Instruction manual | Bryant 548J*14D Heat Pump 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
Unit without Thru-- Base Conversion Kit . . . . . . . 16
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Heat Anticipator Settings . . . . . . . . . . . . . . . . . . . 16
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
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
SAFETY CONSIDERATIONS
!
548J*14D
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.
WARNING
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.
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.
!
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.
It is important to recognize safety information. This is the
. When you see this symbol on the
safety-- alert symbol
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.
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.
!
CAUTION
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.
2
548J*14D
Vertical Connections / Economizer
Horizontal Connections / Economizer
Fig. 1 - Unit Dimensional Drawing – Size 14 Unit
3
C09895
548J*14D
C10364
Fig. 1 - Unit Dimensional Drawing – Size 14 Unit (cont.)
INSTALLATION
Jobsite Survey
18”
(457) *
Complete the following checks before installation.
1. Consult local building codes and the NEC (National
Electrical Code) ANSI/NFPA 70 for special installation 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.
42"
(1067)
42"
(1067)
42"
(1067)
* Required bottom condensate drain connection.
Otherwise, 36” (914mm) for condensate connection.
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.
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.
Refer to Step 9 — Install External Condensate Trap and
Line – for required trap dimensions.
4
Roof Mount —
Frame-- mounted installation —
Frame-- mounted applications generally follow the
sequence for a curb installation. Adapt as required to
suit specific installation plan.
Check building codes for weight distribution
requirements. Unit operating weight is shown in Table 1.
548J*14D
Component
Base Unit
UNITS LB (KG)
14D
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
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.
5
548J*14D
Table 1 – Operating Weights
548J*14D
Fig. 3 - Roof Curb Details
6
C10365
CAUTION
!
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.
C
MAXIMUM ALLOWABLE
DIFFERENCE IN. (MM)
B
A-B
0.5” (13)
B-C
1.0” (25)
A-C
1.0” (25)
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.
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.
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.
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.
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.
CAUTION
!
Before setting the unit onto the curb, recheck gasketing on
curb.
PLACE ALL GASKET IN PLACE BEFORE PLACING
UNIT ON ROOF CURB.
914 - 1371
( 36” - 54” )
“B”
“C”
DETAIL “A”
“A”
DUCT END
SEE DETAIL “A”
C10281
UNIT
548J*14D
NOTES:
DIMENSIONS
MAX WEIGHT
A
B
C
LB
KG
IN
MM
IN
MM
IN
MM
2015
916
116.0
2945
55.5
1410
59.5
1510
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
7
548J*14D
A
Positioning on Curb —
548J*14D
For full perimeter curbs CRRFCURB072A00 and
073A00, the clearance between the roof curb and the front
and rear base rails should be 1/4 in (6.4 mm). The
clearance between the curb and the end base rails should
be 1/2 in (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 5/8 in (220 mm) clearances and allow the
22 5/16 in (567 mm) dimension to float if necessary.
Fig. 7 - Horizontal Conversion Panels
Fig. 6 - Retrofit Installation Dimensions
C10003
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.
C06108
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.
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.
FILTER ACCESS PANEL
INDOOR COIL ACCESS PANEL
Do not cover or obscure visibility to the unit’s informative
data plate when insulating horizontal ductwork.
Fig. 8 - Typical Access Panel Locations
8
C10004
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.
Remove Hood Parts
Cut Plastic Ties
(2) Places
Economizer
Fig. 9 - Economizer Wiring
C10005
Hood Parts
Plastic Tie Wrap
Qty (2)
Screws for Metal Tray
Qty (2)
Fig. 10 - Damper Assembly
9
C10006
548J*14D
Two Position Damper Hood Removal and Setup Factory Option —
Economizer Hood and Two-- Position Hood —
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
top as shown in Fig. 11.
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, remove the screws along the sides and bottom of the
panel. See Fig. 11.
SIDE
PANEL
DIVIDER
OUTSIDE
AIR
548J*14D
RAIN DEFLECTORS
HOOD
CLEANABLE
ALUMINUM
FILTER
TOP
PANEL
CAULK
HERE
INDOOR
COIL
ACCESS
PANEL
INDOOR
COIL
ACCESS
PANEL
BAROMETRIC
RELIEF
C10007
TOP
PANEL
INDOOR COIL
ACCESS PANEL
FILTER
CLIP
Fig. 13 - Economizer Filter Installation
C10009
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.
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.
FILTER
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 - in.
square socket drive extension) and install it in the side
drain connection.
SCREW
LEFT
HOOD
SIDE
HOOD DIVIDER
Fig. 12 - Economizer Hood Construction
C10008
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.
CONDENSATE PAN (SIDE VIEW)
STANDARD
DRAIN PLUG
SIDE DRAIN
(FACTORY-INSTALLED)
ALTERNATE
BOTTOM DRAIN
Fig. 14 - Condensate Drain Pan (Side View)
10
C08021
The piping for the condensate drain and external trap can
be completed after the unit is in place. See Fig. 15.
MINIMUM PITCH
1” (25mm) PER
10’ (3m) OF LINE
BASE RAIL
OPEN
VENT
2˝ (51) MIN
TO ROOF
DRAIN
SEE NOTE
DRAIN PLUG
ROOF
CURB
C10010
Fig. 16 - Conduit into Factory Option Disconnect
Fig. 15 - Condensate Drain Piping Details
548J*14D
NOTE: Trap should be deep enough to offset maximum unit static
difference. A 4” (102) trap is recommended
.
C08022
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
!
WARNING
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.
Fig. 17 - Conduit into Control Box
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.
Fig. 18 - Conduit into Single Point Box
C10011
C10012
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/ ” screws to mount the disconnect directly to the end
2
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.
11
Make field power connections directly to line connection
pressure lugs only.
!
WARNING
FIRE HAZARD
548J*14D
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.)
C10014
Fig. 19 - Mounting Position for Field Disconnects
(over 100A)
ELECTRIC
DISCONNECT
SWITCH
COPPER
WIRE ONLY
ALUMINUM
WIRE
Fig. 21 - Disconnect Switch and Unit
A93033
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.
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.
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.
!
CAUTION
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.
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.
12
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.
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.
Pwd-CO
Fuse
Switch
Units with Factory-- Installed Disconnect —
548J*14D
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
TB1
11
13
Convenience
Outlet
GFCI
13
Pwd-CO
Transformer
Disconnect
Access Panel
Disconnect
per
NEC
L1
L2
Fig. 23 - Convenience Outlet Location
L3
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.
208/230-3-60
460-3-60
575-3-60
Units With Disconnect Option
L1
2
L2
4
L3
6
1
Optional
Disconnect
Switch
3
Factory
Wiring
5
Disconnect factory test leads; discard.
Fig. 22 - Power Wiring Connections
C10015
Convenience Outlets —
!
C10361
WARNING
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.
Two types of convenience outlets are offered on 548J*14D
models: non--powered and unit--powered. Both types provide
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
13
the transformer; however, the conduit must be routed so
that all wiring is either in the conduit or behind the access
panel.
!
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.
548J*14D
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.
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
CONVENIENCE OUTLET.
TO
UNIT
AND
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.
COVER – WHILE-IN-USE
WEATHERPROOF
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
RECEPTACLE
NOT INCLUDED
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.
BASE PLATE FOR
GFCI RECEPTACLE
Fig. 25 - Weatherproof Cover Installation
14
C09022
Thermostat —
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 - in
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.
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.
Check tightness of connector lock nuts before connecting
electrical conduits.
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.
LOW VOLTAGE
CONDUIT
CONNECTOR
For wire runs up to 50 ft. (15 m), use no. 18 AWG
(American Wire Gage) insulated wire (35_C minimum).
For 50 to 75 ft. (15 to 23 m), use no. 16 AWG insulated
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.
HIGH VOLTAGE
CONDUIT
CONNECTOR
Fig. 26 - Thru-- Base Connection Fittings
Typical
Thermostat
Connections
C10017
X
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.
Field Control Wiring —
C
C
G
G
W2
Units without Thru-- Base Connections —
1. Install power wiring conduit through side panel openings. Install conduit between disconnect and control
box.
2. Install power lines to terminal connections as shown
in Fig. 22.
Central
Terminal
Board
W2
(Note 2)
W1
W1
O/B/Y2
Y2
(Note 1)
Y1
Y1
R
R
T
H
E
R
M
O
S
T
A
T
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
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.
C09012
Fig. 27 - Typical Low-- Voltage Control Connections
15
548J*14D
Factory-- Option Thru-- Base Connections —
548J*14D
Unit without Thru-- Base Connection Kit —
Electric Heaters
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.
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.
!
NOTE: If thru-- the-- bottom connections accessory is
used, refer to the accessory installation instructions for
information on routing power and control wiring.
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.
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.
Fig. 28 - Thermostat Wire Routing
CAUTION
C10018
16
SINGLE
POINT BOX
HEATER
COVERS
MANUAL RESET
LIMIT SWITCH
SINGLE POINT
BOX
MOUNTING
SCREW
HEATER
MODULE
(LOCATION 1)
HEATER
MODULE
(LOCATION 2)
548J*14D
DISCONNECT
MOUNTING
LOCATION
HEATER
MOUNTING
BRACKET
Fig. 29 - Typical Component Location
C10029
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.
21
11
23
13
CONTROL
BOX
BUSHING
SINGLE
POINT BOX
MOUNTING
SCREWS
DRIP BOOT
BRACKET
MOUNTING
SCREWS
POWER
WIRES
21
23
11
13
FOAM
BUSHING
ALLIED PA
CORP.
MODEL NO.
OD
ERIAL NO.
22.2
ISTED AIR
NDITIONING
UIP ACCESS
346N
23
.
P/N
2-
1
3
5610-4
REV
HEATER
RELAYS
HEATER
MOUNTING
SCREWS
Fig. 30 - Typical Single Point Installation
C08136
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.
17
NOTE:
548J*14D
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).
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.
Enthalpy
Switch
– 4-20 mA
In
24V
RED
GND
BLK
LOW
GRA
ECONO
MOTOR
+ VDC
Out
B
L
K
R
E
D
Return Air
Enthalpy Sensor
ESL
7
CTB
ECON
Factory
Wiring
Harness
+ 24-36
VDC In
The outdoor enthalpy changeover setpoint is set at the
enthalpy controller.
– 4-20 mA
Out
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.
C10282
Fig. 32 - Outside and Return Air Enthalpy Sensor
Wiring
18
RTU--MP Control System
Refer to Table 2, RTU-- MP Controller Inputs and Outputs
for locations of all connections to the RTU-- MP board.
548J*14D
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.
Fig. 33 - RTU-- MP Multi-- Protocol Control Board
Fig. 34 - 548J*14D Control Box Component Locations
19
C07129
C10024
548J*14D
Fig. 35 - RTU-- MP System Control Wiring Diagram
20
C10322
Table 2 – RTU-- MP Controller Inputs and Outputs
POINT NAME
BACnet OBJECT
NAME
TYPE OF I/O
CONNECTION PIN
NUMBERS
sptsens
AI (10K Thermistor)
J20---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)
J20---3
Indoor Air Quality
iaq
AI (4---20 ma)
J4---2, 3
Outdoor Air Quality
oaq
AI (4---20 ma)
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)
J1---10
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
AI (4---20 ma)
Outside Air Relative Humidity
oarh
AI (4---20 ma)
Supply Fan Status
fanstat
DI (24 VAC)
Filter Status
filtstat
DI (24 VAC)
remocc
DI (24 VAC)
Remote Occupancy Input
J4---2,3 or J4---5,6
J5---1,2 or J5---3,4 or
J5 5,6 or J5---7,8
OUTPUTS
Economizer Commanded Position
econocmd
4---20ma
J2---5
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)
J11---3
humizer
DO Relay (24VAC, 1A)
J11---7, 8
Supply Fan Relay State
Dehumidification Relay State
LEGEND
AI --- Analog Input
AO --- Analog Output
DI --- Discrete Input
DO --- Discrete Output
* These inputs (if installed) take the place of the default input on the specific channel according to schematic.
Parallel pins J5--- 1 = J2--- 6, J5--- 3 = J1--- 10, J5--- 5 = J1--- 2 are used for field --- installation.
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*14D 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.
SUPPLY AIR
TEMPERATURE
SENSOR
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. 36.
SUPPLY AIR
RETURN AIR
ROOF
CURB
C10020
Fig. 36 - Typical Mounting Location for Supply Air
Temperature (SAT) Sensor on Small Rooftop Units
21
548J*14D
INPUTS
Space Temperature Sensor
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.
1
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.
2
3
4
5
6
RED(+)
WHT(GND)
BLK(-)
CCN COM
SEN
SW1
BRN (GND)
BLU (SPT)
SENSOR WIRING
548J*14D
Outdoor air management functions can be enhanced with
field-- installation of these accessory control devices:
Enthalpy control (outdoor air or differential sensors)
Space CO2 sensor
Outdoor air CO2 sensor
C08201
Fig. 37 - T-- 55 Space Temperature Sensor Wiring
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 as shown in Fig. 28. This routing provides
the UL required clearance between high-- and low-- voltage
wiring. Connect to the wires to the removable Phoenix
connectors and then reconnect the connectors to the board.
S 33ZCT55SPT, space temperature sensor with override
button
J20-1
SEN
J20-2
Fig. 38 - RTU-- MP T-- 55 Sensor Connections
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:
SEN
C08460
Connect T-- 56: See Fig. 39 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. 40.
S 33ZCT56SPT, space temperature sensor with override
button and setpoint adjustment
S 33ZCT59SPT, space temperature sensor with LCD
(liquid crystal display) screen, override button, and
setpoint adjustment
1
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.
2
3
4
SEN
SW1
5
6
RED(+)
WHT(GND)
BLK(-)
CCN COM
SET
BLK
(T56)
BRN (GND)
BLU (SPT)
SENSOR WIRING
JUMPER
TERMINALS
AS SHOWN
Connect T-- 55: See Fig. 37 for typical T-- 55 internal
connections. Connect the T-- 55 SEN terminals to
RTU-- MP J20-- 1 and J20-- 2. See Fig. 38.
Cool
Warm
Fig. 39 - T-- 56 Internal Connections
22
C08202
Indoor Air Quality (CO2 sensor) —
J20-1
SEN
The indoor air quality sensor accessory monitors space
carbon dioxide (CO2) levels. This information is used to
monitor IAQ levels. Several types of sensors are available,
for wall mounting in the space or in return duct, with and
without LCD display, and in combination with space
temperature sensors. Sensors use infrared technology to
measure the levels of CO2 present in the space air.
J20-2
Jumper
SET
SET
J20-3
Fig. 40 - RTU-- MP T-- 56 Sensor Connections
C08461
Connect T-- 59: The T-- 59 space sensor requires a
separate, isolated power supply of 24 VAC. See Fig. 41
for internal connections at the T-- 59. Connect the SEN
terminal (BLU) to RTU-- MP J20-- 1. Connect the COM
terminal (BRN) to J20-- 2. Connect the SET terminal (STO
or BLK) to J20-- 3.
BLK (STO)
BRN (COM)
BLU (SPT)
OR
SET
The CO2 sensors are all factory set for a range of 0 to
2000 ppm and a linear mA output of 4 to 20. Refer to the
instructions supplied with the CO2 sensor for electrical
requirements and terminal locations. See Fig. 42 for
typical CO2 sensor wiring schematic.
548J*14D
SEN
J20-3
J20-2
SENSOR
WIRING
+ 0-10VDC
- SIG COM
+ 4-20mA
J20-1
ALARM
NC
COM RELAY
NO CONTACTS
}
SEN
H G 24 VAC
OR
+ - 24 VDC
OPB
COM- PWR+
24 VAC
2 1
J3
8765432 1
J4
POWER
WIRING
C08635
Fig. 42 - Indoor/Outdoor Air Quality (CO2) Sensor
(33ZCSENCO2) - Typical Wiring Diagram
NOTE: Must use a separate isolated transformer.
C10291
Fig. 41 - Space Temperature Sensor Typical Wiring
(33ZCT59SPT)
Economizer Controls —
To wire the return air enthalpy sensor, perform the
following:
1. Use a 2-- conductor, 18 or 20 AWG, twisted pair cable
to connect the return air enthalpy sensor to the enthalpy controller.
2. Connect the field-- supplied RED wire to (+) spade
connector on the return air enthalpy sensor and the
(+) terminal on the enthalpy controller. Connect the
BLK wire to (-- ) spade connector on the return air enthalpy sensor and the (-- ) terminal on the enthalpy
controller.
To accurately monitor the quality of the air in the
conditioned air space, locate the sensor near a return-- air
grille (if present) so it senses the concentration of CO2
leaving the space. The sensor should be mounted in a
location to avoid direct breath contact.
Do not mount the IAQ sensor in drafty areas such as near
supply ducts, open windows, fans, or over heat sources.
Allow at least 3 ft (0.9 m) between the sensor and any
corner. Avoid mounting the sensor where it is influenced
by the supply air; the sensor gives inaccurate readings if
the supply air is blown directly onto the sensor or if the
supply air does not have a chance to mix with the room air
before it is drawn into the return airstream.
Wiring the Indoor Air Quality Sensor: For each sensor,
use two 2-- conductor 18 AWG (American Wire Gage)
twisted-- pair cables (unshielded) to connect the separate
isolated 24 vac power source to the sensor and to connect
the sensor to the control board terminals.
23
To connect the sensor to the control, identify the positive
(4 to 20 mA) and ground (SIG COM) terminals on the
sensor. See Fig. 42. Connect the 4-- 20 mA terminal to
RTU-- MP J4-- 2 and connect the SIG COM terminal to
RTU-- MP J4-- 3. See Fig. 43.
OAQ Sensor/RH Sensor
IAQ Sensor
SEN
J4-5
COM
J4-6
24 VAC
J4-2
SEN
COM
J4-3
24 VAC
548J*14D
Fig. 43 - RTU-- MP / Indoor CO2 Sensor
(33ZCSENCO2) Connections
C08462
Outdoor Air Quality Sensor (PNO 33ZCSENCO2 plus
weatherproof enclosure) —
The outdoor air CO2 sensor is designed to monitor carbon
dioxide (CO2) levels in the outside ventilation air and
interface with the ventilation damper in an HVAC system.
The OAQ sensor is packaged with an outdoor cover. See
Fig. 44. The outdoor air CO2 sensor must be located in the
economizer outside air hood.
COVER REMOVED
Fig. 45 - RTU-- MP / Outdoor CO2 Sensor
(33ZCSENCO2) Connections
SIDE VIEW
Fig. 44 - Outdoor Air Quality Sensor Cover
C07135
Wiring the Outdoor Air CO2 Sensor: A dedicated
power supply is required for this sensor. A two-- wire cable
is required to wire the dedicated power supply for the
sensor. The two wires should be connected to the power
supply and terminals 1 and 2.
To connect the sensor to the control, identify the positive
(4 to 20 mA) and ground (SIG COM) terminals on the
OAQ sensor. See Fig. 42. Connect the 4 to 20 mA
terminal to RTU-- MP J4-- 5. Connect the SIG COM
terminal to RTU-- MP J4-- 6. See Fig. 45.
C08463
On 548J*14D units equipped with factory--installed Smoke
Detector(s), the smoke detector controller implements the
unit shutdown through its NC contact set connected to the
unit’s CTB input. The FSD function is initiated via the
smoke detector’s Alarm NO contact set. The RTU--MP
controller communicates the smoke detector’s tripped status
to the BAS building control. See Fig. 35, RTU--MP System
Control wiring schematic.
The
Fire
Shutdown
Switch
configuration,
MENU→Config→Inputs→input 5, identifies the normally
open status of this input when there is no fire alarm.
Connecting Discrete Inputs —
Filter Status: The filter status accessory is a
field-- installed accessory. This accessory detects plugged
filters. When installing this accessory, the unit must be
configured
for
filter
status
by
setting
MENU→Config→Inputs→input 3, 5, 8, or 9 to Filter
Status and normally open (N/O) or normally closed (N/C).
Input 8 or 9 is recommended for easy of installation. Refer
to Fig. 33 and Fig. 35 for wire terminations at J5.
Fan Status: The fan status accessory is a field--installed
accessory. This accessory detects when the indoor fan is
blowing air. When installing this accessory, the unit must be
configured
for
fan
status
by
setting
MENU→Config→Inputs→input 3, 5, 8, or 9 to Fan Status
and normally open (N/O) or normally closed (N/C). Input 8
or 9 is recommended for easy of installation. Refer to
Fig. 33 and Fig. 35 for wire terminations at J5.
Remote Occupancy: The remote occupancy accessory
is a field-- installed accessory. This accessory overrides the
unoccupied mode and puts the unit in occupied mode.
When installing this accessory, the unit must be
configured for
remote occupancy
by setting
MENU→Config→Inputs→input 3, 5, 8, or 9 to Remote
Occupancy and normally open (N/O) or normally closed
(N/C).
Also set MENU→Schedules→occupancy source to DI
on/off. Input 8 or 9 is recommended for easy of
installation. Refer to Fig. 33 and Table 2 for wire
terminations at J5.
24
Power Exhaust
PEC
GRA
J11-3
CTB
THERMOSTAT
C
TAN
C10362
Fig. 46 - RTU-- MP Power Exhaust Connections
Space Relative Humidity Sensor - The RH sensor is not
used with 548J*14D models at this time.
Communication Wiring -- Protocols
General —
Protocols are the communication languages spoken by
control devices. The main purpose of a protocol is to
communicate information in the most efficient method
possible. Different protocols exist to provide different
kinds of information for different applications. In the BAS
application, many different protocols are used, depending
on manufacturer. Protocols do not change the function of
a controller; just make the front end user different.
The RTU-- MP can be set to communicate on four different
protocols: BACnet, Modbus, N2, and LonWorks. Switch 3
(SW3) on the board is used to set protocol and baud rate.
Switches 1 and 2 (SW1 and SW2) are used to set the
board’s network address. See Fig. 47 for the switch setting
per protocol. The 3rd party connection to the RTU-- MP is
through plug J19.
NOTE: Power must be cycled after changing the SW1-- 3
switch settings.
Refer to the RTU-- MP 3rd Party Integration Guide for
more detailed information on protocols, 3rd party wiring,
and networking.
Local Access —
BACview6 Handheld: The BACview6 is a keypad/display
interface used to connect to the RTU-- MP to access the
control information, read sensor values, and test the RTU,
see Fig. 48. This is an accessory interface that does not
come with the MP controller and can only be used at the
unit. Connect the BACview6 to the RTU-- MP’s J12 local
access port. There are 2 password protected levels in the
display (User and Admin). The user password is defaulted
to 0000 but can be changed. The Admin password is 1111
and cannot be changed. There is a 10 minute auto logout
if a screen is idle. Contact your Bryant applications
engineer for details on navigation and screen content.
Virtual BACview: Virtual BACview is a freeware computer
program that functions as the BACview6 Handheld. The
USB Link interface (USB-- L) is required to connect a
computer to the RTU-- MP board. The link cable connects
a USB port to the J12 local access port. This program
functions and operates identical to the handheld.
RTU-- MP Troubleshooting —
Communication LEDs The LEDs indicate if the
controller is speaking to the devices on the network. The
LEDs should reflect communication traffic based on the
baud rate set. The higher the baud rate the more solid the
LEDs will appear.
SW3 Protocol Selection
PROTOCOL
DS8
DS7
DS6
DS5
DS4
DS3
DS2
DS1
BACnet MS/TP
(Master)
Unused
OFF
OFF
OFF
ON
OFF
Select Baud
Select Baud
Modbus
(Slave)
Unused
OFF
OFF
ON
ON
OFF
Select Baud
Select Baud
N2
(Slave)
Unused
OFF
OFF
OFF
ON
ON
OFF
OFF
LonWorks
Unused
ON
ON
OFF
ON
OFF
OFF
OFF
NOTE:
DS = Dip Switch
BACnet MS/TP SW3 example shown
Baud Rate Selections
BAUD RATE
DS2
DS1
9600
OFF
OFF
19,200
ON
OFF
38,400
OFF
ON
76,800
ON
ON
C07166
Fig. 47 - RTU-- MP SW3 Dip Switch Settings
25
548J*14D
Power Exhaust (output): Connect the accessory Power
Exhaust contactor coil(s) per Fig. 46.
548J*14D
Fig. 48 - BACview6 Handheld Connections
C07170
Table 3 – LEDs
The LEDs on the RTU-- MP show the status of certain functions
If this LED is on...
Status is...
Power
The RTU MP has power
Rx
The RTU MP is receiving data from the network segment
Tx
The RTU MP is transmitting data over the network segment
DO#
The digital output is active
The Run and Error LEDs indicate control module and network status
If Run LED shows...
And Error LED shows...
Status is...
2 flashes per second
Off
Normal
2 flashes per second
2 flashes,
alternating with Run LED
Five minute auto---restart delay after system error
2 flashes per second
3 flashes,
then off
Control module has just been formatted
2 flashes per second
4 flashes,
then pause
Two or more devices on this network have the
same ARC156 network address
2 flashes per second
On
Exec halted after frequent system errors or
control programs halted
5 flashes per second
On
Exec start---up aborted, Boot is running
5 flashes per second
Off
Firmware transfer in progress, Boot is running
7 flashes per second
7 flashes per second, alternating with
Run LED
Ten second recovery period after brownout
14 flashes per second
14 flashes per second,
alternating with Run LED
Brownout
On
Failure. Try the following solutions:
S
Turn the RTU ---MP off, then on.
S
Format the RTU ---MP.
S
Download memory to the RTU ---MP.
S
Replace the RTU ---MP.
On
26
NOTE: Contact your Bryant applications engineer for
details on configuration of RTU-- MP, operating sequences
and troubleshooting information, as well as details on
configuration and troubleshooting of connected networks.
Smoke Detectors
Conduit nuts
(supplied by installer)
Conduit support plate
Terminal block cover
Controller housing
and electronics
Cover gasket
(ordering option)
Controller cover
Conduit couplings
(supplied by installer)
Fastener
(2X)
Units equipped with factory-- optional Return Air smoke
detectors require a relocation of the sensor module at unit
installation. See “Completing Installation of Return Air
Smoke Sensor:” on page 29 for details.
548J*14D
Smoke detectors are available as factory-- installed options
on 548J*14D models. Smoke detectors may be specified
for Supply Air only or for Return Air without or with
economizer or in combination of Supply Air and Return
Air. Return Air smoke detectors are arranged for vertical
return configurations only. All components necessary for
operation are factory-- provided and mounted. The unit is
factory-- configured for immediate smoke detector
shutdown operation; additional wiring or modifications to
unit terminal board may be necessary to complete the unit
and smoke detector configuration to meet project
requirements.
Duct smoke sensor
controller
Trouble
Alarm
Power
Test/reset
switch
System —
The smoke detector system consists of a four-- wire
controller and one or two sensors. Its primary function is
to shut down the rooftop unit in order to prevent smoke
from circulating throughout the building. It is not to be
used as a life saving device.
Fig. 49 - Controller Assembly
C08208
Controller —
The controller (see Fig. 49) includes a controller housing,
a printed circuit board, and a clear plastic cover. The
controller can be connected to one or two compatible duct
smoke sensors. The clear plastic cover is secured to the
housing with a single captive screw for easy access to the
wiring terminals. The controller has three LEDs (for
Power, Trouble and Alarm) and a manual test/reset button,
all located on the cover face.
Duct smoke sensor
Exhaust tube
Exhaust gasket
Sensor housing
and electronics
See
Detail A
Intake
gasket
Sensor —
The sensor (see Fig. 50) includes a plastic housing, a
printed circuit board, a clear plastic cover, a sampling
tube inlet and an exhaust tube. The sampling tube (when
used) and exhaust tube are attached during installation.
The sampling tube varies in length depending on the size
of the rooftop unit. The clear plastic cover permits visual
inspections without having to disassemble the sensor. The
cover attaches to the sensor housing using four captive
screws and forms an airtight chamber around the sensing
electronics. Each sensor includes a harness with an RJ45
terminal for connecting to the controller. Each sensor has
four LEDs (for Power, Trouble, Alarm and Dirty) and a
manual test/reset button (on the left-- side of the housing).
Cover gasket
(ordering option)
TSD-CO2
(ordering option)
Sensor cover
Plug
Sampling tube
(ordered separately)
Coupling
Detail A
Magnetic
test/reset
switch
Alarm
Trouble
Power
Dirty
Fig. 50 - Smoke Detector Sensor
27
C08209
548J*14D
Air is introduced to the duct smoke detector sensor’s
sensing chamber through a sampling tube that extends into
the HVAC duct and is directed back into the ventilation
system through a (shorter) exhaust tube. The difference in
air pressure between the two tubes pulls the sampled air
through the sensing chamber. When a sufficient amount of
smoke is detected in the sensing chamber, the sensor
signals an alarm state and the controller automatically
takes the appropriate action to shut down fans and
blowers, change over air handling systems, notify the fire
alarm control panel, etc.
The sensor uses a process called differential sensing to
prevent gradual environmental changes from triggering
false alarms. A rapid change in environmental conditions,
such as smoke from a fire, causes the sensor to signal an
alarm state but dust and debris accumulated over time
does not.
For installations using two sensors, the duct smoke
detector does not differentiate which sensor signals an
alarm or trouble condition.
Smoke Detector Locations
Supply Air —
Return Air without Economizer —
The sampling tube is located across the return air opening
on the unit basepan. See Fig. 52. The holes in the
sampling tube face downward, into the return air stream.
The sampling tube is connected via tubing to the return air
sensor that is mounted on a bracket high on the partition
between return filter and controller location. (This sensor
is shipped in a flat-- mounting location. Installation
requires that this sensor be relocated to its operating
location and the tubing to the sampling tube be connected.
See “Completing Installation of Return Air Smoke
Sensor:” on page 29 for details.)
Return Air with Economizer —
The sampling tube is inserted through the side plates of
the economizer housing, placing it across the return air
opening on the unit basepan. See Fig. 52. The holes in the
sampling tube face downward, into the return air stream.
The sampling tube is connected via tubing to the return air
sensor that is mounted on a bracket high on the partition
between return filter and controller location. (This sensor
is shipped in a flat-- mounting location. Installation
requires that this sensor be relocated to its operating
location and the tubing to the sampling tube be connected.
See the following installation procedure.)
The Supply Air smoke detector sensor is located to the
left of the unit’s indoor (supply) fan. See Fig. 51. Access
is through the left side blower access panel. There is no
sampling tube used at this location. The sampling tube
inlet extends through the side plate of the fan housing
(into a high pressure area). The controller is located on a
bracket to the right of the return filter, accessed through
the lift-- off filter panel.
Flexible
Exhaust Tube
Return Air
Sampling Tube
Smoke Detector Sensor
C10330
Fig. 52 - Return Air Sampling Tube Location
C08245
Fig. 51 - Typical Supply Air Smoke Detector Sensor
Location
28
Completing Installation of Return Air Smoke Sensor:
1. Unscrew the two screws holding the Return Air
Sensor detector plate. See Fig. 53. Save the screws.
2. Remove the Return Air Sensor and its detector plate.
3. Rotate the detector plate so the sensor is facing outwards and the sampling tube connection is on the bottom. See Fig. 54.
4. Screw the sensor and detector plate into its operating
position using screws from Step 1. Make sure the
sampling tube connection is on the bottom and the exhaust tube is on the top. See Fig. 54.
5. Connect the flexible tube on the sampling inlet to the
sampling tube on the basepan.
Additional Application Data —
Refer to Catalog No. HKRNKA-- 1XA for discussions on
additional control features of these smoke detectors
including multiple unit coordination.
548J*14D
Controller
Screws
Flexible
Exhaust
Tubes
Sampling Tube
C10331
Fig. 53 - Return Air Detector Shipping Position
Sampling Tube
C10332
Fig. 54 - Return Air Sensor Operating Position
29
IFM TYPE
ELEC. HTR
MED
MED
MED
HIGH
575---3---60
STD
HIGH
460---3---60
548J*14D
STD
HIGH
548J*14D
208/230---3---60
STD
NOM. V ---Ph---Hz
UNIT
Table 4 – Unit Wire/Fuse or HACR Breaker Sizing Data
PE
NO C.O. or UNPWR C.O.
NO P.E.
CRHEATER
***A00
Nom
(kW)
FLA
NONE
---
291A00
FLA
w/ P.E. (pwrd fr/unit)
DISC. SIZE
MCA
FUSE or
HACR
BRKR
FLA
LRA
---
62.4
80
65
12.4/16.5
34.4/39.7
105.4/112.0
110/125
288A00,291A00
19.9/26.5
55.3/63.8
131.5/142.2
294A00
25.2/33.5
69.9/80.6
149.8/163.2
288A00,294A00
32.7/43.5
90.7/104.7
291A00,294A00
37.6/50.0
NONE
DISC. SIZE
MCA
FUSE or
HACR
BRKR
FLA
366
66.2
80
70
370
105/111
400/406
109.2/115.8
110/125
109/115
404/410
150/150
129/139
477/494
135.3/146.0
150/150
133/143
481/498
150/175
146/158
436/447
153.6/167.0
175/175
150/162
440/451
175.8/193.3
200/200
170/186
547/575
179.6/197.1
200/200
174/190
551/579
104.3/120.3
192.8/182.7
200/200
185/204
575/607
196.6/186.5
200/200
190/208
579/611
---
---
62.4
80
65
366
66.2
80
70
370
291A00
12.4/16.5
34.4/39.7
105.4/112.0
110/125
105/111
400/406
109.2/115.8
110/125
109/115
404/410
288A00,291A00
19.9/26.5
55.3/63.8
131.5/142.2
150/150
129/139
477/494
135.3/146.0
150/150
133/143
481/498
294A00
25.2/33.5
69.9/80.6
149.8/163.2
150/175
146/158
436/447
153.6/167.0
175/175
150/162
440/451
288A00,294A00
32.7/43.5
90.7/104.7
175.8/193.3
200/200
170/186
547/575
179.6/197.1
200/200
174/190
551/579
291A00,294A00
37.6/50.0
104.3/120.3
192.8/182.7
200/200
185/204
575/607
196.6/186.5
200/200
190/208
579/611
NONE
---
---
75.3
90
80
402
79.1
100
85
406
291A00
12.4/16.5
34.4/39.7
118.3/124.9
125/125
120/126
436/442
122.1/128.7
125/150
124/130
440/446
288A00,291A00
19.9/26.5
55.3/63.8
144.4/155.1
150/175
144/154
513/530
148.2/158.9
150/175
148/158
517/534
294A00
25.2/33.5
69.9/80.6
162.7/176.1
175/200
161/173
472/483
166.5/179.9
175/200
165/177
476/487
288A00,294A00
32.7/43.5
90.7/104.7
188.7/206.2
200/225
184/201
583/611
192.5/210.0
200/225
189/205
587/615
291A00,294A00
37.6/50.0
104.3/120.3
205.7/195.6
225/225
200/219
611/643
209.5/199.4
225/225
204/223
615/647
NONE
---
---
29.7
40
31
184
31.5
40
33
186
292A00
16.5
19.9
54.5
60
54
204
56.3
60
56
206
289A00,292A00
26.5
31.9
69.5
70
68
248
71.3
80
70
250
295A00
33.5
40.3
80.0
90
77
224
81.8
90
79
226
289A00,295A00
43.5
52.3
95.0
100
91
289
96.8
100
93
291
292A00,295A00
50.0
60.2
89.9
100
100
304
91.7
100
102
306
NONE
---
---
29.7
40
31
184
31.5
40
33
186
292A00
16.5
19.9
54.5
60
54
204
56.3
60
56
206
289A00,292A00
26.5
31.9
69.5
70
68
248
71.3
80
70
250
295A00
33.5
40.3
80.0
90
77
224
81.8
90
79
226
289A00,295A00
43.5
52.3
95.0
100
91
289
96.8
100
93
291
292A00,295A00
50.0
60.2
89.9
100
100
304
91.7
100
102
306
NONE
---
---
36.5
45
39
202
38.3
45
41
204
292A00
16.5
19.9
61.3
70
62
222
63.1
70
64
224
289A00,292A00
26.5
31.9
76.3
80
76
266
78.1
80
78
268
295A00
33.5
40.3
86.8
90
85
242
88.6
90
87
244
289A00,295A00
43.5
52.3
101.8
110
99
307
103.6
110
101
309
292A00,295A00
50.0
60.2
96.7
100
108
322
98.5
110
110
324
NONE
---
---
24.0
30
25
136
27.8
30
30
140
293A00
16.5
15.9
43.9
45
43
152
47.7
50
48
156
290A00,293A00
26.5
25.5
55.9
60
55
187
59.7
60
59
191
296A00
33.5
32.2
64.3
70
62
168
68.1
70
67
172
290A00,296A00
43.5
41.8
76.3
80
73
220
80.1
90
78
224
293A00,296A00
50.0
48.1
72.1
80
81
232
75.9
80
85
236
NONE
---
---
24.0
30
25
136
27.8
30
30
140
293A00
16.5
15.9
43.9
45
43
152
47.7
50
48
156
290A00,293A00
26.5
25.5
55.9
60
55
187
59.7
60
59
191
296A00
33.5
32.2
64.3
70
62
168
68.1
70
67
172
290A00,296A00
43.5
41.8
76.3
80
73
220
80.1
90
78
224
293A00,296A00
50.0
48.1
72.1
80
81
232
75.9
80
85
236
NONE
---
---
30.4
35
32
148
34.2
40
37
152
293A00
16.5
15.9
50.2
60
51
164
54.0
60
55
168
290A00,293A00
26.5
25.5
62.2
70
62
199
66.0
70
66
203
296A00
33.5
32.2
70.6
80
69
180
74.4
80
74
184
290A00,296A00
43.5
41.8
82.6
90
80
232
86.4
90
85
236
293A00,296A00
50.0
48.1
78.5
90
88
244
82.3
90
92
248
3.8
3.8
3.8
1.8
1.8
1.8
3.8
3.8
3.8
NOTE: See page 32 for table legend and notes.
30
LRA
MED
MED
HIGH
575---3---60
STD
HIGH
MED
STD
HIGH
208/230---3---60
460---3---60
548J*14D
PE
w/ PWRD C.O.
NO P.E.
CRHEATER
***A00
Nom
(kW)
FLA
NONE
---
291A00
FLA
w/ P.E. (pwrd fr/unit)
DISC. SIZE
MCA
FUSE or
HACR
BRKR
FLA
LRA
---
67.2
80
71
12.4/16.5
34.4/39.7
110.2/116.8
125/125
288A00,291A00
19.9/26.5
55.3/63.8
136.3/147.0
294A00
25.2/33.5
69.9/80.6
154.6/168.0
288A00,294A00
32.7/43.5
90.7/104.7
291A00,294A00
37.6/50.0
NONE
DISC. SIZE
MCA
FUSE or
HACR
BRKR
FLA
371
71.0
80
75
375
110/116
405/411
114.0/120.6
125/125
115/121
409/415
150/150
134/144
482/499
140.1/150.8
150/175
139/149
486/503
175/175
151/164
441/452
158.4/171.8
175/175
156/168
445/456
180.6/198.1
200/200
175/191
552/580
184.4/201.9
200/225
180/196
556/584
104.3/120.3
197.6/187.5
200/200
191/209
580/612
201.4/191.3
225/200
195/214
584/616
---
---
67.2
80
71
371
71.0
80
75
375
291A00
12.4/16.5
34.4/39.7
110.2/116.8
125/125
110/116
405/411
114.0/120.6
125/125
115/121
409/415
288A00,291A00
19.9/26.5
55.3/63.8
136.3/147.0
150/150
134/144
482/499
140.1/150.8
150/175
139/149
486/503
294A00
25.2/33.5
69.9/80.6
154.6/168.0
175/175
151/164
441/452
158.4/171.8
175/175
156/168
445/456
288A00,294A00
32.7/43.5
90.7/104.7
180.6/198.1
200/200
175/191
552/580
184.4/201.9
200/225
180/196
556/584
291A00,294A00
37.6/50.0
104.3/120.3
197.6/187.5
200/200
191/209
580/612
201.4/191.3
225/200
195/214
584/616
NONE
---
---
80.1
100
86
407
83.9
100
90
411
291A00
12.4/16.5
34.4/39.7
123.1/129.7
125/150
125/131
441/447
126.9/133.5
150/150
130/136
445/451
288A00,291A00
19.9/26.5
55.3/63.8
149.2/159.9
150/175
149/159
518/535
153.0/163.7
175/175
154/163
522/539
294A00
25.2/33.5
69.9/80.6
167.5/180.9
175/200
166/178
477/488
171.3/184.7
175/200
170/183
481/492
288A00,294A00
32.7/43.5
90.7/104.7
193.5/211.0
200/225
190/206
588/616
197.3/214.8
200/225
194/210
592/620
291A00,294A00
37.6/50.0
104.3/120.3
210.5/200.4
225/225
206/224
616/648
214.3/204.2
225/225
210/228
620/652
NONE
---
---
31.9
40
34
186
33.7
40
36
188
292A00
16.5
19.9
56.7
60
56
206
58.5
60
59
208
289A00,292A00
26.5
31.9
71.7
80
70
250
73.5
80
72
252
295A00
33.5
40.3
82.2
90
80
226
84.0
90
82
228
289A00,295A00
43.5
52.3
97.2
100
94
291
99.0
100
96
293
292A00,295A00
50.0
60.2
92.1
100
103
306
93.9
100
105
308
NONE
---
---
31.9
40
34
186
33.7
40
36
188
292A00
16.5
19.9
56.7
60
56
206
58.5
60
59
208
289A00,292A00
26.5
31.9
71.7
80
70
250
73.5
80
72
252
295A00
33.5
40.3
82.2
90
80
226
84.0
90
82
228
289A00,295A00
43.5
52.3
97.2
100
94
291
99.0
100
96
293
292A00,295A00
50.0
60.2
92.1
100
103
306
93.9
100
105
308
NONE
---
---
38.7
45
41
204
40.5
50
43
206
292A00
16.5
19.9
63.5
70
64
224
65.3
70
66
226
289A00,292A00
26.5
31.9
78.5
80
78
268
80.3
90
80
270
295A00
33.5
40.3
89.0
90
88
244
90.8
100
90
246
289A00,295A00
43.5
52.3
104.0
110
102
309
105.8
110
104
311
292A00,295A00
50.0
60.2
98.9
110
111
324
100.7
110
113
326
NONE
---
---
25.7
30
27
138
29.5
35
32
142
293A00
16.5
15.9
45.6
50
45
154
49.4
50
50
158
290A00,293A00
26.5
25.5
57.6
60
56
189
61.4
70
61
193
296A00
33.5
32.2
66.0
70
64
170
69.8
70
69
174
290A00,296A00
43.5
41.8
78.0
80
75
222
81.8
90
80
226
293A00,296A00
50.0
48.1
73.8
80
82
234
77.6
80
87
238
NONE
---
---
25.7
30
27
138
29.5
35
32
142
293A00
16.5
15.9
45.6
50
45
154
49.4
50
50
158
290A00,293A00
26.5
25.5
57.6
60
56
189
61.4
70
61
193
296A00
33.5
32.2
66.0
70
64
170
69.8
70
69
174
290A00,296A00
43.5
41.8
78.0
80
75
222
81.8
90
80
226
293A00,296A00
50.0
48.1
73.8
80
82
234
77.6
80
87
238
NONE
---
---
32.1
40
34
150
35.9
40
39
154
293A00
16.5
15.9
51.9
60
53
166
55.7
60
57
170
290A00,293A00
26.5
25.5
63.9
70
64
201
67.7
70
68
205
296A00
33.5
32.2
72.3
80
71
182
76.1
80
76
186
290A00,296A00
43.5
41.8
84.3
90
82
234
88.1
90
87
238
293A00,296A00
50.0
48.1
80.2
90
90
246
84.0
90
94
250
3.8
3.8
3.8
1.8
1.8
1.8
3.8
3.8
3.8
NOTE: See page 32 for table legend and notes.
31
LRA
548J*14D
IFM TYPE
ELEC. HTR
STD
NOM. V ---Ph---Hz
UNIT
Table 4 – Unit Wire/Fuse or HACR Breaker Sizing Data (cont)
548J*14D
Legend and Notes for Table 4
LEGEND:
BRKR
--- Circuit breaker
CO
--- Convenient outlet
DISC
--- Disconnect
FLA
--- Full load amps
IFM
--- Indoor fan motor
LRA
--- Locked rotor amps
MCA
--- Minimum circuit amps
PE
--- Power exhaust
PWRD CO
--- Powered convenient outlet
UNPWR CO
--- Unpowered convenient outlet
NOTES:
1. In compliance with NEC requirements for multimotor and
combination load equipment (refer to NEC Articles 430 and
440), the overcurrent protective device for the unit shall be
fuse or HACR breaker. Canadian units may be fuse or circuit
breaker.
2. Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply
voltage is greater than 2%. Use the following formula to determine the percentage 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)
3
=
681
3
227
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.
% Voltage Imbalance
= 100 x
4
227
= 1.76%
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.
Economizer
2 Position Damper
Unit Without Economizer or
2 Position Damper
Fig. 55 - EconoMi$ert IV Wiring
C10333
Step 11 — Adjust Factory--Installed Options
EconoMi$er IV Occupancy Switch —
Smoke Detectors —
Refer to Fig. 55 for general EconoMi$er IV wiring.
External occupancy control is managed through a
connection on the Central Terminal Board.
Smoke detector(s) will be connected at the Central
Terminal Board (CTB), at terminals marked “Smoke
Shutdown”. Remove jumper JMP 3 when ready to
energize unit.
If external occupancy control is desired, connect a time
clock or remotely controlled switch (closed for Occupied,
open for Unoccupied sequence) at terminals marked
OCCUPANCY on CTB. Remove or cut jumper JMP 2 to
complete the installation.
32
Pre-- Start and Start-- Up
Available accessories include:
This completes the mechanical installation of the unit.
Refer to the unit’s Service Manual for detailed Pre-- Start
and Start-- up instructions.
Roof Curb (must be installed before unit)
Thru-- base connection kit (must be installed before unit
is set on curb; see page 15)
Manual outside air damper
Two-- Position motorized outside air damper (see page 9)
EconoMi$er IV (with control and integrated barometric
relief; see page 8)
EconoMi$er2 (without control/for external signal and
integrated barometric relief; see page 8)
Power Exhaust
Differential dry-- bulb sensor (EconoMi$er IV)
Outdoor enthalpy sensor
Differential enthalpy sensor
Electric Heaters (see page 16)
Single Point kits (see page 17)
Thermostat / Sensors (see pages 21-- 22)
CO2 sensor (see pages 22-- 24)
Louvered hail guard
Phase monitor control
548J*14D
Step 12 — Install Accessories
Refer to separate installation instructions for information
on installing these accessories.
33
34
548J*14D
35
548J*14D
548J*14D
E2011 Bryant Heating & Cooling Systems D 7310 W. Morris St. D Indianapolis, IN 46231
Printed in U.S.A.
Edition Date: 01/11
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
36
Catalog No.: II548J---07
Replaces: II548J--- 06
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