Carrier AC310 Operation manual

Transport Air Conditioning
T--304 Rev A Change 07/09
OPERATION AND SERVICE
for
MODELS AC310 & AC350
Rooftop Air Conditioning Units
With
BT324 Carrier Sutrak Digital Display (CSDD)
or
280P/282P Electronic Thermostat

OPERATION AND
SERVICE MANUAL
TRANSPORT
AIR CONDITIONING UNIT
MODELS
AC310 & AC350
ROOFTOP AIR CONDITIONING UNITS
*CSDD -- BT324 (*Carrier Sutrak Digital Display)
Electronic Thermostat -- 280P & 282P

iT--30404/08
TABLE OF CONTENTS
PARAGRAPH NUMBER Page
SAFETY SUMMARY Safety--1....................................................................
DESCRIPTION 1--1...............................................................................
1.1 INTRODUCTION 1--1.....................................................................
1.2 GENERAL DESCRIPTION 1--2.............................................................
1.2.1 Rooftop Unit 1--2......................................................................
1.2.2 Condensing Section 1--2...............................................................
1.2.3 Evaporator Section 1--4................................................................
1.2.4 Drivers Evaporator (Optional) 1--6.......................................................
1.2.5 Compressor Assembly 1--6.............................................................
1.2.6 System Operating Controls And Components 1--7.........................................
1.2.7 280P & 282P (PWM) Electronic Thermostat Controller 1--7.................................
1.2.8 CSDD BT--324 (Carrier--Sutrak Digital Display) Microprocessor 1--7..........................
1.2.9 Motor Fault Board (Optional) 1--7........................................................
1.3 REFRIGERATION SYSTEM COMPONENT SPECIFICATIONS 1--7.............................
1.4 ELECTRICAL SPECIFICATIONS -- MOTORS 1--7............................................
1.5 SAFETY DEVICES 1--8...................................................................
1.6 AIR CONDITIONING REFRIGERATION CYCLE 1--8..........................................
1.7 HEATING CYCLE 1--8....................................................................
OPERATION (Manual Controller) 2--1..............................................................
2.1 STARTING, STOPPING AND OPERATING INSTRUCTIONS 2--1..............................
2.1.1 Starting 2--1..........................................................................
2.1.2 Stopping 2--1.........................................................................
2.2 PRE--TRIP INSPECTION 2--1..............................................................
2.3 MODES OF OPERATION 2--2.............................................................
2.3.1 Temperature Control 2--2...............................................................
2.3.2 Cooling Mode 2--2.....................................................................
2.3.3 Heating Mode 2--2.....................................................................
2.3.4 Boost Pump (Optional) 2--2.............................................................
2.3.5 Vent Mode 2--2.......................................................................
2.3.6 Compressor Unloader Control (Only with 05G or 05K Compressors) 2--2.....................
2.3.7 Override Mode -- AC310 (Dehumidification) 2--2..........................................
2.3.8 Evaporator Fan Speed Selection 2--3....................................................
2.3.9 Compressor Clutch Control 2--3.........................................................
(A--6, TM--16, TM--21) 2--3....................................................................
2.4 SEQUENCE OF OPERATION (280P / 282P) 2--3.............................................
2.4.1 Electronic Thermostat 2--3.............................................................
OPERATION BT324 Controller 3--1.................................................................
3.1 STARTING, STOPPING AND OPERATING INSTRUCTIONS 3--1..............................
3.1.1 Starting 3--1..........................................................................
3.1.2 Stopping 3--1.........................................................................
3.2 PRE--TRIP INSPECTION 3--1.............................................................
3.3 SEQUENCE OF OPERATION BT324 CSDD 3--2.............................................
3.3.1 Function of Keys when “Engine On” and controller active: 3--2...............................
3.3.2 Illuminating Indications (Display) 3--2....................................................

ii
T--304 04/08
TABLE OF CONTENTS Continued:
3.4 Operating Instructions BT324 3--2...........................................................
3.4.1 Display 3--2..........................................................................
3.4.2 Interior Temperature Control 3--2........................................................
3.4.3 Ventilation 3--2........................................................................
3.4.4 Reheat (optional) 3--3..................................................................
3.4.5 Temperature Indication 3--3.............................................................
3.5 CHANGING BETWEEN 5F (FAHRENHEIT) AND 5C (CELCIUS ) 3--3..........................
TROUBLESHOOTING 4--1.........................................................................
4.1 System Will Not Cool 4--1..............................................................
4.2 System Runs But Has Insufficient Cooling 4--1............................................
4.3 Abnormal Pressures 4--1...............................................................
4.4 Abnormal Noise Or Vibrations 4--1.......................................................
4.5 No Evaporator Air Flow Or Restricted Air Flow 4--2........................................
4.6 Expansion Valve Malfunction 4--2........................................................
4.7 Heating Malfunction 4--2...............................................................
SERVICE 5--1....................................................................................
5.1 MAINTENANCE SCHEDULE 5--1...........................................................
5.2 REMOVING EVAPORATOR COVER 5--1....................................................
5.3 REMOVING CONDENSER COVER 5--1.....................................................
5.4 INSTALLING MANIFOLD GAUGE SET 5--1..................................................
5.4.1 Installing R--134a Manifold Gauge/Hose SET 5--1.........................................
5.5 PUMPING THE SYSTEM DOWN OR REMOVING THE REFRIGERANT CHARGE 5--2...........
5.5.1 System Pump Down For Low Side Repair 5--2............................................
5.5.2 Removing Entire System Charge 5--3....................................................
5.6 REFRIGERANT LEAK CHECK 5--3.........................................................
5.7 EVACUATION AND DEHYDRATION 5--3....................................................
5.7.1 General 5--3..........................................................................
5.7.2 Preparation 5--3.......................................................................
5.7.3 Procedure for Evacuation and Dehydrating System 5--3....................................
5.8 ADDING REFRIGERANT TO SYSTEM 5--3..................................................
5.8.1 Checking Refrigerant Charge 5--3.......................................................
5.8.2 Adding Full Charge 5--4................................................................
5.9 CHECKING FOR NONCONDENSIBLES 5--4................................................
5.10 CHECKING AND REPLACING HIGH OR LOWPRESSURE CUTOUT SWITCH 5--4..............
5.10.1 Replacing High Or Low Pressure Switches 5--4...........................................
5.10.2 Checking High Or Low Pressure Switches 5--4............................................
5.11 FILTER-DRIER 5--5.......................................................................
5.11.1 To Check Filter--Drier 5--5..............................................................
5.11.2 To Replace Filter--Drier Assembly 5--5...................................................
5.12 SERVICING THE HEAT VALVE 5--5........................................................
5.12.1 Coil Replacement 5--6.................................................................
5.12.2 Internal Part Replacement 5--6..........................................................
5.12.3 Replace Entire Valve 5--6
..............................................................

iii T--30404/08
TABLE OF CONTENTS Continued:
5.13 SERVICING THE LIQUID LINE SOLENOID VALVE 5--6.......................................
5.13.1 Coil Replacement 5--6.................................................................
5.13.2 Internal Part Replacement 5--6..........................................................
5.13.3 Replace Entire Valve 5--6...............................................................
5.14 SERVICE VALVES 5--7....................................................................
5.15 REPLACING RETURN AIR FILTERS 5--7...................................................
5.16 THERMOSTATIC EXPANSION VALVE 5--8..................................................
5.16.1 Valve Replacement 5--8................................................................
5.16.2 Superheat Measurement 5--9...........................................................
ELECTRICAL 6--1................................................................................
6.1 INTRODUCTION 6--1.....................................................................
LIST OF FIGURES
Figure 1--1 AC310/350 Rooftop Units 1--2...........................................................
Figure 1--2 Condensing Section Components (AC310 -- Dual Loop -- GEN I) 1--3..........................
Figure 1--3 Condensing Section Components (AC350 Single Loop -- GEN II) 1--4.........................
Figure 1--4 Evaporator Section Components (AC310 --Dual Loop -- GEN I) 1--5...........................
Figure 1--5 Evaporator Section Components (AC350 Single Loop -- GEN II) 1--6..........................
Figure 1--6 Refrigerant Flow Diagram -- Cooling (Dual Loop) 1--9...........................................
Figure 1--7 Flow Diagram -- Heating 1--10...............................................................
Figure 1--8 Refrigerant Flow Diagram, Cooling (Single Loop) AC350 1--11.................................
Figure 1--9 Sheet 1 -- Electrical Control Board (280P) 1--12.............................................
Figure 1--9 Sheet 2 Legend 1--13....................................................................
Figure 1--10 AC350 With BT324 Control 1--14.........................................................
Figure 1--11 Motor Fault Board (Optional) 1--15........................................................
Figure 2.1 Control Switches (Typical) 2--1..............................................................
Figure 2.2 280P / 282P Thermostat 2--3.............................................................
Figure 3--1 Bus Dash With A/C Switch & BT324 CSDD Controller 3--1...................................
Figure 3--2 BT324 CSDD Controller 3--2.............................................................
Figure 5--1 Manifold Gauge Set (R--134a) 5--2........................................................
Figure 5--2 In--Line Service Connections 5--3.........................................................
Figure 5--3 Checking High Pressure Switch 5--4......................................................
Figure 5--4 Filter--Drier Removal 5--5................................................................
Figure 5--5 Heat Valve 5--6........................................................................
Figure 5--6 Liquid Line Solenoid Valve 5--7...........................................................
Figure 5--7 Service Valve R134a (High Side) 5--7.....................................................
Figure 5--8 Return Air Grill Assembly With Air Filter Showing 5--7.......................................
Figure 5--9 Diffuser and Filter Element 5--8..........................................................
Figure 5--10 Filter, Diffuser and Composit Frame 5--8.................................................
Figure 5--11 Return Air Grill Assembly With Diffuser And Composit Frame Showing 5--8...................
Figure 5--12 Thermostatic Expansion Valve 5--8......................................................
Figure 5--13 Thermostatic Expansion Valve Bulb and Thermocouple 5--9.................................
Figure 6--1 System Controls (Typical) 6--2...........................................................
Figure 6--2 Manual Controls With Manual Reheat Control (Sheet 1) 6--3.................................
Figure 6--3 Manual Controls With Manual Reheat Control (Sheet 2) 6--4.................................