HVAC / Air Conditioners
Installation Guide for Bryant 126S Series Air Conditioner
Professional installation guide for the Bryant 126S Series Air Conditioner. Includes safety warnings, mounting instructions, refrigerant piping, electrical wiring, and system start-up procedures.
Quick answers from the manual
Quick answer
- This manual provides installation, wiring, charging, and start-up instructions for the Bryant 126S Series Air Conditioner. p. 1, 8
Key actions
- Install on a solid, level mounting pad. p. 2
- Connect refrigerant tubing. p. 3
- Evacuate refrigerant tubing and indoor coil. p. 4
- Make electrical connections. p. 7
First start
- Open service valves. p. 8
- Energize system. p. 8
- Set thermostat. p. 8
- Operate and check charge. p. 8
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Problems and fixes
3-Phase Monitor LED flashing
Disconnect power to unit and interchange 2 field-wiring leads on unit contactor.
p. 8
Refrigerant tubing buried
Provide 6-in vertical rise at service valve; do not bury more than 36-in.
p. 2
Improper line voltage
Contact local power company for correction.
p. 7Error codes
| Code | Meaning | Action | Pages |
|---|---|---|---|
| FLASHING (3-Phase Monitor LED) | Reversed phase | Disconnect power to unit and interchange 2 field-wiring leads on unit contactor. | p. 8 |
Maintenance and reset
- Check flexible pipe elements for mechanical damage annually. p. 1
- Perform periodic maintenance. p. 11
Technical specifications
| Parameter | Value | Meaning | Pages |
|---|---|---|---|
| Maximum installation altitude | 10,000 feet (3000 meters) | Maximum altitude above sea level for installation. | p. 1 |
| Maximum liquid-line size | 3/8-in. OD | Maximum size for all residential applications. | p. 2 |
| Minimum outdoor operating ambient (cooling) | 55°F (13°C) | Minimum temperature for cooling mode without accessory. | p. 2 |
| Deep vacuum requirement | 500 microns | Required vacuum level for evacuation. | p. 4 |
| Pressure proof check | 200 psi | Nitrogen charge for pressure check. | p. 4 |
| Control power | 24v/40va minimum | Transformer requirement. | p. 7 |
| Control wire gauge (standard) | No. 18 AWG | Standard control wiring. | p. 7 |
| Control wire gauge (long run >100ft) | No. 16 AWG | Control wiring for runs over 100 ft. | p. 7 |
Where to find it in the PDF
- Safety Considerations p. 1
- Installation Steps p. 2, 3, 4
- Charging Procedures p. 5, 6, 9
- Electrical Connections p. 7, 8
- Accessory Usage p. 10
Table of contents
Quick guide from the manual
This document provides installation instructions for the Bryant 126S Series Air Conditioner. Installation must be performed by EPA-qualified personnel. Key requirements include proper mounting on a level surface, adherence to clearance specifications for airflow, correct refrigerant piping and evacuation, and precise electrical wiring. The system requires specific charging methods based on the metering device (TXV or Piston).
Safety Considerations
Improper installation can lead to fire, electrical shock, or explosion. Always follow local building codes and the National Electrical Code (NEC). Wear appropriate protective gear, including safety glasses and gloves. Ensure the main electrical disconnect is in the OFF position before servicing.
Installation Requirements
The unit must be installed on a level, load-bearing surface. For rooftop applications, use a level platform or frame. Maintain the following clearances for proper airflow and service:
- Service end: 24 inches (609.6 mm)
- Above unit: 48 inches (1219.2 mm)
- Sides: 6 inches (152.4 mm) on one side, 12 inches (304.8 mm) on remaining sides
- Between units: 24 inches (609.6 mm)
Refrigerant Piping
Use refrigerant-grade tubing. The maximum liquid-line size is 3/8-inch OD. A factory-supplied liquid-line filter drier must be installed. After connecting, the system must be evacuated to 500 microns using a vacuum pump. Do not use the system compressor as a vacuum pump.
Electrical Connections
Ensure field wiring complies with local and national codes. Use copper wire only between the disconnect switch and the unit. Connect the ground wire to the control box. For 3-phase units, a factory-installed monitor checks for phase problems; if the LED flashes, disconnect power and interchange two field-wiring leads on the contactor.
System Start-Up and Charging
Charging methods depend on the indoor unit configuration:
- Units with TXV: Use the subcooling method. Measure liquid service valve pressure and liquid line temperature, then refer to the rating plate for required subcooling.
- Units with Indoor Piston: Use the superheat method. Measure suction pressure and temperature, outdoor dry-bulb temperature, and indoor wet-bulb temperature. Refer to the provided superheat charging tables.
Operate the unit for at least 15 minutes before checking the charge.
Final Checks
Before leaving the job site, ensure all wiring is routed away from tubing and sheet metal edges to prevent damage. Securely fasten all panels and covers. Tighten service valve stem caps to 1/12-turn past finger tight. Provide the owner with the manual and explain periodic maintenance requirements.
Practical help
Common problems
3-Phase monitor LED flashing
Indicates reversed phase. Disconnect power and interchange 2 field-wiring leads on the unit contactor.
Noise in living area
Often caused by gas pulsations from improper installation. Ensure tubing is not in direct contact with structure.
System not cooling properly
Check refrigerant charge using the appropriate method (subcooling for TXV, superheat for piston) and verify airflow clearances.
Before use
- Verify unit is installed on a level, load-bearing surface.
- Ensure all refrigerant tubing is properly insulated and secured.
- Confirm electrical supply matches unit rating plate.
- Check that all service valves are open.
- Verify thermostat is set to COOL and fan to AUTO.
- Ensure filter drier is installed in the liquid line.
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Specs in practice
- Subcooling Method
- Charging procedure for units with TXV; requires measuring liquid line pressure and temperature.
- Superheat Method
- Charging procedure for units with indoor piston; requires measuring suction pressure and temperature.
- Deep Vacuum Method
- Required evacuation process to 500 microns to ensure a dry, tight system.
Model compatibility
- Compatible with factory-approved indoor units.
- Requires EPA qualified personnel for installation.
- 3-phase scroll compressors are rotation sensitive.
Manual page author
Emily Carter
User documentation editor