Bryant 548J*14D Series User manual

548J*14D
SINGLE PACKAGE ROOFTOP
HEAT PUMP
SIZE 14 with PURONR(R--410A) REFRIGERANT
Installation Instructions
548J units for installation in the United States contain use of Bryant's 2-speed indoor fan
control system. This complies with the U.S. Department of Energy (DOE) efficiency standard
of 2018.
548J units for installation outside the United States may or may not contain use of the
2-speed indoor fan control system as they are not required to comply with the U.S.
Department of Energy (DOE) efficiency standard of 2018.
For specific details on operation of the Bryant 2-speed indoor fan system refer to the
Variable Frequency Drive (VFD) Factory-Installed Option 2-Speed Motor Control Installation,
Setup and Troubleshooting manual.
NOTE: Read the entire instruction manual before starting
the installation.
TABLE OF CONTENTS
SAFETY CONSIDERATIONS 3....................
Rated Indoor Airflow (cfm) 4.....................
REFRIGERATION SYSTEM COMPONENTS 7.......
INSTALLATION 9...............................
Jobsite Survey 9................................
Step 1 -- Plan for Unit Location 9..................
Roof Mount 9...............................
Step 2 -- Plan for Sequence of Unit Installation 9......
Curb--Mounted Installation 9...................
Pad--Mounted Installation 9....................
Frame--Mounted Installation 9..................
Step 3 -- Inspect Unit 9...........................
Step 4 -- Provide Unit Support 9...................
Roof Curb Mount 9..........................
Slab Mount (Horizontal Units Only) 11..........
Alternate Unit Support
(In Lieu of Curb or Slab Mount) 11.............
Step 5 -- Field Fabricate Ductwork 11...............
For Units with Accessory Electric Heaters 11.....
Step 6 -- Rig and Place Unit 11....................
Positioning on Curb 11.......................
Step 7 -- Convert to Horizontal and Connect
Ductwork 12...........................
Step 8 -- Install Outside Air Hood 12...............
Economizer Hood Removal and Setup --
Factory Option 12...........................
Two Position Damper Hood Removal and Setup --
Factory Option 13...........................
Economizer Hood and Two--Position Hood 13.....
Step 9 -- Install External Condensate Trap and Line 14.
Step 10 -- Make Electrical Connections 15...........
Field Power Supply 15........................
All Units 16................................
Units Without Factory--Installed
Non--Fused Disconnect 19.....................
Units with Factory--Installed
Non--Fused Disconnect 19.....................
Convenience Outlets 19.......................
Factory--Option Thru--Base Connections 21.......
Units Without Thru--Base Connections 21........
Field Control Wiring 21.......................
Thermostat 21...............................
Central Terminal Board 22......................
Commercial Defrost Control 22..................
Unit Without Thru--Base Conversion Kit 24.......
Heat Anticipator Settings 24...................
Electric Heaters 24............................
Single Point Boxes 25........................
Heater and Supplementary Fuses 25.............
Heater Low--Voltage Control Connections 25......
2--Speed Indoor Fan Motor System with Variable
Frequency Drive (Factory--Installed Option) 26......

2
EconoMi$erRX (Factory--Installed Option) 27......
Product Description 27........................
System Components 27.......................
Specifications 27..............................
W7220 Economizer Module 27.................
Electrical 27................................
Inputs 27...................................
Outputs 28.................................
Environmental 28............................
S--Bus Sensor Wiring 28......................
CO2Sensor Wiring 29........................
Interface Overview 29..........................
User Interface 29............................
Keypad 29.................................
Menu Structure 30.............................
Setup and Configuration 30.....................
Time--out and Screensaver 30..................
Sequence of Operation 36.......................
Enthalpy Settings 40...........................
Two--Speed Fan Operation 40....................
Checkout 41.................................
Power Up 41................................
Initial Menu Display 41.......................
Power Loss (Outage or Brownout) 41............
Status 41...................................
Checkout Tests 41...........................
Troubleshooting 41............................
Alarms 41..................................
Clearing Alarms 41..........................
RTU Open Controller System 42...................
Supply Air Temperature (SAT) Sensor 44.........
Outdoor Air Temperature (OAT) Sensor 44.......
EconoMi$er 2 45............................
Field Connections 45..........................
Space Temperature (SPT) Sensors 45............
Indoor Air Quality (CO2)Sensor 46.............
Outdoor Air Quality Sensor 47.................
Space Relative Humidity Sensor 47.............
Smoke Detector/Fire Shutdown (FSD) 47.........
Connecting Discrete Inputs 47..................
Communication Wiring -- Protocols 48............
General 48.................................
Local Access 49..............................
RTU Open Controller Troubleshooting 49........
Outdoor Air Enthalpy Control 50.................
Differential Enthalpy Control 50................
Return Air Enthalpy Sensor 50.................
Smoke Detectors 51.............................
Step 11 -- Adjust Factory--Installed Options 52........
Step 12 -- Install Accessories 52...................
Step 13 -- Check Belt Tension 52...................
UNIT START--UP CHECKLIST 55..................

3
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service,
maintenance, or use can cause explosion, fire, electrical
shock or other conditions which may cause personal
injury or property damage. Consult a qualified installer,
service agency, or your distributor or branch for
information or assistance. The qualified installer or
agency must use factory--authorized kits or accessories
when modifying this product. Refer to the individual
instructions packaged with the kits or accessories when
installing.
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloths for brazing operations and
have a fire extinguisher available. Read these instructions
thoroughly and follow all warnings or cautions attached to
the unit. Consult local building codes and appropriate
national electrical codes (in USA, ANSI/NFPA70,
National Electrical Code (NEC); in Canada, CSA C22.1)
for special requirements.
It is important to recognize safety information. This is the
safety--alert symbol . When you see this symbol on the
unit and in instructions or manuals, be alert to the
potential for personal injury.
Understand the signal words DANGER, WARNING,
CAUTION, and NOTE. These words are used with the
safety--alert symbol. DANGER identifies the most serious
hazards which will result in severe personal injury or
death. WARNING signifies hazards which could result in
personal injury or death. CAUTION is used to identify
unsafe practices, which may result in minor personal
injury or product and property damage. NOTE is used to
highlight suggestions which will result in enhanced
installation, reliability, or operation.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal
injury or death.
Before performing service or maintenance operations
on unit, always turn off main power switch to unit and
install lockout tag. Unit may have more than one
power switch.
!WARNING
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could cause personal
injury, death and/or equipment damage.
Puronr(R--410A) refrigerant systems operate at
higher pressures than standard R--22 systems. Do not
use R--22 service equipment or components on Puron
refrigerant equipment.
!WARNING
PERSONAL INJURY AND ENVIRONMENTAL
HAZARD
Failure to follow this warning could cause personal
injury or death.
Relieve pressure and recover all refrigerant before
system repair or final unit disposal.
Wear safety glasses and gloves when handling
refrigerants. Keep torches and other ignition sources
away from refrigerants and oils.
!WARNING
CUT HAZARD
Failure to follow this caution may result in personal
injury.
Sheet metal parts may have sharp edges or burrs. Use
care and wear appropriate protective clothing, safety
glasses and gloves when handling parts and servicing
heat pump units.
CAUTION
!

4
Rated Indoor Airflow (cfm)
The table to the right lists the rated indoor airflow used
for the AHRI efficiency rating for the units covered in this
document.
Model Number Full Load Airflow (cfm)
548J*14D 4500
Model
J - Puron
®
(R-410A) Refrigerant
Unit Type
548 - Packaged Heat Pump with
optional electric heat
Packaging and 2-Speed Indoor Fan Motor
A = Standard Packaging, electro-mechanical
controls, requires W7212 EconoMi$er
®
IV
B = LTL Packaging, electro-mechanical controls,
requires W7212 EconoMi$er IV
C = Standard Packaging, electro-mechanical
controls, requires W7220 EconoMi$er X
D = Standard Packaging and 2-Speed Indoor
Fan Motor (VFD) controller
E = LTL Packaging and 2-Speed Indoor Fan
Motor (VFD) controller
F = LTL Packaging, electro-mechanical controls,
requires W7220 EconoMi$er X
Cooling Tons
14 - 12.5 tons
Heat Level
(Field installed electric heaters available)
000 = No Heat
Indoor Fan Options
1 = Standard Static Option
2 = Medium Static Option
C = High Static Option with High Efficiency Motor
Refrig. System/Gas Heat Options
D = Two-Stage cooling models
Coil Options (Outdoor - Indoor - Hail Guard)
A = Al/Cu - Al/Cu
B = Precoat Al/Cu - Al/Cu
C = E-coat Al/Cu - Al/Cu
D = E-coat Al/Cu - E-coat Al/Cu
E = Cu/Cu - Al/Cu
F = Cu/Cu - Cu/Cu
M = Al/Cu -Al/Cu — Louvered Hail Guard
N = Precoat Al/Cu - Al/Cu — Louvered Hail Guard
P = E-coat Al/Cu - Al/Cu — Louvered Hail Guard
Q = E-coat Al/Cu - E-coat Al/Cu — Louvered Hail Guard
R = Cu/Cu - Al/Cu — Louvered Hail Guard
S = Cu/Cu - Cu/Cu — Louvered Hail Guard
Voltage
E = 460-3-60
P = 208/230-3-60
T = 575-3-60
Example:
Position:
548J 14 00 1B0AA
1234
P
56 7
D
89
10
0
11
A
12 13 14 15 16 17
Factory Installed Options
0A = None
NOTE: See the 548J 6 to 12.5 ton Price Pages for
a complete list of factory installed options.
Outdoor Air Options
A = None
B = Temperature Economizer, Barometric Relief,
Standard Leak (W7212 or W7220)
E = Temperature Economizer, Barometric Relief,
Standard Leak w/CO
2
, (W7212 or W7220)
H =
Enthalpy Economizer, Barometric Relief,
Standard Leak, (W7212 or W7220)
L =
Enthalpy Economizer,Barometric Relief,
Standard Leak w/CO
2
, (W7212 or W7220)
Q = Motorized 2 Position Damper
U = Temperature
Economizer, Barometric Relief,
Ultra Low Leak, (W7220)
W = Enthalpy Economizer, Barometric Relief,
Ultra Low Leak, (W7220)
a548J---010
Fig. 1 -- 548J*14D Model Number Nomenclature (Example)

5
a548J---011
Fig. 2 -- Unit Dimensional Drawing – Size 14 Unit

6
a548J---012
Fig. 2 -- Unit Dimensional Drawing – Size 14 Unit (cont)

7
CD
A
B
C09897B
LOCATION DIMENSION CONDITION
A
48--- in (1219 mm)
18--- in (457 mm)
18--- in (457 mm)
12--- in (305 mm)
Unit disconnect is mounted on panel
No disconnect, convenience outlet option
Recommended service clearance
Minimum clearance
B
42--- in (1067 mm)
36--- in (914 mm)
Special
Surface behind servicer is grounded (e.g., metal, masonry wall)
Surface behind servicer is electrically non--- conductive (e.g., wood, fiberglass)
Check sources of flue products within 10--- ft of unit fresh air intake hood
C36--- in (914 mm)
18--- in (457 mm)
Side condensate drain is used
Minimum clearance
D42--- in (1067 mm)
36--- in (914 mm)
Surface behind servicer is grounded (e.g., metal, masonry wall, another unit)
Surface behind servicer is electrically non--- conductive (e.g., wood, fiberglass)
NOTE: Unit not designed to have overhead obstruction. Contact Application Engineering for guidance on any application
planning overhead obstruction or for vertical clearances.
Fig. 3 -- Service Clearance Dimensional Drawing
REFRIGERATION SYSTEM
COMPONENTS
Each heat pump refrigeration system includes a
compressor, accumulator, reversing valve, dual--function
outdoor coil with vapor header check valve, cooling liquid
line with a filter drier and a check valve, dual--function
indoor coil with a vapor header check valve, and heating
liquid line with a check valve and a strainer. Size 14 units
have two compressor--circuits. See Fig. 4 for typical unit
piping schematic (4--row indoor coil with two
compressor--circuits is shown).
Dual--function outdoor and indoor coils are designed to
provide parallel coil circuits during evaporator--function
operation and converging coil circuits during the
condenser--function operation.
Reversing Valve and Check Valve Position
See Fig. 4 (on page 8) and Tables 1 -- 3.
Troubleshooting Refrigerant Pressure Problems and
Check Valves
Refer to Fig. 4 and the Cooling Mode and Heating Mode
tables (Tables 1 and 2).
Refrigerant System Pressure Access Ports
There are two access ports in each circuit -- on the suction
tube and the discharge tube near the compressor. These are
brass fittings with black plastic caps. The hose connection
fittings are standard 1/4--inch SAE male flare couplings.
The brass fittings are two--piece High Flow valves, with a
receptacle base brazed to the tubing and an integral
spring--closed check valve core screwed into the base. See
Fig. 5 on page 8. This check valve is permanently
assembled into this core body and cannot be serviced
separately. Replace the entire core body if necessary. Service
tools are available from Replacement Components that
allow the replacement of the check valve core without
having to recover the entire system refrigerant charge. Apply
compressor refrigerant oil to the check valve core’s bottom
O--ring. Install the fitting body and torque to 96 10 in--lbs
(10.9 1 Nm). Do not exceed 106 in--lbs (11.9 Nm) when
tightening.
Table 1 – Cooling Mode (each circuit)
Component Status/Position
Reversing Valve Energized
Check Valve A Closed
Check Valve B Open
Check Valve C Closed
Check Valve D Open

8
Table 2 – Heating Mode (each circuit)
Component Status/Position
Reversing Valve De--- energized
Check Valve A Open
Check Valve B Closed
Check Valve C Open
Check Valve D Closed
Table 3 – Defrost Mode
Component Status/Position
Defrost Thermostat Closed
Outdoor Fan(s) Off
Reversing Valve Energized
Check Valve A Closed
Check Valve B Open
Check Valve C Closed
Check Valve D Open
COMPRESSOR
ACCUMULATOR
HPS
COMPRESSOR
ACCUMULATOR
HPS
Filter
Drier 2B
1B
LPS/LOC
Acutrol DFT 1
Cooling Liquid Lines
DFT 2
2A
1A
1D
2D
Outdoor Coil
Indoor Coil
Comp 2
Comp 1
2C
1C Strainer
Heating Mode Liquid Lines
Acutrol
Reversing
Valve
Reversing
Valve
C160139
Fig. 4 -- Typical Unit Piping Schematic
5/8” HEX 0.47
30°
0.596
1/2-20 UNF RH
1/2” HEX
45°
WASHER
O-RING
7/16-20 UNF RH
DEPRESSOR PER AHRI 720
+.01/-.035
FROM FACE OF BODY
This surface provides a metal to metal seal when
torqued into the seat. Appropriate handling is
required to not scratch or dent the surface.
SEAT CORE
(Part No. EC39EZ067)
a548J---009
Fig. 5 -- CoreMax* Access Port Assembly
* CoreMax is a registered trademark of Fastest, Inc.

9
INSTALLATION
Jobsite Survey
Complete the following checks before installation.
1. Consult local building codes and the NEC (National
Electrical Code) ANSI/NFPA 70 for special installa-
tion requirements.
2. Determine unit location (from project plans) or select
unit location.
3. Check for possible overhead obstructions which may
interfere with unit lifting or rigging.
Step 1 — Plan for Unit Location
Select a location for the unit and its support system (curb
or other) that provides for at least the minimum clearances
required for safety. This includes the clearance to
combustible surfaces, unit performance and service access
below, around and above unit as specified in unit
drawings. See Fig. 3.
NOTE: Consider also the effect of adjacent units.
Unit may be installed directly on wood flooring or on Class
A, B, or C roof--covering material when roof curb is used.
Do not install unit in an indoor location. Do not locate air
inlets near exhaust vents , relief valves, or other sources of
contaminated air.
Although unit is weatherproof, avoid locations that permit
water from higher level runoff and overhangs to fall onto
the unit.
Select a unit mounting system that provides adequate
height to allow for removal and disposal of frost and ice
that will form during the heating--defrost mode as well as
allow installation of condensate trap per requirements.
RefertoStep9—InstallExternalCondensate Trap and
Line – for required trap dimensions.
Roof Mount —
Check building codes for weight distribution
requirements. Unit operating weight is shown in Table 4.
Table 4 – Operating Weights
548J*14D UNITS LB (KG)
Base Unit 1370 (620)
Economizer
Vertical 100 (45)
Horizontal 115 (52)
Powered Outlet 32 (15)
Curb
14---in/356 mm 180 (82)
24---in/610 mm 235 (107)
Step 2 — Plan for Sequence of Unit Installation
The support method used for this unit will dictate different
sequences for the steps of unit installation. For example,
on curb--mounted units, some accessories must be
installed on the unit before the unit is placed on the curb.
Review the following for recommended sequences for
installation steps.
Curb--Mounted Installation —
Install curb
Install field--fabricated ductwork inside curb
Install accessory thru--base service connection package
(affects curb and unit) (refer to accessory installation
instructions for details)
Prepare bottom condensate drain connection to suit
planned condensate line routing (refer to Step 9 for
details)
Rig and place unit
Install outdoor air hood
Install condensate line trap and piping
Make electrical connections
Install other accessories
Pad--Mounted Installation —
Prepare pad and unit supports
Check and tighten the bottom condensate drain
connection plug
Rig and place unit
Convert unit to side duct connection arrangement
Install field--fabricated ductwork at unit duct openings
Install outdoor air hood
Install condensate line trap and piping
Make electrical connections
Install other accessories
Frame--Mounted Installation —
Frame--mounted applications generally follow the
sequence for a curb installation. Adapt as required to
suit specific installation plan.
Step 3 — Inspect Unit
Inspect unit for transportation damage. File any claim
with transportation agency.
Confirm before installation of unit that voltage, amperage
and circuit protection requirements listed on unit data
plate agree with power supply provided.
Step 4 — Provide Unit Support
Roof Curb Mount —
Accessory roof curb details and dimensions are shown in
Fig. 6. Assemble and install accessory roof curb in
accordance with instructions shipped with the curb.
NOTE: The gasketing of the unit to the roof curb is
critical for a watertight seal. Install gasket supplied with
the roof curb as shown in Fig. 5. Improperly applied
gasket can also result in air leaks and poor unit
performance.
Curb should be level. This is necessary for unit drain to
function properly. Unit leveling tolerances are show in
Fig. 7. Refer to Accessory Roof Curb Installation
Instructions for additional information as required.

10
a548J---013
Fig. 6 -- Roof Curb Details

11
A-B
0.5″ (13)
B-C
1.0″ (25)
A-C
1.0″ (25)
MAXIMUM ALLOWABLE
DIFFERENCE IN. (MM)
a50---9658
Fig. 7 -- Unit Leveling Tolerances
Install insulation, cant strips, roofing felt, and counter
flashing as shown. Ductwork must be attached to curb and
not to the unit.
If electric and control wiring is to be routed through the
basepan, attach the accessory thru--the--base service
connections to the basepan in accordance with the
accessory installation instructions.
Slab Mount (Horizontal Units Only) —
Provide a level concrete slab that extends a minimum of
6 in. (150 mm) beyond unit cabinet. Install a 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.
Alternate Unit Support (In Lieu of 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. (102 mm x 102 mm) pads on each side.
Step 5 — Field Fabricate Ductwork
Cabinet return-air static pressure (a negative condition)
shall not exceed 0.35 in. wg (87 Pa) with economizer or
0.45 in. wg (112 Pa) without economizer.
For vertical ducted applications, secure all ducts to roof curb
and building structure. Do not connect ductwork to unit.
Insulate and weatherproof all external ductwork, joints,
and roof openings with counter flashing and mastic in
accordance with applicable codes.
Ducts passing through unconditioned spaces must be
insulated 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
applicable fire codes.
For Units with Accessory Electric Heaters —
All installations require a minimum clearance to
combustible surfaces of 1--in. (25 mm) from duct for first
12--in. (305 mm) away from unit.
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in damage
to roofing materials.
Membrane roofs can be cut by sharp sheet metal
edges. Be careful when placing any sheet metal parts
on such roof.
CAUTION
!
Step 6 — Rig and Place Unit
When the unit is ready to be rigged and no longer will be
lifted by a fork truck, the wood protector under the basepan
must be removed. Remove 4 screws from each base rail.
Wood protector will drop to the ground. See instructions on
the unit base rails.
Keep unit upright and do not drop. Spreader bars are
required. Rollers may be used to move unit across a roof.
Level by using unit frame as a reference. See Table 4 and
Fig. 9 for additional information.
Lifting holes are provided in base rails as shown in Fig. 9.
Refer to rigging instructions on unit.
Rigging materials under unit (cardboard or wood) must be
removed PRIOR to placing the unit on the roof curb.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in
equipment damage.
All panels must be in place when rigging. Unit is not
designed for handling by fork truck.
CAUTION
!
Before setting the unit onto the curb, recheck gasketing on
curb.
PositioningonCurb—
For full perimeter curbs CRRFCURB072A00 and 073A00,
the clearance between the roof curb and the front and rear
base rails should be 1/4in. (6.4 mm). The clearance between
the curb and the end base rails should be 1/2in. (13 mm).
For retrofit applications with curbs CRRFCURB003A01 and
4A01, the unit should be position as shown in Fig. 8.
Maintain the 15 1/2in. (394 mm) and 8 5/8in. (220 mm)
clearances and allow the 22 5/16 in. (567 mm) dimension to
float if necessary.
C10003
Fig. 8 -- Retrofit Installation Dimensions

12
DETAIL “A”
SEE DETAIL “A”
914 - 1371
( 36” - 54” )
“B”
“A”
“C”
PLACE ALL GASKET IN PLACE BEFORE PLACING
UNIT ON ROOF CURB.
DUCT END
C10281
UNIT MAX WEIGHT DIMENSIONS
A B C
LB KG IN MM IN MM IN MM
548J*14D 2015 916 116.0 2945 55.5 1410 59.5 1510
NOTES:
1. Dimensions in ( ) are 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 gravity. Use wooden top to prevent rigging straps from damaging unit.
Fig. 9 -- Rigging Details
If the alternative condensate drain location through the
bottom of the unit is used in conjunction with a retrofit curb,
the hole in the curb must be moved 121/2in (320 mm)
towards the end of the unit.
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
Remove all shipping materials and top skid. Remove extra
center post from the condenser end of the unit so that the
condenser end of the unit matches Fig. 19 -- 21. Recycle
or dispose of all shipping materials.
Step 7 — Convert to Horizontal and Connect
Ductwork (when required)
Unit is shipped in the vertical duct configuration. Unit
without factory--installed economizer or return air smoke
detector option may be field--converted to horizontal ducted
configuration using accessory CRDUCTCV001A00. To
convert to horizontal configuration, remove screws from side
duct opening covers and remove covers.
Discard the supply duct cover. Install accessory
CRDUCTCV001A00 to cover the vertical supply duct
opening. Use the return duct cover removed from the end
panel to cover the vertical return duct opening.
Field--supplied flanges should be attached to horizontal
duct openings and all ductwork should be secured to the
flanges. Insulate and weatherproof all external ductwork,
joints, and roof or building openings with counter flashing
and mastic in accordance with applicable codes.
Do not cover or obscure visibility to the unit’s informative
data plate when insulating horizontal ductwork.
C06108
Fig. 10 -- Horizontal Conversion Panels
Step 8 — Install Outside Air Hood
Economizer Hood Removal and Setup --
Factory Option —
1. The hood is shipped in knock--down form and located
in the return air compartment. It is attached to the
economizer using two plastic tie--wraps.
2. To gain access to the hood, remove the filter access
panel. (See Fig. 11.)
3. Locate and cut the (2) plastic tie--wraps, being careful
to not damage any wiring. (See Fig. 12.)
4. Carefully lift the hood assembly through the filter
access opening and assemble per the steps outlined in
Economizer Hood and Two–Position Hood on page 13.

13
FILTER ACCESS PANEL
INDOOR COIL ACCESS PANEL
C10004
Fig. 11 -- Typical Access Panel Locations
Economizer
Cut Plastic Ties
(2) Places
Remove Hood Parts
C10005
Fig. 12 -- Economizer Wiring
Hood Parts
Plastic Tie Wrap
Qty (2)
Screws for Metal Tray
Qty (2)
C10006
Fig. 13 -- Damper Assembly
Two Position Damper Hood Removal and Setup --
Factory Option —
1. The hood is shipped in knock--down form and
assembled to a metal support tray using plastic stretch
wrap. Located in the return air compartment, the
assembly’s metal tray is attached to the basepan and
also attached to the damper using two plastic
tie--wraps.
2. To gain access to the hood, remove the filter access
panel. (See Fig. 11.)
3. Locate the (2) screws holding the metal tray to the
basepan and remove. In order to remove the screws, it
may be necessary to remove the panel underneath the
two--position damper. Remove the two screws. Locate
and cut the (2) plastic tie--wraps securing the
assembly to the damper. (See Fig. 13.) Be careful to
not damage any wiring or cut tie--wraps securing any
wiring.
4. Carefully lift the hood assembly (with metal tray)
through the filter access opening and assemble per the
steps outlined in Economizer Hood and Two–Position
Hood.
5. If removed, reattach the panel under the damper.
Economizer Hood and Two--Position Hood —
NOTE: If the power exhaust accessory is to be installed
on the unit, the hood shipped with the unit will not be
used and must be discarded. Save the aluminum filter for
use in the power exhaust hood assembly.
1. The indoor coil access panel will be used as the top of
the hood. If the panel is still attached to the unit, re-
move the screws along the sides and bottom of the
panel. See Fig. 14.
SIDE
PANEL
INDOOR
COIL
ACCESS
PANEL
INDOOR
COIL
ACCESS
PANEL
CAULK
HERE
TOP
PANEL
RAIN DEFLECTORS
C10007
Fig. 14 -- Indoor Coil Access Panel Relocation
2. Swing out indoor coil access panel and insert the
hood sides under the panel (hood top). Be careful not
to lift the panel too far as it might fall out. Use the
screws provided to attach the hood sides to the hood
top. Use screws provided to attach the hood sides to
the unit. See Fig. 15.

14
TOP
PANEL
INDOOR COIL
ACCESS PANEL
SCREW
HOOD DIVIDER
LEFT
HOOD
SIDE
C10008
Fig. 15 -- Economizer Hood Construction
3. Remove the shipping tape holding the economizer
barometric relief damper in place.
4. Insert the hood divider between the hood sides. See
Fig. 15 and 16. Secure hood divider with 3 screws on
each hood side. The hood divider is also used as the
bottom filter rack for the aluminum filter.
5. Attach the post that separates the filters with the
screws provided.
6. Open the filter clips which are located underneath the
hood top. Insert the aluminum filters into the bottom
filter rack (hood divider). Push the filter into position
past the open filter clips. Close the filter clips to lock
the filters into place. See Fig. 16.
DIVIDER
BAROMETRIC
RELIEF
CLEANABLE
ALUMINUM
FILTER
FILTER
HOOD
FILTER
CLIP
OUTSIDE
AIR
C10009
Fig. 16 -- Economizer Filter Installation
7. Install the two rain deflectors on the edge of the hood
topasshowninFig.14.
8. Caulk the ends of the joint between the unit top panel
and the hood top as shown in Fig. 14.
9. Replace the filter access panel.
Step 9 — Install External Condensate Trap and
Line
The unit has one 3/4-in. condensate drain connection on
the end of the condensate pan and an alternate connection
on the bottom. See Fig. 17. Unit airflow configuration
does not determine which drain connection to use. Either
drain connection can be used with vertical or horizontal
applications.
When using the standard side drain connection, ensure the
red plug in the alternate bottom connection is tight. Do
this before setting the unit in place. The red drain pan can
be tightened with a 1/2--in. square socket drive extension.
To use the alternate bottom drain connection, remove the
red drain plug from the bottom connection (use a 1/2-- i n .
square socket drive extension) and install it in the side
drain connection.
DRAIN
(FACTORY-INSTALLED)
PLUG
CONDENSATE PAN (SIDE VIEW)
STANDARD
SIDE DRAIN
ALTERNATE
BOTTOM DRAIN
C08021
Fig. 17 -- Condensate Drain Pan (Side View)
The piping for the condensate drain and external trap can
be completed after the unit is in place. See Fig. 18.
NOTE: Trap should be deep enough to offset maximum unit static
difference. A 4 in. (102 mm) trap is recommended.
MINIMUM PITCH
1” (25mm) PER
10’ (3m) OF LINE
BASE RAIL
OPEN
VENT
TO ROOF
DRAIN
DRAIN PLUG
ROOF
CURB
SEE NOTE
3˝(76mm)
MIN
a50---9660
Fig. 18 -- Condensate Drain Piping Details
All units must have an external trap for condensate
drainage. Install a trap at least 4-in. (102 mm) deep and
protect against freeze-up. If drain line is installed
downstream from the external trap, pitch the line away
from the unit at 1-in. per 10 ft (25 mm in 3 m) of run. Do
not use a pipe size smaller than the unit connection
(3/4-in.).

15
Step 10 — Make Electrical Connections
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Do not use gas piping as an electrical ground. Unit
cabinet must have an uninterrupted, unbroken
electrical ground to minimize the possibility of
personal injury if an electrical fault should occur. This
ground may consist of electrical wire connected to
unit ground lug in control compartment, or conduit
approved for electrical ground when installed in
accordance with NEC (National Electrical Code);
ANSI/NFPA 70, latest edition (in Canada, Canadian
Electrical Code CSA [Canadian Standards
Association] C22.1), and local electrical codes.
!WARNING
NOTE: Check all factory and field electrical connections
for tightness. Field--supplied wiring shall conform with
the limitations of 63_F(33_C) rise.
Field Power Supply —
For those units without through--the--curb power, conduit
must be used to route the main power from the condenser
end of the unit to either the factory option disconnect, the
bottom of the control box or the single point box accessory.
1 inch conduit is provided behind the access panel located
under the control box. For those units that require conduit
larger than 1 inch, it must be field supplied. Figures 19--21
show the various wire routings.
If the field disconnect is larger than 100A, it must be
attached to the unit using accessory CRDISBKT001A00
(see Fig. 22). Follow the instructions provided with this
accessory. For smaller field disconnects, be sure to use 1/2in.
screws to mount the disconnect directly to the end panel
(see Fig. 23). In either case, set the disconnect vertical
location on the unit so that a 90 degree fitting can be used
to connect the conduit to the disconnect.
C10010
Fig. 19 -- Conduit into Factory Option Disconnect
C10011
Fig. 20 -- Conduit into Control Box
C10012
Fig. 21 -- Conduit into Single Point Box
C10014
Fig. 22 -- Mounting Position for Field Disconnects
(over 100A)

16
C10013
Fig. 23 -- Mounting Position for Field Disconnects
(up to 100A)
All units except 208/230-v units are factory wired for the
voltage shown on the nameplate. If the 208/230-v unit is
to be connected to a 208-v power supply, the control
transformer must be rewired by moving the black wire
with the 1/4-in. female spade connector from the 230--v
connection and moving it to the 200-v 1/4-in. male
terminal on the primary side of the transformer. Refer to
unit label diagram for additional information.
Field power wires are connected to the unit at line--side
pressure lugs at the main terminal block (TB1) or at
factory--installed option non--fused disconnect switch.
Max wire size is #2 AWG (copper only). (See Fig. 25)
NOTE: TEST LEADS -- Unit may be equipped with
short leads (pigtails) on the field line connection points off
the optional disconnect switch. These leads are for factory
run--test purposes only; remove and discard before
connecting field power wires to unit connection points.
Make field power connections directly to line connection
pressure lugs only.
FIRE HAZARD
Failure to follow this warning could result in
intermittent operation or performance satisfaction.
Do not connect aluminum wire between disconnect
switch and furnace. Use only copper wire.
(See Fig. 24.)
!WARNING
COPPER
WIRE ONLY
ELECTRIC
DISCONNECT
SWITCH
ALUMINUM
WIRE
A93033
Fig. 24 -- Disconnect Switch and Unit
Units Without Disconnect Option
Units With Disconnect Option
2
4
6
1
3
5
L1
L2
L3
Optional
Disconnect
Switch
Disconnect factory test leads; discard.
Factory
Wiring
11 13 13
L1 L2 L3
TB1
208/230-3-60
460-3-60
575-3-60
Disconnect
per
NEC
C10015
Fig. 25 -- Power Wiring Connections
All Units --
All field wiring must comply with the NEC and local
requirements.
Size wire based on MCA (Minimum Circuit Amps) on the
unit informative plate. See Fig. 25 and the unit label
diagram for power wiring connections to the unit power
terminal blocks and equipment ground. Maximum wire
size is #2/0 AWG per pole.
Provide a ground--fault and short--circuit over--current
protection device (fuse or breaker) per NEC Article 440
(or local codes). Refer to unit informative data plate for
MOCP (Maximum Over--current Protection) device size.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage.
Operation on improper line voltage or excessive phase
imbalance constitutes abuse and may cause damage to
electrical components. Such operation would invalidate
any applicable Bryant warranty.
CAUTION
!

17
a50---9707
Fig. 26 -- Typical 548J Size 14 Control Wiring Diagram

18
a50---9708
Fig. 27 -- Typical 548J Size 14 Power Wiring Diagram (208/230V 3 Phase 60Hz unit shown)
Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate. On
3--phase units, voltages between phases must be balanced
within 2% and the current within 10%. Use the formula
below to determine the percent of voltage imbalance.
%Voltage
Imbalance = 100 x max voltage deviation from average voltage
average voltage
Example: Supply voltage is 230-3-60
AB = 224 v
BC = 231 v
AC = 226 v
Average Voltage = (224 + 231 + 226) =681 = 227
33
Determine maximum deviation from average voltage.
(AB) 227 – 224 = 3 v
(BC) 231 – 227 = 4 v
(AC) 227 – 226 = 1 v
Maximum deviation is 4 v.
Determine percent of voltage imbalance.
%VoltageImbalance = 100 x 4= 1.76%
227
This amount of phase imbalance is satisfactory as it is below the
maximum allowable 2%.
IMPORTANT: If the supply voltage phase imbalance is more than
2%, contact your local electric utility company immediately.
Operation on improper line voltage or excessive phase
imbalance constitutes abuse and may cause damage to
electrical components. Such operation would invalidate
any applicable Bryant warranty.

19
Units Without Factory--Installed
Non--Fused Disconnect —
When installing units, provide a disconnect switch of
adequate size per NEC (National Electrical Code).
Disconnect sizing data is provided on the unit informative
plate. Locate on unit cabinet or within sight of the unit per
national or local codes. Do not cover unit informative
plate if mounting the disconnect on the unit cabinet.
Units with Factory--Installed Non--Fused Disconnect —
The factory--installed option disconnect switch is located
in a weatherproof enclosure located under the main
control box. The manual switch handle is accessible
through an opening in the access panel. Discard the
factory test leads (see Fig. 25). The factory disconnect is
an 80A disconnect.
C12324
Fig. 28 -- Location of Non--Fused Disconnect Enclosure
To field install the NFD shaft and handle:
1. Remove the unit front panel (see Fig. 2).
2. Remove (3) hex screws on the NFD enclosure -- (2) on
the face of the cover and (1) on the bottom.
3. Remove the front cover of the NFD enclosure.
4. Make sure the NFD shipped from the factory is at
OFF position (the arrow on the black handle knob is
at OFF).
5. Insert the shaft with the cross pin on the top of the shaft
in the horizontal position.
6. Measure the tip of the shaft to the top surface of the
pointer to be 3.75 to 3.88 in. (95 to 99 mm) for 80A
and 100A NFD and 3.43 to 3.56 in. (87 to 90 mm) for
200A NFD.
7. Tighten the locking screw to secure the shaft to the
NFD.
8. Turn the handle to the OFF position with red arrow
pointing at OFF.
9. Install the handle on to the painted cover horizontally
with the red arrow pointing to the left.
10. Secure the handle to the painted cover with (2) screws
and lock washers supplied.
11. Engaging the shaft into the handle socket, re--install
(3) hex screws on the NFD enclosure.
12. Re--install the unit front panel.
C12325
Fig. 29 -- Handle and Shaft Assembly for NFD
Convenience Outlets —
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal
injury or death.
Units with convenience outlet circuits may use
multiple disconnects. Check convenience outlet for
power status before opening unit for service. Locate
its disconnect switch, if appropriate, and open it.
Tag--out this switch, if necessary.
!WARNING
Two types of convenience outlets are offered as
factory--installed options on 548J units: Non--powered and
unit--powered. Both types provide a 125--volt GFCI
(ground--fault circuit--interrupter) duplex receptacle rated
at 15--A behind a hinged waterproof access cover, located
on the end panel of the unit. See Fig. 30.
A 20 amp non--powered convenience outlet is available as
a field--installed accessory.
Non--powered type: This type requires the field installation
of a general--purpose 125--volt 15--A circuit powered from a
source elsewhere in the building. Observe national and local
codes when selecting wire size and conduit requirements,
fuse or breaker requirements and disconnect switch size and
location. Route 125--v power supply conductors into the
bottom of the utility box containing the duplex receptacle.

20
Convenience
Outlet
GFCI
Pwd-CO
Fuse
Switch
Pwd-CO
Transformer
Disconnect
Access Panel
C10361
Fig. 30 -- Convenience Outlet Location
Unit--powered type: A unit--mounted transformer is
factory--installed to stepdown the main power supply
voltage to the unit to 115--v at the duplex receptacle. This
option also includes a manual switch with fuse, located in
a utility box and mounted on a bracket behind the
convenience outlet; access is through the panel beneath
the control box. See Fig. 30.
The primary leads to the convenience outlet transformer
are not factory--connected. Selection of primary power
source is a customer--option. If local codes permit, the
transformer primary leads can be connected at the
line--side terminals on the unit--mounted non--fused
disconnect switch; this will provide service power to the
unit when the unit disconnect switch is open. Other
connection methods will result in the convenience outlet
circuit being de--energized when the unit disconnect
switch is open. See Fig. 31. On a unit without a
unit--mounted disconnect, connect the source leads to the
main terminal block (TB1).
If the convenience outlet transformer is connected to the
line side of a field disconnect, the conduit provided with
the unit must be used to protect the wires as they are
routed from the transformer to the field disconnect. The
end of the conduit with the straight connector attaches to
the field disconnect. The other end does not need to
connect to the transformer; however, the conduit must be
routed so that all wiring is either in the conduit or behind
the access panel.
If the convenience outlet transformer is connected to the
line side of the factory disconnect option, route the wires
through the web bushing located on the bottom of the
disconnect box. For the load side wiring to the factory
option disconnect, route the wires through the hole on the
right side of the disconnect. Be sure to create a drip loop
at least 6 inches long.
Duty Cycle: the unit--powered convenience outlet has a
duty cycle limitation. The transformer is intended to
provide power on an intermittent basis for service tools,
lamps, etc; it is not intended to provide 15--amps loading
for continuous duty loads (such as electric heaters for
overnight use). Observe a 50% limit on circuit loading
above 8--amps (i.e., limit loads exceeding 8--amps to 30
minutes of operation every hour).
Test the GFCI receptacle by pressing the TEST button on
the face of the receptacle to trip and open the receptacle.
Check for proper grounding wires and power line phasing
if the GFCI receptacle does not trip as required. Press the
RESET button to clear the tripped condition.
C08283
UNIT
VOLTAGE
CONNECT
AS
PRIMARY
CONNECTIONS
TRANSFORMER
TERMINALS
208,
230 240 L1: RED +YEL L2: BLU + GRA
H1 + H3
H2 + H4
460 480
L1: RED
Splice BLU + YEL
L2: GRA
H1
H2 + H3
H4
575 600 L1: RED
L2: GRA
H1
H2
Fig. 31 -- Unit Powered Convenience Outlet Wiring
Fuse on power type: The factory fuse is a Bussman
“Fusetron” T--15, non--renewable screw--in (Edison base)
type plug fuse.
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal
injury or death.
Using unit--mounted convenience outlets: Units with
unit--mounded convenience outlet circuits will often
require that two disconnects be opened to de--energize
all power to the unit. Treat all units as electrically
energized until the convenience outlet power is also
checked and de--energization is confirmed. Observe
National Electrical Code Article 210, Branch Circuits,
for use of convenience outlets.
!WARNING