Page 3 - TABLE OF CONTENTS; PARAGRAPH NUMBER
i T-- 304 04/08 TABLE OF CONTENTS PARAGRAPH NUMBER Page SAFETY SUMMARY Safety-- 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DESCRIPTION 1-- 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
Page 4 - TABLE OF CONTENTS Continued:; TROUBLESHOOTING
ii T-- 304 04/08 TABLE OF CONTENTS Continued: 3.4 Operating Instructions BT324 3-- 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.4.1 Display 3-- 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....
Page 5 - ELECTRICAL; LIST OF FIGURES
iii T-- 304 04/08 TABLE OF CONTENTS Continued: 5.13 SERVICING THE LIQUID LINE SOLENOID VALVE 5-- 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.13.1 Coil Replacement 5-- 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....
Page 6 - iv; LIST OF FIGURES Continued:; Figure 6-- 10 CSDD BT324 Condenser Motors; LIST OF TABLES; Table 4-- 1 General System Troubleshooting Procedures
iv T-- 304 04/08 LIST OF FIGURES Continued: Figure 6-- 4 Evaporator Motors 1 -- 4 6-- 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 6-- 5 Evaporator Motors 5 -- 8 6-- 6 . . . . . . . . . . . . . . . . . . . . . . . ...
Page 7 - SAFETY SUMMARY; GENERAL SAFETY NOTICES; Always wear safety glasses.; MAINTENANCE PRECAUTIONS
Safety-- 1 T-- 304 04/08 SAFETY SUMMARY GENERAL SAFETY NOTICES The following general safety notices supplement the specific warnings and cautions appearing elsewhere in thismanual. They are recommended precautions that must be understood and applied during operation and maintenanceof the equipment c...
Page 10 - GENERAL DESCRIPTION; Condenser Section
1-- 2 T-- 304 04/08 1.2 GENERAL DESCRIPTION 1.2.1 Rooftop Unit The rooftop unit includes the condenser section and the evaporator section (See Figure 1-- 1). AC310 AC350 Condenser Section Evaporator Section Condenser Section Evaporator Section Figure 1-- 1 AC310/350 Rooftop Units 1.2.2 Condensing Se...
Page 11 - Dual Loop
1-- 3 T-- 304 04/08 1 2 3 4 5 7 8 4 5 6 1 3 3 2 9 9 AC310 Dual Loop 9 1. Condenser Coil Assembly 2. Receiver 3. Service Valve (High Side) 4. Filter Drier Upper Support 5. Filter Drier 6. Filter Drier Lower Support 7. Condenser Fan and Motor Assembly 8. Condenser Motor Support 9. Discharge Line Check...
Page 12 - NOTE
1-- 4 T-- 304 04/08 1 2 3 4 5 1 2 4 4 5 1 Condenser Coil AssemblyReceiver Tank (Part Of Coil Assembly) 2 Service Valve 3 Filter Drier 4 Fan & Motor 5 Frame (Aluminum) Figure 1-- 3 Condensing Section Components (AC350 Single Loop -- GEN II) 1.2.3 Evaporator Section The dual loop AC310 & AC350...
Page 19 - Relief Valve
1-- 11 T-- 304 04/08 EVAPORATOR CONDENSER Relief Valve Dash AirLiquid Line Discharge LiquidSuctionCoolant Dash AirSuction Line 1 2 5 6 7 8 9 10 11 9 8 6 5 Discharge Check Valve 3 3 4 4 4 Figure 1-- 8 Refrigerant Flow Diagram, Cooling (Single Loop) AC350 1. Thermal Expansion Valve 2. Liquid Line Sigh...
Page 21 - LEGEND
1-- 13 T-- 304 04/08 1 V1, Diode, Dash Switch 2 V2, Diode, Dash Switch 3 V3, Diode, Dash Switch 4 V4, Diode, Thermostat, Cooling 5 V5, Diode, Thermostat, Heating 6 Thermostat 7 Return Air Sensor 8 K1M, Relay, Evaporator Low Speed 9 K2M, Relay, Evaporator High Speed 10 K3M, Relay, Evaporator High spe...
Page 24 - SECTION 2
2-- 1 T-- 304 04/08 SECTION 2 OPERATION (MANUAL CONTROLLER) 2.1 STARTING, STOPPING AND OPERATINGINSTRUCTIONS The control switches supplied by Carrier Transport AirConditioning will be marked with international symbols(See Figure 2.1). Before starting, electrical power must be available fromthe bus p...
Page 27 - a. Listen for abnormal noises in compressor or fan mo-
3-- 1 T-- 304 04/08 SECTION 3 OPERATION BT324 CONTROLLER 3.1 STARTING, STOPPING AND OPERATINGINSTRUCTIONS The BT324 Carrier Sutrak Digital Display (CSDD) ismarked with international symbols (See Figure 3-- 2). Before starting, electrical power must be available fromthe bus power supply (See Figure 3...
Page 29 - sensor is not installed, or when there is a sensor failure.; CHANGING BETWEEN; F or the mode “Cel” for temperatures in
3-- 3 T-- 304 04/08 However, the blowers may be switched to manual modeof operation by pressing the blower key. Press the Plus or Minus keys to define one of 5 differentblower steps. The blowers can not be switched OFFwhen Automatic Climate Control is ON. When Automatic Climate Control is OFF, the b...
Page 32 - WARNING
T-304 5-- 1 04/08 SECTION 5 SERVICE WARNING Be sure to observe warnings listed in the safety summary in the front of this manual before perform-ing maintenance on the hvac system WARNING Read the entire procedure before beginning work. Park the coach on a level surface, with parkingbrake applied. Tu...
Page 33 - CAUTION
T-304 5-- 2 04/08 CAUTION The AC310 & AC350 Rooftop Systems haveR134a service port couplings installed onthe compressor and 1/4 inch flare (Acme)fittings installed on the unit piping. 5.4.1 Installing R-- 134a Manifold Gauge/Hose SET An R-- 134a manifold gauge/hose set with self-- sealinghoses i...
Page 34 - REFRIGERANT LEAK CHECK
T-304 5-- 3 04/08 5.5 PUMPING THE SYSTEM DOWN OR REMOV-ING THE REFRIGERANT CHARGE NOTE To avoid damage to the earth’s ozone layer, usea refrigerant recovery system whenever remov-ing refrigerant. 5.5.1 System Pump Down For Low Side Repair To service or replace the filter-- drier, pump therefrigerant...
Page 36 - Checking High Or Low Pressure Switches; Figure 5-- 4 Checking High Pressure Switch
T-304 5-- 5 04/08 5.10.2 Checking High Or Low Pressure Switches WARNING Do not use a nitrogen cylinder without a pres-sure regulator WARNING Do not use oxygen in or near a refrigeration sys-tem as an explosion may occur. a. Disconnect wiring and remove switch from system. b. Connect an ohmmeter acro...
Page 41 - j. The superheat may cycle from a low to high reading.
T-304 5-- 10 04/08 j. The superheat may cycle from a low to high reading. Monitor the superheat taking readings every 3-- 5 min-utes for a total of 5-- 6 readings. Calculate the super-heats, add the readings and divide by the number of readings taken to determine average superheat. Thesuperheat shou...
Page 43 - INTRODUCTION; condenser; UNIT; Thermostat With Manual Reheat
6-- 1 T-- 304 04/08 SECTION 6 ELECTRICAL 6.1 INTRODUCTION This section includes electrical wiring schematics. Theschematics shown in this section provides informationfor the AC310 and AC350 model rooftop air conditioningunits which are fitted with eight (8) and twelve (12)single-- shafted or four (4...
Page 44 - FOM
6-- 2 T-- 304 04/08 C ONDE NSE R E V APOR A T OR C ONT R O L PANE L VE R S IO N A VE R S IO N B Op er at io n B o ar d Op er at io n B o ar d A L TE R N A TO R W A TE R P U M P H E A TI N G H E A T IN G V AL VE S1 A S2 A S3 A S1 A R1 N R2 N FOM A C 310 100A @ 24V D C A C 350 125A @ 24V D C Ba tt e r...
Page 45 - OEM
6-- 3 T-- 304 04/08 WH OG OGR D Y1 A 2 BK RD BKYE BKBU UH WH X3 V4 S1 A R1 N B1 N 34 5 V2 V1 7 1 3 RDWH WH YE WH WHRD BN WH K1 A U2 F1 A 15A 85 30 86 87a 87 12 U5 sw or or WH BU BKG Y V5 1 Ins ide s ens or T e mper atur e s etti ng Liquid L ine V a lv e V3 K4 A WH Y2 A U3 OGR D B+ B+ X2 0 91011 WH U...
Page 47 - RE; Figur
6-- 5 T-- 304 04/08 F 01M BATTER Y 1 2 VD C 5 MM K4 M BK BU 6 WH OG BN F4 M WH GN F3 M K5 M 15A K6 M BK GN M3M M 4M 15A BN 4 30 87 86 85 85 86 87 30 1 BN -- -- BK RD 15A M2M M1M GN K3 M 15A K2 M U2 F1 M U4 WH YE + B+ F2 M BN 2 M K1 M BK BU 3 WHRD BL AC K X2 150 A M P BK YE BK BU GN BK OG BK WH BK GN...
Page 50 - BT; AL
6-- 8 T-- 304 04/08 C ONDE NSE R E V APOR A T OR C ONT R O L PANE L A L TE R N A TO R W IT H D ASH SWI T C H W A TE R P U M P H E A TI N G H E A T IN G V AL VE M 31M Y31A Y 7 M C ompr es s o r C lut c h C o nv ec ti on H eati n g C onnec ti o n HP S w it c h LP S w it c h BT 324 UNL OA DE R AL T UL ...
Page 51 - CONTROL
6-- 9 T-- 304 04/08 CONT ROL L E R B T 324 OP T ION O U T S ID E SEN SO R IN SI D E SEN SO R CONTROL P ANEL RE F : 98 -- 62668 -- 00 (R AS) (A TS ) 5A 5A 5A 05G -- 05K O P T IO N C o m p re sso r Cl u tc h 05G WP HS V WP -- W A T E R P U M P HS V -- H E A T ING S O L E NO ID V A L V E U 2 -- EV APO ...
Page 53 - MM
6-- 11 T-- 304 04/08 U1 U2 Ure g U4 15A U4 A X1 6 X2 8 9 7 W HRD BU RDB U WH G N BU WH CO NT RO L P A N E L +U 4 A UV d Ur e g UK o UF ri 1pol . 1pol . 15A 15A 15A 15A 15A 15A F 13M F 14M F 15M F 16M F 17M F 18M 30 85 86 87a 87 87a 30 85 87 86 30 85 87a 87 86 K9 M K8 M K7 M X1 10 13 14 15 12 1 1 CO ...
Page 56 - DRM; or; ig
6-- 14 T-- 304 04/08 Input P o w e r G round N ight Li ght A lter nator 5A 5A 5A C o mpr e s s o r F ai lu re S ignal (O pti onal ) C o m p re sso r Cl u tc h Fre e W heel in g D iode P re ssu re S w it c hes Load Re la y a) B low er O N b) B low er S peed 1 Fre s h A ir Va lv e B low er Motor M B l...
Page 57 - EV; eg
6-- 15 T-- 304 04/08 B A TTER Y 2 4 VDC EV APORA T O R M OT ORS IN S T A LLE D B LO W E R S A C 310 A C 350 M1M -- M 8M M1M -- M 12M BN 6 -- + 30 86 85 87a 87 K1M K 2M K3M K4M K5M K 6M 30 86 87a 87 85 87a 87 85 30 86 30 86 87a 87 85 87a 87 85 30 86 30 86 87a 87 85 F1 M 10A 10A 10A 10A 10A 10A 10A 10...
Page 60 - MPR
6-- 18 T-- 304 04/08 U N IT W IT H 2 C O MPR ESSO R S U3 3/B 1 5 10A F2 A X20 X5 11 1 2 GN X3. 5 10A F3A 2 1 3 10 7 5 30 86 85 87a 87 K7A Op ti o n Y6A Y7A B2 F B 21F Li qui d L in e V al v e s LP --S w it c h HP --S w it c h 4 2 1 1 4 2 U N IT W IT H 1 C O MPR ESSO R U3 3/B 1 5 F2A 10A X3. 5 F3A 31...
Page 62 - INDEX
Index -- 1 T-- 304 04/08 INDEX A Air Filters, 5-- 7 Apex Unit, 1-- 2 C Circuit Breaker, 1-- 8 Clutch, 2-- 3 Compressor, 1-- 6, 1-- 7 Compressor Clutch Control, 2-- 3 Condenser Fan, 1-- 8 Condensing Section, 1-- 2 Cooling Mode, 2-- 2 D DESCRIPTION, 1-- 1 E ELECTRICAL, 6-- 1 Evacuation, 5-- 3 Evaporat...
