NHTSA ID Number: 10166363
Manufacturer Communication Number: IK2200088
TSB/Document Date: 2019-10-21
Summary
Factory Installed Air Conditioning, EC4.0 System operating instructions and service manual; only models built with feature code 48ADC, 48ADD, 48ADE, 48ADG, 48CVA, 48CVC, 48CVH, 48CVJ, 48CVL, 48CVM, 48UTX, 48VHG, or 48VHH.
IK2200088 - Factory Installed Air Conditioning, EC4.0 System BE, CE, FE, RE Bus Mo...
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Countries:
CANADA, UNITED
STATES, MEXICO
Document
IK2200088
ID:
Availability:
ISIS, Bus ISIS, FleetISIS Revision:
Major
System:
BUS BODY
Created:
10/19/2009
Current
Language:
English
Last
Modified:
8/9/2013
Other
Languages:
Français, Español,
Author:
Bob Ford
Viewed:
2110
6
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Title: Factory Installed Air Conditioning, EC4.0 System BE, CE, FE, RE Bus
Models
Applies To: BE, CE, FE, RE Bus Models 48ADD, 48ADE, 48ADG, 48CVA,
48CVC, 48CVH, 48CVJ, 48CVL, 48CVM, 48UTX, 48VHG, 48VHH BE and CE only –
48ADC
DESCRIPTION
This article includes the operating instructions and the service manual for the Trans/Air EC4.0 air
conditioning system.
Units built with factory installed air conditioning will have an option code for the air conditioning
system installed in the components section in ISIS. (Sample shown below) Verify the operating
system ordered on the unit prior to utilizing the appropriate iKNow article for service information.
Sample Feature Codes
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IK2200088 - Factory Installed Air Conditioning, EC4.0 System BE, CE, FE, RE Bus Mo...
Page 2 of 4
OPERATING INSTRUCTIONS
Trans/Air EC 4.0 Climate Control System
The EC4.0 climate control system has two driver control modules: Mode/Fan control switch and
Thermostat. The Mode/Fan control switch turns system on/off and controls evaporator blower
speed. The Thermostat displays cabin air temperature, fault and service codes, and adjusts set
point temperature.
BASIC OPERATION
Turn system on
With the vehicle running, press the MODE button to turn EC4.0 system on. The A/C indicator will light up
indicating system is in A/C mode. Fan speed indicator 1 will light up indicating the fan speed is Low. Thermostat
will also turn on automatically. LED display shows cabin air temperature.
Select mode of operation (Heat / Defog Optional)
Press the MODE button to change the operation mode between A/C, Defog or Heat.
Change fan speed
Press the FAN button to change the fan speed between Low, Medium, and High.
Change set point temperature
The thermostat LCD display shows cabin air temperature during normal operation. Press UP or
DOWN arrow once for set point mode. The set point temperature and a flashing decimal point will be displayed on
the LED in set point mode. Press the UP or DOWN arrow again to adjust the set point to the desired value. After 5
seconds, EC4.0 will switch back to normal operating mode displaying cabin temperature. The new set point then
becomes effective.
The default set point temperature is 70ºF. This setting is stored in EC4.0’s non-volatile memory. It
takes effect every time the system turns on. To change the default set point temperature setting,
go into the setting mode and adjust the set point to the desired value, then press the UP and
DOWN arrow simultaneously. The new set point value will be stored into the non-volatile memory and become
the default set point.
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IK2200088 - Factory Installed Air Conditioning, EC4.0 System BE, CE, FE, RE Bus Mo...
Page 3 of 4
Turn system off
Press the MODE button until all the mode indicators turn off. The fan speed indicators and the thermostat LCD
display will turn off consequently.
Fan Only mode operation
Press the FAN button while the EC4.0 system is off. The A/C system will be running in Fan Only
mode. (Only evaporator blowers run, compressor and condenser remain off.) Press the FAN
button to set the fan to desired speed (Low, Medium or High). In Fan Only mode, the thermostat
LCD still shows the cabin air temperature. To turn Fan Only mode off, keep pressing the FAN
button until all the fan speed indicators turn off.
TROUBLE SHOOTING
Fault Code
HP
LP
Lu
Sr
System Indicator
Hi
Lo
Sr
Description
High pressure fault
Low pressure fault
Low clutch voltage/blown fuse
Maintenance required
Return air temperature above 90°F
Return air temperature below 60°F
1500 Hr Service Reminder
No service required when the thermostat LCD shows “Hi” or “Lo”.
Turn the system off and then turn it back on to reset the “Sr” code. Service is required if “Sr” code cannot be reset.
SERVICE MANUAL
EC4.0 Sercive Manual
CIRCUIT DIAGRAMS
EC4.0-1.pdf
EC4.0-2.pdf
EC4.0-3.pdf
TECHNICAL SUPPORT
Trans/Air Manufacturing
http://www.transairmfg.com
800-673-2446
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Copyright © 2013 Navistar, Inc.
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TSB/Document ID: IK2200088
Replacement Service Bulletin Number:
MFR Communication Date: 2013-08-09
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL
MFR Component System:
MFR Component Subsystem:
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