Bryant 548D installation instructions Contents, Safety Considerations, Installation

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.