551B 036-072

551C 024-060

SINGLE-PACKAGE ROOFTOP ELECTRIC COOLING UNITS WITH OPTIONAL ELECTRIC HEAT

Installation Instructions

TABLE OF CONTENTS

Page SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . 1 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Step 1-Provide Unit Support . . . . . . . . . . . . . . . . . . . . . . 2 ROOF CURB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 SLAB MOUNT (Horizontal Units Only) . . . . . . . . . . . 2 ALTERNATE UNIT SUPPORT . . . . . . . . . . . . . . . . . 2 Step 2-Field Fabricate Ductwork . . . . . . . . . . . . . . . . . . . 2 Step 3-Install External Trap for Condensate Drain . . . . . . . 2 Step 4-Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . . . . . 2 POSITIONING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Step 5 — Make Electrical Connections . . . . . . . . . . . . . . . . 8 FIELD POWER SUPPLY . . . . . . . . . . . . . . . . . . . . . . 8 FIELD CONTROL WIRING . . . . . . . . . . . . . . . . . . . . 8 HEAT ANTICIPATOR SETTINGS . . . . . . . . . . . . . . . 8 Step 6 — Adjust Factory-Installed Options . . . . . . . . . . . 22

PERFECT HUMIDITYADAPTIVE DEHUMIDIFICATION SYSTEM . . . . . . . . . . . . . . 22

DISCONNECT SWITCH . . . . . . . . . . . . . . . . . . . . . 22 MANUAL OUTDOOR-AIR DAMPER . . . . . . . . . . 22 CONVENIENCE OUTLET . . . . . . . . . . . . . . . . . . . 22 OPTIONAL ECONOMI$ER IV . . . . . . . . . . . . . . . . 24 ECONOMI$ER IV STANDARD SENSORS . . . . . . 25 ECONOMI$ER IV CONTROL MODES . . . . . . . . . 26

Step 7 — Adjust Evaporator-Fan Speed . . . . . . . . . . . . . . 31 PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment can be hazardous due to system pressure and electrical components. Only trained and qualified service personnel should install, repair, or service air-conditioning equipment.

Untrained personnel can perform basic maintenance functions of cleaning coils and filters and replacing filters. All other operations should be performed by trained service personnel. When working on air-conditioning equipment, observe precautions in the literature, tags and labels attached to the unit, and other safety precautions that may apply.

Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloth for unbrazing operations. Have fire extinguishers available for all brazing operations.

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, and CAUTION. 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 a hazard 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.

!WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could cause personal injury or death.

Before performing service or maintenance operations on unit, turn off main power switch to unit and install lockout tag. Ensure electrical service to rooftop unit agrees with voltage and amperage listed on the unit rating plate.

INSTALLATION

Unit is shipped in the vertical discharge configuration. To convert to horizontal discharge application, remove duct opening covers. Using the same screws, install covers on duct openings in basepan of unit with insulation-side down. Seals around openings must be tight. (See Fig. 1.)

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Bryant 551C, 551B installation instructions Installation Instructions

551C, 551B specifications

The Bryant 551B and 551C are two highly efficient air conditioning units designed to provide optimal comfort in residential settings. Known for their reliability and performance, these models are part of Bryant's esteemed line of heating and cooling solutions.

One of the standout features of the Bryant 551B is its two-stage cooling system, which allows for better humidity control and increased comfort. This ensures that homeowners can enjoy consistent temperatures while reducing energy consumption. The unit operates quietly, thanks to its noise-reducing technology, making it an ideal choice for bedrooms and living spaces.

On the other hand, the Bryant 551C builds upon this foundation with its variable-speed compressor. This technology allows the unit to adjust its cooling output according to the specific needs of the home. This results in seamless operation and even greater energy efficiency. Both models also incorporate Bryant's advanced control capabilities, which allow users to monitor and adjust settings remotely via smart devices, adding a layer of convenience and modernity to home climate control.

With an emphasis on durability, both the 551B and 551C feature a galvanized steel cabinet that protects against weather-related damage. The powder coat finish further enhances their resistance to rust and corrosion, ensuring a long lifespan and minimal maintenance.

Another significant characteristic of these units is their excellent Seasonal Energy Efficiency Ratio (SEER) ratings. The 551B boasts a SEER rating of up to 16, while the 551C takes it even further with ratings exceeding 20. This efficiency not only translates to lower energy bills for homeowners but also contributes to a reduced carbon footprint, making these units environmentally friendly options.

Both models are also designed to operate with eco-friendly refrigerants, aligning with modern energy standards and regulations aimed at reducing greenhouse gas emissions.

In summary, the Bryant 551B and 551C are exemplary choices for homeowners looking for reliable, efficient, and high-performing air conditioning solutions. With features such as two-stage and variable-speed compressors, advanced smart technology, and robust construction, these models stand out in the competitive HVAC market. They promise a comfortable indoor environment along with significant energy savings, making them a wise investment for the future.