Bryant 548J*14D Series User manual

548J*14D
SINGLE PACKAGE ROOFTOP
HEAT PUMP
WITH WITH PURONR(R--410A) REFRIGERANT
SIZE 14
Installation Instructions
NOTE: Read the entire instruction manual before starting
the installation.
TABLE OF CONTENTS
SAFETY CONSIDERATIONS 1....................
INSTALLATION 4...............................
Jobsite Survey 4................................
Step 1 -- Plan for Unit Location 4..................
Roof Mount 5...............................
Step 2 -- Plan for Sequence of Unit Installation 5......
Curb--Mount Installation 5.....................
Pad--Mount Installation 5......................
Frame--Mount Installation 5....................
Step 3 -- Inspect Unit 5...........................
Step 4 -- Provide Unit Support 5...................
Roof Curb Mount 5..........................
Slab Mount (Horizontal Units Only) 5...........
Alternate Unit Support 5......................
Step 5 -- Field Fabricate Ductwork 7................
For Units with Accessory Electric Heaters 7......
Step 6 -- Rig and Place Unit 7.....................
Step 7 -- Convert to Horizontal & Connect Ductwork 8.
Step 8 -- Install Outside Air Hood 8................
Economizer Hood Removal and Setup 8.........
Two Position Damper Hood Removal and Setup 9..
Economizer Hood and Two--Position Hood 10.....
Step 9 -- Install External Condensate Trap and Line 10.
Step 10 -- Make Electrical Connections 11...........
Field Power Supply 11........................
Units without Factory--Installed Disconnect 13....
Units with Factory--Installed Disconnect 13.......
Convenience Outlets 13.......................
Factory--Option Thru--Base Connections 15.......
Units without Thru--Base Connections 15.........
Field Control Wiring 15.......................
Thermostat 15...............................
Unit without Thru--Base Conversion Kit 16.......
Heat Anticipator Settings 16...................
Electric Heaters 16..............................
Single Point Boxes 17..........................
Heater Low--Voltage Control Connections 17......
Outdoor Air Enthalpy Control 18.................
Differential Enthalpy Control 18................
Return Air Enthalpy Sensor 18.................
RTU--MP Control System 19......................
Supply Air Temperature (SAT) Sensor 21.........
Outdoor Air Temperature (OAT) Sensor 22.......
EconoMi$er2 22.............................
Field Connections 22..........................
Space Temperature (SPT) Sensors 22............
Economizer Controls 23......................
Indoor Air Quality (CO2)Sensor 23.............
Outdoor Air Quality Sensor 24.................
Connecting Discrete Inputs 24..................
Communication Wiring -- Protocols 25............
General 25.................................
Local Access 25.............................
RTU--MP Troubleshooting 25..................
Smoke Detectors 27.............................
System 27..................................
Controller 27...............................
Sensor 27..................................
Smoke Detector Locations 28....................
Supply Air 28...............................
Return Air without Economizer 28..............
Return Air with Economizer 28.................
Step 11 -- Adjust Factory--Installed Options 32........
Step 12 -- Install Accessories 33...................

2
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
!
548J*14D

3
Horizontal Connections / Economizer
Vertical Connections / Economizer
C09895
Fig. 1 -- Unit Dimensional Drawing – Size 14 Unit
548J*14D

4
C10364
Fig. 1 -- Unit Dimensional Drawing – Size 14 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 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. 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 , relief valves, or other sources of
contaminated air.
18”
(457)
*
42"
(1067)
*
Required bottom condensate drain connection.
Otherwise, 36” (914mm) for condensate connection.
42"
(1067)
42"
(1067)
C09897
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 during the heating--defrost mode as well as
allow installation of condensate trap per requirements.
RefertoStep9—InstallExternalCondensate Trap and
Line – for required trap dimensions.
548J*14D

5
Roof Mount —
Check building codes for weight distribution
requirements. Unit operating weight is shown in Table 1.
Table 1 – Operating Weights
548J*14D UNITS LB (KG)
Component 14D
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. 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. 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. 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.
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.
548J*14D

6
C10365
Fig. 3 -- Roof Curb Details
548J*14D

7
A-B
0.5” (13)
B-C
1.0” (25)
A-C
1.0” (25)
MAXIMUM ALLOWABLE
DIFFERENCE IN. (MM)
A
B
C
C10001
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 —
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 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.
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. SPREADER BARS REQUIRED — Top damage will occur if spreader bars are not used.
2. Dimensions in ( ) are in millimeters.
3. 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*14D

8
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. 6. Maintain the 15.5 in (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. 6 -- Retrofit Installation Dimensions
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 12.5 in (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. 16 -- 18. 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. 7 -- 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. 8.)
3. Locate and cut the (2) plastic tie--wraps, being careful
to not damage any wiring. (See Fig. 9.)
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
C10004
Fig. 8 -- Typical Access Panel Locations
548J*14D

9
Economizer
Cut Plastic Ties
(2) Places
Remove Hood Parts
C10005
Fig. 9 -- Economizer Wiring
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. 8.)
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. 10.) 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.
5. If removed, reattach the panel under the damper.
Hood Parts
Plastic Tie Wrap
Qty (2)
Screws for Metal Tray
Qty (2)
C10006
Fig. 10 -- Damper Assembly
548J*14D

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. If the panel is still attached to the unit, re-
move the screws along the sides and bottom of the
panel. See Fig. 11.
SIDE
PANEL
INDOOR
COIL
ACCESS
PANEL
INDOOR
COIL
ACCESS
PANEL
CAULK
HERE
TOP
PANEL
RAIN DEFLECTORS
C10007
Fig. 11 -- 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. 12.
TOP
PANEL
INDOOR COIL
ACCESS PANEL
SCREW
HOOD DIVIDER
LEFT
HOOD
SIDE
C10008
Fig. 12 -- 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. 12 and 13. 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. 13.
7. Install the two rain deflectors on the edge of the hood
topasshowninFig.11.
DIVIDER
BAROMETRIC
RELIEF
CLEANABLE
ALUMINUM
FILTER
FILTER
HOOD
FILTER
CLIP
OUTSIDE
AIR
C10009
Fig. 13 -- Economizer Filter Installation
8. Caulk the ends of the joint between the unit top panel
and the hood top as shown in Fig. 11.
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. 14. 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. 14 -- Condensate Drain Pan (Side View)
548J*14D

11
The piping for the condensate drain and external trap can
be completed after the unit is in place. See Fig. 15.
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. 15 -- 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 —
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” conduit is provided behind the access panel
located under the control box. For those units that require
conduit larger than 1”, it must be field supplied. Figures
16, 17 and 18 show the various wire routings.
C10010
Fig. 16 -- Conduit into Factory Option Disconnect
C10011
Fig. 17 -- Conduit into Control Box
C10012
Fig. 18 -- Conduit into Single Point Box
If the field disconnect is larger than 100A, it must be
attached to the unit using accessory CRDISBKT001A00
(see Fig. 19). Follow the instructions provided with this
accessory. For smaller field disconnects, be sure to use
1/2” screws to mount the disconnect directly to the end
panel (see Fig. 20). In either case, set the disconnect
vertical location on the unit so that a 90_fitting can be
used to connect the conduit to the disconnect.
548J*14D

12
C10014
Fig. 19 -- Mounting Position for Field Disconnects
(over 100A)
C10013
Fig. 20 -- 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. 22)
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. 21.)
!WARNING
COPPER
WIRE ONLY
ELECTRIC
DISCONNECT
SWITCH
ALUMINUM
WIRE
A93033
Fig. 21 -- Disconnect Switch and Unit
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. 22 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.
Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate. See
Table 4. 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 4 (see Note 2
on page 32) to determine the percent of voltage
imbalance.
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
!
548J*14D

13
Units Without Factory--Installed 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 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. 22). The factory disconnect is
an 80A disconnect.
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. 22 -- Power Wiring Connections
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*14D
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 panel beneath the control box. See
Fig. 23.
Convenience
Outlet
GFCI
Pwd-CO
Fuse
Switch
Pwd-CO
Transformer
Disconnect
Access Panel
C10361
Fig. 23 -- Convenience Outlet Location
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.
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. 23.
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. 24. 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 wire 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 o
548J*14D

14
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” 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. 24 -- 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
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).
Mount the weatherproof cover to the backing plate as
shown in Fig. 25. 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. 25 -- Weatherproof Cover Installation
548J*14D

15
Factory--Option Thru--Base Connections —
This service connection kit consists of a 1/2--in electrical
bulkhead connector and a 1 1/2--in electrical bulkhead
connector, all factory--installed to the basepan cover plate.
Remove the cover plate from the shipping bracket and
attach to basepan with 8 screws provided. The 1/2-- i n
bulkhead connector enables the low--voltage control wires
to pass through the basepan. The 1 1/2--in electrical
bulkhead connector allows the high--voltage power wires
to pass through the basepan. See Fig. 26.
Check tightness of connector lock nuts before connecting
electrical conduits.
LOW VOLTAGE
CONDUIT
CONNECTOR
HIGH VOLTAGE
CONDUIT
CONNECTOR
C10017
Fig. 26 -- 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 wires 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). Remove one of the two knockouts located on the
bottom left side of the unit control box. Use this hole for
the control conduit.
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. 22.
Field Control Wiring —
The 548J*14D 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*14D
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. 27 -- Typical Low--Voltage Control Connections
548J*14D

16
Unit without Thru--Base Connection Kit —
Pass the thermostat control wires through the bushing on
the unit end panel. Route the wire through the snap--in
wire tie and up to the web bushing near the control box.
Route the wire through the bushing and into the bottom
left side of the control box after removing one of the two
knockouts in the corner of the box. Using a connector at
the control box to protect the wire as it passes into the
control box. Pull the wires over to the terminal strip at the
upper left corner of the Central Terminal Board (CTB).
Use the connector at the control box and the wire tie to
ensure that the thermostat wire is tight and will not be
damaged by contact with the condenser coil. See Fig. 28.
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.
C10018
Fig. 28 -- Thermostat Wire Routing
Electric Heaters
548J*14D 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. 29.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage.
Not all available heater modules and single point
boxes 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 and single point boxes.
CAUTION
!
548J*14D

17
HEATER
MOUNTING
BRACKET
HEATER
MODULE
(LOCATION 2)
HEATER
MODULE
(LOCATION 1)
SINGLE POINT
BOX
MOUNTING
SCREW
SINGLE
POINT BOX
HEATER
COVERS
MANUAL RESET
LIMIT SWITCH
DISCONNECT
MOUNTING
LOCATION
C10029
Fig. 29 -- Typical Component Location
Single Point Boxes
When heaters are installed, power wiring to both heaters
and the rest of the unit is connected via the single point
box accessory, which 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. 29. 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. 30 -- Typical Single Point Installation
Heater 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.
All fuses on 548J 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.)
Heater Low--Voltage Control Connections —
One or two heaters can be installed in the unit. Use the
wiring procedure listed below for each heater as
determined by the number of stages in the heater.
Single Stage Heaters: Single--stage heaters will have an
orange and a brown control wire. Connect these to the
orange and brown wires located on TB4.
Two Stage Heaters: Two--stage heaters will have orange,
purple, red and brown wires. The orange and the purple
are the control wires and the red and brown wires feed the
safety circuit. Connect both the orange and the purple
wires to the orange wire locations of TB4. Connect the
red and brown wires to red and brown wires on TB4. If
more than one heater is installed, repeat the wiring
procedure for the second heater. The 3 locations across
the top of TB4 do allow a switch to be installed in series
with some of the heaters in order to add additional heater
control.
548J*14D

18
NOTE:
Optional Outdoor Temperature Control
at One Heater Stage –
Move either heater wire to this terminal
and connect outdoor temperature switch
between 2nd and 3rd terminals.
C10354
Fig. 31 -- Accessory Electric Heater Control Connections
Outdoor Air Enthalpy Control
(PNO 33CSENTHSW)
The enthalpy control (33CSENTHSW) is available as a
field--installed accessory to be used with the EconoMi$er2
damper system. The outdoor air enthalpy sensor is part of
the enthalpy control. (The separate field--installed
accessory return air enthalpy sensor (33CSENTSEN) is
required for differential enthalpy control. See Fig. 32.)
Locate the enthalpy control in the economizer next to the
Actuator Motor. Locate two GRA leads in the factory
harness and connect the gray lead labeled “ESL” to the
terminal labeled “LOW”. See Fig. 32. Connect the
enthalpy control power input terminals to economizer
actuator power leads RED (connect to 24V) and BLK
(connect to GND).
The outdoor enthalpy changeover setpoint is set at the
enthalpy controller.
Differential Enthalpy Control —
Differential enthalpy control is provided by sensing and
comparing the outside air and return air enthalpy
conditions. Install the outdoor air enthalpy control as
described above. Add and install a return air enthalpy
sensor.
Return Air Enthalpy Sensor —
Mount the return--air enthalpy sensor (33CSENTSEN) in
the return--air section of the economizer. The return air
sensor is wired to the enthalpy controller
(33CSENTHSW). See Fig. 32.
– 4-20 mA
In
+VDC
Out
– 4-20 mA
Out
+24-36
VDC In
7
ESL
CTB
ECON
LOW
GND
24V
Enthalpy
Switch
Return Air
Enthalpy Sensor
GRA
BLK
RED
Factory
Wiring
Harness
ECONO
MOTOR
B
L
K
R
E
D
C10282
Fig. 32 -- Outside and Return Air Enthalpy Sensor
Wiring
548J*14D

19
RTU--MP Control System
The RTU--MP controller, see Fig. 33, 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*14D unit’s main control box, to the left of the CTB.
See Fig. 34. 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 2, RTU--MP Controller Inputs and Outputs
for locations of all connections to the RTU--MP board.
C07129
Fig. 33 -- RTU--MP Multi--Protocol Control Board
C10024
Fig. 34 -- 548J*14D Control Box Component Locations
548J*14D

20
C10322
Fig. 35 -- RTU--MP System Control Wiring Diagram
548J*14D