Bryant 548J*D Series User manual

548J***D
SINGLE PACKAGE ROOFTOP
HEAT PUMP
WITH WITH PURONE(R--410A) REFRIGERANT
SIZES 08 AND 09
Installation Instructions
NOTE: Read the entire instruction manual before starting
the installation.
TABLE OF CONTENTS
SAFETY CONSIDERATIONS 1....................
INSTALLATION 3...............................
Step 1 -- Plan for Unit Location 3..................
Step 2 -- Plan for Sequence of Unit Installation 4......
Step 3 -- Inspect Unit 4...........................
Step 4 -- Provide Unit Support 5...................
Step 5 -- Field Fabricate Ductwork 7................
Step 6 -- Rig and Place Unit 7.....................
Step 7 -- Convert to Horizontal & Connect Ductwork 8.
Step 8 -- Install Outside Air Hood 8................
Step 9 -- Install External Condensate Trap and Line 10.
Step 10 -- Make Electrical Connections 11...........
Step 11 -- Adjust Factory--Installed Options 32........
Step 12 -- Install Accessories 33...................
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.

2
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
!
548J***D

3
Horizontal Connections / Economizer
Vertical Connections / Economizer
C08679
Fig. 1 -- Unit Dimensional Drawing – 08 and 09 Size Units
548J***D

4
C08680
Fig. 1 -- Unit Dimensional Drawing – 08 and 09 Size Unit (cont.)
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 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. 2.
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 or other sources of contaminated
air.
18” (457)
42" (1067)
18" (457)
42" (1067)
1
Required bottom condensate drain connection.
Otherwise, 36” (914mm) for condensate connection.
1
C07459
Fig. 2 -- Service Clearance Dimensional Drawing
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 durring the heating--defrost mode as well as
allow installation of condensate trap per requirements.
RefertoStep9—InstallExternalCondensate Trap and
Line – for required trap dimensions.
548J***D

5
Roof mount —
Check building codes for weight distribution
requirements. Unit operating weight is shown in Table 1.
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. 3. 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. 3. 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. 4. Refer to Accessory Roof Curb Installation
Instructions for additional information as required.
Install insulation, cant strips, roofing felt, and counter
flashing as shown. Ductwork must be attached to curb and
not to the unit. The accessory thru--the--base power package
must be installed before the unit is set on the roof curb.
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.
Table 1 – Operating Weights
548J***D UNITS LB (KG)
Component 08D 09D
Base Unit 885 (401) 910 (413)
Economizer
Vertical 80 (36) 80 (36)
Horizontal 105 (48) 105 (48)
Powered Outlet 32 (15) 32 (15)
Curb
14---in/356 mm 143 (65) 143 (65)
24---in/610 mm 153 (69) 153 (69)
548J***D

6
548J08, 09
548J08, 09
UNIT SIZE
ROOFCURB
ACCESSORY
CRRFCURB003A01
CRRFCURB004A01
1’ - 2”
[356]
2’ - 0”
[610]
C08651
Fig. 3 -- Roof Curb Details
548J***D

7
A-B
0.5” (13)
B-C
1.0” (25)
A-C
1.0” (25)
MAXIMUM ALLOWABLE
DIFFERENCE IN. (MM)
C06110
Fig. 4 -- Unit Leveling Tolerances
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: Horizontal
applications require a minimum clearance to combustible
surfaces of 1--in (25 mm) from duct for first 12--in (305 mm)
away from unit. Vertical applications do not require a
minimum clearance is not required around ductwork.
Step 6 — Rig and Place Unit
Keep unit upright and do not drop. Spreader bars are not
required if top crating is left on unit. Rollers may be used to
move unit across a roof. Level by using unit frame as a
reference. See Table 1 and Fig. 5 for additional information.
Lifting holes are provided in base rails as shown in Fig. 5.
Refer to rigging instructions on unit.
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.
C06005
UNIT MAX WEIGHT DIMENSIONS
A B C
LB KG IN MM IN MM IN MM
548J*08D 1235 560 88.13 2238 39.94 1014 49.38 1253
548J*09D 1260 572 88.13 2238 39.63 1006 49.38 1253
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. 5 -- Rigging Details
548J***D

8
PositioningonCurb—
Position unit on roof curb so that the following clearances
are maintained: 1/4in. (6.4 mm) clearance between the
roof curb and the base rail inside the front and rear, 0.0 in.
clearance between the roof curb and the base rail inside on
the duct end of the unit. This will result in the distance
between the roof curb and the base rail inside on the
condenser end of the unit being approximately equal to
Fig. 3, section C--C.
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
After unit is in position, remove the compressor access
panel. Holding the blocking between compressors with
one hand, cut the strapping. Carefully remove the
blocking without damaging tubing, wiring, or controls.
Remove the strapping and replace the access panel.
Remove all shipping materials and top skid. 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. To convert to horizontal
configuration, remove screws from side duct opening
covers and remove covers. Using the same screws, install
covers on vertical duct openings with the insulation--side
down. Seals around duct openings must be tight. See
Fig. 6.
C06108
Fig. 6 -- Horizontal Conversion Panels
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.
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. 7.)
3. Locate and cut the (2) plastic tie--wraps, being
careful to not damage any wiring. (See Fig. 8.)
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 10.
FILTER ACCESS PANEL
INDOOR COIL ACCESS PANEL
C06023
Fig. 7 -- Typical Access Panel Locations
Economizer
Cut Plastic Ties
(2) Places
Remove Hood Parts
C08633
Fig. 8 -- Economizer Wiring
548J***D

9
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. 7.)
3. Locate the (2) screws holding the metal tray to the
basepan and remove. Locate and cut the (2) plastic
tie--wraps securing the assembly to the damper. (See
Fig. 9.) 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 on page 10.
Hood Parts
Plastic Tie Wrap
Qty (2)
Screws for Metal Tray
Qty (2)
C08639
Fig. 9 -- Damper Assembly
548J***D

10
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. Remove the screws along the sides and bot-
tom of the indoor coil access panel. See Fig. 10.
SIDE
PANEL
INDOOR
COIL
ACCESS
PANEL
INDOOR
COIL
ACCESS
PANEL
CAULK
HERE
TOP
SIDE
PANEL
C06025
Fig. 10 -- Indoor Coil Access Panel Relocation
2. Swing out indoor coil access panel and insert the
hood sides under the panel (hood top). 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. 11.
B
TOP
PANEL
INDOOR COIL
ACCESS PANEL
19 1/16”
SCREW
HOOD DIVIDER
LEFT
HOOD
SIDE
33 3/8”
(848mm)
(483mm)
C06026
Fig. 11 -- Economizer Hood Construction
3. Remove the shipping tape holding the economizer ba-
rometric relief damper in place.
4. Insert the hood divider between the hood sides. See
Fig. 11 and 12. Secure hood divider with 2 screws on
each hood side. The hood divider is also used as the
bottom filter rack for the aluminum filter.
5. Open the filter clips which are located underneath the
hood top. Insert the aluminum filter into the bottom
filter rack (hood divider). Push the filter into position
past the open filter clips. Close the filter clips to lock
the filter into place. See Fig. 12.
DIVIDER
BAROMETRIC
RELIEF
CLEANABLE
ALUMINUM
FILTER FILTER
HOOD
FILTER
CLIP
OUTSIDE
AIR
C08634
Fig. 12 -- Economizer Filter Installation
6. Caulk the ends of the joint between the unit top panel
and the hood top.
7. 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. 13. 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. 13 -- 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. 14.
548J***D

11
NOTE: Trap should be deep enough to offset maximum unit static
difference. A 4” (102) 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
2˝(51) MIN
C08022
Fig. 14 -- 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.).
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 —
If equipped with optional Powered Convenience Outlet:
The power source leads to the convenience outlet’s
transformer primary are not factory connected. Installer
must connect these leads according to required operation
of the convenience outlet. If an always--energized
convenience outlet operation is desired, connect the
source leads to the line side of the unit--mounted
disconnect. (Check with local codes to ensure this method
is acceptable in your area.) If a de--energize via unit
disconnect switch operation of the convenience outlet is
desired, connect the source leads to the load side of the
unit disconnect. On a unit without a unit--mounted
disconnect, connect the source leads to compressor
contactor C and indoor fan contactor IFC pressure lugs
with unit field power leads.
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 208-v 1/4-in. male
terminal on the primary side of the transformer. Refer to
unit label diagram for additional information. Field power
wires will be connected line--side pressure lugs on the
power terminal block or at factory--installed option
non--fused disconnect.
Field power wires are connected to the unit at line--side
pressure lugs on compressor contactor C and indoor fan
contactor IFC or terminal board (see wiring diagram label
for control box component arrangement) or at
factory--installed option non--fused disconnect switch.
Max wire size is #2 AWG (copper only). (See Fig. 16)
NOTE: TEST LEADS -- Unit may be equipped with
short leads (pigtails) on the field line connection points on
contactor C or 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.
!WARNING
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. 15.)
COPPER
WIRE ONLY
ELECTRIC
DISCONNECT
SWITCH
ALUMINUM
WIRE
A93033
Fig. 15 -- Disconnect Switch and Unit
Units Without Factory--Installed Disconnect —
When installing units, provide a disconnect switch per
NEC (National Electrical Code) of adequate size.
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.
548J***D

12
Units with Factory--Installed 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. 16).
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
TB
C
IFC
(3 Phase
Indoor Motor)
(1 Phase Indoor Motor
and 1 Phase Unit)
208/230-1-60
208/230-3-60
460-3-60
575-3-60
Disconnect
per
NEC
C09011
Fig. 16 -- Power Wiring Connections
All units --
All field wiring must comply with NEC and all local
codes. Size wire based on MCA (Minimum Circuit Amps)
on the unit informative plate. See Fig. 16 and the unit
label diagram for power wiring connections to the unit
power terminal blocks and equipment ground. Maximum
wire size is #2 ga 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.
All field wiring must comply with the NEC and local
requirements.
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 on
548J***D models: 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. 17.
Convenience
Outlet
GFCI
Pwd-CO
Fuse
Switch
Pwd-CO
Transformer
Control Box
Access Panel
C08128
Fig. 17 -- Convenience Outlet Location
Installing Weatherproof Cover –
A weatherproof while-in-use cover for the
factory-installed convenience outlets is now required by
UL standards. This cover cannot be factory-mounted due
its depth; it must be installed at unit installation. For
shipment, the convenience outlet is covered with a blank
cover plate.
The weatherproof cover kit is shipped in the unit’s control
box. The kit includes the hinged cover, a backing plate
and gasket.
DISCONNECT ALL POWER TO UNIT AND
CONVENIENCE OUTLET.
Remove the blank cover plate at the convenience outlet;
discard the blank cover.
Loosen the two screws at the GFCI duplex outlet, until
approximately 1/2-in (13 mm) under screw heads are
exposed. Press the gasket over the screw heads. Slip the
backing plate over the screw heads at the keyhole slots
and align with the gasket; tighten the two screws until
snug (do not over-tighten).
548J***D

13
Mount the weatherproof cover to the backing plate as
shown in Fig. 18. Remove two slot fillers in the bottom of
the cover to permit service tool cords to exit the cover.
Check for full closing and latching.
RECEPTACLE
NOT INCLUDED
COVER – WHILE-IN-USE
WEATHERPROOF
BASE PLATE FOR
GFCI RECEPTACLE
C09022
Fig. 18 -- Weatherproof Cover Installation
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, 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.
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 unit’s control
box access panel. See Fig. 17.
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 or HACR breaker switch; this will provide
service power to the unit when the unit disconnect switch
or HACR switch is open. Other connection methods will
result in the convenience outlet circuit being de--energized
when the unit disconnect or HACR switch is open. See
Fig. 19.
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. 19 -- 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.
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.
Factory--Option Thru--Base Connections —
This service connection kit consists of a 1/2--in electrical
bulkhead connector and a 3/4--in electrical bulkhead
connector, all factory--installed in the embossed (raised)
section of the unit basepan in the condenser section. The
1/2--in bulkhead connector enables the low--voltage control
wires to pass through the basepan. The 3/4--in electrical
bulkhead connector allows the high--voltage power wires
to pass through the basepan. See Fig. 20.
Check tightness of connector lock nuts before connecting
electrical conduits.
548J***D

14
LOW VOLTAGE
CONDUIT
CONNECTOR
HIGH VOLTAGE
CONDUIT
CONNECTOR
C08637
Fig. 20 -- Thru--Base Connection Fittings
Field--supplied and field--installed liquidtight conduit
connectors and conduit may be attached to the connectors
on the basepan. Pull correctly rated high voltage and low
voltage through appropriate conduits. Connect the power
conduit to the internal disconnect (if unit is so equipped)
or to the external disconnect (through unit side panel). A
hole must be field cut in the main control box bottom on
the left side so the 24--v control connections can be made.
Connect the control power conduit to the unit control box
at this hole.
Units without Thru--Base Connections —
1. Install power wiring conduit through side panel open-
ings. Install conduit between disconnect and control
box.
2. Install power lines to terminal connections as shown
in Fig. 16.
All Units —
Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate. See
Table 5. On 3--phase units, voltages between phases must
be balanced within 2% and the current within 10%. Use
the formula shown in the legend for Table 5, Note 2 (see
page 32) to determine the percent of voltage imbalance.
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.
Field Control Wiring —
The 548J***D unit requires an external temperature
control device. This device can be a thermostat emulation
device provided as part of a third--party Building
Management System.
Thermostat —
Install a Bryant--approved accessory 2 stage
Cooling/Heating thermostat according to installation
instructions included with the accessory. The 548J***D
models do not require a thermostat with an O function to
control the reversing valve operation. If using an
electronic thermostat, configure it for “non--heat pump”
operation. Locate the thermostat accessory on a solid wall
in the conditioned space to sense average temperature in
accordance with the thermostat installation instructions.
If the thermostat contains a logic circuit requiring 24--v
power, use a thermostat cable or equivalent single leads of
different colors with minimum of seven leads. If the
thermostat does not require a 24--v source (no “C”
connection required), use a thermostat cable or equivalent
with minimum of six leads. Check the thermostat
installation instructions for additional features which
might require additional conductors in the cable.
For wire runs up to 50 ft. (15 m), use no. 18 AWG
(American Wire Gage) insulated wire (35_C minimum).
For50to75ft.(15to23m),useno.16AWGinsulated
wire (35_C minimum). For over 75 ft. (23 m), use no. 14
AWG insulated wire (35_C minimum). All wire sizes
larger than no. 18 AWG cannot be directly connected to
the thermostat and will require a junction box and splice
at the thermostat.
X
C
G
W2
C
W2
G
W1
O/B/Y2 Y2
R
W1
R
Y1 Y1
T
H
E
R
M
O
S
T
A
T
(Note 1)
(Note 2)
Note 1: Typical multi-function marking. Follow manufacturer’s configuration
instructions to select Y2. Do not configure for O output.
Note 2: W2 connection not required on units without electric heating.
Field Wiring
Central
Terminal
Board
Typical
Thermostat
Connections
C09012
Fig. 21 -- Typical Low--Voltage Control Connections
Unit without thru--base connection kit —
Pass the thermostat control wires through the hole
provided in the corner post; then feed the wires through
the raceway built into the corner post to the control box.
Pull the wires over to the terminal strip on the upper--left
corner of the Central Terminal Board (CTB). See Fig. 22.
NOTE: If thru--the--bottom connections accessory is
used, refer to the accessory installation instructions for
information on routing power and control wiring.
Heat Anticipator Settings —
Set heat anticipator settings at 0.14 amp for the first stage
and 0.14 amp for second--stage heating, when available.
548J***D

15
RACEWAY
HOLE IN END PANEL (HIDDEN)
C08027
Fig. 22 -- Field Control Wiring Raceway
Electric Heaters
548J***D units may be equipped with field--installed
accessory electric heaters. The heaters are modular in
design, with heater frames holding open coil resistance
wires strung through ceramic insulators, line--break limit
switches and a control contactor. One or two heater
modules may be used in a unit.
Heater modules are installed in the compartment below
the indoor (supply) fan outlet. Access is through the
indoor access panel. Heater modules slide into the
compartment on tracks along the bottom of the heater
opening. See Fig. 23, Fig. 24, and Fig. 25.
DISCONNECT MOUNTING
LOCATION
UNIT BLOCK-OFF
PANEL
OUTDOOR
ACCESS PANEL
INDOOR
ACCESS
PANEL
C08133
Fig. 23 -- Typical Access Panel Location
Not all available heater modules may be used in every
unit. Use only those heater modules that are UL listed for
use in a specific size unit. Refer to the label on the unit
cabinet for the list of approved heaters.
Unit heaters are marked with Heater Model Numbers. But
heaters are ordered as and shipped in cartons marked with
a corresponding heater Sales Package part number. See
Table 2 for correlation between heater Model Number and
Sales Package part number.
NOTE: The value in position 9 of the part number differs
between the sales package part number (value is 1 or 3)
and a bare heater model number (value is 0).
Table 2 – Heater Model Number
Bare Heater Model Number C R H E A T E R 0 0 1 A 0 0
Heater Sales Package PNO
Includes:
Bare Heater
Carton and packing materials
Installation sheet
C R H E A T E R 1 0 1 A 0 0
DISCONNECT
MOUNTING
LOCATION
EMT OR RIGID CONDUIT
(FIELD-SUPPLIED)
SINGLE
POINT BOX
CENTER
POST
HEATER
COVERS
HEATER
MOUNTING
BRACKET
HEATER
MODULE
(LOCATION 2)
HEATER
MODULE
(LOCATION 1)
SINGLE POINT
BOX
MOUNTING
SCREW
BRACKET AND
CONDUIT
DRIP BOOT
MAIN
CONTROL
BOX
CONTROL WIRE TERMINAL BLOCK
MANUAL RESET
LIMIT SWITCH
C08134
Fig. 24 -- Typical Component Location
548J***D

16
TRACK
FLANGE
C08135
Fig. 25 -- Typical Module Installation
Single Point Boxes and Supplementary Fuses — When
the unit MOCP device value exceeds 60--A, unit--mounted
supplementary fuses are required for each heater circuit.
These fuses are included in accessory Single Point Boxes,
with power distribution and fuse blocks. The single point
box will be installed directly under the unit control box,
just to the left of the partition separating the indoor
section (with electric heaters) from the outdoor section.
The Single Point Box has a hinged access cover. See
Fig. 26. The Single Point Box also includes pigtails to
complete the wiring between the Single Point Box and the
unit’s main control box terminals. Refer to the accessory
heater and Single Point Box installation instructions for
details on tap connections
ALLIEDPA
MODELNO.
ERIALNO.
CORP
.
11 13
21 23
OD
22.2
3
1
23
ISTEDAIR
NDITIONING
UIPACCESS
346N
.
P/N
2- 5610-4
REV
1113
2123
CONTROL
BOX
BUSHING
SINGLE
POINT BOX
MOUNTING
SCREWS
FOAM
BUSHING
DRIP BOOT
BRACKET
MOUNTING
SCREWS
HEATER
RELAYS
POWER
WIRES
HEATER
MOUNTING
SCREWS
C08136
Fig. 26 -- Typical Single Point Installation
All fuses on 548J***D units are 60--A. (Note that all
heaters are qualified for use with a 60--A fuse, regardless
of actual heater ampacity, so only 60--A fuses are
necessary.)
Single Point Boxes without Fuses — Refer to accessory
heater and Single Point Box installation instructions for
details on tap connections.
Low--Voltage Control Connections — Run the
low--voltage control leads from the heater module(s) --
VIO and BRN (two of each if two modules are installed;
identify for Module #1) -- to the 4--pole terminal board
TB4 located on the heater bulkhead to the left of Heater
#1. Connect the VIO leads from Heater #1 and Heater #2
to terminal TB4--1. Connect the BRN leads to terminal
TB4--3. See Fig. 27.
DEFROST
BOARD
ORN
BRN
Field
Connections
E-HEAT
P3-3
13
ORN BRN
VIO BRN BRN
VIO
TB4
VIO HR2
HR1
BRN
VIO BRN
Elec Htr
HR1: On Heater 1 in Position #1
HR2: On Heater 2 in Position #2 (if installed)
C09013
Fig. 27 -- Accessory Electric Heater Control Connections
548J***D

17
RTU--MP control system
The RTU--MP controller, see Fig. 28, provides expanded
stand--alone operation of the HVAC system plus
connection and control through communication with
several Building Automation Systems (BAS) through
popular third--party network systems. The available
network systems are BACnet MP/TP, Modbus and
Johnson J2. Communication with LonWorks is also
possible by adding an accessory interface card to the
RTU--MP. Selection of the communication protocol and
baud rate are made at on--board DIP switches.
The RTU--MP control is factory--mounted in the
548J***D unit’s main control box, to the left of the CTB.
See Fig. 29. Factory wiring is completed through
harnesses connected to the CTB. Field connections for
RTU--MP sensors will be made at the Phoenix connectors
on the RTU--MP board. The factory--installed RTU--MP
control includes the supply--air temperature (SAT) sensor.
The outdoor air temperature (OAT) sensor is included in
the FIOP/accessory EconoMi$ert2 package.
Refer to Table 3, RTU--MP Controller Inputs and Outputs
for locations of all connections to the RTU--MP board.
C07129
Fig. 28 -- RTU--MP Multi--Protocol Control Board
C08652
Fig. 29 -- 548J***D Control Box Component Locations
548J***D

18
C09025
Fig. 30 -- RTU--MP System Control Wiring Diagram
548J***D

19
Table 3 – RTU--MP Controller Inputs and Outputs
POINT NAME BACnet OBJECT
NAME TYPE OF I/O CONNECTION PIN NUMBERS
INPUTS
Space Temperature Sensor sptsens AI (10K Thermistor) J 2 0 --- 1 , 2
Supply Air Temperature sat AI (10K Thermistor) J2---1, 2
Local Outside Air Temperature Sensor oatsens AI (10K Thermistor) J2---3, 4
Space Temperature Offset Pot sptopot AI (100K Potentiometer) J 2 0 --- 3
Indoor Air Quality iaq A I ( 4 --- 2 0 m a ) J4---2, 3
Outdoor Air Quality oaq A I ( 4 --- 2 0 m a ) J4---5, 6
Safety Chain Feedback safety DI (24 VAC) J1---9
Compressor Safety compstat DI (24 VAC) J1---2
Fire Shutdown firedown DI (24 VAC) J 1 --- 1 0
Enthalpy Switch enthalpy DI (24 VAC) J2---6, 7
Humidistat Input Status humstat DI (24 VAC) J5---7, 8
CONFIGURABLE INPUTS*
Space Relative Humidity sprh A I ( 4 --- 2 0 m a ) J 4 --- 2 , 3 o r J 4 --- 5 , 6
Outside Air Relative Humidity oarh A I ( 4 --- 2 0 m a )
Supply Fan Status fanstat DI (24 VAC) J5--- 1,2 or J5---3,4 or
J5 5,6 or J5 ---7,8
Filter Status filtstat DI (24 VAC)
Remote Occupancy Input remocc DI (24 VAC)
OUTPUTS
Economizer Commanded Position econocmd 4---20ma J2---5
SupplyFanRelayState sf DO Relay (24VAC , 1A) J1---4
Compressor 1 Relay State comp_1 DO Relay (24VAC , 1A) J1---8
Compressor 2 Relay State comp_2 DO Relay (24VAC , 1A) J1---7
Heat Stage 1 Relay State heat_1 DO Relay (24VAC , 1A) J1---6
Heat Stage 2 Relay State heat_2 DO Relay (24VAC , 1A) J1---5
Power Exhaust Relay State aux_2 DO Relay (24VAC , 1A) J 1 1 --- 3
Dehumidification Relay State humizer DO Relay (24VAC, 1A) J 1 1 --- 7 , 8
LEGEND
AI --- A n a l o g I n p u t
AO --- A n a l o g O u t p u t
DI --- D i s c r e t e I n p u t
DO --- Discrete Output
* These inputs (if installed) take the place of the default input on the specific channel according to schematic.
P a r a l l e l p i n s J 5 --- 1 = J 2 --- 6 , J 5 --- 3 = J 1 --- 1 0 , J 5 --- 5 = J 1 --- 2 a r e u s e d f o r f i e l d --- i n s t a l l a t i o n .
The RTU--MP controller requires the use of a Bryant
space sensor. A standard thermostat cannot be used with
the RTU--MP system.
Supply Air Temperature (SAT) Sensor -- On
FIOP--equipped 548J***D unit, the unit is supplied with a
supply--air temperature (SAT) sensor (33ZCSENSAT).
This sensor is a tubular probe type, approx 6--inches
(12.7 mm) in length. It is a nominal 10--k ohm thermistor.
The SAT is factory--wired. The SAT probe is wire--tied to
the supply--air opening (on the horizontal opening end) in
its shipping position. Remove the sensor for installation.
Re--position the sensor in the flange of the supply--air
opening or in the supply air duct (as required by local
codes). Drill or punch a 1/2--in. hole in the flange or duct.
Use two field--supplied, self--drilling screws to secure the
sensor probe in a horizontal orientation. See Fig. 31.
SUPPLY AIR RETURN AIR
SUPPLY AIR
TEMPERATURE
SENSOR
ROOF
CURB
C08200
Fig. 31 -- Typical Mounting Location for Supply Air
Temperature (SAT) Sensor on Small Rooftop Units
548J***D

20
Outdoor Air Temperature (OAT) Sensor -- The OAT is
factory--mounted in the EconoMi$er2 (FIOP or
accessory). It is a nominal 10k ohm thermistor attached to
an eyelet mounting ring.
EconoMi$er2 -- The RTU--MP control is used with
EconoMi$er2 (option or accessory) for outdoor air
management. The damper position is controlled directly
by the RTU--MP control; EconoMi$er2 has no internal
logic device.
Outdoor air management functions can be enhanced with
field--installation of these accessory control devices:
Enthalpy control (outdoor air or differential sensors)
Space CO2sensor
Outdoor air CO2sensor
Field Connections -- Field connections for accessory
sensors and input devices are made the RTU--MP, at plugs
J1, J2, J4, J5, J11 and J20. All field control wiring that
connects to the RTU--MP must be routed through the
raceway built into the corner post as shown in Fig. 22.
The raceway provides the UL required clearance between
high-- and low--voltage wiring. Pass the control wires
through the hole provided in the corner post, then feed the
wires thorough the raceway to the RTU--MP. Connect to
the wires to the removable Phoenix connectors and then
reconnect the connectors to the board.
Space Temperature (SPT) Sensors
A field--supplied Bryant space temperature sensor is
required with the RTU--MP to monitor space temperature.
There are 3 sensors available for this application:
S33ZCT55SPT, space temperature sensor with override
button
S33ZCT56SPT, space temperature sensor with override
button and setpoint adjustment
S33ZCT59SPT, space temperature sensor with LCD
(liquid crystal display) screen, override button, and
setpoint adjustment
Use 20 gauge wire to connect the sensor to the controller.
The wire is suitable for distances of up to 500 ft. Use a
three--conductor shielded cable for the sensor and setpoint
adjustment connections. If the setpoint adjustment
(slidebar) is not required, then an unshielded, 18 or 20
gauge, two--conductor, twisted pair cable may be used.
Connect T--55 -- See Fig. 32 for typical T--55 internal
connections. Connect the T--55 SEN terminals to
RTU--MP J20--1 and J20--2. See Fig. 33.
2345 61
SW1
SEN
BRN (GND)
BLU (SPT)
RED(+)
WHT(GND)
BLK(-) CCN COM
SENSOR WIRING
C08201
Fig. 32 -- T--55 Space Temperature Sensor Wiring
SEN
SEN
J20-1
J20-2
C08460
Fig. 33 -- RTU--MP T--55 Sensor Connections
Connect T--56 -- See Fig. 34 for T--56 internal
connections. Install a jumper between SEN and SET
terminals as illustrated. Connect T--56 terminals to
RTU--MP J20--1, J20--2 and J20--3 per Fig. 35.
2345 61
SW1
SEN SET
Cool Warm
BRN (GND)
BLU (SPT)
RED(+)
WHT(GND)
BLK(-) CCN COM
SENSOR WIRING
JUMPER
TERMINALS
AS SHOWN
BLK
(T56)
C08202
Fig. 34 -- T--56 Internal Connections
548J***D