Carrier T-326 User's Manual
Contents
1. booklet and refer to it whenever you have a question aboutthe operation of your Carrier Transport Air Conditioning system More comprehensive information can be found in the Split System Operation and Service Manual T 299 This manual can be obtained from your Carrier Transport A C dealer Your air conditioning system has been engineered to provide long trouble free performance when it is properly operated and maintained A comprehensive maintenance program will help to insure that the unit continues to operate reliably Such a maintenance program will also help to control operating costs increase the unit s working life and improve performance Some Vehicles may require information from manuals supplied by the vehicle manufacturer or other special equipment suppliers We urge you to review all these publications carefully This will help you enjoy safe and trouble free operation of your vehicle When having your unit serviced be sure to specify genuine Carrier Transicold replacement parts for the highest quality and best reliability Carrier Transport Air Conditioning Dealers know your vehicle air conditioning system best and will ensure your complete satisfaction To find the Dealer nearest you go to www transportaircon carrier com and click on Dealer Locator or refer to the Carrier Bus Stop Dealer Directory 62 10810 or contact the Carrier Transport Air Conditioning Technical Service Hot Line 1 800 450 2211 At Carrier Tr2. IRE UER Carrier Transicold Division Tel 1 800 673 2431 Carrier C ti Fax 1 717 764 0401 SUCI o o Transport Air Conditioning Group P O Box 4805 Syracuse N Y 13221 U S A www carrier transicold com TRANSICOLD member of the United Technologies Corporation family Stock symbol UTX 2005 Carrier Corporation e Printed in U S A 0605
3. O CURB SIDE 24 57 57 MOUNT KIT NO BELT NO ROAD SIDE 2 222__ INSTALLER ZELUS c _ DATE 77 4 2 _ Figure 1 6 4 6 System Reqi Requirement Label T 326 8 UNiT OPERATION 2 1 OPERATING INSTRUCTIONS Before attempting to operate the system power must be available from the vehicle battery If the engine is not running start the engine Most systems will not operate unless a signal is received to the controller from the vehicle ignition Carrier Transport Air Conditioning system s can be supplied with two different type manual controls the Standard Manual Control and the Florida Control 1 Control Panel Housing 4 Fan Speed Switch 2 Nameplate Switch 8 Speed or Variable Mounting 5 Ambient Air Sensor 3 Thermostat Control Thermostat Figure 2 1 Drivers Control Panel Standard 2 2 DRIVER S CONTROL PANEL STANDARD The standard Drivers Control Panel See Figure 2 1 consists of an evaporator fan speed switch three speed or variable and an adjustable thermostat The drivers control panel is normally located within easy reach of the driver On larger bus applications there could be two separate air conditioning system driver control panels One for each system 9 T 326 There will be some applications where the switch mounting plate thermostat and fan speed switch are mounted in the drivers area without the control panel housing On other applications the vehicle manufacturer OEM will supply diffe
4. OFF Switch b Fan Speed Switch c Potentiometer d In Line Fuse Behind Controller 2 3 1 ON OFF Switch Power is supplied to the controller through an in line fuse see Figure 2 3 from a 12 VDC ignition source originating from the vehicle The controller will not operate until the ignition switch is activated T 326 10 Move the ON OFF switch to the ON position A green light will illuminate indicating that the controller has power At the same time the evaporator fans will operate in either Low Medium or High speed depending on the Fan Speed switch location A C CONTROL H ON 1 Face Plate 2 Green Light 3 Rocker Switch 2 Position ON OFF 4 Rocker Switch 3 Position LOW MED HIGH 5 Thermostat Control Potentiometer Figure 2 2 Switch Assembly TEMPCON 2 3 2 Fan Speed Switch 3 Speed The evaporator fan speeds can be adjusted by pushing the rocker switch to the desired position a H High Speed b M Medium Speed L Low Speed When the evaporator fan speed switch is positioned at the desired speed a signal is sentto the corresponding fan speed relay located on the electrical circuit board 2 3 3 Thermostat Control The thermostat control potentiometer has an operating range of 60 to 85 degrees F Rotate the potentiometer switch knob to the right clockwise for maximum cooling Rotate the potentiometer switch knob to the left counterclockwise for less cooling 11 T 326 Figure 2 3 In Li
5. Transport Air Conditioning AIR TEMP C Carrier TRANSPORT AIR CONDITIONING OPERATOR S MANUAL for SPLIT SYSTEM Bus Air Conditioning Units T 326 Rev TRANSICOLD OPERATOR S MANUAL BUS AIR CONDITIONING UNITS GEN IV amp GEN V CONTENTS Introduction euin wn Rr r ee 1 Safety Ce be Ee ae ade 3 Unit System Information 4 1 1 WHAT IS AIR CONDITIONING 4 1 2 SPLIT SYSTEM et rie team 4 13 SYSTEM DESIGNATIONS 4 14 SYSTEM COMPONENTS 4 1 5 MODEL AND SERIAL NUMBER TAGS 6 16 SYSTEM REQUIREMENTS LABEL 8 Unit Operation 9 2 4 OPERATING INSTRUCTIONS 9 2 2 DRIVER S CONTROL PANEL STANDARD 9 2 3 DRIVER S CONTROL PANEL FLORIDA 10 2 4 PRE TRIP INSPECTION 12 System Maintenance 13 3 1 Maintenance Schedule 13 3 2 Warrantv Service 14 INTRODUCTION SPLIT SYSTEM OPERATOR S MANUAL This guide has been prepared for the operator of Carrier Transport Air Conditioning systems It contains basic instructions for the daily operation of the air conditioning system as well as safety information and other information that will help you to maintain a comfort level for your self and your passengers Please take the time to read the information contained in this
6. an Evaporator s a Condenser s a Compressor s and interconnecting refrigerant hoses fittings and electrical harnesses and controls A listing of the system components along with specific data for each is provided in Paragraph 1 4 1 3 SYSTEM DESIGNATIONS Tie In System Is a Carrier evaporator and condenser connected to an existing OEM compressor and dash evaporator The OEM radiator type condenser is normally removed Max System A Carrier system installed along with an existing OEM system The systems operate independent of each other Stand Alone Standard System All Carrier components installed on a vehicle These can be either single or dual compressor systems 1 4 SYSTEM COMPONENTS Refer To Figure 1 1 Return Air Thermostat Sensor The system may be supplied with a thermostat or thermistor Both of these devices are temperature sensitive components which when activated signals the Electro Magnetic Clutch to engage disengage The return air thermostat is normally located in the drivers control panel while the return air thermistor is normally located in the return air flow of the evaporator assembly Electro Magnetic Clutch The Electro Magnetic clutch controls the operation of the compressor When engaged the compressor circulates refrigerant and provides cooling Compressor The compressor is a belt driven high pressure pump which circulates the refrigerant through the evaporator and condenser The operat
7. ansport Air Conditioning we are continually working to improve the products that we build for our customers As a result specifications may change without notice 1 SAFETY Your Carrier Transport Air Conditioning system has been designed with the safety of the operator in mind During normal operation all moving parts are fully enclosed to help prevent injury During all pre trip inspections daily inspections problem troubleshooting you may be exposed to moving parts please stay clear of all moving parts when the unit is in operation 4A WARNING Beware of unannounced starting of the unit The unit may cycle the fans and operating compressor unex pectediv as control requirements dictate Turn svstem off and disconnect batterv power REFRIGERANT The refrigerant contained in the air conditioning svstem can cause frostbite severe burns or blindness when in direct contact with the skin or eves For this reason and because of legislation regarding the handling of refrigerants during svstem service we recommend that whenever your unit requires service of the refrigeration System you contact your nearest Carrier Transport Air Conditioning authorized dealer for service 3 T 326 Unit SYSTEM INFORMATION 1 1 WHAT IS AIR CONDITIONING Air Conditioning is the cooling heating dehumidification and filtration of the air within the passenger compartment of a vehicle 1 2 SPLIT SYSTEM A Split System normally includes
8. eds of the permanent magnet evaporator blower motors 5 T 326 Pressure Switch The systems use high and low pressure switches wired in series to control the power circuit of the compressor clutch relay If either pressure switch opens interrupting the circuit to the clutch relay the operation of the compressor will stop When conditions return to normal the switch will automatically reset and the compressor will resume operating The switches are non adjustable Freeze Up Thermostat Freeze up thermostats are used to prevent ice formation on the evaporator coil which is an indication that liquid refrigerat is getting back to the compressor Carrier Transport Air Conditioning systems use a freeze thermostat freezestat wired in series with the system pressure switches and thermostat thermistor to control the operation of the compressor clutch Refrigerant A refrigerant is a material that is used to move heat from the passenger compartment to the outside air It is a substance that gives up heat by condensing at high temperature and pressures and absorbs heat by evaporating at low temperatures and pressures The heat transfer properties exhibited when refrigerant changes state is the foundation of the refrigerant cycle 1 5 MODEL AND SERIAL NUMBER TAGS In order to identify the air conditioning components you have you will need to know the model number and serial number All Carrier Transport Air Conditioning evaporators condense
9. ing system Remember if you have a question or concern and need help contact your nearest Transport Air Conditioning Dealer To find the Carrier Transport Dealer nearest you go to www transportaircon carrier com and click on Dealer Locator or refer to the Carrier Bus Stop Dealer Directory 62 10810 or contact the Carrier Transport Air Conditioning Technical Service Hot Line 1 800 450 2211 for the center nearest you T 326 14 INDEX C Clutch Electro Magnetic 4 Compressor 4 Condenser 4 Control Panel Florida 10 Control Panel Standard 9 E Evaporator 5 F Filter Dryer 5 Fuse In Line 12 Introduction 1 Maintenance Schedule 13 Max System 4 Model Tag 6 O Operating Instructions 9 P Pre Trip Inspection 12 R Refrigerant 3 6 Resistor 5 S Safetv 3 Sensor Return ir 4 Serial Tag 6 Split Svstem 4 Stand Alone Svstem 4 Switch Fan Speed 10 11 Switch ON OFF 10 Switch Pressure 6 Svstem Components 4 Svstem Designations 4 Svstem Maintenance 13 Svstem Label 8 T Thermostat Freeze Up 6 Thermostat Return Air 4 Thermostat Control 10 11 Tie In System 4 Index 1 INDEX CONTINUED U W Um Warranty Service 14 it Operation i itioni nit Operation What Is Air Conditioning 4 V Valve Expansion Block 5 Index 2 2 Carrier Transport Air Conditioning Z Carrier 50 Grumbacher Road A United Technologies Company SE PA
10. ion of the compressor is controlled by the Electro Magnetic clutch Condenser The condenser is normally located in the skirt or on the roof of the vehicle Its primary function is to reject heat which was transferred to the refrigerant by the evaporator from the passenger compartment of the vehicle T 326 4 8 FR Air Out 1 Compressor 6 Liquid Line 2 Electro Magnetic Clutch 7 Evaporator 3 Discharge Line 8 Block Valve TXV 4 Condenser 9 Freezestat Coil 5 Filter Dryer Sight Glass freeze up thermostat Assembly 10 Suction Line Figure 1 1 Component Locations Filter Dryer The filter dryer removes moisture and particulate matter from the refrigerant Expansion Block Valve Meters the refrigerant flow into the evaporator coil The majority of the Gen 4 Excel and all Gen 5 systems use a nonadjustable block valve with an 8 F superheat setting which is preset at the factory If you feel there is a problem with the block valve do not attempt to adjust the valve if needed it should be replaced by an authorized Carrier Transport A C Service center Evaporator The evaporator is located in the interior of the vehicle Its primary function is to transfer heat contained in the passenger compartment air into the refrigerant which is circulated by the compressor through the evaporator coil During this process the air is also filtered and dehumidified Resistor Resistors are used to control the spe
11. ne Fuse amp Holder 3 Amp 2 3 4 In line Fuse The controller is protected by a 3 Amp ATO type in line fuse Figure 2 3 To replace the fuse do the following a Make sure ignition power is off b Grasp fuse cover at finger grips and lift off cover Remove fuse and check if fuse is defective Replace if needed Push fuse cover back on to in line holder Restore ignition power and place ON OFF switch to ON 2 4 PRE TRIP INSPECTION After starting system operation allow system to stabilize for ten to fifteen minutes and check for the following 1 Listen for abnormal noises from the vehicle engine evaporator and condenser areas 2 Ensure evaporator and condenser fans are operating 3 Ensure water is not dripping from the evaporator or air ducts 4 Check for reduced airflow This is normally caused by dirty or clogged evaporator filters T 326 12 SvsTEM MAINTENANCE 3 1 MAINTENANCE SCHEDULE X Pre a inspection after starting Refer to para X a tension and condition of drive belts b Weekly Maintenance X Perform daily inspection X Check condenser evaporator coils and return air filters for cleanliness ei Maintenance Perform weekiv inspection Clean or replace Evaporator return air filters Inspect Condenser coil fins Clean when neces sary Inspect refrigerant hoses and fitting connections Inspect electrical harness and connection
12. renttype controls for the air conditioning system Refer to OEM technical manual for operating instructions 2 2 1 Fan Speed Switch three speed or variable Turning this switch clockwise will energize the evaporator and condenser fan motors The compressor clutch will also be energized if the thermostat calls for cooling see thermostat control operation Three Speed The standard fan speed switch has four settings Off 0 Low 1 Medium 2 and High 3 speed operation This switch controls the operation of the system and the evaporator blower s by energizing the appropriate circuits and relays located on the electrical control panel Variable Speed Certain applications may be fitted with a variable speed control switch instead of the standard three speed switch This switch controls the speed of the evaporator motors by varying the supply voltage 2 2 2 Thermostat Control The thermostat controls the temperature within the passenger compartment by switching system components on and off Rotate the potentiometer switch knob to the right clockwise for maximum cooling Rotate the potentiometer switch knob to the left counterclockwise for less cooling 2 3 DRIVER S CONTROL PANEL FLORIDA TEMPCON This control panel See Figure 2 2 is normally used in school buses located within the state of Florida but not limited to that area This controller is wired to an electrical control board The controller consists of a ON
13. rs and compressors have a model serial number tag located on the assembly See Figure 1 2 for skirt mounted condenser data tag location Figure 1 3 for the CM 7 11 rooftop condensers data tag location Figure 1 4 for GEN 4 Excel evaporator data tag location and Figure 1 5 for GEN 5 evaporator data tag location Knowing these locations and the information on the data tags will aid you in identifying the correct service procedures Figure 1 2 Skirt Mounted Condensers T 326 6 Figure 1 4 Rear Side Mounted Gen IV Evaporators NOTE The EM 9 evaporator data tag is located on the side of the evaporator assembly not between the blower assemblies Figure 1 5 Rear Side Mounted Gen V Evaporators 7 T 326 1 6 SYSTEM REQUIREMENTS LABEL The system requirements label See Figure 1 6 is conveniently located within the vehicle s engine compartment This label when properly completed by the installer will givethe servicing technician the refrigerant and oil charge s evaporator s condenser s and compressor s serial numbers the drive belt s number mount kit number the date of installation and the installer SERVICE 1 800 450 2211 CIR convitionine system SERVICE 1890 259 7502 SER NOS COMP 1 C272 33 2222 EVAP 1 2 3 COND 102 S0 2 2 P2 OSW ST REFRIGERANT TYPE R A24 e s1 QTY LBS OZ 42 QTY LBS 7 OZ OIL TYPE YG SAMDEH 1 ZZ OZ 2 QTYZ 02 BELT N
14. s Check battery voltage System operates efficiently at 13 5 volts d Inspection Inspect Evaporator s coil fins heater coil if installed Clean if needed Check blower operation Check current draw and voltage of system compo nents including fan motors Check that all compressor mounting brackets and hardware are tight Tighten and torque to proper specifications Check hose and harness under vehicle for proper support and protection Check Evaporator drain lines 13 T 326 SYSTEM OFF OPERATION Continued e Semi Annual Inspection and Maintenance Check system pressures Check refrigerant in sight glass Check element in the the sight glass Green is dry Yellow is wet Inspect condenser fan blades Open bus heater valves In winter Close bus heater valves In spring Remove or install optional condenser winter guard kit f Annual Inspection and Maintenance X Inspect electrical panel and terminals Clean if needed with a high grade cleaner specifically for mulated for this purpose Inspect Evaporator drain pan Clean if needed Check pressure switch operation Check evaporator roof mounting and sealing Check condenser mounting fan guards and screen grill 3 2 WARRANTY SERVICE Thank youfor choosing a Carrier Transport Air Conditioning system for your vehicle We want to assure you of our continuing interest in your pleasure and satisfaction with your air condition
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