Table of Contents
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38AU
Air-Cooled Condensing Units
50 Hz
®
with Puron
(R-410A) Refrigerant
Sizes 07 - 14
CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION GUIDELINES. . . . . . . . . . . . . . . . . . . . . . . 2
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-19
Step 1 – Plan for Unit Location . . . . . . . . . . . . . . . . . . . 9
Step 2 – Complete Pre-Installation Checks. . . . . . . . . . 9
Step 3 – Prepare Unit Mounting Support . . . . . . . . . . 9
Step 4 – Rig and Mount the Unit . . . . . . . . . . . . . . . . . . 9
Step 5 – Complete Refrigerant Piping Connections . . 10
Step 6 – Install Accessories. . . . . . . . . . . . . . . . . . . . . . 14
Step 7 – Complete Electrical Connections . . . . . . . . . 14
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
System Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Turn On Crankcase Heater . . . . . . . . . . . . . . . . . . . . . . 19
Preliminary Charge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
START-UP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 -25
38AU Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
OPERATING SEQUENCE. . . . . . . . . . . . . . . . . . . . . . . . . . 26
Indoor (Supply) Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Cooling, Unit Without Economizer . . . . . . . . . . . . . . . . 26
Cooling, Unit With Economizer . . . . . . . . . . . . . . . . . . . 26
Heating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
ROUTINE SYSTEM MAINTENANCE. . . . . . . . . . . . . . . 26
Quarterly Inspection (and 30 days after initial start) . . 26
Seasonal Maintenance . . . . . . . . . . . . . . . . . . . . . . . . 26
SERVICE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27 - 33
Refrigeration System . . . . . . . . . . . . . . . . . . . . . . . . . 27
Compressor Oil. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Servicing Systems on Roofs with
Synthetic Materials. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Liquid Line Filter Drier . . . . . . . . . . . . . . . . . . . . . . . . . 27
Filed Refrigerant Access Ports . . . . . . . . . . . . . . . . . 27
Factory High-flow Access Ports . . . . . . . . . . . . . . . . 27
Comfort Alert Diagnostic Module. . . . . . . . . . . . . . . 28
Crankcase Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Compressor Protection. . . . . . . . . . . . . . . . . . . . . . . . . . 30
Low-Pressure Switches . . . . . . . . . . . . . . . . . . . . . . . . . 30
High-Pressure Switches. . . . . . . . . . . . . . . . . . . . . . . . . 30
Outdoor Fans. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
NOVATION™ Coil Cleaning and Maintenance . . . . 33
Installation, Start-Up and
Service Instructions
Repairing NOVATION Condenser Tube Leaks . . . . 33
Replacing NOVATION Condenser Coil . . . . . . . . . . 33
Service Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 3
Fastener Torque Values . . . . . . . . . . . . . . . . . . . . . . . 33 3
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . 34 -35
APPENDIX A
Air Conditioner and Heat Pump with Puron
Quick Reference Guide . . . . . . . . . . . . . . . . . . . . . . . 36
APPENDIX B
Wiring Diagram List. . . . . . . . . . . . . . . . . . . . . . . . . 36
APPENDIX C
Motormaster Sensor Locations. . . . . . . . . . . . . . . . . 37
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . .CL-1, CL-2
SAFETY CONSIDERATIONS
Improper
installation,
adjustment,
maintenance, or use can cause explosion, fire, electrical shock
or other conditions which may cause personal injury or
property damage. Consult a qualified installer, service agency,
or your distributor or branch for information or assistance. The
qualified installer or agency must use factory-authorized kits or
accessories when modifying this product. Refer to the
individual instructions package
Follow all safety codes. Wear safety glasses and work gloves.
Use quenching cloths for brazing operations and have a fire
extinguisher available. Read these instructions thoroughly and
follow all warnings or cautions attached to the unit. Consult
local building codes for special requirements. In absence of
local codes, it is recommended that the (USA standard ANSI/
NFPA70, National Electrical Code (NEC), be followed.
It is important to recognize safety information. This is the
safety-alert symbol
. When you see this symbol on the unit
and in instructions or manuals, be alert to the potential for
personal injury.
Understand the signal words DANGER, WARNING,
CAUTION, and NOTE. These words are used with the safety-
alert symbol. DANGER identifies the most serious hazards
which will result in severe personal injury or death.
WARNING signifies hazards which could result in personal
injury or death. CAUTION is used to identify unsafe practices,
which may result in minor personal injury or product and
property damage. NOTE is used to highlight suggestions
which will result in enhanced installation, reliability, or
operation.
®
–
alteration,
service,
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Related Manuals for Carrier 38AUZ*07 Series
Summary of Contents for Carrier 38AUZ*07 Series
- Page 1 38AU Air-Cooled Condensing Units 50 Hz ® with Puron (R-410A) Refrigerant Sizes 07 - 14 Installation, Start-Up and Service Instructions CONTENTS SAFETY CONSIDERATIONS ..... . . 1 Repairing NOVATION Condenser Tube Leaks .
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Page 2: Installation Guidelines
Acid test – If the existing system is being replaced because of a compressor electrical failure, assume acid is in system. If system is being replaced for any other reason, use an approved acid test kit to determine acid level. If even low levels of acid ELECTRICAL SHOCK HAZARD are detected, install a 100 percent activated alumina suction- Failure to follow this warning could cause personal injury... - Page 3 Standard Corner Corner Corner Corner Center of Gravity Unit Height Weight UNIT lbs. lbs. lbs. lbs. lbs. 21.00 19.00 13.00 42.36 38AUZ*07 [533.4] [482.6] [330.2] [1076.0] 19.00 23.00 13.00 42.36 38AUZ*08 [482.6] [584.2] [330.2] [1076.0] 20.000 23.00 15.00 50.36 38AUD*12 [508.0] [584.2] [381.0]...
- Page 4 Table 1A — Physical Data — 38AUZ*07-08 Units — 50 Hz English UNIT SIZE 38AU Z*07 Z*08 NOMINAL CAPACITY (tons) OPERATING WEIGHTS (lb) Aluminum-Fin Coils R-410A ‡ REFRIGERANT TYPE † Operating Charge, Typical (lb) 12.3 Shipping Charge (lb) COMPRESSOR Qty...Type 1...Scroll OUTDOOR FANS Qty...Rpm...
- Page 5 Table 1B — Physical Data — 38AUZ*07-08 Units — 50 Hz SI UNIT SIZE 38AU Z*07 Z*08 21.1 26.4 NOMINAL CAPACITY (kW) OPERATING WEIGHT (kg) Aluminum-Fin Coils R-410A ‡ REFRIGERANT TYPE † Operating Charge, Typical (kg) Shipping Charge (kg) COMPRESSOR Qty...Type 1...Scroll OUTDOOR FANS...
- Page 6 Table 2A — Physical Data — 38AUD*12-14 Units — 50 Hz English UNIT SIZE 38AU D*12 D*14 12.5 NOMINAL CAPACITY (tons) OPERATING WEIGHTS (lb) Aluminum-Fin Coils R-410A ‡ REFRIGERANT TYPE † Operating Charge A/B, Typical (lb) 7.5/7.5 11.2/11.2 Shipping Charge A/B (lb) 3.0/3.1 3.7/3.9 COMPRESSOR...
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Page 7: Sizes
Table 2B — Physical Data — 38AUD*12-14 Units — 50 Hz SI UNIT SIZE 38AU D*12 D*14 35.1 NOMINAL CAPACITY (kW) OPERATING WEIGHT (kg) Aluminum-Fin Coils R-410A ‡ REFRIGERANT TYPE † Operating Charge A/B, Typical (kg) 3.4/3.4 5.1/5.1 Shipping Charge A/B (kg) 1.3/1.4 1.7/1.8 COMPRESSOR... - Page 8 3 8 A U Z A 0 7 A 0 G 9 – 0 A 0 A 0 _____________ ____ Model Type Packaging 38AU= Carrier Condensing Unit 0 = Standard Puronr R--- 410A Refrigerant 1 = LTL Type of Coil...
- Page 9 Matching 38AU Model To Evaporator Coil – Although unit is weatherproof, avoid locations that permit water from higher level runoff and overhangs to fall onto the The Model 38AUZ is a single-circuit unit design, requiring one unit. set of refrigeration piping. This model can be connected to an evaporator coil with one circuit or with two circuits (by mani- folding the evaporator connections into a single piping system).
- Page 10 IMPORTANT: Do not bury refrigerant piping underground. types. Also identify adjustments for refrigeration specialties. Refer to Part 3 of the Carrier System Design Manual for IMPORTANT: A refrigerant receiver is not provided with additional data and information on equivalent lengths.
- Page 11 Charge Quantity, lbs. Calculated for both liquid line sizes (where applicable), but only with larger suction line size (where applicable) NOTE: For applications with linear length greater than 100 ft (30.5 m), contact your local Carrier representative. Table 6 — 38AUD 12-14 Piping Recommendations (Two-Circuit Unit) NOTE: 38AUD requires TWO sets of refrigeration piping...
- Page 12 INSULATE SUCTION LINES — Apply closed-cell tubular insulation to all suction lines between evaporator coil 40RU Cooling 40RU Coil Connect to Arrangement Stage Segment 38AUD connection and 38AU unit’s suction service valve. Hot Gas Bypass – Hot gas bypass, if used, should be Circuit A Vertical Circuit B...
- Page 13 Table 9 — Refrigerant Specialities Part Numbers. LIQUID LINE LIQUID LINE LLSV SIGHT FILTER SIZE (in.) SOLENOID VALVE (LLSV) COIL GLASS DRIER ALC-066208 AMG-24/50-60 HMI-1TT3 Provided with unit ALC-066209 AMG-24/50-60 HMI-1TT4 See Table 8 ALC-066212 AMG-24/50-60 HMI-1TT5 38AUD units require TWO sets of parts. Refer to Table 9 for recommendations on refrigeration specialties.
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Page 14: Sizes
SUCTION CIRCUIT A CIRCUIT A For applications with linear line lengths greater than 100 ft SUCTION (30.5 m), contact your local Carrier representative. CIRCUIT B Dual Circuit Coil Piping Configuration Step 6 — Install Accessories For two circuit condensing units... -
Page 15: Convenience Outlets
NOTE: TEST LEADS - Unit may be equipped with short leads (pigtails) on the field line connection points on con- Units Without Disconnect Option tactor C or optional disconnect switch. These leads are for factory run-test purposes only; remove and discard before connecting field power wires to unit connection points. - Page 16 Convenience Outlet GFCI Pwd-CO Fuse Switch Pwd-CO Transformer Control Box Access Panel UNIT CONNECT PRIMARY TRANSFORMER Fig. 12 — Convenience Outlet Location VOLTAGE CONNECTIONS TERMINALS Non-powered type: This type requires the field installation of 208, L1: RED + YEL H1 + H3 a general-purpose 125-volt 15-A circuit powered from a source L2: BLU + GRA H2 + H4...
- Page 17 The 38AU unit requires an external temperature control device. This device can be a thermostat (field-supplied) or a PremierLink controller (available as a field-installed accessory, for use on a Carrier Comfort Network or as a stand alone O/B/Y2 control). (Notes 1) Thermostat —...
- Page 18 External Devices – The 38AU control transformers provide 24- ergize economizer control relay and electric heater contactors v NEC Class 2 power sources to energize external control de- or relays. Maximum available power is 20 va. Check concur- vices. These devices will include the indoor fan motor contac- rent loadings by external control devices.
- Page 19 PRE-START-UP START-UP IMPORTANT: Before beginning Pre-Start-Up or Start-Up, 38AU Units review Start-Up Checklist at the back of this book. The The compressor crankcase heater(s) must be on for 24 hours Checklist assures proper start-up of a unit and provides a before start-up.
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Page 20: Start Unit
Advanced Scroll Temperature Protection (ASTP) Start Unit A label located above the terminal box identifies Copeland Set the space thermostat to a set point above space temperature Scroll compressor models that contain this technology. See Fig. so that there is no demand for cooling. Close the 38 AU discon- 17. - Page 21 Fig. 19 — 38AUZ*07 Charging Chart Fig. 20 — 38AUZ*08 Charging Chart...
- Page 22 Fig. 21 — 38AUD*12 Charging Chart...
- Page 23 Fig. 22 — 38AUD*14 Charging Chart...
- Page 24 Fig. 23 — Typical 38AUZ Wiring Diagram (50Hz Single Circuit Unit Shown)
- Page 25 Fig. 24 — Typical 38AUD Wiring Diagram (50Hz Dual Circuit Unit Shown)
- Page 26 OPERATING SEQUENCE ROUTINE SYSTEM MAINTENANCE These items should be part of a routine maintenance program, Base Unit Controls to be checked every month or two, until a specific schedule for Indoor (Supply) Fan each can be identified for this installation: The indoor fan contactor (IFC) is remotely located at the fan Quarterly Inspection coil or fan section.
- Page 27 SERVICE run-offs, and protect drop cloth from tears caused by tools or components. Refrigeration System 3. Place terry cloth shop towel inside unit immediately un- der component(s) to be serviced and prevent lubricant run-offs through the louvered openings in the base pan. 4.
- Page 28 Comfort Alert Diagnostic Module POWER The Comfort Alert Diagnostic Module (CADM) monitors and (GRN) ® analyzes data from the Copeland Scroll three-phase compres- sor and the thermostat demand. The CADM also provides a 3-minute anti-recycle time delay to compressor cycling. The CADM detects causes for electrical and system related failures without any sensors.
- Page 29 Table 13 — LED Status Codes Status LED Status LED Description Status LED Troubleshooting Information Green “POWER” Module has power Supply voltage is present at module terminals Red “TRIP” Thermostat demand signal Y 1. Compressor protector is open LED On Solid is present, but the 2.
- Page 30 Table 14 — CADM Troubleshooting Miswired Module Indication Recommended Troubleshooting Action Green LED is not on, Determine if both R and C module terminals are module does not power up connected. Verify voltage in present at module’s R and C terminals.
- Page 31 Condenser Fans Service Valves Fig. 27 — Typical Exterior, Single-Circuit Unit (38AUZ*08 shown) Outdoor Coil 32LT Sensor Typical Location High Flow Access Port Fig. 28 — Typical Interior, Single-Circuit Unit (38AUZ*08 shown)
- Page 32 Condenser Fans Service Valves Fig. 29 — Typical Exterior, Two-Circuit Unit (38AUD*14 shown) Outdoor Coil Motormaster Sensor Location High Flow Access Ports Fig. 30 — Typical Interior, Two-Circuit Unit (38AUD*14 shown)
- Page 33 NOVATION™ Coil Cleaning and Maintenance — To clean the NOVATION condenser coil, chemicals are NOT to be used; only water is approved as the cleaning solution. EQUIPMENT DAMAGE HAZARD Only clean potable water is authorized for cleaning Failure to follow this caution may result in damage to NOVATION condensers.
- Page 34 TROUBLESHOOTING PROBLEM SOLUTION COMPRESSOR DOES NOT RUN Contactor Open 1. Power off. 1. Restore power. 2. Fuses blown in field power circuit. 2. After finding cause and correcting, replace with correct size fuse. 3. No control power. 3. Check control transformer primary connections and circuit breaker. 4.
- Page 35 TROUBLESHOOTING (cont) PROBLEM SOLUTION COMPRESSOR RUNNING BUT COOLING INSUFFICIENT Suction Pressure Low 1. Refrigerant charge low. 1. Add refrigerant. 2. Head pressure low. 2. Check refrigerant charge. Check outdoor-air fan thermostat settings. 3. Air filters dirty. 3. Clean or replace filters. 4.
- Page 36 APPENDIX A • Do not install a suction-line filter drier in liquid-line. • POE oils absorb moisture rapidly. Do not expose oil to AIR CONDITIONER AND HEAT PUMP WITH atmosphere. — ® PURON QUICK REFERENCE GUIDE • POE oils may cause damage to certain plastics and roofing materials.
- Page 37 APPENDIX C MOTORMASTER SENSOR LOCATIONS Sensor Sensor 508 mm (20 in) 254 mm (10 in) Fig. 32 — 38AUZ*07-08 Motormaster Sensor Locations Fig. 33 — 38AUD*12-14 Motormaster Sensor Locations...
- Page 38 Catalog No: 38AU-C01SI Copyright 2009 Carrier Corp • 7310 W. Morris St. • Indianapolis, IN 46231 Printed in U.S.A. Edition Date:12/09 Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. Replaces: New...
- Page 39 III. START UP START-UP CHECKLIST I. PRELIMINARY INFORMATION OUTDOOR: MODEL NO. SERIAL NO. INDOOR: AIR HANDLER MANUFACTURER MODEL NO. SERIAL NO. ADDITIONAL ACCESSORIES II. PRE-START-UP OUTDOOR UNIT IS THERE ANY SHIPPING DAMAGE? (Y/N) IF SO, WHERE: WILL THIS DAMAGE PREVENT UNIT START-UP? (Y/N) CHECK POWER SUPPLY.
- Page 40 COMPRESSOR AMPS (L1/L2/L3) (A/B) NOTES: Catalog No: 38AU-C01SI Copyright 2009 Carrier Corp • 7310 W. Morris St. • Indianapolis, IN 46231 Printed in U.S.A. Edition Date: 12/09 Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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Page 41: Table Of Contents
38AUD Air Cooled Condensing Units 50 Hz With Puron (R---410A) Refrigerant Sizes 16---25 Installation, Start---Up and Service Instructions CONTENTS Compressor Oil ......SAFETY CONSIDERATIONS . -
Page 42: Safety Considerations
SAFETY CONSIDERATIONS WARNING Improper installation, adjustment, alteration, service, PERSONAL INJURY AND ENVIRONMENTAL maintenance, or use can cause explosion, fire, electrical HAZARD shock or other conditions which may cause personal Failure to follow this warning could cause in personal injury or property damage. Consult a qualified installer, injury or death. - Page 43 Installation – CAUTION 1. Remove the existing evaporator coil or fan coil and install the replacement coil when appropriate. UNIT DAMAGE HAZARD 2. Drain oil from low points and traps in suction line Failure to follow this caution may result in equipment tubing (and hot gas bypass tubing if appropriate) and damage or improper operation.
- Page 44 C10066 Standard Corner Corner Corner Corner Unit UNIT Center of Gravity Weight Height lbs. lbs. lbs. lbs. lbs. 946.1 mm 590.5 mm 383.3 mm 1279.2 mm 38AUD*25 26.5 37.25 in 23.25 in 15.10 in 50.36 in Fig. 2 - - 38AUD*25 Unit Dimensions...
- Page 45 Table 1A — Physical Data — 38AUD*16-25 Units — 50 Hz SI UNIT SIZE 38AU D*16 D*25 NOMINAL CAPACITY (kW) 52.7 70.3 OPERATING WEIGHT (kg) NOVATION™ Coil (Al Tube) Round Tube/Plate Fin Coil (Cu/Al) ‡ REFRIGERANT TYPE R-410A † Operating Charge A/B, Typical (kg) 6.4/6.4 9.5/9.5 Shipping Charge A/B (kg)
- Page 46 Table 1B — Physical Data — 38AUD*16-25 Units — 50 Hz English UNIT SIZE 38AU D*16 D*25 NOMINAL CAPACITY (tons) OPERATING WEIGHTS (lb) NOVATION™ Coil (Al Tube) Round Tube/Plate Fin Coil (Cu/Al) ‡ REFRIGERANT TYPE R-410A † Operating Charge A/B, Typical (lb) 14.0/14.0 21.0/21.0 Shipping Charge A/B (lb)
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Page 47: Installation
3 8 A U D A 2 5 A 0 G 9 A 0 A 0 A 0 _____________ ____ Model Type Packaging 38AU= Carrier Condensing Unit 0 = Standard Puronr R--- 410A Refrigerant 1 = LTL Type of Coil... -
Page 48: Step 1 - Plan For Unit Location
Step 1 — Plan for Unit Location S Allow sufficient space for airflow clearance, wiring, refrigerant piping, and servicing unit. See Fig. 1 and Select a location for the unit and its support system (pad, Fig. 2 for unit dimensions and weight distribution data. rails or other) that provides for the minimum clearances required for safety. -
Page 49: Step 5 - Complete Refrigerant Piping Connections
Table 3 – Equivalent Lengths for Common Fittings (ft) types. Also identify adjustments for refrigeration specialties. Refer to Part 3 of the Carrier System Design Elbows Nominal Manual for additional data and information on equivalent Tube OD 90° Std 90° Lrad 90°... - Page 50 NOTE: For applications with equivalent length greater than 57 m (188 ft) and/or linear length greater than 38 m (125 ft), contact your local Carrier representative. Table 5 – Hot Gas Bypass — Hot gas bypass, if used, should be 38AUD Maximum Suction Pipe Size introduced before the evaporator.
- Page 51 Generally only one hot gas bypass system will be applied on a two-circuit unit. Connect the hot gas bypass system to Circuit 1 (first-on/last-off, connected to the evaporator coil’s bottom circuit). 38AUD PIPING CONNECTIONS – The 38AUD’s two circuits are designated Circuit 1 and Circuit 2. Circuit 1 is controlled by the thermostat’s Y1 (or TC1) contact and will be the first circuit on and last circuit off.
- Page 52 Table 7 – Refrigerant Specialties Part Numbers. LIQUID LINE LIQUID LINE LLSV SIGHT FILTER SIZE (in.) SOLENOID VALVE (LLSV) COIL GLASS DRIER EF680033 EF680037 KM680008 KH43LG091 EF680035 EF680037 KM680004 KH43LG085 EF680036 EF680037 KM680005 KH43LG087 38AUD units require TWO sets of parts. Select the filter driers for maximum unit capacity and The stub tube connections include -in SAE service...
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Page 53: Step 6 - Install Accessories
(pigtails) on the field line connection points on For linear line lengths longer than 38 m (125 ft), contact your local Carrier representative for system charge value. contactor C or optional disconnect switch. These leads are for factory run- - test purposes only; remove and discard Step 6 —... - Page 54 The 38AUD unit requires an external temperature control device. This device can be a thermostat (field-supplied) or a PremierLink controller (available as a field-installed accessory, for use on a Carrier Comfort Network or as a stand alone control).
- Page 55 C10078 Fig. 12 - - Typical Remote Thermostat Connections Thermostat — Install a Carrier-approved accessory thermostat according to installation instructions included with the accessory. Locate the thermostat accessory on a solid wall in the conditioned space to sense average temperature in accordance with the thermostat installation instructions.
- Page 56 Table 8 – Electrical Data — 38AUD*16- - 25 50 Hz Units VOLTAGE COMPRESSOR 1 COMPRESSOR 2 OFM (ea) FUSE RANGE‡ UNIT V-Ph-Hz SIZE SIZE WATTS 38AUD*16 400--- 3--- 50 12.2 12.2 29.6 38AUD*25 400--- 3--- 50 16.7 16.7 40.4 Legend and Notes for Table 8 LEGEND: Example: Supply voltage is 230-3-60...
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Page 57: Pre-Start-Up
PRE-START-UP CAUTION IMPORTANT: Before beginning Pre-Start-Up or UNIT DAMAGE HAZARD Start-Up, review Start-Up Checklist at the back of Failure to follow this caution may result in equipment this book. The Checklist assures proper start-up of a damage. unit and provides a record of unit condition, Prior to starting compressor, a preliminary charge of application requirements, system information, and refrigerant... - Page 58 ADJUST REFRIGERANT CHARGE — Refer to Cooling Charging Charts, Fig. 16 and Fig. 17. For applications with line lengths greater than 38m (125 ft), contact Carrier representative. Vary refrigerant until the conditions of the chart are met. Note that the charging charts are different from the type normally used.
- Page 59 38AUD-16 Charging Chart Puron Circuit 1 All Condenser Fans Operating 150.00 130.00 110.00 90.00 70.00 50.00 30.00 140.00 190.00 240.00 290.00 340.00 390.00 440.00 490.00 540.00 590.00 640.00 Pressure at Liquid Valve (psig) 38AUD-16 Charging Chart Puron Circuit 2 All Condenser Fans Operating 150.00 130.00 110.00...
- Page 60 38AUD-25 Charging Chart Puron Circuit 1 4 Condenser Fans Operating 120.00 110.00 100.00 90.00 80.00 70.00 60.00 50.00 40.00 30.00 140.00 190.00 240.00 290.00 340.00 390.00 440.00 490.00 Pressure at Liquid Valve (psig) 38AUD-25 Charging Chart Puron Circuit 2 4 Condenser Fans Operating 120.00 110.00 100.00...
- Page 61 C10084 Fig. 18 - - Typical 38AUD*16 Wiring Diagram...
- Page 62 C10085 Fig. 19 - - Typical 38AUD*25 Wiring Diagram...
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Page 63: Operating Sequence
OPERATING SEQUENCE As space cooling load is satisfied, thermostat outputs Y2 and Y1 are de- - energized, removing 24-v at 38AUD Base Unit Controls terminals Y2 and Y1. Circuit 2 compressor stops on Y2 opening; SVR2 is de-energized and LLSV2 closes. Indoor (Supply) Fan CADM2 begins its three-minute anti-recycle time delay. -
Page 64: Routine System Maintenance
ROUTINE SYSTEM MAINTENANCE SERVICE Refrigeration System These items should be part of a routine maintenance program, to be checked every month or two, until a CAUTION specific schedule for each can be identified for this installation: Quarterly Inspection EQUIPMENT DAMAGE HAZARD and 30 days after initial start) Failure to follow this caution may result in damage to equipment. -
Page 65: Liquid Line Filter Drier
Liquid Line Filter Drier — The factory-provided filter provides a 3-minute anti-recycle time delay to compressor drier is specifically designed to operate with Puron®. cycling. Replace the filter drier with factory-authorized components The CADM detects causes for electrical and system only with a filter drier with desiccant made from 100% related failures without any sensors. - Page 66 The TRIP LED indicates either a time-delay period is POWER (GRN) currently active (RED LED is blinking) or the module has locked out the compressor (RED LED is on steady). A lockout condition will occur when the CADM detects a thermostat demand at input Y but there is no power at the compressor line terminals T1 or T2 or T3.
- Page 67 Table 9 – LED Status Codes Status LED Status LED Description Status LED Troubleshooting Information Green “POWER” Module has power Supply voltage is present at module terminals Compressor protector is open Red “TRIP” Thermostat demand signal LED On Solid Y is present, but the com- Condensing unit power disconnect is open pressor is not running.
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Page 68: Crankcase Heater
Table 10 – CADM Troubleshooting Miswired Module Indication Recommended Troubleshooting Action Green LED is not on, Determine if both R and C module terminals are connected. module does not power up Verify voltage in present at module’s R and C terminals. NOTE: The CADM requires a constant nominal 24VAC power supply. - Page 69 Condenser Fans/Motors Access Panel - Control Box & Compressors Service Valves C10087 Fig. 22 - - 38AUD Size 16 Cabinet C10095 Fig. 23 - - 38AUD*16 Piping...
- Page 70 Condenser Fans/Motors Access Panel - Control Box & Compressors Service Valves C10089 Fig. 24 - - 38AUD Size 25 Cabinet C10090 Fig. 25 - - 38AUD*25 Piping...
- Page 71 C10088 Fig. 26 - - 38AUD*16 Compressor Assembly (Rear View) C10091 Fig. 27 - - 38AUD*25 Compressor Assembly (Rear View)
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Page 72: Novationtcoil Cleaning And Maintenance
RTPF coils. This cleaner is available from Carrier Replacement parts division as part number P902-0301 for a one gallon container, and part number P902-0305 for a 5 gallon container. It is... -
Page 73: Fastener Torque Values
Totaline Environmentally Sound Coil Cleaner soft non-metallic bristle brush may be used. In either Application Equipment case, the tool should be applied in the direction of the fins. Coil surfaces can be easily damaged (fin edges gallon garden sprayer can be easily bent over and damage to the coating of S water rinse with low velocity spray nozzle a protected coil) if the tool is applied across the fins. - Page 74 TROUBLESHOOTING PROBLEM SOLUTION COMPRESSOR DOES NOT RUN Contactor Open 1. Power off. 1. Restore power. 2. Fuses blown in field power circuit. 2. After finding cause and correcting, replace with correct size fuse. 3. No control power. 3. Check control transformer primary connections and circuit breaker. 4.
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Page 75: Troubleshooting
TROUBLESHOOTING (cont) PROBLEM SOLUTION COMPRESSOR RUNNING BUT COOLING INSUFFICIENT Suction Pressure Low 1. Refrigerant charge low. 1. Add refrigerant. 2. Head pressure low. 2. Check refrigerant charge. Check outdoor-air fan thermostat settings. 3. Air filters dirty. 3. Clean or replace filters. 4. -
Page 76: Air Conditioner & Heat Pump With Puron R
APPENDIX A S POE oils absorb moisture rapidly. Do not expose oil to AIR CONDITIONER & HEAT PUMP WITH atmosphere. ® PURON — QUICK REFERENCE GUIDE S POE oils may cause damage to certain plastics and ® S Puron (R-410A) refrigerant operates at 50 percent to roofing materials. -
Page 77: Motormaster Sensor Locations
APPENDIX C MOTORMASTER SENSOR LOCATIONS Motormaster Sensor Must be positioned on Vapor Stub Motormaster Sensor 254 mm (10 in) C10093 C10094 Fig. 29 - - Motormaster Sensor Location: Fig. 30 - - Motormaster Sensor Location: 38AUD*16 38AUD*25... - Page 78 Catalog No: 38AU ---C02SI Copyright 2010 Carrier Corp. D 7310 W. Morris St. D Indianapolis, IN 46231 Printed in U.S.A. Edition Date: 01/10 Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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Page 79: Start-Up Checklist
START-UP CHECKLIST I. PRELIMINARY INFORMATION OUTDOOR: MODEL NO. SERIAL NO. INDOOR: AIRHANDLER MANUFACTURER MODEL NO. SERIAL NO. ADDITIONAL ACCESSORIES II. PRE-START-UP OUTDOOR UNIT IS THERE ANY SHIPPING DAMAGE? (Y/N) IF SO, WHERE: WILL THIS DAMAGE PREVENT UNIT START-UP? (Y/N) CHECK POWER SUPPLY. DOES IT AGREE WITH UNIT? (Y/N) HAS THE GROUND WIRE BEEN CONNECTED? (Y/N) - Page 80 CIRCUIT 2 NOTES: Catalog No: 38AU ---C02SI Copyright 2010 Carrier Corp. D 7310 W. Morris St. D Indianapolis, IN 46231 Printed in U.S.A. Edition Date: 01/10 Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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