Bryant 548F - Manual

Cancels: New II 548F-36-1
8/15/00
IMPORTANT — READ BEFORE INSTALLING
1. Read and become familiar with these installation
instructions before installing this unit.
2. Be sure the installation conforms to all applicable
local and national codes.
3. 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-36
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 . . . . . . . . . . 4
VI. Step 6 — Adjust Factory-Installed Options . . . . . . 13
VII. Step 7 — Adjust Indoor-Fan Speed . . . . . . . . . . . . 20
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37-39
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39-41
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . .42-44
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . . . CL-1
SAFETY CONSIDERATIONS
Installation and servicing of 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
extinguisher available for all brazing operations.
INSTALLATION
Unit is shipped in the vertical discharge configuration. To
convert to horizontal configuration, remove horizontal duct
opening covers. Using the same screws, install covers on duct
openings in basepan of unit with the insulation-side down.
Seals around duct openings 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, not to the unit. If electric or
control power is to be routed through the basepan, attach the
accessory thru-the-bottom service connections to the
basepan and roof curb 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. This is necessary for unit drain to func-
tion properly. Unit leveling tolerances are shown in Fig. 2.
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 gravel apron in front of con-
denser coil air inlet to prevent grass and foliage from
obstructing airflow.
NOTE: Horizontal units may be installed on a roof curb if
required.
II. STEP 2 — FIELD FABRICATE DUCTWORK
Secure all ducts to roof curb and building structure on verti-
cal discharge units. Do not connect ductwork to unit. For hor-
izontal applications, field-supplied flanges should be
attached to horizontal discharge openings and all ductwork
should be attached to the flanges. Insulate and weatherproof
all external 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.
WARNING:

 

  


  


 
 
    


   
        

 
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
548F
Sizes 036-072
3-6 Tons