Installation Guide for Bryant 135SAN Air Conditioner

Quick guide from the manual

This installation guide is intended for EPA-qualified personnel only. The Bryant 135SAN air conditioner uses R-454B refrigerant. Before starting, ensure you have read the entire manual. Key safety requirements include using non-sparking tools for A2L refrigerants, having a refrigerant detector present, and ensuring all electrical disconnects are locked out during installation.

Installation and mounting

The unit must be installed on a solid, level mounting pad. For rooftop applications, mount on a level platform above a load-bearing wall to minimize vibration. Ensure the unit is at least 6 inches above the roof surface. Maintain the following clearance requirements for proper airflow and service:

• Service end: 24 inches
• Above unit: 48 inches
• One side: 6 inches
• Remaining sides: 12 inches

Piping connections

Refrigerant tubes must be protected from physical damage and vibration. When passing through walls, seal openings with RTV or pliable caulk. Use factory-supplied liquid-line filter driers. If brazing, wrap service valves with a wet cloth to prevent heat damage and remove valve cores before brazing. The system must be evacuated to 500 microns using a vacuum pump.

Electrical connections

Ensure field wiring complies with local and national codes. The unit requires an uninterrupted ground connection. Control wiring should be 18 AWG color-coded wire (use 16 AWG if the thermostat is over 100 ft away). All wiring must be separated from incoming power leads. For 3-phase units, a factory-installed monitor checks for phase problems; if the LED flashes, interchange two field-wiring leads on the contactor.

System start-up and charging

Follow these steps to start the system:

1. After evacuation, fully open liquid and vapor service valves.
2. Replace stem caps and tighten with a wrench (1/12 turn past finger-tight).
3. Close electrical disconnects to energize the system.
4. Set the thermostat to COOL and fan to ON or AUTO.
5. Operate for 15 minutes before checking the refrigerant charge.

For units with a TXV, use the subcooling method to check or adjust the charge. Ensure outdoor temperatures are between 70°F and 100°F and indoor temperatures are between 70°F and 80°F for accurate readings.