Bryant 549B Series, Installation, Start-Up And Service Instructions Manual

Page: 1 / 48

Cancels: II 549B-90-5 II 549B-90-6
10/15/05
IMPORTANT — READ BEFORE INSTALLING
Read and become familiar with these installation instruc-
tions before installing this unit.
Be sure the installation conforms to all applicable local and
national codes.
These instructions contain important information for the
proper maintenance and repair of this equipment. Retain
these instructions for future use.
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-33
I. Step 1 — Provide Unit Support . . . . . . . . . . . . . . . . . 1
II. Step 2 — Field Fabricate Ductwork
. . . . . . . . . . . . . 1
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 . . . . . . . . . . 6
VI. Step 6 — Adjust Factory-Installed Options . . . . . . 10
VII. Step 7 — Adjust Indoor-Fan Speed . . . . . . . . . . . . 19
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34-36
SERVICE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36-39
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . .40-42
INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . . . CL-1
SAFETY CONSIDERATIONS
Installation and servicing air-conditioning equipment can be
hazardous due to system pressure and electrical compo-
nents. 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, 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.
INSTALLATION
This unit is shipped in the vertical configuration. To convert
to horizontal configuration, remove the side duct opening
covers. Using the same screws, install the covers on the ver-
tical duct openings with the insulation-side down. Seals
around duct openings must be tight.
I. STEP 1 — PROVIDE UNIT SUPPORT
A. Roof Curb
Assemble and install the accessory roof curb in accordance
with instructions shipped with the curb. See Fig. 1. Install
insulation, cant strips, roofing felt, and counter flashing as
shown. Ductwork must be attached to the curb. If electric con-
trol power will be routed through the basepan, use the
appropriate accessory kit listed in Fig. 1, available from your
local distributor. Attach the accessory thru-the-bottom ser-
vice connections to the basepan in accordance with the acces-
sory installation instructions. Connections must be installed
before the unit is set on the roof curb.
IMPORTANT: The gasketing of the unit to the roof curb is
critical for a watertight seal. Install the gasket supplied with
the roof curb as shown in Fig. 1. An improperly applied gas-
ket can also result in air leaks and poor unit performance.
The roof curb should be level. Unit leveling tolerances are
shown in Fig. 2. This is necessary for the unit drain to func-
tion 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 the unit cabinet. Install a gravel apron in front of the
condenser coil air inlet to prevent grass and foliage from
obstructing airflow.
NOTE: Horizontal units may be installed on a roof curb if
required.
C. Alternate Unit Support (Curb or Slab Mount)
A non-combustible sleeper rail can be used in the unit curb
support area. If sleeper rails cannot be used, support the
long sides of the unit with a minimum of 3 equally spaced
4-in. x 4-in. pads on each side.
II. STEP 2 — FIELD FABRICATE DUCTWORK
On vertical discharge units, secure all ducts to the roof curb
and building structure. Do not connect ductwork to the unit.
For horizontal applications, field-supplied flanges should be
attached to horizontal discharge openings and all ductwork
attached to the flanges. Insulate and weatherproof all exter-
nal ductwork, joints, and roof openings with counter flashing
and mastic in accordance with applicable codes.
Ducts passing through an unconditioned space must be insu-
lated and covered with a vapor barrier.
If a plenum return is used on a vertical unit, the return
should be ducted through the roof deck to comply with appli-
cable fire codes.
WARNING: Before performing service or mainte-
nance operations on unit, turn off main power switch
to unit and install lockout tag on disconnect. 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
HIGH-EFFICIENCY HEAT PUMP UNITS
549B
Dura
Pac Plus Series
Sizes 090-120
7 1 /
2
to 10 Tons