
der compressor with 492 cm3(30 cu. in.) displacement.
THERMOGUARD uP IV+ Microprocessor
The THERMOGUARD uP IV+ is a microprocessor control
system designed for use with transport temperature control
systems. The uP IV+ has the following features:
•Thermostat
•Digital Thermometer
•Hourmeters
•Oil Pressure Gauge
•Water Temperature Gauge
•Ammeter
•Voltmeter
•Tachometer
•Mode Indicator
•Refrigeration System Controller
•Diagnostic System
The microprocessor mounts inside a weather tight control
box. The LCD display and alarm light are clearly visible
through a transparent door. Opening the control box door
provides quick access to the microprocessor keypad. The
keypad is used to control the operation of the microproces-
sor. See the Operation and Diagnosis Manual (TK 40893)
for details.
The CYCLE-SENTRY system and an integral defrost timer
are standard features. The refrigeration modulation system,
data recording, Tracker (a satellite communication system
interface) and remote indicator lights are optional features.
CYCLE-SENTRY Start-Stop Controls
A CYCLE-SENTRY Start-Stop fuel saving system provides
optimum operating economy. Select Continuous or
CYCLE-SENTRY operation using the selector switch
located on the switch panel.
WARNING: When the unit On-Off switch is in the
ON position, the unit may start at anytime without
prior warning.
NOTE: A buzzer sounds when the unit is automatically
preheating.
The CYCLE-SENTRY system automatically starts the unit
on microprocessor demand, and shuts down the unit when
all demands are satisfied. As well as maintaining the box
temperature, engine block temperature and battery charge
levels are monitored and maintained. If the block tempera-
ture falls below 30 F (-1.1 C), the engine will start and run
until the block temperature is above 90 F (32 C). If the bat-
tery voltage falls to the programmed limit selected by
CYCLE-SENTRY Battery Voltage (typically 12.2 volts)
and CYCLE-SENTRY mode is selected, the engine will
start and run until the battery is recharged.

Unit Description (Rev 6/98)
8
Features of the CYCLE-SENTRY system are:
•Offers either CYCLE-SENTRY or Continuous Run
operation.
•Microprocessor controlled all season temperature con-
trol.
•Maintains minimum engine temperature in low ambient
conditions.
•Battery Sentry keeps batteries fully charged during unit
operation.
•Variable glow plug preheat time.
•Preheat indicator buzzer.
Refrigeration Modulation System (Optional)
The refrigeration modulation system provides precise con-
trol of the refrigeration system and the temperature of the
cargo area. As the temperature of the return air begins to
approach the setpoint, the microprocessor begins to close
the modulation valve in the suction line between the evapo-
rator and the heat exchanger. The microprocessor closes the
modulation valve more as the return air temperature gets
closer to the setpoint. When the temperature is near set-
point, the modulation valve is closed to its limit and the hot
gas bypass valve is opened. When the temperature begins to
move away from the setpoint, the modulation valve begins
to open. The hot gas bypass valve remains open until the
modulation valve is completely open, then the hot gas
bypass valve closes. This provides very smooth and steady
temperature control and the temperature does not oscillate
above and below setpoint as much as it does in a unit that
does not have modulation.
Data Recording (Optional)
The microprocessor records operational data and alarm
codes at preset intervals. This trip data can be retrieved (but
not erased) from the microprocessor memory using the
THERMOGUARD Data Pac™/ Mini Pac™portable
microcomputer. The microcomputer is connected to the
Data Pac interface on the front of the control box. A brief
graphical or tabular report can then be printed on the Data
Pac microprinter. More detailed reports may be printed in
either a graphical or tabular format on a high speed printer
external to the portable microcomputer. Trip data can also
be retrieved through the Tracker.
Tracker (Optional)
The Tracker is an optional system that can be included in
the microprocessor. The Tracker interfaces a satellite com-
munication system (SCS) located in the tractor. The Tracker
and the SCS are connected with a data cable. The Tracker
transmits data (recorded in the microprocessor) through the
SCS to a central location for processing. The Tracker trans-
mits data at preset intervals or on demand depending on the
type of SCS. Data can also be transmitted through a Tracker
to the microprocessor with some systems.
SEQUENCE OF OPERATION
When the unit is turned ON the LCD display, which nor-
mally shows the setpoint, the return air temperature, and the
operating mode, is illuminated. The microprocessor relays
and unit loads energize, and the unit can now be started
manually, or it may start automatically if the microprocessor
energizes the CYCLE-SENTRY system and the selector
switch in on CYCLE-SENTRY.
OPERATING MODES
The microprocessor uses a complex program to determine
which operating mode the unit should be in. Therefore, it is
difficult to predict which operating mode the unit should be
in by comparing the setpoint to the box temperature. Also,
the different versions of software that are used have some
operational differences.

Unit Description (Rev 6/98)
9
Modulation
Modulation is disabled if the setpoint is out of the modula-
tion range, if the unit is in defrost, or if the unit is in
CYCLE-SENTRY.
The lower limit of the modulation range is fixed at -5 C
(24 F). Setpoints below -5 C (24 F) disable modulation.
The upper limit of the modulation range is adjustable from
27 C (80 F) to -5 C (24 F). The default setting for the upper
limit is 27 C (80 F). Setpoints above this limit disable mod-
ulation.
If the upper limit of the modulation range is set at -5 C
(24 F), modulation is disabled.
No Modulation or Modulation Disabled
Units that are not equipped with modulation and units that
are equipped with modulation but have modulation disabled
use the following operating modes:
•High Speed Cool
•Low Speed Cool (or Null on Auto Start-Stop on tem-
perature rise only)
•Low Speed Heat (or Null on Auto Start-Stop)
•High Speed Heat
•Defrost
Modulation Enabled
Units that are equipped with modulation and have modula-
tion enabled use the following operating modes:
•High Speed Cool
•Low Speed Cool
•Low Speed Modulated Cool
•Low Speed Modulated Heat
•Low Speed Heat
•High Speed Heat
•Defrost
Defrost
Defrost mode can be initiated by the manual defrost switch,
air switch, or by the microprocessor defrost timer any time
the evaporator coil temperature is below 7.2 C (45 F). If the
unit is in the Null mode (Auto Start-Stop operation), manu-
ally initiating defrost will cause the unit to start and operate
in the defrost mode. When a defrost cycle is initiated, the
microprocessor energizes the damper solenoid, pilot sole-
noid and defrost light. The microprocessor maintains the in-
range signal during defrost.
The unit remains on defrost until the evaporator coil tem-
perature rises to 13.9 C (57 F) or the microprocessor defrost
timer terminates defrost after 30 or 45 minutes.
NOTE: The microprocessor will not respond to a tempera-
ture out-of-range condition for 45 minutes after the termi-
nation of a defrost cycle. This allows for normal
temperature recovery after the defrost cycle.

Unit Description (Rev 6/98)
10
UNIT MODEL
SUPER II SR+
W/THERMOGUARD IV+
DESIGN FEATURES
se 2.2 Diesel Engine •
X430 Compressor w/Synthetic Compressor Oil •
Thermo King Radiator •
Stainless Steel Grille •
Stainless Steel Evaporator Hardware •
Tapered Roller Bearing Fanshaft and Idlers •
Premium Drive Belts •
Heavy Duty Dry Element Air Cleaner Inside Unit Frame •
THERMOGUARD uP IV+ Microprocessor Controller •
Defrost Timer (Built into THERMOGUARD uP IV+) •
Fuel Filter with Water Separator •
Spin-On Full Flow/Bypass (Dual Element) Oil Filter •
Dealer Installed Synthetic Engine Oil Opt.
Compressor Oil Filter Opt.
CYCLE-SENTRY System •
37 Amp Alternator •
Refrigerant 404A •
Silicone Coolant Hoses Opt.
Fuel Heater Opt.
Frost Plug Heater Opt.
Condenser Shutters Opt.
Refrigeration Modulation System Opt.
Remote Indicator Lights Opt.