installation, start-up and

service instructions

548D

Sizes 090-120

SINGLE PACKAGE ROOFTOP

71/2 to 10 Tons

STANDARD-EFFICIENCY HEAT PUMP UNITS

 

CONTENTS

Page

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . 1

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-27

I. Step 1— Provide Unit Support . . . . . . . . . . . . . . . . . 1

II. Step 2 — Field Fabricate Ductwork . . . . . . . . . . . . . 3

III. Step 3 — Install Condensate Drain Line

and External Trap. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 IV. Step 4 — Rig and Place Unit. . . . . . . . . . . . . . . . . . . 3 V. Step 5 — Make Electrical Connections . . . . . . . . . . 7 VI. Step 6 — Adjust Factory-Installed Options . . . . . . 11 VII. Step 7 — Adjust Indoor-Fan Speed . . . . . . . . . . . . 19

PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28-30

I. Unit Preparation. . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

II. Return-Air Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

III. Outdoor-Air Inlet Screen . . . . . . . . . . . . . . . . . . . . . 28

IV. Compressor Mounting. . . . . . . . . . . . . . . . . . . . . . . 28

V. Internal Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

VI. Refrigerant Service Ports . . . . . . . . . . . . . . . . . . . . 28

VII. High Flow Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

VIII. Compressor Rotation . . . . . . . . . . . . . . . . . . . . . . . 28

IX. Adjust Gas Input . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

X. Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

XI. Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

XII. Safety Relief . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

XIII. Ventilation (Continuous Fan) . . . . . . . . . . . . . . . . . 29

XIV. Operating Sequence . . . . . . . . . . . . . . . . . . . . . . . . 29

SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30-33

I. Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

II. Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

III. Outdoor Fan Adjustment. . . . . . . . . . . . . . . . . . . . . 32

IV. Economizer Adjustment . . . . . . . . . . . . . . . . . . . . . 32

V. Refrigerant Charge . . . . . . . . . . . . . . . . . . . . . . . . . 32

TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . .34-38

START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . . . CL-1

SAFETY CONSIDERATIONS

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

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

Cancels: II 548D-90-1

II 548D-90-2

 

10/15/00

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

WARNING: Before performing service or mainte- nance operations on unit, turn off main power switch to unit and tag disconnect with lockout tag. Electrical shock could cause personal injury.

INSTALLATION

Unit is shipped in the vertical configuration. To convert to horizontal configuration, remove side duct opening covers.

Using the same screws, install covers on vertical duct open- ings with the insulation-side down. Seals around duct open- ings must be tight.

I. STEP 1 — PROVIDE UNIT SUPPORT

A. Roof Curb

Assemble and install accessory roof curb in accordance with instructions shipped with curb. See Fig. 1. Install insulation, cant strips, roofing felt, and counter flashing as shown. Duct- work must be attached to curb. If electric or control power is to be routed through the basepan, attach the accessory thru- the-bottom service connections to the basepan in accordance with the accessory installation instructions. Connections must be installed before unit is set on roof curb.

IMPORTANT: The gasketing of the unit to the roof curb is critical for watertightness. Install gasket supplied with the roof curb as shown in Fig. 1. Improperly applied gasket can also result in air leaks and poor unit performance.

Curb should be level. Unit leveling tolerances are shown in Fig. 2. This is necessary for unit drain to function properly. Refer to Accessory Roof Curb Installation Instructions for additional information as required.

B. Slab Mount (Horizontal Units Only)

Provide a level concrete slab that extends a minimum of 6 in. beyond unit cabinet. Install a 6 in. gravel apron in front of condenser coil air inlet to prevent grass and foliage from obstructing airflow.

NOTE: Horizontal units may be installed on a roof curb if required.

CAUTION: Ensure voltage listed on unit data plate agrees with electrical supply provided for the unit.

Page 1 Page 2
Page 1
Image 1
Bryant 548D installation instructions Contents, Safety Considerations, Installation, Provide Unit Support
Page 1 Page 2

548D specifications

The Bryant 548D heat pump stands out in the HVAC market for its robust performance, energy efficiency, and advanced technology. Known for its reliability, this particular model is designed to provide optimal heating and cooling for both residential and light commercial applications.

One of the standout features of the Bryant 548D is its variable-speed compressor, which allows for precise temperature control and enhances comfort levels in any environment. This technology enables the 548D to operate efficiently at different speeds, adjusting its output based on the heating or cooling demand. As a result, homeowners can enjoy consistent temperature regulation without the wide fluctuations typical of single-stage systems.

In addition to the variable-speed compressor, the Bryant 548D utilizes advanced refrigerant technology. It employs the environmentally friendly Puron refrigerant, which not only improves the unit's efficiency but also reduces its carbon footprint. This makes the 548D a sustainable choice for those looking to minimize their environmental impact while still enjoying superior heating and cooling performance.

Another key characteristic of the Bryant 548D is its impressive energy efficiency rating, often exceeding the minimum requirements set by the Department of Energy. With a high Seasonal Energy Efficiency Ratio (SEER) for cooling in warmer months and an excellent Heating Seasonal Performance Factor (HSPF), the 548D minimizes energy consumption while maximizing comfort.

The 548D also features Quiet Operation technology, ensuring that the system runs quietly in the background without disrupting daily activities. This is particularly beneficial for light commercial spaces or homes where noise can be a concern. The sleek design and compact size make the unit easy to install in various settings without occupying excessive space.

Furthermore, Bryant incorporates advanced smart technology within the 548D model. The system can be integrated with smart thermostats, allowing users to monitor and control their heating and cooling settings remotely. This feature not only enhances convenience but also enables homeowners to program their systems for maximum efficiency.

In conclusion, the Bryant 548D heat pump is an exceptional choice for those seeking a reliable, efficient, and technologically advanced heating and cooling solution. Its combination of variable-speed compression, eco-friendly refrigerant, high energy efficiency, and quiet operation positions it well in the competitive HVAC market, making it a top choice for both residential and light commercial applications. By investing in the Bryant 548D, consumers can enjoy superior comfort and lower energy bills year-round.
Top Page Image Contents