Carrier 38AH044-084 Install Accessories, System Check, Main Power Connection Control Circuit

Page 37

Table 15 Ð Main Power Connection and Control Circuit Wiring

 

MAIN POWER CONNECTION

 

CONTROL CIRCUIT

Electrical

Qty

Qty

Max Wire

Control Power

Safety Circuit

Characteristics

Terminal

Parallel

Size

(V)

(V)

(V-Ph-Hz)

Blocks

Conductors*

(kcmil)

 

 

208/230-3-60

1

6

500

115²

24

460-3-60

1

3

500

115²

24

575-3-60

 

 

 

 

 

230-3-50

1

6

500

230

24

380-3-60

1

3

500

230

24

380/415-3-50

 

 

 

 

 

346-3-50

1

3

500

200

24

LEGEND

kcmil Ð Thousand Circular Mils

*Conductors are from the safety disconnect.

²Control power is accomplished with a step-down transformer where primary voltage is ®eld voltage.

Step 5 Ð Install Accessories

LOW-AMBIENT OPERATION

Units 38AH044-084, 124, and 134 Ð If operating tempera- tures below 55 F (13 C) are expected, Motormaster III fan motor control is recommended. Refer to separate installa- tion instructions for low-ambient operation guidelines.

Units 38AH094 and 104 Ð If operating temperatures below 45 F (7 C) are expected, Motormaster III fan motor control is recommended. Refer to separate installation instructions for low-ambient operation guidelines.

MISCELLANEOUS ACCESSORIES Ð For applications requiring special accessories, the following packages are available: condenser coil hail guard package, gage panel, unloader package, unloader conversion kits, sound reduc- tion package, condenser coil protective grilles, compressor security grilles, ModuPanel™ control, and thermostat trans- former relay package.

PRE-START-UP

IMPORTANT: Before beginning Pre-Start-Up or Start- Up, review Start-Up Checklist at the back of this pub- lication. The Checklist assures proper start-up of a unit and provides a record of unit condition, application re- quirements, system information, and operation at ini- tial start-up.

Do not attempt to start the air-conditioning system until following checks have been completed.

System Check

1.Check all system components, including the air- handling equipment. Consult manufacturer's instruc- tions. If the unit has ®eld-installed accessories, be sure all are properly installed and wired correctly. Refer to unit wiring diagrams.

2.Backseat (open) compressor suction and discharge shut- off valves. Close valves one turn to allow refrigerant pres- sure to reach the test gages.

3.Open liquid line service valves.

4.Check tightness of all electrical connections.

5.Oil should be visible in the compressor sight glasses. See Fig. 29. An acceptable oil level in the compressor is from 1¤8 to 1¤3 of sight glass. Adjust the oil level as required. No oil should be removed unless the crank- case heater has been energized for at least 24 hours. See Preliminary Oil Charge section on page 38, for Carrier- approved oils.

6.Electrical power source must agree with unit nameplate.

Crankcase heaters on all units are wired into the control circuit, so they are always operable as long as the main power supply disconnect is on (closed), even if any safety device is open. Compressor heat- ers must be on for 24 hours prior to the start-up of any compressor.

7.Crankcase heaters must be ®rmly locked into compres- sors, and must be on for 24 hours prior to start-up.

8.Fan motors are 3-phase. Check rotation of fans during ®rst start-up check. Fan rotation is clockwise as viewed from top of unit. If fan is not turning clockwise, reverse 2 of the power wires.

9.Check compressor suspension. On units 38AH044-084, 124, and 134, snubber washers (for noise suppression) can be moved with ®nger pressure. On units 38AH094 and 104, rails allow compressors to ¯oat freely on com- pressor rail springs.

10.On 38AH074,084 single-circuit units and Module 38AH134B, ensure that the packaging block located be- tween the oil equalization tube and the compressor cross- brace has been removed.

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Contents Installation, Start-Up Service Instructions Unit Rigging Center of Gravity Ð in. mmModule Weight Unit Total Operational Corner WeightCheck Compressor Mounting Dimensions Ð Units 38AH044,054,064 Dimensions Ð Units 38AH074,084 Chart 1, Field Power Supply Connections Dimensions Ð Unit 38AH094Dimensions Ð Unit 38AH104 Dimensions Ð Unit 38AH124 Dimensions Ð Unit 38AH134 Ð Units 38AH044-084 Physical Data Ð 50/60 Hz SI Ð Units 38AH044-084 Physical Data Ð 50/60 Hz EnglishÐ Units 38AH094-134 Physical Data Ð 50/60 Hz SI Ð Units 38AH094-134 Physical Data Ð 50/60 Hz EnglishControl BOX Sheet Metal Cover Panel Removed Ð Typical Module with Cover Panels Removed Liquid Lift Make Refrigerant Piping ConnectionsUnit Maximum Liquid Lift Pipe D Diameter Unit STR Ð StreetDual Circuit Single Circuit 38AH 044 Total Linear Length of Interconnecting Pipe Ð FT M Unit 15¤8 21¤8 124B,134A 074 Total Linear Length of Interconnecting Pipe Ð FT Unit15-20 20-50 50-75 124B, 134A 07438AH 6.1 TXV Ð Thermostatic Expansion Valve TYP Ð Typical Units 38AH124 and 134 with Installed Piping Kit Fully Assembled Piping and Trim Kit Unit 38AH134 Shown Kit RailsÐ Electrical Data Ð 50/60 Hz 38AH044-084 Dual-Circuit Units Make Electrical ConnectionsFLA Optional SINGLE-CIRCUIT Unit CompressorRLA Unit Voltage Nameplate Supply COMPRESSOR² MCA Electrical Data Ð 50/60 Hz Units 38AH094,104Designation CKT ModelControl Circuit Electrical Data Ð 50/60 Hz Electrical Data Ð 50/60 Hz Units 38AH124Unit Condenser FAN Fan Motor Electrical Data38AH Nameplate Qty Total No.* FLA Each No.* LRA Each Unit 38AH ModuleLength Ð Insulated Wire Ð AWG Length Ð Insulated Wire Ð AWG Field Wiring, One 2-Stage Thermostat Ð Units 38AH094 Field Wiring, One 2-Stage Thermostat Ð Units 38AH124 GND Terminal Block for Field Wiring, Single ModuPanel Control, Unit 38AH094 Field Wiring, Single ModuPanel Control, Unit 38AH104 Field Wiring, Single ModuPanel Control, Units 38AH124 Main Power Connection and Control Circuit Wiring Install AccessoriesMain Power Connection Control Circuit Control Power06E Compressors, Typical Preliminary ChecksAdjust Refrigerant Charge 044-084 094 104 124 134 38AH Index of Lead/Lag Circuits and CompressorsSTD OPT Lead Circuit Compressor, Lead Compressor LagCharging Chart Ð Unit 38AH044 50/60 Hz Ð Dual Circuit Charging Chart Ð Unit 38AH064 50/60 Hz Ð Dual Circuit Page Page Charging Chart Ð Unit 38AH104 50/60 Hz Charging Chart Ð Unit 38AH094 50/60 HzRefrigerant Circuit Control by Pressure ± 10 Switch Opens 160 Switch Closes 255Fan Cycling Control Ð Psig kPag Switch Cutout CUT-IN Pressure Switch Settings Psig kPagCapacity Control CUT-IN Ð Cutout Ð38AH Circuit Total Quantity of Loaded System Unit Compressor CylindersUnit Quantity System Capacity Loaded CylindersControl Timer Cycle Unit Control Box Compressor OIL Required Compressor Replacement Ð Perform the following06E-250 06E-265 06E-275 06E-299 Compressor Stops on HIGH-PRESSURE Switch Problem Solution Compressor does not RUNCompressor Cycles on LOW-PRESSURE Switch Troubleshooting Pre-Start-Up Preliminary InformationComp A1 Comp A2 Comp B1 Comp B2 Start-Up

38AH044-084 specifications

The Carrier 38AH044-084 is an innovative air conditioning unit designed to provide efficient cooling solutions for residential and light commercial applications. This model is a part of Carrier's Aqua Series and is well-regarded for its combination of performance, energy efficiency, and innovative features.

One of the standout characteristics of the Carrier 38AH044-084 is its high-efficiency rating, which often exceeds the minimum efficiency standards set by the Department of Energy. Its Seasonal Energy Efficiency Ratio (SEER) rating is commendable, indicating significant energy savings over traditional air conditioning units. This efficiency translates to lower utility bills and a reduced carbon footprint, making it an environmentally friendly option.

In terms of technology, the Carrier 38AH044-084 is equipped with a modern scroll compressor. This type of compressor is known for its durability and quiet operation, contributing to a more pleasant indoor environment. The unit also incorporates advanced refrigerant technology, often using R-410A refrigerant, which is recognized for its lower environmental impact compared to older refrigerants like R-22.

The design of the 38AH044-084 focuses on ease of installation and maintenance. The compact footprint makes it suitable for various installation scenarios, whether on rooftops or ground levels. Additionally, the unit is engineered for durability, featuring weather-resistant components that can withstand harsh environmental conditions.

Another notable feature is the advanced airflow system, which ensures even distribution of cooled air throughout the space. This technology minimizes hot spots and enhances overall comfort. Furthermore, the unit supports a range of thermostatic controls, allowing users to customize their cooling experience according to their specific needs.

The Carrier 38AH044-084 is also designed with noise reduction in mind. Its sound-dampening technology helps minimize operational noise, making it a suitable choice for residential areas where noise levels are a concern.

In summary, the Carrier 38AH044-084 offers an excellent combination of energy efficiency, advanced technology, and user-friendly features. Whether for a home or a light commercial space, this unit provides reliable cooling performance while maintaining a focus on environmental responsibility and occupant comfort. With its robust design and innovative capabilities, it's a solid choice for those seeking effective and efficient air conditioning solutions.
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