Bryant 548D - Manual

Bryant 548D

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Table of Contents:

  • Page 2 – Fig. 1 — Roof Curb Details
  • Page 3 – MAXIMUM ALLOWABLE; DRAIN PLUG; Drain plug is shown in factory-installed position.
  • Page 4 – Fig. 5 — Rigging Details
  • Page 6 – Table 1 — Physical Data
  • Page 7 – When installing units, provide a disconnect per the NEC.; LEGEND; Contactor; COMP —; Compressor; IFC; Indoor Fan Contactor; NEC; National Electrical Code; TB; Fig. 7 — Power Wiring Connections
  • Page 10 – LEGEND AND NOTES FOR TABLES 2A AND 2B
  • Page 11 – Adjustable Heat Anticipator; CC; Fig. 9 — Typical Field Control Wiring Raceway
  • Page 14 – HOOD; Given —
  • Page 15 – CONTROLLER; Fig. 23 — Typical Access Panel Locations
  • Page 18 – Fig. 33 — Supply Air Sensor Mounting Location; OR; Fig. 32 — Wiring Diagram for Power Exhaust System
  • Page 19 – ST; Fig. 35 — Barometric Relief Capacity
  • Page 20 – Mounting for Size 120
  • Page 22 – Table 8 — Fan Performance 548D090 — Vertical Discharge Units
  • Page 23 – Table 9 — Fan Performance 548D102 — Vertical Discharge Units
  • Page 24 – Table 10 — Fan Performance 548D120 — Vertical Discharge Units
  • Page 25 – Table 11 — Fan Performance 548D090 — Horizontal Discharge Units
  • Page 26 – Table 12 — Fan Performance 548D102 — Horizontal Discharge Units
  • Page 27 – Table 13 — Fan Performance 548D120 — Horizontal Discharge Units
  • Page 29 – When the compressor is rotating in the wrong direc-; To Shut Off Unit; To start unit, turn on main power supply.; To Shut Unit Off
  • Page 30 – SERVICE
  • Page 31 – B. Fan Motor Bearings
  • Page 34 – TROUBLESHOOTING; Refer to Tables 14-16 and Fig. 46 for troubleshooting information.; Table 14 — Heating and Cooling Troubleshooting; PROBLEM
  • Page 35 – Table 15 — Durablade Economizer Troubleshooting
  • Page 36 – Table 16 — EconoMi$er Troubleshooting
  • Page 37 – Fig. 46 — Typical Wiring Diagram
  • Page 40 – CUT A; I. PRELIMINARY INFORMATION
Loading the manual

Cancels: II 548D-90-1

II 548D-90-2

10/15/00

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.

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.

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.

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.

CAUTION:

Ensure voltage listed on unit data

plate agrees with electrical supply provided for the
unit.

installation, start-up and
service instructions

SINGLE PACKAGE ROOFTOP
STANDARD-EFFICIENCY HEAT PUMP UNITS

548D

Sizes 090-120

7

1

/

2

to 10 Tons

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Summary

Page 2 - Fig. 1 — Roof Curb Details

— 2 — Fig. 1 — Roof Curb Details PLACE UNIT AS CLOSE TO THIS END OF CURB AS POSSIBLE ROOF CURB ACCESSORY “A” UNIT SIZE 548D CRRFCURB003A00 1 ′ -2 ″ [356] 090-150 CRRFCURB004A00 2 ′ -0 ″ [610] 6. Service clearance 4 ft on each side. 7. Direction of airflow. 8. Connector packages CRBTMPWR001A00 and 00...

Page 3 - MAXIMUM ALLOWABLE; DRAIN PLUG; Drain plug is shown in factory-installed position.

— 3 — II. STEP 2 — FIELD FABRICATE DUCTWORK On vertical discharge units, secure all ducts to roof curb andbuilding structure. Do not connect ductwork to unit. For hori-zontal applications, field-supplied flanges should be attachedto horizontal discharge openings and all ductwork attachedto the flang...

Page 4 - Fig. 5 — Rigging Details

— 4 — NOTES: 1. Dimension in ( ) is in millimeters.2. Hook rigging shackles through holes in base rail, as shown in detail ‘‘A.’’ Holes in base rails are centered around the unit center of grav-ity. Use wooden top skid when rigging to prevent rigging strapsfrom damaging unit. 3. Unit weights do not ...

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