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Carrier 50TCQD17-D24, Service And Maintenance Instructions, Page: 34 / 60

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Carrier 50TCQD17-D24 Service And Maintenance Instructions Download Page 34

34

Remote Test/Reset Station’s Trouble LED Does Not

flash When Performing a Dirty Test, But the Control-

ler’s Trouble LED Does:

1. Verify that the remote test/station is wired as shown

in Fig. 47. Repair or replace loose or missing wiring.

2. Configure the sensor dirty test to activate the control-

ler’s supervision relay. See “To Configure the Dirty

Sensor Test Operation” for details.

Sensor’s Trouble LED is On, But the Controller’s

Trouble LED is OFF:

Remove JP1 on the controller.

Supply Air Temperature (SAT) Sensor —

On

FIOP--equipped 50HCQ unit, the unit is supplied with a

supply--air temperature (SAT) sensor (p/n:33ZCSENSAT).

This sensor is a tubular probe type, approx 6--inches (12.7

mm) in length. It is a nominal 10--k ohm thermistor. See

PremierLink

t

Installation, Start--Up and Configuration

Instructions

. for temperature--resistance characteristic.

PREMIERLINK

CONTROL

The PremierLink controller, Fig. 50 is compatible with

Carrier Comfort Network

r

(CCN) devices. This control is

designed to allow users the access and ability to change

factory--defined settings, thus expanding the function of

the standard unit control board. CCN service access tools

include System Pilot

t

, Touch Pilot

t

and Service Tool.

Standard tier display tools Navigator

t

and Scrolling

Marquee are not suitable for use with latest PremierLink

controller (Version 2.x).

The PremierLink control is factory--mounted in the

50TCQ unit’s main control box to the left of the CTB.

Factory wiring is completed through harnesses connected

to the LVTB. Field connections are made at a 16--pole

terminal block (TB1) located on the bottom shelf of the

unit control box in front of the PremierLink controller The

factory--installed PremierLink control includes the

supply--air temperature (SAT) sensor. The outdoor air

temperature

(OAT)

sensor

is

included

in

the

FIOP/accessory EconoMi$er 2 package.

Refer to Fig. 50 for PremierLink connection locations.

NOTE

: Refer to

PremierLink

t

Installation, Start--Up

and Configuration Instructions

. Have a copy of this

manual available at unit start--up.

C08199

Fig. 50 -- PremierLink Controller

Summary of Contents for 50TCQD17-D24

Page 1: ...aintenance functions such as replacing filters Trained service personnel should perform all other service and maintenance operations When working on air conditioning equipment observe precautions in the literature tags and labels attached to the unit and other safety precautions that can apply Follow all safety codes Wear approved safety glasses and leather work gloves Use quenching cloth for unbr...

Page 2: ...uld cause personal injury death and or equipment damage Puron R 410A refrigerant systems operate at higher pressures than standard R 22 systems Do not use R 22 service equipment or components on Puron refrigerant equipment WARNING WARNING FIRE EXPLOSION HAZARD Failure to follow this warning could result in death serious personal injury and or property damage Never use air or gases containing oxyge...

Page 3: ...or dirt and debris Air Filters and Screens Each unit is equipped with return air filters If the unit has an economizer it also has an outside air screen If a manual outside air damper is added it also has an inlet air screen Each of these filters and screens will need periodic cleaning or replacement Return Air Filters EQUIPMENT DAMAGE HAZARD Failure to follow this CAUTION can result in premature ...

Page 4: ...g a spring force tool such as Browning s Belt Tension Checker p n 1302546 or equivalent tool tension should be 6 lbs at a 5 8 in 1 6 cm deflection when measured at the centerline of the belt span This point is at the center of the belt when measuring the distance between the motor shaft and the blower shaft NOTE Without the spring tension tool place a straight edge across the belt surface at the p...

Page 5: ...ed ductwork systems The pulley consists of a fixed flange side that faces the motor secured to the motor shaft and a movable flange side that can be rotated around the fixed flange side that increases or reduces the pitch diameter of this driver pulley See Fig 7 C07075 Fig 7 Supply Fan Pulley Adjustment As the pitch diameter is changed by adjusting the position of the movable flange the centerline...

Page 6: ...ure to follow this warning could cause personal injury death and or equipment damage This system uses PuronR R410A refrigerant that operates at higher pressures than standard R 22 systems and other refrigerants No other refrigerant can be used in this system Gauge set hoses and recovery system must be designed to handle Puron refrigerant If unsure about equipment consult the equipment manufacturer...

Page 7: ...ammable hypoallergenic non bacterial and a USDA accepted biodegradable agent that will not harm the coil or surrounding components such as electrical wiring painted metal surfaces or insulation Use of non recommended coil cleaners is strongly discouraged because coil and unit durability can be affected Clean coil as follows 1 Turn off unit power Use Lockout Tagout procedures on unit power switch 2...

Page 8: ... deep into finned areas 8 Interior and exterior finned areas must be thoroughly cleaned 9 Finned surfaces should remain wet with cleaning solution for 10 minutes 10 Ensure surfaces are not allowed to dry before rinsing Reapply cleaner as needed to ensure 10 minute satur ation is achieved 11 Thoroughly rinse all surfaces with low velocity clean water using downward rinsing motion of water spray noz...

Page 9: ...check valve which blocks further flow The hot gas exits the header through the tubes above the check valve and enters these coil circuits At the outlet of these desuperheating and condensing circuits the refrigerant enters the Accutrol tees from the coil end The refrigerant exits the tee at the side port and enters the liquid transfer header see Fig 14 The refrigerant moves through the liquid tran...

Page 10: ...ch evaporator coil circuit path These metering devices are non adjustable Service requires replacing the entire liquid header assembly Check for possible blockage of one or more of these metering devices by creating a low load condition on the evaporator function coil and then observing the frosting pattern on the finned portion of the coil To check the indoor coil disconnect the supply fan signal...

Page 11: ...refrigerant in the bulb pushing downward on the diaphragm which opens the valve using the push rods As long as this bulb and cap tube contain any liquid refrigerant this temperature is converted into suction pressure pushing downward on the diaphragm which tends to open the TXV valve through the push rods 2 The suction pressure at the outlet of the evaporator coil is transferred through the extern...

Page 12: ...from vapor tube inside cabinet 6 Install the new TXV and avoid damaging the tubing or the valve when attaching the TXV to the distributor 7 Attach equalizer tube to suction line If coil has mechanical connection then use wrench and back up wrench to attach If coil has brazed connection use file or tubing cutters to remove mechanical flare nut from equalizer line Then use coupling to braze the equa...

Page 13: ...out a dip tube invert the cylinder access valve on the bottom when removing liquid refrigerant Because Puron R 410A refrigerant is a blend it is strongly recommended that refrigerant always be removed from the cylinder as a liquid Add liquid refrigerant into the system in the discharge line If adding refrigerant into the suction line use a commercial metering expansion device at the gauge manifold...

Page 14: ...e the Curve Remove Charge if Below the Curve 50HE501614 A C12025 Fig 21 Cooling Charging Chart 50TCQ D17 Circuit A OVERCHARGING UNIT INCREASES THE RISK OF NUISANCE HIGH PRESSURE SWITCH TRIPS CAUTION DO NOT OVERCHARGE UNIT 15 TON HEAT PUMP CHARGING CHART R410A REFRIGERANT COOLING MODE CIRCUIT B 20 40 60 80 100 120 140 150 200 250 300 350 400 450 500 550 600 Compressor Discharge Pressure psig Outdoo...

Page 15: ... AND RECHARGE UNIT PER NAMEPLATE 50HE501616 A C12027 Fig 23 Cooling Charging Chart 50TCQ D24 Circuit A OVERCHARGING UNIT INCREASES THE RISK OF NUISANCE HIGH PRESSURE SWITCH TRIPS CAUTION DO NOT OVERCHARGE UNIT 20 TON HEAT PUMP CHARGING CHART R410A REFRIGERANT COOLING CODE CIRCUIT B 20 40 60 80 100 120 140 150 200 250 300 350 400 450 500 550 600 650 Compressor Discharge Pressure psig Outdoor Coil L...

Page 16: ...ors it is important to be certain compressor is rotating in the proper direction To determine whether or not compressor is rotating in the proper direction 1 Connect service gauges to suction and discharge pres sure fittings 2 Energize the compressor 3 The suction pressure should drop and the discharge pressure should rise as is normal on any start up NOTE If the suction pressure does not drop and...

Page 17: ...or indoor fan heating motor or capacitor Replace Restriction in refrigerant system Locate restriction and remove Compressor Operates Continuously Dirty air filter Replace filter Unit undersized for load Decrease load or increase unit size Thermostat set too low cooling Reset thermostat Low refrigerant charge Locate leak repair and recharge Air in system Recover refrigerant evacuate system and rech...

Page 18: ...keyhole slots and align with the gasket tighten the two screws until snug do not over tighten 4 Mount the weatherproof cover to the backing plate as shown in Fig 27 5 Remove two slot fillers in the bottom of the cover to permit service tool cords to exit the cover 6 Check cover installation for full closing and latching TOP TOP TOP WET LOCATIONS WET LOCA TIONS COVER WHILE IN USE WEATHERPROOF BASEP...

Page 19: ...n to clear the tripped condition The Fuse on the powered type The factory fuse is a Cooper Bussmann Fusetron T 15 non renewable screw in Edison base type plug fuse Using unit mounted convenience outlets Units with unit mounted convenience outlet circuits will often require that two disconnects be opened to de energize all power to the unit Treat all units as electrically energized until the conven...

Page 20: ... is a snap action over temperature protection device that is imbedded in the motor windings It is a pilot circuit device that is wired into the unit s 24V control circuit When this switch reaches its trip set point it opens the 24V control circuit and causes all unit operation to stop This device resets automatically when the motor windings cool Do not bypass this switch to correct trouble Determi...

Page 21: ...TL BRD 8 C Common 24Vac P3 2 CONTL BRD 4 DFT1 DI 24Vac DFT 1 to DFT 1 DFT 2 DI 24Vac DFT 2 to DFT 2 Outputs Point Name Type of I O Connection Pin Number Unit Connection Note IFO Fan On DO 24Vac P3 9 REHEAT 2 OF OD Fan On DO 24Vac OF OFR RVS1 DO 24Vac P3 7 to P3 5 Energize in COOL RVS2 DO 24Vac P3 6 to P3 4 Energize in COOL COMP 1 DO 24Vac P3 10 FPT REHEAT 6 COMP 2 DO 24Vac P3 8 REHEAT 8 HEAT 2 DO ...

Page 22: ...the control repeats the continuous run period If DFT1 is closed the defrost cycle is initiated The defrost period will end when DFT1 opens indicating the outdoor coil has been cleared of frost and ice or a 10 minute elapsed period expires whichever comes first On unit sizes 08 and 09 two circuit designs DFT2 located on the bottom circuit of the outdoor coil controls the start and termination of th...

Page 23: ...ar in design with heater frames holding open coil resistance wires strung through ceramic insulators line break limit switches and a control contactor One or two heater modules may be used in a unit Heater modules are installed in the Heater Section access panel located just below the Blower access panel Heater modules slide into the compartment on tracks along the bottom of the heater opening See...

Page 24: ... 2 CRHEATER244A00 50TCQ D17 24 460 400 3 60 50 75 52 Vertical 2 CRHEATER245A00 50TCQ D17 24 575 3 60 25 Vertical 2 CRHEATER246A00 50TCQ D17 24 575 3 60 50 Vertical 2 CRHEATER247A00 50TCQ D17 24 575 3 60 75 Vertical 2 kW rated at 240 480 400 and 600 volts C09423 Fig 35 Typical Module Installation Table 9 Heater Model Number Bare Heater Model Number C R H E A T E R 0 0 1 A 0 0 Heater Sales Package P...

Page 25: ...n inside the empty Single Point Box using UL approved connectors Safety Devices Electric heater applications use a combination of line break auto reset limit switches and a pilot circuit manual reset limit switch to protect the unit against over temperature situations Line break auto reset limit switches are mounted on the base plate of each heater module See Fig 34 These are accessed through the ...

Page 26: ...Cover Cover Gasket ordering option Terminal Block Cover Conduit Support Plate Conduit Nuts supplied by installer Duct Smoke Sensor Controller C08208 Fig 39 Controller Assembly Controller The controller see Fig 39 includes a controller housing a printed circuit board and a clear plastic cover The controller can be connected to one or two compatible duct smoke sensors The clear plastic cover is secu...

Page 27: ...ilter accessed through the lift off filter panel SUPPLY AIR SMOKE DETECTOR SENSOR C10325 Fig 41 Typical Supply Air Smoke Detector Sensor Location Return Air without Economizer The sampling tube is located across the return air opening on the unit base pan See Fig 42 The holes in the sampling tube face downward into the return air stream The sampling tube is connected by tubing to the return air se...

Page 28: ...shut down all unit operations when a smoke condition is detected See Fig 46 Typical Smoke Detector System Wiring Highlight A JMP 3 is factory cut transferring unit control to smoke detector Highlight B Smoke detector NC contact set will open on smoke alarm condition de energizing the ORN conductor S For units with an economizer the sampling tube is integrated into the economizer housing but the co...

Page 29: ...KOUT LOCATION FOR VERTICAL KNOCKOUT LOCATION FOR HORIZONTAL HORIZONTAL ASSEMBLY PICK UP TUBE BRACKET EMT TO SEAL TIGHT CONNECTOR SMOKE SAMPLING BOX EXPLODED DETAIL SCREW 2 C09685 Fig 45 Supply Air Smoke Detector Sensor Location ...

Page 30: ...fy that the sensor s Alarm Light Emitting Diode LED turns on 3 Reset the sensor by holding the test magnet against the sensor housing for two seconds 4 Verify that the sensor s Alarm LED turns off Controller Alarm Test The controller alarm test checks the controller s ability to initiate and indicate an alarm state OPERATIONAL TEST NOTICE Failure to follow this NOTICE can result in an unnecessary ...

Page 31: ...etector into the alarm state and activate all automatic alarm responses Before changing dirty sensor test operation disconnect all auxiliary equipment from the controller and notify the proper authorities if connected to a fire alarm system NOTICE Changing the Dirty Sensor Test By default sensor dirty test results are indicated by S The sensor s Dirty LED flashing S The controller s Trouble LED fl...

Page 32: ...etector into the alarm state and activate all automatic alarm responses NOTICE Dirty Sensor Test Using an SD TRK4 1 Turn the key switch to the RESET TEST position for two seconds 2 Verify that the test reset station s Trouble LED flashes Table 11 Detector Indicators CONTROL OR INDICATOR DESCRIPTION Magnetic test reset switch Resets the sensor when it is in the alarm or trouble state Activates or t...

Page 33: ... Condition Trips Manual reset is required to restore smoke detector systems to Normal operation For installations using two sensors the duct smoke detector does not differentiate which sensor signals an alarm or trouble condition Check each sensor for Alarm or Trouble status as indicated by the LEDs Clear the condition that has generated the trip at this sensor Then reset the sensor by pressing an...

Page 34: ... Networkr CCN devices This control is designed to allow users the access and ability to change factory defined settings thus expanding the function of the standard unit control board CCN service access tools include System Pilott Touch Pilott and Service Tool Standard tier display tools Navigatort and Scrolling Marquee are not suitable for use with latest PremierLink controller Version 2 x The Pre...

Page 35: ...RTU OPEN must be routed through the raceway built into the corner post of the unit or secured to the unit control box with electrical conduit The unit raceway provides the UL required clearance between high and low voltage wiring Pass the control wires through the hole provided in the corner post then feed the wires thorough the raceway to the RTU OPEN Connect the wires to the removable Phoenix co...

Page 36: ...36 C10818 Fig 51 RTU OPEN Control Module 50TCQ ...

Page 37: ... PERSONAL INJURY AND ENVIRONMENTAL HAZARD Failure to follow this warning could result in personal injury or death Wear approved safety glasses and leather gloves when handling refrigerants Relieve pressure and recover all refrigerant before system repair or final unit disposal Keep torches and other ignition sources away from refrigerants and oils WARNING 3 Perform the following inspections a Insp...

Page 38: ...energize to the compressor Check pressures The suction and discharge pressure levels should now move to their normal start up levels NOTE When the compressor is rotating in the wrong direction the unit will make an elevated level of noise and will not provide cooling Refrigerant Service Ports Each unit system has two 1 4 SAE flare with check valves service ports one on the suction line and one on ...

Page 39: ...properly connected and securely tightened 2 At the unit check fan and system controls for proper operation 3 At the unit check electrical system and connections of any optional electric reheat coil 4 Ensure all area around the unit is clear of construction dirt and debris 5 Ensure final filters are installed in the unit Dust and debris can adversely affect system operation 6 Verify the PremierLink...

Page 40: ...tions Outdoor Indoor Hail Guard A Al Cu Al Cu B Precoat Al Cu Al Cu C E coat Al Cu Al Cu D E coat Al Cu E coat Al Cu E Cu Cu Al Cu F Cu Cu Cu Cu M Al Cu Al Cu Louvered Hail Guards N Precoat Al Cu Al Cu Louvered Hail Guards P E coat Al Cu Al Cu Louvered Hail Guards Q E coat Al Cu E coat Al Cu Louvered Hail Guards R Cu Cu Al Cu Louvered Hail Guards S Cu Cu Cu Cu Louvered Hail Guards Base unit contro...

Page 41: ...ize 56 56 Fan Qty Type 2 Centrifugal 2 Centrifugal Fan Diameter in 15 x 15 15 x 15 Medium Static Motor Qty Drive type 1 Belt n a Max BHP 3 3 n a RPM range 679 863 n a Motor frame size 56 n a Fan Qty Type 2 Centrifugal n a Fan Diameter in 15 x 15 n a High Static Motor Qty Drive type 1 Belt n a Max BHP 4 9 n a RPM range 826 1029 n a Motor frame size 56 n a Fan Qty Type 2 Centrifugal n a Fan Diameter...

Page 42: ...a 1 Belt Max BHP n a 6 5 6 9 7 0 8 3 RPM range n a 835 1021 Motor frame size n a 184T Fan Qty Type n a 2 Centrifugal Fan Diameter in n a 15 x 15 High Static High Eff Motor Qty Drive type n a 1 Belt Max BHP n a 10 5 11 9 11 9 11 0 RPM range n a 941 1176 Motor frame size n a 213T Fan Qty Type n a 2 Centrifugal Fan Diameter in n a 15 x 15 Cond Coil Circuit A Coil type RTPF RTPF Coil Length in 70 82 C...

Page 43: ...9 6 45 6 057A00 057A00 057A00 057A00 287 278A00 74 4 68 3 057A00 057A00 057A00 057A00 50TCQ 24 208 203 3 60 STD 279 A00 25 0 18 8 23 0 056A00 056A00 056A00 056A00 280 A00 50 0 37 6 45 9 056A00 056A00 056A00 056A00 281 A00 75 0 56 3 68 9 056A00 056A00 056A00 056A00 MED High Efficiency 279 270A00 25 0 18 8 23 0 056A00 056A00 056A00 056A00 280 271A00 50 0 37 6 45 9 056A00 056A00 056A00 056A00 281 272...

Page 44: ...A00 057A00 HIGH 285 276A00 24 8 22 8 286 277A00 49 6 45 6 057A00 057A00 057A00 057A00 287 278A00 74 4 68 3 057A00 057A00 057A00 057A00 50TCQ 24 208 203 3 60 STD 279 A00 25 0 18 8 23 0 056A00 056A00 056A00 056A00 280 A00 50 0 37 6 45 9 056A00 056A00 056A00 056A00 281 A00 75 0 56 3 68 9 056A00 056A00 056A00 056A00 MED 279 270A00 25 0 18 8 23 0 056A00 056A00 056A00 056A00 280 271A00 50 0 37 6 45 9 05...

Page 45: ...50HE502048 B 460 3 60 50HE500937 G 50HE502045 B 575 3 60 50HE500937 G 50HE502045 B All RTU OPEN 50HE501687 B 50HE500751 J All PremierLink 48TM500891 F 50HE500751 J NOTE Component arrangement on Control Legend on Power Schematic PremierLink and RTU OPEN control labels overlay a portion of the base unit control label The base unit label drawing and the control option drawing are required to provide ...

Page 46: ...46 APPENDIX IV WIRING DIAGRAMS cont C150373 Fig 52 50TCQ D17 Power Wiring Diagram 208 230 3 60 ...

Page 47: ...47 APPENDIX IV WIRING DIAGRAMS cont C12399 Fig 53 50TCQ D17 Power Wiring Diagram 460 3 60 575 3 60 ...

Page 48: ...48 APPENDIX IV WIRING DIAGRAMS cont C12686 Fig 54 50TCQ D24 Power Wiring Diagram 208 230 3 60 ...

Page 49: ...49 APPENDIX IV WIRING DIAGRAMS cont C12401 Fig 55 50TCQ D24 Power Wiring Diagram 460 3 60 575 3 60 ...

Page 50: ...50 APPENDIX IV WIRING DIAGRAMS cont C160004 Fig 56 50TCQ D17 D24 Control Wiring Diagram 208 3 60 460 3 60 575 3 60 ...

Page 51: ...51 APPENDIX IV WIRING DIAGRAMS cont C160005 Fig 57 RTU OPEN Control Diagram ...

Page 52: ...52 APPENDIX IV WIRING DIAGRAMS cont 50HE500891 F 50HE500751 J Fig 58 PremierLinktWiring Diagram ...

Page 53: ...arrier s motors please see the Application Data section of this book Table 18 Economizer Vertical and Horizontal Duct Configuration Model Sizes 17 and 24 CFM 4500 5000 5500 6000 6500 7000 7500 8000 0 047 0 052 0 057 0 062 0 067 0 072 0 077 0 082 Model Sizes 17 and 24 CFM 8500 9000 9500 10000 10500 11000 11500 12000 12500 0 088 0 093 0 098 0 103 0 109 0 114 0 119 0 125 0 131 Table 19 Electric Heate...

Page 54: ... and Drive 514 680 RPM Max BHP 2 9 Medium Static Motor and Drive 679 863 RPM Max BHP 3 7 High Static Motor and Drive 826 1009 RPM Max BHP 4 9 Outside operating range Boldface requires alternate static drive package ITALIC requires high static drive package with different motor pulley Table 21 50TCQD17 15 TON HORIZONTAL SUPPLY RETURN CFM Available External Static Pressure in wg 0 2 0 4 0 6 0 8 1 0 ...

Page 55: ... Boldface requires alternate static drive package ITALIC requires high static drive package with different motor pulley Table 23 50TCQD24 20 TON HORIZONTAL SUPPLY RETURN CFM Available External Static Pressure in wg 0 2 0 4 0 6 0 8 1 0 RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP 6000 580 2 04 643 2 61 702 3 22 756 3 88 806 4 58 6500 617 2 49 677 3 09 733 3 74 785 4 44 833 5 17 7000 656 3 01 712 3 65 76...

Page 56: ...6 1153 1129 1106 1082 1059 1035 1012 988 965 941 NOTE Do not adjust pulley further than 5 turns open Factory settings Table 25 PULLEY ADJUSTMENT Horizontal airflow units UNIT MOTOR DRIVE COMBO MOTOR PULLEY TURNS OPEN 0 0 0 5 1 0 1 5 2 0 2 5 3 0 3 5 4 0 4 5 5 0 17 Standard Static 680 663 647 630 614 597 580 564 547 531 514 Medium Static 780 763 747 730 714 697 680 664 647 631 614 High Static 912 89...

Page 57: ...57 APPENDIX VI MOTORMASTER SENSOR LOCATIONS SENSOR LOCATION C12035 Fig 59 50TCQD17 and 50TCQD24 Motormaster Sensor Location ...

Page 58: ...p S 7310 W Morris St S Indianapolis IN 46231 Edition Date 02 16 Manufacturer reserves the right to change at any time specifications and designs without notice and without obligations Catalog No 50TCQ 17 24 01SM Replaces 50TCQ 02SM ...

Page 59: ...ION IN HOUSING ORIFICE AND SETSCREW TIGHTNESS j CHECK TO ENSURE THAT ELECTRICAL WIRING IS NOT IN CONTACT WITH REFRIGERANT LINES OR SHARP METAL EDGES j CHECK PULLEY ALIGNMENT AND BELT TENSION PER INSTALLATION INSTRUCTIONS III START UP ELECTRICAL SUPPLY VOLTAGE L1 L2 L2 L3 L3 L1 CIRCUIT 1 COMPRESSOR AMPS L1 L2 L3 CIRCUIT 2 COMPRESSOR AMPS L1 L2 L3 INDOOR FAN AMPS L1 L2 L3 OUTDOOR FAN AMPS NO 1 NO 2 ...

Page 60: ...p S 7310 W Morris St S Indianapolis IN 46231 Edition Date 02 16 Manufacturer reserves the right to change at any time specifications and designs without notice and without obligations Catalog No 50TCQ 17 24 01SM Replaces 50TCQ 02SM ...

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