• A wide assortment of factory-installed options available,
including high-static drives that provide additional performance range
• Factory-installed optional gear driven EconoMi$erIV (vertical
return for sizes 024-120 only) for use with standard rooftop
unit controls (includes CO
• Factory-installed optional gear driven EconoMi$er2 (vertical
return only) for use with third party controls (includes 4 to
20 mA actuator for demand control ventilation)
• State-of-the-art defrost system
• Dependable 4-way valve operation
Heat Options
• Field-installed electric heat available
• Glycol hydronic coils
sensor control capability)
2
FEATURES/BENEFITS
Every compact one-piece unit arrives fully assembled,
charged, tested, and ready to run.
QUIET, EFFICIENT OPERATION AND DEPENDABLE PERFORMANCE — Compressors have vibration isolators for quiet
operation. Efficient fan and motor design permits operation at
low sound levels.
Unit sizes 090-180 offer lower utility costs through part-load
operation using 2 stages of cooling.
Quiet and efficient operation is provided by belt-driven indoor
fans (standard on all units over 5 tons). The belt-driven indoor
fan is equipped with variable-pitch pulleys which allow adjustment within the rpm ranges of the factory-supplied pulleys.
Increased operating efficiency is achieved through computerdesigned coils featuring staggered internally enhanced copper
tubes. Fins are ripple-edged for strength, lanced, and double
waved for higher heat transfer.
DURABLE, DEPENDABLE CONSTRUCTION — Designed for
durability in any climate, the weather-resistant cabinets are
constructed of galvanized steel and bonderized, and all exterior
panels are coated with a prepainted baked enamel finish. The
paint finish is non-chalking, and is capable of withstanding
ASTM (American Society for Testing and Materials) B117
500-hour Salt Spray Test. All internal cabinet panels are primed,
permitting longer life and a more attractive appearance for the
entire unit.
In addition, all size 024-120 units are designed with a sing le,
continuous top piece to eliminate any possible leaks. Totally
enclosed outdoor-fan motors and permanently lubricated bearings provide additional unit dependability.
Patented State-of-the-Art Chronotemp™ Defrost System
uses time and temperature to keep the outdoor coil frost-free for
economical, dependable operation. The Chronotemp defrost
board can be easily configured for defrost cycles eve ry 30, 50,
or 90 minutes.
Dependable 4-Way Valve Operation safely and efficiently
accomplishes cycle reversals, defrost, and normal operation.
EASY INST ALLATION AND CONVERSION
All Units are Shipped in the Vertical Duct Configuration for
fit-up to standard roof curbs. (3 different curb sizes fit unit sizes
024-072, 090-120, and 150,180 respectively.) The contractor
can order and install the roof curb early in the construction
stage, before decisions on size requirements are made.
All units feature a base rail design with forklift slots and rigging
holes for easier maneuvering. Durable packaging protects all
units during shipment and storage.
The units can be easily converted from a vertical to a horizontal
duct configuration by relocating the panels supplied with the
unit.
T o Convert 024-120 Units from vertical to horizontal discharge,
simply relocate 2 panels. The same basic unit can be used for a
variety of applications and can be quickly modified at the
jobsite.
To Convert Size 150 and 180 Units from vertical to horizontal
discharge, use the optional horizontal supply/return adapter
roof curb.
Convenient Duct Openings in the unit basepans permit sideby-side or concentric duct connections (see Application Data
section) without requiring internal unit modification (size
150,180 only).
NOTE: On units using horizontal supply and return, the accessory barometric relief or power exhaust MUST be installed on
the return ductwork.
Thru-the-bottom service connection capability comes standard
with the rooftop unit to allow power and control wiring to be
routed through the unit’s basepan, thereby minimizing roof penetrations (to prevent water leaks). Power and control connections are made on the same side of the unit to simplify
installation.
The Non-Corrosive Sloped Condensate Drain Pan permits
either an external horizontal side condensate drain (outside the
roof curb) or an internal vertical bottom drain (inside the roof
curb). Both options require an external, field-supplied P-trap.
Standard 2-in. Throwaway Filters are easily accessed
through a removable panel located above the air intake hood.
No tools are required to change unit filters.
All 024-120 Units are Designed With a Single, Continuous
Top Piece to eliminate leaking at the seams or gasketing.
Belt-Driven Indoor-Fan Motors allow maximum on-site flexi-
bility without changing motors or drives.
Field-Installed Accessory Electric heaters are available in a
wide range of capacities. An available single-point wiring kit
makes installation simple.
Low Voltage Wiring Connections are easily made due to the
large terminal board which is located for quick, convenient
access.
In addition, color-coded wires permit easy tracing and
diagnostics.
PROVEN COMPRESSOR RELIABILITY
Design techniques feature computer-programmed balance
between compressor, condenser , and evaporator. Bryant-specified
hermetic compressors are equipped with compressor overcurrent
and overtemperature protection to ensure dependability.
All units have a fixed orifice metering device which precisely
controls refrigerant flow, preventing slugging and flood-back,
while maintaining optimum unit performance. Refrigerant filter
driers are standard.
Standard Low Ambient Cooling Operation to 25 F; optional
head pressure control kit available for outdoor ambient con ditions to –20 F.
2
INTEGRATED ECONOMIZERS AND OUTDOOR-AIR
DAMPERS
Available as options or accessories, economizers and manual
outdoor-air dampers introduce outdoor air which mixes with the
conditioned air, improving indoor-air quality and often reducing
energy consumption.
During a first stage call for cooling, if the outdoor-air temperature is below the economizer control changeover set point, the
mixed-air sensor modulates the economizer outdoor-air damper
open to take advantage of free cooling provided by the outside
air. When second-stage cooling is called for, the compressor is
energized in addition to the economizer. If the outdoor-air temperature is above the changeover set point, the first stage of
compression is activated and the economizer damper stays at
minimum position.
Accessory upgrade kits allow for control by differential dry-bulb
temperature (outdoor vs return), outdoor air enthalpy
changeover, or more precise differential enthalpy control.
Units can be equipped with different economizer options to
meet specific controls applications. The factory-installed or
field-installed EconoMi$erIV and EconoMi$er2 are available.
The EconoMi$erIV is used with the standard rooftop unit
controls and includes an industry standard, stand-alone, solidstate control. The control can be used with a CO
sensor for
2
DCV (demand control ventilation) operation. For direct digital
control (DDC) applications, the EconoMi$er2 can be operated
using a third party controller. The EconoMi$er2 includes 4 to
20 mA actuator capability for demand control ventilation
applications.
All economizers incorporate a parallel blade, gear driven
damper system for efficient air mixing and reliable control. In
addition, the standard damper actuator includes a spring return
to provide reliable closure on power loss. The economi zers for
sizes 024-120 are equipped with up to 100% barometric relief
capability for high outdoor airflow operations. Economizers for
unit sizes 024-120 are available, factory-installed, for vertical
return only. Economizers for unit sizes 150 and 180 are compatible for vertical or horizontal return. An optional field-installed
barometric relief package is available for 150 and 180 size
units.
In addition, single-stage power exhaust is available as a fieldinstalled accessory for EconoMi$erIV to help maintain proper
building pressure.
For units without economizer, year-round ventilation is
enhanced by a manual outdoor-air damper. On size 024-120
units, a 25% or 50% manual damper is available as a fieldinstalled accessory. Unit sizes 150 and 180 are equipped with a
manual 25% damper.
SERVICE OPTIONS
Servicing a rooftop unit has never been easier with the new
factory-installed service options for these rooftop units. These
options include the following:
• Hinged access panels (549B, 549C and 542J only) are provided for the filter/indoor-fan motor, compressors, indoor fan,
and control box areas. Quick access to major components is
accomplished by simply unlatching and swinging open the
various panels. Each hinged panel is permanently mounted to
the unit, thereby eliminating the concern of a dropped or windblown panel puncturing delicate roof materials. The
4 extended access panels are also equipped with ‘‘tie back’’
retaining devices to hold the door in the open position while
servicing the unit.
• An external, covered, 115-v Ground Fault Interrupt (GFI)
receptacle is provided as a convenient power source for drills,
lights, refrigerant recovery units, or other electrical service
tools. Simply connect the outlet to a field-supplied and properly fused branch circuit power supply.
• An integral non-fused disconnect switch within the rooftop unit
reduces installation time, labor and material costs. Safety is
assured by an interlock which prevents access to the control
box unless the switch is in the OFF position. In addition, the
externally mounted handle incorporates power lockout capability to further protect service personnel.
INDOOR-AIR QUALITY BEGINS WITH BRYANT ROOFTOPS
Sloped condensate pans minimize biological growth in rooftop
units in accordance with ASHRAE Standard 62. Two-inch filters
with optional dirty filter indicator switch provide for greater particle reduction in the return air. The face-split evaporator coils
improve the dehumidification capability of standard units, maximize building humidity control.
Optional proportional reacting CO
sensor is available with the
2
EconoMi$erIV outdoor air damper option/accessory to aid the
IAQ benefits.
3
MODEL NUMBER NOMENCLATURE — 548F UNITS
Voltage Designation
E– 460-3-60
J– 208/230-1-60†
P– 208/230-3-60
T– 575-3-60
COP— Coefficient of Performance
db— dry bulb
EER— Energy Efficiency Ratio
HSPF — Heating Seasonal Performance Factor
IPLV— Integrated Part-Load Values
SEER — Seasonal Energy Efficiency Ratio
wb— wet bulb
*Air Conditioning and Refrigeration Institute.
†Applies only to units with capacity of 60,000 Btuh or less.
**The IPLV applies only to 2-stage cooling heat pump units.
NOTES:
1. Rated in accordance with ARI Standards 210/240-95 and 270-95.
2. Ratings are net values, reflecting the effects of circulating fan heat.
3. ALL the 548F036-060 units are in compliance with ASHRAE 90.1
2001 Energy Standard for minimum SEER and EER requirements.
Refer to state and local codes or visit the following website:
http://solstice.crest.org/efficiency/bcap
with this standard pertains to a given geographical area of the United
States.
NOMINAL
TONS
NOMINAL
TONS
1
/
2
LEGEND
ARI* CAPACITY RATINGS
548F036-060
COOLING
Net Capacity
(Btuh)
Belt
Drive
SEER†
Direct
Drive
548F072-120
COOLING
Net Capacity
(Btuh)
86,0009.0078,0003.0039,0001.809.386
EER
HEATING
(High)
Capacity
(Btuh)
COP
4. Ratings are based on:
Capacity
(Btuh)
to determine if compliance
Cooling Standard: 80 F db, 67 F wb indoor entering-air temperature
and 95 F db air entering outdoor unit.
IPLV Standard: 80 F db, 67 F wb indoor entering-air temperature and
80 F db outdoor entering-air temperature.
High-Temp Heating St andard: 70 F db indoor entering-air temperature
and 47 F db, 43 F wb outdoor entering-air temperature.
Low-Temp Heating Standard: 70 F db indoor entering-air temperature
and 17 F db, 15 F wb outdoor entering-air temperature.
Cap.— Net Capacity (Btuh)
COP— Coefficient of Performance
EER— Energy Efficiency Ratio
HSPF — Heating Seasonal Performance Factor
IPLV— Integrated Part-Load Values
SEER — Seasonal Energy Efficiency Ratio
*Air Conditioning and Refrigeration Institute.
†Applies only to units with capacity of 60,000 Btuh or less.
NOTE: Rated in accordance with ARI Standard 210/240-94 and 270-
95. Ratings are net values, reflecting effects of circulating fan heat.
Supplementary electric heat is not included. Ratings based on:
Cooling Standard: 80 F db (dry bulb), 67 F wb (wet bulb) indoor entering-air temperature and 95 F db outdoor entering-air temperature.
IPLV Standard: 80 F db, 67 F wb indoor entering-air temperature and
80 F db outdoor entering-air temperature.
High-Temp Heating Standard: 70 F db indoor entering-air te mpe ratu re
and 47 F db, 43 F wb outdoor entering-air temperature.
Low-Temp Heating Standard: 70 F db indoor entering-air temperature
and 17 F db, 15 F wb outdoor entering-air temperature.
ALL the 549B units are in compliance with ASHRAE 90.1 2001 Energy
Standard for minimum SEER and EER requirement s. Refer to state and
local codes or visit the following website: http://solstice.crest.org/
efficiency/bcap to determine if compliance with this standard pertains to
a given geographical area of the United States.
db— Dry Bulb
EER— Energy Efficiency Ratio
ESP— External Static Pressure
IPLV— Integrated Part-Load Value
wb— Wet Bulb
*Air-Conditioning and Refrigeration Institute.
NOTE: 50HJQ units are rated in accordance with ARI Standard 340-93.
Cooling ratings are net values, reflecting the effects of circulating fan
heat. Ratings are based on:
ESP: –.35 in. wg
Cooling Standard: 80 F db, 67 wb indoor coil entering-air temperature
and 95 F outdoor entering-air temperature.
High-Temp Heating Standard: 70 F db indoor coil entering-air temperature and 47 F db, 43 F wb outdoor coil entering-air temperature.
Low-Temp Heating Standard: 70 F db indoor coil entering-air temperature and 17 F db, 15 F wb outdoor coil entering-air temperature.
COOLINGHEATING-HIGH TEMPHEATING-LOW TEMP
Net
Capacity
(Btuh)
CfmIPLVEER
Total
Capacity
(Btuh)
Total
kW
IPLV Standard: 80 F db, 67 F wb indoor entering-air temperature and
80 F db outdoor entering-air temperature.
ALL the 542J units are in compliance with ASHRAE 90.1 2001 Energy
Standard for minimum SEER and EER requirement s. Refer to state and
local codes or visit the following website: http://solstice.crest.org/
efficiency/bcap to determine if compliance with this standard pertains to
a given geographical area of the United States.
COP
Total
Capacity
(Btuh)
Total
kW
COP
6
SOUND
RATING
(decibels)
OPTIONS AND ACCESSORIES
548F036-120
ITEMOPTION*ACCESSORY†
100% Open Two-Position DamperX
25% Open Two-Position DamperX
Alternate Motors and DrivesXX
Convenience Outlet (Load Side)X
Copper Fins Indoor and Outdoor CoilX
Copper Fins Outdoor CoilX
E-Coat Outdoor Coil (Aluminum)X
E-Coat Outdoor Coil (Copper)X
EconoMi$erIV with ControllerXX
EconoMi$er2 (without Controller)XX
Electric HeatX
Electronic Programmable ThermostatX
Emergency Heat PackageX
Enthalpy or Differential Enthalpy SensorX
Fan/Filter StatusX
High-Static Motor and DriveX
Hinged Panel Kit for EconomizerX
Indoor Air Quality (CO
Louvered Hail GuardX
Manual Outdoor-Air Damper (50% or 100%)X
Motormaster® I, II Head Pressure Control (Low Ambient Kit)X
Outdoor Air Enthalpy Sensor X
Outdoor Air/Return Air Temperature SensorX
Outdoor Coil GrilleX
Outdoor Coil Hail Guard AssemblyX
Power Exhaust with Barometric ReliefX
Pre-coat Aluminum Fins on Outdoor CoilX
Return Air Enthalpy Sensor X
Return Air Temperature Sensor X
Roof Curbs (Vertical and Horizontal Discharge)X
Thermostats and SubbasesX
Thru-the-Bottom Utility ConnectionsX
Time Guard II Control Circuit (Compressor Cycle Delay)X
Unit-Mounted Non-Fused DisconnectX
*Factory-installed.
†Field-installed.
NOTES:
1. Refer to unit guide specifications, price pages, or contact your
local representative for accessory and option package information.
2. Some options may increase product lead times.
) SensorX
2
7
OPTIONS AND ACCESSORIES (cont)
549B036-120, 549C024-060
ITEMOPTION*ACCESSORY†
100% Open Two-Position DamperX
25% Open Two-Position DamperX
Alternate Motors and DrivesXX
Convenience Outlet (Load Side)X
Copper Fins Indoor and Outdoor CoilX
Copper Fins Outdoor CoilX
E-Coat Outdoor Coil (Aluminum)X
E-Coat Outdoor Coil (Copper)X
EconoMi$erIV with ControllerXX
EconoMi$er2 (without Controller)XX
Electric HeatX
Electronic Programmable ThermostatX
Emergency Heat PackageX
Fan/Filter StatusX
Hinged Access PanelsX
Hinged Panel Kit for EconomizerX
Indoor Air Quality (CO
Louvered Hail GuardX
Manual Outdoor-Air DamperX
Motormaster® I, II Head Pressure Control (Low Ambient Kit)X
Outdoor Air Enthalpy SensorX
Outdoor Coil GrilleX
Outdoor Coil Hail Guard AssemblyX
Outdoor Air/Return Air Temperature SensorX
Power Exhaust with Barometric ReliefX
Pre-coat Aluminum Fins on Outdoor CoilX
Return Air Enthalpy SensorX
Return Air Temperature SensorX
Roof Curbs (Vertical and Horizontal Discharge)X
Thermostats and SubbasesX
Thru-the-Bottom Utility ConnectionsX
Time Guard II Control Circuit (Compressor Cycle Delay)X
Unit-Mounted Non-Fused DisconnectX
*Factory-installed.
†Field-installed.
NOTES:
1. Refer to unit guide specifications, price pages, or contact your
local representative for accessory and option package information.
2. Some options may increase product lead times.
) SensorX
2
8
OPTIONS AND ACCESSORIES (cont)
542J150,180
ITEMOPTION*ACCESSORY†
25% Open Two-Position DamperX
Alternate Motors and DrivesXX
Barometric Relief Damper (Not for use with horizontal roof curb)X
Convenience Outlet (Load Side)X
Copper Fins Indoor and Outdoor CoilX
Copper Fins Outdoor CoilX
E-Coat Outdoor Coil (Aluminum)X
E-Coat Outdoor Coil (Copper)X
EconoMi$erIV with ControllerXX
EconoMi$er2 (without Controller)X
Electric HeatX
Electronic Programmable ThermostatX
Emergency Heat PackageX
Fan/Filter StatusX
Hinged Access PanelsX
Horizontal Adapter CurbX
Hydronic Glycol CoilX
Indoor Air Quality (CO
Manual Outdoor-Air DamperX
Motormaster® V Head Pressure Control (Low Ambient Kit)X
Outdoor Air Enthalpy SensorX
Power Exhaust without Barometric Relief X
Pre-coat Aluminum Fins on Outdoor CoilX
Return Air Enthalpy Sensor X
Return Air Temperature SensorX
Roof Curbs (Vertical and Horizontal Discharge)X
Thermostats and SubbasesX
Time Guard II Control Circuit (Compressor Cycle Delay)X
Winter Start Time DelayX
*Factory-installed.
†Field-installed.
NOTES:
1. Refer to unit price pages or contact your local representative for
accessory and option package information.
2. Some options may increase product lead times.
) SensorX
2
9
OPTIONS AND ACCESSORIES (cont)
Roof Curbs (Horizontal and Vertical) permit installation and
securing of ductwork to curb prior to mounting unit on the curb.
Both 14-in. and 24-in. roof curbs are available as field-installed
accessories.
EconoMi$erIV is available as a factory-installed option in
vertical supply/return configuration only for unit sizes 036-120.
Vertical or horizontal configuration is available for unit sizes 150
and 180. (EconoMi$erIV is available as a field-installed accessory for horizontal and/or vertical supply return configurations.)
The EconoMi$erIV is provided with an industry standard,
standalone, solid-state controller that is easy to configure and
troubleshoot. The EconoMi$erIV is compatible with non-DDC
applications. EconoMi$erIV is equipped with a barometric relief
damper capable of relieving up to 100% return air. Dry bulb
outdoor-air temperature sensor is provided as standard. The
return air sensor, indoor enthalpy sensor, and outdoor enthalpy
sensor are provided as field-installed accessories to provide
enthalpy control, differential enthalpy control, and differential
dry bulb temperature control.
EconoMi$er2 is available as a factory-installed option in vertical supply/return configuration only. (EconoMi$er2 is available
as a field-installed accessory for horizontal and/or vertical
supply return configurations.) The EconoMi$er2 is provided
without a controller for use with field-installed third-party controls. EconoMi$er2 is equipped with a barometric relief damper
capable of relieving up to 100% return air. Dry bulb outdoor-air
temperature sensor is provided as standard. The enthalpy,
differential temperature (adjustable), and differential enthalpy
control are provided as field-installed accessories. The
EconoMi$er2 is capable of control from a 4 to 20 mA signal
through optional 4 to 20 mA design without microprocessor
control (required for third party control interface).
Manual Outdoor-Air Damper accessory can be preset to
admit up to 50% outdoor air for year round ventilation.
Tw o- Po s it i on Da m pe r package is available as an accessory.
Both 25% or 100% outdoor air dampers are available.
Head Pressure Control (Motormaster) accessory package
maintains condensing temperature between 90 F and 110 F at
outdoor ambient temperatures down to –20 F by condenser-fan
speed modulation or condenser-fan cycling and wind baffles.
Electric Resistance Heaters are UL listed and available to
match heating requirements. Single point kits available for each
heater when required. Heaters are field-installed accessories.
Unit-Mounted, Non-Fused Disconnect Switch provides unit
power shutoff. The switch is accessible from outside the unit
and provides power off lockout capability and is available as
factory-installed option .
Convenience Outlet is factory-installed and internally mounted
with easily accessible 115-v female receptacle.
Compressor Cycle Delay (Time Guard II) prevents unit from
restarting for minimum of 5 minutes after shutdown.
Thru-the-Bottom Utility Connectors permit electrical connections to be brought to the unit through the basepan. Connectors
are a field-installed accessory.
Fan/Filter Status Switch accessory provides status of indoor
(evaporator) fan (ON/ OFF) or filter (CLEAN/DIRTY).
Power Exhaust accessory will provide system exhaust of up to
100% of return air (vertical only). The power exhaust is a fieldinstalled accessory (separate vertical and horizontal design).
Ultra-Violet Germicidal Lamps eliminate odor causing mold
and fungus that may develop in the wet area of the evaporator
section of the unit. The high output, low temperature germicidal
lamps are field installed in the evaporator section of the un it,
aimed at the evaporator coil and condensate pan.
Hinged Panel Option provides hinged access panels for the filter, compressor, evaporator fan, and control box areas. Filter
hinged panels permit tool-less entry for changing filters. Each
hinged panel is permanently attached to the rooftop unit and is
a factory-installed option.
Emergency Heat Control Package accessory activates auxiliary heat when necessary if mechanical heating is locked out.
10
TR1
24 Vac
COM
TR
24
Vac
HOT
12
3
4
5
EF
EF1
+
_
P1
T1
P
T
N
EXH
2V10V
EXH
Set
Set
2V10V
2V10V
DCV
DCV
Free
Cool
B
C
A
D
SO+
SR+
SR
SO
AQ1
AQ
DCV
Min
Pos
Open
Max
N1
ECONOMI$ERIV CONTROL
GEAR-DRIVEN ECONOMI$ERIV COMPONENT PARTS
(3 to 6 Ton Unit Shown)
UNIT-MOUNTED DISCONNECT (Sizes 150,180)
UNIT-MOUNTED DISCONNECT (Sizes 024-120)
CONVENIENCE OUTLET
a50-7750
a50-8041
50-1247
50-1246
a48-4181
a48-7445
OPTIONS AND ACCESSORIES (cont)
WIRING
HARNESS
ACTUATOR
ECONOMI$ERIV
CONTROLLER
OUTSIDE AIR
TEMPERATURE SENSOR
LOW AMBIENT
SENSOR
11
OPTIONS AND ACCESSORIES (cont)
CONTROL BOX HINGED PANEL OPTION,
549B036-072 UNITS SHOWN
CONTROL BOX HINGED PANEL OPTION,
549B090-120 UNITS SHOWN
COMPRESSOR HINGED PANEL OPTION,
549B090-120 UNITS SHOWN
COMPRESSOR HINGED PANEL OPTION,
549B036-060 UNITS SHOWN
NOTE: Hinged access panels are not available on 548F units.
a50-8042
50-1298
50-1288
50-1289
12
OPTIONS AND ACCESSORIES (cont)
EVAPORATOR-FAN HINGED PANEL OPTION
FILTER HINGED PANEL OPTION
NOTE: Hinged access panels are not available on 548F units.
LOUVERED HAIL GUARD OPTON
(024-120 only)
50-1290
a50-8043
a50-8059
13
PHYSICAL DATA
548F
548F036-072
UNIT SIZE 548F036048060072
NOMINAL CAPACITY (tons)3456
OPERATING WEIGHT (lb)
Unit500520550590
Economizer
EconoMi$erIV or EconoMi$er250505050
Roof Curb*115115115115
COMPRESSORHermetic
Quantity1111
Oil (oz)45545054
REFRIGERANT TYPER-22
Operating Charge (lb-oz)
Circuit 15-16-08-011-2
Circuit 2————
OUTDOOR COIL
Rows...Fins/in.1...171...172...172...17
Total Face Area (sq ft)10.3114.5812.2516.53
Standard Compressor Internal Relief (Differential)450 ± 50
Cutout428
Reset (Auto.)320
LOSS-OF-CHARGE (LOW-PRESSURE) SWITCH (psig)
Cutout7 ± 3
Reset (Auto.)22 ± 5
FREEZE PROTECTION THERMOSTAT (F)
Opens30 ± 5
Closes45 ± 5
OUTDOOR-AIR INLET SCREENSCleanable.
RETURN-AIR FILTERSThrowaway
Quantity...Size (in.)4...16 x 20 x 24...20 x 20 x 2
LEGEND
Bhp — Brake Horsepower
*Weight of 14-in. roof curb.
1
/
2
3
/8-in. OD Enhanced Copper Tubes, Aluminum Lanced Fins,
1
/4...1100
/8-in. OD Enhanced Copper Tubes, Aluminum Double-Wavy Fins,
Fixed Orifice Metering Device
Fixed Orifice Metering Device
5
/
8
5
/
8
7
/
8
10
1
/4...1100
5
7
7
/
8
/
8
/
8
Screen quantity and size vary based on options selected.
15
BASE UNIT DIMENSIONS
548F036-072
a50-8044
548F
16
BASE UNIT DIMENSIONS (cont)
548F090,120
a50-8045
548F
17
ACCESSORY DIMENSIONS
TO ENSURE AIRTIGHT CONNECTION.
PLACE UNIT AS CLOSE TO THIS
END AS POSSIBLE
TO ENSURE AIRTIGHT CONNECTION.
PLACE UNIT AS CLOSE TO THIS
END AS POSSIBLE
ROOF CURB
ACCESSORY
AUNIT SIZE
CRRFCURB001A00
1′-2″
[356]
548F036-072
CRRFCURB002A00
2′-0″
[610]
NOTES:
1. Roof curb accessory is shipped disassembled.
2. In su late d panels.
3. Dimensions in [ ] are in millimeters.
4. Roof curb: galvanized steel.
5. Attach ductwork to curb (flanges of duct rest on curb).
6. Service clearance: 4 ft on each side.
7. Direction of airflow.
8. Connector packages CRBTMPWR001A00 and
002A00 are for thru-the-curb type gas. Packages
CRBTMPWR003A00 and 004A00 are for thru-thebottom type gas connections.
CONNECTOR
PKG. ACCY.
BC
D ALT
DRAIN HOLE
GASPOWERCONTROL
CRBTMPWR001A00
1′-9
11
/
16
″
[551]
1′-4″
[406]
13/
4
″
[44.5]
3
/
4
″
[19] NPT
3
/4″ [19] NPT
1
/
2
″
[12.7]
CRBTMPWR002A001
1
/4″ [31.7]
CRBTMPWR003A00
1
/
2
″
[12.7] NPT
3
/4″ [19] NPT
1
/
2
″
[12.7]
CRBTMPWR004A00
3
/
4
″
[19] NPT
11/4″ [31.7]
548F036-072
a48-5374
548F
18
ACCESSORY DIMENSIONS (cont)
TO ENSURE AN AIRTIGHT CONNECTION,
PLACE UNIT ON CURB AS CLOSE TO
DUCT END AS POSSIBLE.
TO ENSURE AN AIRTIGHT CONNECTION,
PLACE UNIT ON CURB AS CLOSE TO
DUCT END AS POSSIBLE.
5. Attach ductwork to curb (flanges of duct rest on
curb).
6. Service clearance 4 ft on each side.
7.Direction of airflow.
8. Connector packages CRBTMPWR001A00 and
2A00 are for thru-the-curb gas type. Packages
CRBTMPWR003A00 and 4A00 are for thruthe-bottom type gas connections.
Enter Cooling Capacities table at outdoor entering temperature of 95 F, indoor air entering at 1600 cfm and
67 F ewb. The 548F048 unit will provide a total cooling
capacity of 49,900 Btuh and a sensible heat capacity of
33,900 Btuh.
For indoor-air temperature other than 80 F edb, calculate
sensible heat capacity correction, as required, using the
formula found in Note 3 following the cooling capacities
tables.
NOTE: Unit ratings are gross capacities and do not
include the effect of indoor-fan motor heat. To calculate
net capacities, see Step V.
III SELECT ELECTRIC HEAT.
Enter the Instantaneous and Integrated Heating Ratings
table at 1600 cfm. At 70 F return indoor air and 0° F air
entering outdoor coil, the integrated heating capacity is
18,000 Btuh. (Select integrated heating capacity value
since deductions for outdoor-coil frost and defrosting have
already been made. No correction is required.)
The required heating capacity is 35,000 Btuh. Therefore,
17,000 Btuh (35,000 – 18,000) additional electric heat is
required.
Determine additional electric heat capacity in kW.
Enter the Electric Heating Capacities table (page 52) for
548F048 at 208/230, 3 phase. The 6.5-kW heater at 240 v
most closely satisfies the heating required. To calculate
kW at 230 v, use the Multiplication Factors table.
6.5 kW x .92 = 5.98 kW
6.5 kW x .92 x 3413 = 20,410 Btuh
Total unit heating capacity is 38,410 Btuh (18,000 +
20,410).
IV DETERMINE FAN SPEED AND POWER REQUIRE-
MENTS AT DESIGN CONDITIONS.
Before entering Fan Performance tables, calculate the
total static pressure required based on unit components.
From the given and the Pressure Drop tables, find:
External static pressure.45 in. wg
EconoMi$erIV.07 in. wg
Electric heat.09 in. wg
Total static pressure.61 in. wg
Enter the Fan Performance table for 548F048 vertical discharge. At 1600 cfm and 230-v high speed, the standard
motor will deliver 0.76 in. wg static pressure, 723 watts,
and 0.64 brake horsepower (bhp). This will adequately
handle job requirements.
V DETERMINE NET CAPACITIES.
Capacities are gross and do not include the effect of
indoor-fan motor (IFM) heat.
Determine net cooling capacity as follows:
Net capacity = Total capacity – IFM heat
= 49,900 Btuh – (723 Watts x 3.413
Btuh/Watts)
= 49,900 Btuh – 2468 Btuh
= 47,432
Net sensible capacity = 33,900 Btuh – 2468 Btuh
= 31,432 Btuh
Integrated heating capacity is maximum (instantaneous)
capacity less the effect of frost on the outdoor coil and the
heat required to defrost it. Therefore, net capacity is equal
to 38,410 Btuh, the total heating capacity determined in
Step III.
1. Boldface indicates field-supplied drive is required.
2. Maximum continuous bhp is 1.00.
GENERAL FAN PERFORMANCE NOTES
1. Extensive motor and electrical testing on these units ensures that
the full range of the motor can be utilized with confidence. Using
your fan motors up to the wattage ratings shown will not result in nuisance tripping or premature motor failure. Unit warranty will not be
affected. For additional information on motor performance, refer to
Indoor Fan Motor Performance table on page 54.
2. Values include losses for filters, unit casing, and wet coils. See
Accessory/FIOP Static Pressure tables on page 50 for accessory
static pressure information.
3. Use of a field-supplied motor may affect wire sizing. Contact your
Bryant representative for details.
4. Interpolation is permissible. Do not extrapolate.
*The static pressure must be added to external static pressure. The
sum and the evaporator entering-air cfm should then be used in conjunction with the Fan Performance tables to determine blower rpm and
watts.
CFM
50
Vertical EconoMi$erIV and
EconoMi$er2 Performance Data
(548F036-120)
VERTICAL POWER EXHAUST PERFORMANCE
Horizontal EconoMi$erIV and
EconoMi$er2 Performance Data
(548F036-120)
HORIZONTAL POWER EXHAUST PERFORMANCE
BAROMETRIC RELIEF FLOW CAPACITY
OUTDOOR AIR DAMPER LEAKAGE
BAROMETRIC RELIEF CAPACITY
OUTDOOR AIR DAMPER LEAKAGE
5000
0
500
1000
1500
2000
2500
0 0.1 0.2 0.3 0.40.5
STATIC PRESSURE (in. wg)
FLOW (cfm)
a50-8046
a50-8047
a50-8048
a48-6309
a50-8050
a50-8051
548F
4000
3000
2000
FLOW (cfm)
1000
0
PERFORMANCE DATA — 548F (cont)
036 - 072
090 - 120
0 0.1 0.2 0.3 0.4 0.5
STATIC PRESSURE (in. wg)
2500
2000
1500
1000
500
0
FLOW IN CUBIC FEET PER MINUTE (cfm)
0.05
0.15
STATIC PRESSURE (in. wg)
0.25
30
25
20
15
10
5
0
0.13 0. 20 0.22 0. 25 0.30 0.35 0. 40 0.45 0. 50
FLOW IN CUBIC FEET PER MINUTE (cfm)
STATIC PRESSURE (in. wg)
036 - 072
090 - 120
036 - 072
090 - 120
2500
2000
1500
1000
500
Flow i n cubic feet per m inute (cfm)
0
0.05"0.15"0.25"
30
25
20
15
10
5
Flow i n cubic feet per m inute (cfm)
0
0.1"0 .2"0.3 "0. 4"0.5"
StaticPressure (in. wg)
Static Pressure
(in. wg)
036 - 072
090 - 120
036 - 072
090 - 120
51
PERFORMANCE DATA — 548F (cont)
548F
ELECTRIC HEATING CAPACITIES — 548F036-072
UNIT
548F
036
048
060
072
*Two heater packages required to provide kW indicated.
†Use CRSINGLE004A00 for units with convenience outlet.
**Use CRSINGLE002A00 for units with convenience outlet.
††Use CRSINGLE002A00 for units with high-static motor and convenience outlet.
NOTES:
1. The rated heater voltage is 240, 480, and 575 v. If power distribution voltage varies from rated heater voltage, heater kW will vary accordingly.
2. To determine heater kW at voltages other than those shown in table, use the following formula:
Heater kW new = Heater kW rated x (unit power distribution voltage/rated heater voltage)
As an example:
For a 16 kW heater rated at 240 v with a power distribution voltage of 215 v
kW new = 16 kW (215/240)
kW new = 12.8 kW (rating at 215 v)
VOLTAGE
(60 Hz)
208/230/240
(single phase)
208/230/240
(3 phase)
460/480
(3 phase)
208/230/240
(single phase)
208/230/240
(3 phase)
460/480
(3 phase)
208/230/240
(single phase)
208/230/240
(3 phase)
460/480
(3 phase)
208/230/240
(3 phase)
460/480
(3 phase)
2
ACCESSORY
kW
3.3/ 4.0/ 4.4
4.9/ 6.0/ 6.5
6.5/ 8.0/ 8.7
7.9/ 9.6/10.5
9.8/12.0/13.0*
3.3/ 4.0/ 4.4
4.9/ 6.0/ 6.5
6.5/ 8.0/ 8.7
7.9/ 9.6/10.5
12.0/14.7/16.0
5.5/ 6.0
8.1/ 8.8
10.6/11.5
12.9/14.0
3.3/ 4.0/ 4.4
6.5/ 8.0/ 8.7
9.8/12.0/13.0*
13.1/16.0/17.4*
15.8/19.3/21.0*
4.9/ 6.0/ 6.5
6.5/ 8.0/ 8.7
12.0/14.7/16.0
15.8/19.3/21.0*
5.5/ 6.0
10.6/11.5
12.9/14.0
21.1/23.0*
4.9/ 6.0/ 6.5
6.5/ 8.0/ 8.7
9.8/12.0/13.0*
13.1/16.0/17.4*
15.8/19.3/21.0*
4.9/ 6.0/ 6.5
7.9/ 9.6/10.5
12.0/14.7/16.0
15.8/19.3/21.0*
19.9/24.3/26.5*
5.5/ 6.0
10.6/11.5
12.9/14.0
21.1/23.0*
23.4/25.5*
4.9/ 6.0/ 6.5
7.9/ 9.6/10.5
12.0/14.7/16.0
15.8/19.3/21.0*
19.9/24.3/26.5*
5.5/ 6.0
10.6/11.5
12.9/14.0
21.1/23.0*
23.4/25.5*
ACCESSORY HEATER
PART NUMBER
CRHEATER - - - A00
001
002
003
004
002 & 002
001
002
003
004
005
006
007
008
009
001
003
002 & 002
003 & 003
004 & 004
002
003
005
004 & 004
006
008
009
008 & 008
002
003
002 & 002
003 & 003
004 & 004
002
004
005
004 & 004
004 & 005
006
008
009
008 & 008
008 & 009
002
004
005
004 & 004
004 & 006
006
008
009
008 & 008
008 & 009
2
SINGLE POINT BOX
PACKAGE NO.
CRSINGLE---A00
—
—†
004
004
005
—
—
—
—
002
—
—
—
—
—†
004
005
005
005
—
—
002
003
—
—
—
—
004
004
005
005
005
—
—**
002
003
003
—
—
—
—
—
—††
002
002
003
003
—
—
—
—
—
52
PERFORMANCE DATA — 548F (cont)
548F
ELECTRIC HEATING CAPACITIES — 548F090-120
UNIT
548F
090
120
*Two heater package s required to provide kW indicated.
NOTES:
1. The rated heater voltage is 240, 480, and 575 v. If power distribution voltage varies from rated heater voltage, heater kW will vary accordingly.
2. To determine heater kW at voltages other than those shown in table, use the following formula:
Heater kW new = Heater kW rated x (unit power distribution voltage/rated heater voltage )
As an example:
For a 16 kW heater rated at 240 v with a power distribution voltage of 215 v
kW new = 16 kW (215/240)
kW new = 12.8 kW (rating at 215 v)
UNIT VOLTAGE
(60 Hz)
208/230/240
(3 phase)
460/480
(3 phase)
575
(3 phase)
208/230/240
(3 phase)
460/480
(3 phase)
575
(3 phase)
2
ACCESSORY
kW
7.8/ 9.6/10.4
12.0/14.7/16.0
18.6/22.8/24.8
24.0/29.4/32.0
31.8/39.0/42.4*
12.8/13.9
15.2/16.5
25.6/27.8
30.4/33.0
38.4/41.7*
17.0
34.0
7.8/ 9.6/10.4
12.0/14.7/16.0
24.0/29.4/32.0
31.8/39.0/42.4*
37.6/46.2/50.0*
15.2/16.5
25.6/27.8
30.4/33.0
38.4/41.7*
45.9/50.0*
17.0
34.0
51.0*
ELECTRIC HEATER
PART NUMBER
CRHEATER---A00
017
010
011
012
012 and 017
016
013
014
015
014 and 016
018
019
017
010
012
012 and 017
010 and 012
013
014
015
014 and 016
013 and 015
018
019
018 and 019
2
SINGLE POINT BOX
PACKAGE NO.
CRSINGLE---A00
007
007
009
009
013
006
006
008
008
010
006
006
012
012
015
017
017
011
014
014
016
016
011
014
016
53
PERFORMANCE DATA — 548F (cont)
548F
INDOOR-FAN MOTOR PERFORMANCE — 548F036-120 UNITS
UNIT
548F
036
048
060
072
090
120
BHP — Brake Horsepower
*Extensive motor and electrical testing on these units ensures that the full horse-
power range of the motors can be utilized with confidence. Using your fan
motors up to the horsepower ratings shown in this table will not result in nuisance tripping or premature motor failure. Unit warranty will not be affected.
†Single-phase/three-phase.
LEGEND
INDOOR-FAN
MOTOR
Standard
Alternate
High Static
Standard
Alternate
High Static
Standard
Alternate
High Static
Standard
High Static
Standard,
Alternate
High Static
Standard
Alternate
High Static
UNIT
VOLTAGE
208/230
4601.3
5751.3
208/230
4602.1
5752.1
208/230
4603.0
5753.0
208/230
4601.8
5751.8
208/230
4602.1
5752.1
208/230
4603.0
5753.0
208/230
4603.2
5753.2
208/230
4603.0
5753.0
208/230
4603.9
5753.9
208/230
4603.0
5753.0
208/230
4603.9
5753.9
208/230
4603.0
5753.0
208/230
4605.5
5755.5
208/230
4603.0
5753.0
208/230
4603.9
5753.9
208/230
4608.5
5758.5
MAXIMUM ACCEPTABLE
CONTINUOUS BHP*
0.34440
1.001000
2.402120
0.75850
1.001000
2.402120
1.201340
1.30/2.40†2120
2.902562
2.402120
2.902562
2.402120
3.703313
2.402120
2.902615
5.254400
MAXIMUM ACCEPTABLE
OPERATING WATTS
NOTES:
1. All indoor-fan motors 5 hp and larger meet the minimum efficiency requirements as established by the Energy Policy Act of 1992 (EPACT) effective
October 24, 1997.
2. High-static motor not available on single-phase units.
MAXIMUM
AMP DRAW
2.8
4.9
6.0
3.5
4.9
6.0
5.9
7.6/6.0†
8.6
6.0
8.6
6.0
11.7
6.0
8.6
17.3
MOTOR
EFFICIENCY (%)
75
75
74
84
80
80
54
548F
548F036-120 (UNITS WITHOUT ELECTRICAL CONVENIENCE OUTLET)
VOLTAGE
UNIT
548F
036
(3 Tons)
048
(4 Tons)
NOTE: Legend and Notes for Electrical Data are on page 57.
548F036-120 (UNITS WITHOUT ELECTRICAL CONVENIENCE OUTL ET) (cont)
VOLTAGE
UNIT
548F
072
(6 Tons)
FLA— Full Load Amps
HACR — Heating, Air Conditioning and Refrigeration
IFM— Indoor Fan Motor
LRA— Locked Rotor Amps
MCA — Minimum Circuit Amps
MOCP — Maximum Overcurrent Protection
NEC— National Electrical Code
OFM — Outdoor Fan Motor
RLA— Rated Load Amps
*Heaters are field installed only.
†Used to determine minimum disconnect size per NEC.
**Heater capacity (kW) is based on heater voltage of 208 v, 240 v and 480 v. If
power distribution voltage to unit varies from rated heater voltage, heater kW
will vary accordingly.
††Fuse or HACR circuit breaker.
***Optional disconnect switch is unavailable.
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.
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 percent of voltage
N/A — Not available
NOTE: If a single power source is to be used, size wire to include power exhaust
MCA and MOCP.
Check MCA and MOCP when power exhaust is powered through the unit. Deter-
mine the new MCA including the power exhaust using the following formula:
MCA New = MCA unit only + MCA of Power Exhaust
For example, using a 548F060 unit with MCA = 35.6 and MOCP = 40, with
CRPWREXH030A01 power exhaust.
MCA New = 35.6 amps + 1.6 amps = 37.2 amps
If the new MCA does not exceed the published MOCP, then MOCP would not
change. The MOCP in this example is 40 amps and the MCA New is below 40;
therefore the MOCP is acceptable. If “MCA New” is larger than the published
MOCP, raise the MOCP to the next larger size. In all cases, the MOCP for the
power exhaust should be 15 amps per NEC.
MCA
(230 v)
MCA
(460 v)
MCA
(575 v)
(for separate
power source)
MOCP
57
548F036-120 (UNITS WITHOUT ELECTRICAL CONVENIENCE OUTLET) (cont)
548F
VOLTAGE
UNIT
548F
090
1
(7
/2 Tons)
NOTE: Legend and Notes for Electrical Data are on page 57.
548F036-120 (UNITS WITH ELECTRICAL CONVENIENCE OUTLET) (cont)
VOLTAGE
UNIT
548F
072
(6 Tons)
NOMINAL
V-PH-Hz
208/230-3-60
460-3-60
575-3-60
IFM
TYPE
STD187 25422.71 46.01.45.8
HIGH-STATIC 18725422.7146.01.47.5
STD414 50811.473.00.72.6
HIGH-STATIC 414 50811.473.00.73.4
STD518 6329.158.40.72.6——15.820††1678
HIGH-STATIC 5186329.158.40.73.4——16.420††1685
RANGE
Min MaxRLALRA
LEGEND
FLA— Full Load Amps
HACR — Heating, Air Conditioning and Refrigeration
IFM— Indoor Fan Motor
LRA — Locked Rotor Am ps
MCA — Minimum Circuit Amps
MOCP — Maximum Overcurrent Protection
NEC — National Electrical Code
OFM — Outdoor Fan Motor
RLA — Rated Load Amps
*Heaters are field installed only.
†Used to determine minimum disconnect size per NEC.
**Heater capacity (kW) is based on heater voltage of 208 v, 240 v and 480 v. If
power distribution voltage to unit varies from rated heater voltage, heater kW
will vary accordingly.
††Fuse or HACR circuit breaker.
***Optional disconnect switch is unavailable.
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.
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 percent of voltage
N/A — Not available
NOTE: If a single power source is to be used, size wire to include power exhaust
MCA and MOCP.
Check MCA and MOCP when power exhaust is powered through the unit. Deter-
mine the new MCA including the power exhaust using the following formula:
MCA New = MCA unit only + MCA of Power Exhaust
For example, using a 548F060 unit with MCA = 35.6 and MOCP = 40, with
CRPWREXH030A01 power exhaust.
MCA New = 35.6 amps + 1.6 amps = 37.2 amps
If the new MCA does not exceed the published MOCP, then MOCP would not
change. The MOCP in this example is 40 amps and the MCA New is below 40;
therefore the MOCP is acceptable. If “MCA New” is larger than the published
MOCP, raise the MOCP to the next larger size. In all cases, the MOCP for the
power exhaust should be 15 amps per NEC.
MCA
(230 v)
MCA
(460 v)
MCA
(575 v)
(for separate
power source)
MOCP
1371
=
3
=457
62
548F036-120 (UNITS WITH ELECTRICAL CONVENIENCE OUTLET) (cont)
548F
VOLTAGE
UNIT
548F
090
(71/2 Tons)
120
(10 Tons)
NOTE: Legend and Notes for Electrical Data are on page 64.
548F036-120 (UNITS WITH ELECTRICAL CONVENIENCE OUTLET) (cont)
VOLTAGE
UNIT
548F
120
(10 Tons)
FLA — Full Load Amps
HACR — Heating, Air Conditioning and Refrigeration
IFM — Indoor Fan Motor
LRA — Locked Rotor Amps
MCA — Minimum Circuit Amps
MOCP — Maximum Overcurrent Protection
NEC — National Electrical Code
OFM — Outdoor Fan Motor
RLA — Rated Load Amps
*Heaters are field installed only.
†Used to determine minimum disconnect size per NEC.
**Heater capacity (kW) is based on heater voltage of 208 v, 240 v, 480 v, and 575 v. If power
distribution voltage to unit varies from rated heater voltage, heater kW will vary accordingly.
††Fuse or HACR circuit breaker.
***Optional disconnect switch is unavailable.
NOTES:
1. In compliance with NEC requirements for multimotor and com bination load equipment (refer
to NEC Articles 430 and 440), the overcurrent protective device for the unit shall be fuse or
HACR breaker.
2. Unbalanced 3-Phase Supply VoltageNever operate a motor where a phase imbalance in supply voltage is greater than 2%. Use
the following formula to determine the percent of voltage imbalance.
% Voltage Imbalance
= 100 x
Example: Supply voltage is 460-3-60.
NOMINAL
V-PH-Hz
460-3-60
575-3-60
LEGEND
max voltage deviation from average voltage
AB = 452 v
BC = 464 v
AC = 455 v
IFM
TYPE
STD4145088.659.60.72.6
ALT4145088.659.60.73.4
HIGH-STATIC4145088.659.60.77.4
STD5186326.949.40.72.6
ALT5186326.949.40.73.4
HIGH-STATIC5186326.949.40.77.4
average voltage
Average Voltage =
RANGE
Min MaxRLALRA
452 + 464 + 455
1371
=
3
= 457
3
COMPRESSOR
(each)
OFM
FLA
ELECTRIC
IFM
FLA
HEAT*
Nominal
kW**
——25.530††27145
16.519.850.360††50165
27.833.467.37065178
33.039.775.28073185
41.750.288.39085195***
50.060.185.69096205***
——26.330††28185
16.519.851.160††51204
27.833.468.17066218
33.039.776.08073224
41.750.289.19086235***
50.060.186.49097245***
——30.335††32179
16.519.855.160††55198
27.833.472.18071212
33.039.780.08078218
41.750.293.110090229***
50.060.190.4100102239***
——20.525††22120
17.017.141.845††41137
34.034.163.17061154
51.051.271.78080171***
——21.125††22151
17.017.142.545††42168
34.034.163.77062185
51.051.272.38081202***
——24.325††26146
17.017.145.750††46163
34.034.166.97065180
51.051.275.58085198***
Determine maximum deviation from average voltage.
(AB) 457 – 452 = 5 v
(BC) 464 – 457 = 7 v
(AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
% Voltage Imbalance = 100 x
This amount of phase imbalance is satisfactory as it is below the maximum allowab le 2%.
IMPORTANT: If the supply voltage phase imbalance is more than 2%, contact your local
N/A — Not available
NOTE: If a single power source is to be used, size wire to include power exhaust MCA and
MOCP.
Check MCA and MOCP when power exhaust is powered through the u nit. Determine the new
MCA including the power exhaust using th e following formula:
MCA New = MCA unit only + MCA of Power Exhaust
For example, using a 548F060 unit with MCA = 35.6 and MOCP = 40, with
CRPWREXH030A01 power exhaust.
MCA New = 35.6 amps + 1.6 amps = 37.2 amps
If the new MCA does not exceed the published MOCP, then MOCP would not change. The
MOCP in this example is 40 amps and the MCA New is below 40; therefore the MOCP is
acceptable. If “MCA New” is lar ger tha n the pu blis hed MO CP, raise the MOCP to the next larger
size. In all cases, the MOCP for the power exhaust should be 15 amps per NEC.
MCA
(230 v)
MCA
(460 v)
MCA
(575 v)
MOCP
(for separate
power source)
64
TYPICAL WIRING SCHEMATICS — 548F
AWG— American Wire Gage
C—Contactor, Compressor
CAP— Capacitor
CB— Circuit Breaker
CH— Crankcase Heater
COMP — Compressor Motor
DB— Defrost Board
DFT— Defrost Thermostat
EQUIP — Equipment
FPT— Freeze Protection Thermostat
GND— Ground
HC— Heater Contactor
HPS— High-Pressure Switch
HR— Heater Relay
IFC— Indoor Fan Contactor
IFM— Indoor Fan Motor
IFMOVL — Indoor Fan Motor Overload
1. 620 ohm, 1 watt 5% resister should be removed only when using differential enthalpy or dry bulb.
2. If a separate field-supplied 24v transformer is used for the IAQ sensor
power supply, it cannot have the secondary of the transformer grounded.
3. For field-installed remote minimum position POT, remove black wir e jumper
between P and P1 and set control minimum position POT to the minimum
position.
EconoMi$er2 Wiring
a48-7910
a50-8053
548F
NOTE 1
NOTE 2
50HJ540573
ACTUATOR
ASSEMBLY
DIRECT DRIVE
ACTUATOR
500 OHM
RESISTOR
RUN
-
+
OPTIONAL CO
SENSOR 4 - 20 mA
OUTPUT
2
BLACK
BLUE
VIOLET
PINK
RED
YELLOW
WHITE
4
3
5
2
8
6
7
1
10
11
9
12
66
ECONOMISER2 PLUG
TYPICAL WIRING SCHEMATICS — 548F (cont)
C2 FOR 008-014 UNITS
LINE SIDE
C
11
13
23
23
21
BLU
BLU
GRA
GRA
RED
GRARED
RED
YEL
YEL
208-230-1 ONLY
240V
H1
H1
H3
H2
H2
H4
TRAN4
TRAN4
TRAN4
X4
X2
X3
X1
WHTBLK
SECONDARY
120V
GROUND FAULT
INTERRUPTER
CONVENIENCE
OUTLET
GFI - CO
GRN-YEL
GRN-YEL
WHT
BLK
FUSE
15 AMP
TEST
RESET
SWITCH
SECONDARY
120V
SECONDARY
120V
X4
X2
X3
X1
600V
H1
H3
REDYEL BLU GRA
460V
H2
H4
X4
X2
X3
X1
FIELD
POWER
SUPPLY
UNIT
DISCONNECT
BLK
YEL
BLU
BLK
YEL
BLU
BLK
YEL
BLU
SINGLE POINT CONNECTION BOX
BLK
YEL
BLU
TB
Convenience Outlet (Optional) — 548F036-120
Non-Fused Disconnect (Optional) — 548F036-120
NOTE: Use copper conductors only.
a48-7462
a48-7463
548F
67
TYPICAL PIPING AND WIRING — 548F
Vertical Discharge Ducting
Horizontal Discharge Ducting
LEGEND
NEC — National Electrical Code
50-1279
50-1297
548F
68
GUIDE SPECIFICATIONS — 548F036-120
548F
PACKAGED ROOFTOP AIR-TO-AIR HEAT PUMP WITH
ELECTRIC HEAT OPTION — CONSTANT VOLUME
APPLICA TION
1.01 SYSTEM DESCRIPTION
Outdoor rooftop-mounted or slab-mounted, electrically
controlled air-to-air heat pump utilizing a hermetic compressor for heating and cooling duty. Unit shall discharge
supply air vertically or horizontally as shown on contract
drawings.
1.02 QUALITY ASSURANCE
A. Unit shall be rated in accordance with ARI Standards 210/
240 and 270.
B. Unit shall be designed to conform to ASHRAE 15, latest
revision, and in accordance with UL 1995.
C. Unit shall be UL tested and certified in accordance
with ANSI Z21.47 Standard and UL listed and certified
under Canadian Standards as a total package for safety
requirements.
D. Roof curb shall be designed to conform to NRCA
Standards.
E. Insulation and adhesive shall meet NFPA 90A require-
ments for flame spread and smoke generation.
F. Unit casing shall be capable of withstanding Federal Test
Method Standard No. 141 (Method 6061) 500-hour salt
spray test.
1.03 DELIVERY, STORAGE, AND HANDLING
Unit(s) shall be stored and handled per manufacturer’s
recommendations.
PART 2 — PRODUCTS
2.01 EQUIPMENT (STANDARD)
A. General:
Factory-assembled, single-piece, air-to-air heat pump.
Contained within the unit enclosure shall be all factory
wiring, piping, controls, refrigerant charge (R-22), and
special features required prior to field start-up.
B. Unit Cabinet:
1. Unit cabinet shall be constructed of galvanized steel,
2. Indoor fan cabinet interior shall be insulated with a
3. Cabinet panels shall be easily removable for
4. Holes shall be provided in the base rails for rigging
5. Unit shall have a factory-installed, sloped conden-
34,400 TO 105,000 BTUH,
NOMINAL (HEATING)
4 TO 50 kW NOMINAL (ELECTRIC HEATING)
bonderized and coated with a baked enamel finish
on all externally exposed surfaces with primer coated
internal panels.
1
minimum
/2-in. thick flexible fiberglass insulation
coated on the air side.
servicing.
shackles to facilitate overhead rigging, and forklift
slots shall be provided to facilitate maneuvering.
sate drain pan made of a non-corrosive material,
providing a minimum
3
/4-in. connection with both
vertical and horizontal drains and shall comply with
ASHRAE 62.
6. Unit shall have factory-installed filter access panel to
provide filter access with tool-less removal.
7. Unit shall have standard thru-the-bottom power connection capability.
C. Fans:
1. Indoor blower shall be of the direct-driven or
belt-driven, double inlet, forward-curved centrifugal
type. Belt drive shall include an adjustable-pitch
motor pulley.
2. Indoor blower shall be made from steel with a corrosion-resistant finish and shall be dynamically
balanced.
3. Bearings shall be of the sealed, permanently lubricated, ball-bearing type for longer life and lower
maintenance.
4. Outdoor fan shall be of the direct-driven propeller
type and shall discharge air vertically.
5. Outdoor fan shall have aluminum blades riveted to
corrosion-resistant steel spiders and shall be dynamically balanced.
D. Compressor(s):
1. Fully hermetic type, internally protected.
2. Factory rubber shock-mounted and internally spring
mounted for vibration isolation.
E. Coils:
1. Outdoor and indoor coils shall have aluminum plate
fins mechanically bonded to enhanced copper tubes
with all joints brazed.
2. Tube sheet openings shall be belled to prevent tube
wear.
3. Indoor coil shall be of the face split design.
4. Coils:
a. Copper-fin coils shall be constructed of copper
fins mechanically bonded to copper tubes and
copper tube sheets. Galvanized steel tube sheets
shall not be acceptable. A polymer strip shall prevent coil assembly from contacting the sheet
metal coil pan to minimize potential for galvanic
corrosion between coil and pan. All copper construction shall provide protection in moderate
coastal environments.
b. E-Coated aluminum-fin coils shall have a flexib le
epoxy polymer coating uniformly applied to all coil
surface areas without material bridging between
fins. Coating process shall ensure complete coil
encapsulation. Color shall be high gloss black
with gloss — 60 deg of 65 to 90% per ASTM
D523-89. Uniform dry film thickness from 0.8 to
1.2 mil on all surface areas including fi n edges.
Superior hardness characteristics of 2H per
ASTM D3363-92A and cross-hatch adhesion of
4B-5B per ASTM D3359-93. Impact resistance
shall be up to 160 in./lb (ASTM D2794-93).
Humidity and water immersion resistance shall be
up to minimum 1000 and 250 hours respectively
(ASTM D2247-92 and ASTM D870-92). Corrosion durability shall be confirmed through testing
to be no less than 1000 hours salt spray per
ASTM B117-90. Coil construction shall be aluminum fins mechanically bonded to copper tubes.
69
GUIDE SPECIFICATIONS — 548F036-120 (cont)
548F
c. E-Coated copper-fin coils shall have a flexible
epoxy polymer coating uniformly applied to all coil
surface areas without material bridging between
fins. Coating process shall ensure complete coil
encapsulation. Color shall be high gloss black
with gloss — 60 deg of 65 to 90% per ASTM
D523-89. Uniform dry film thickness from 0.8 to
1.2 mil on all surface areas including fin edges.
Superior hardness characteristics of 2H per
ASTM D3363-92A and cross-hatch adhesion of
4B-5B per ASTM D3359-93. Impact resistance
shall be up to 160 in./lb (ASTM D2794-93).
Humidity and water immersion resistance shall be
up to minimum 1000 and 250 hours respectively
(ASTM D2247-92 and ASTM D870-92). Corrosion durability shall be confirmed through testing
to be no less than 1000 hours salt spray per
ASTM B117-90. Coil construction shall be copper
fins mechanically bonded to copper tubes with
copper tube sheets. Galvanized steel tube sheets
shall not be acceptable. A polymer strip shall prevent coil assembly from contacting sheet metal
coil pan to maintain coating integrity and minimize
corrosion potential between coil and pan.
d. Op tional pre-co ated a luminu m-fin coil s shal l ha ve
a durable epoxy-phenolic coating to provide protection in mildly corrosive coastal environments.
Coating shall be applied to the aluminum fin stock
prior to the fin stamping process to create an inert
barrier between the aluminum fin and copper
tube. Epoxy-phenolic barrier shall minimize galvanic action between dissimilar metals.
F. Refrigerant Components: Refrigerant circuit components
2. Service gage connections on suction, discharge, and
liquid line to charge, evacuate, and contain
refrigerant.
3. Accumulator.
4. Reversing valve.
G. Filter Section:
1. Standard filter section shall consist of factoryinstalled low-velocity , throwaway 2-in. thick fiberglass
filters of commercially available sizes.
2. Filter face velocity shall not exceed 300 fpm at nominal airflows.
3. Filter section shall use only one size filter.
4. Filters shall be accessible through an access panel
with ‘‘no-tool’’ removal.
H. Controls and Safeties:
1. Unit Controls:
a. Unit shall be complete with self-contained low-
voltage control circuit.
b. Unit shall incorporate an outdoor coil defrost
system to prevent excessive frost accumulation
during heating duty, and shall be controlled as
follows:
1) Defrost shall be initiated on the basis of time
and coil temperature.
2) A 30/50/90-minute timer shall activate defrost
cycle only if coil temperature is low enough to
indicate a heavy frost condition.
3) Defrost cycle shall terminate when defrost
thermostat is satisfied and shall have a positive
termination time of 10 minutes.
c. Unit shall contain high-pressure, loss-of-charge/
low-pressure, and freeze protection switches. It
shall mount on factory-installed Schrader fittings.
2. Standard Safeties:
Unit shall incorporate compressor overtemperature
and overcurrent safety devices to shut off
compressor.
I. Operating Characteristics:
1. Unit shall be capable of starting and running in cool-
ing at 115 F ambient outdoor temperature, meeting
maximum load criteria of ARI Standard 210/240 at
±10% voltage.
2. Compressor with standard controls shall be capable
of cooling operation down to 25 F ambient outdoor
temperature.
3. Compressor shall be capable of operation in heating
duty down to –10 F ambient outdoor-air temperature.
4. Unit shall be capable of simultaneous heating duty
and defrost cycle operation when using electric heaters indicated in Section L, Special Features.
J. Electrical Requirements:
All unit power wiring shall enter unit cabinet at a single
factory-predrilled location.
K. Motors:
1. Compressor motors shall be cooled by refrigerant
passing through motor windings and shall have line
break thermal and current overload protection.
2. Indoor blower motor shall have permanently lubri-
cated bearings and inherent automatic-reset thermal
overload protection.
3. Totally enclosed outdoor-fan motor shall have
permanently lubricated bearings, and inherent
automatic-reset thermal overload protection.
L. Special Features:
Certain features are not applicable when the features
designated by * are specified. For assistance in amending the specifications, your local Bryant Sales Office
should be contacted.
1. Roof Curbs:
a. Formed galvanized steel with wood nailer strip
and capable of supporting entire unit weight.
b. Allows for installing and securing ductwork to
curb prior to mounting unit on the curb.
*2. Integrated Economizers:
a. Integrated integral modulating type capable of
simultaneous economizer and compressor operation. During economizer operation, up to two
compressors on sizes 090-120 will operate.
b. Available as a factory-installed option in vertical
supply/return configuration only. (Available as a
field-installed accessory for dedicated horizontal
and/or vertical supply return configurations.)
c. Includes all hardware and controls to provide
cooling with outdoor air.
d. Equipped with low-leakage dampers, not to
exceed 2% leakage at 1 in. wg pressure
differential.
e. Capable of introducing up to 100% outdoor air .
70
GUIDE SPECIFICATIONS — 548F036-120 (cont)
548F
f. EconoMi$erIV and EconoMi$er2 shall be equipped
with a barometric relief damper capable of relieving
up to 100% return air.
g. Designed to close damper(s) during loss-of-
power situations with spring return built into
motor.
h. Dry bulb outdoor-air temperature sensor shall be
provided as standard. Outdoor air sensor set
point is adjustable and shall range from 40 to
100 F. For the EconoMi$erIV, the return air sensor, indoor enthalpy sensor, and outdoor enthalpy
sensor shall be provided as field-installed
accessories to provide enthalpy control, differential enthalpy control, and differential dry bulb
temperature control. For the EconoMi$er2, the
enthalpy, differential temperature (adjustable),
and differential enthalpy control shall be provided
as field-installed accessories.
i. The EconoMi$erIV and EconoMi$er2 shall have a
gear-driven parallel blade design.
j. EconoMi$erIV microprocessor control shall pro-
vide control of internal building pressure through
its accessory power exhaust function. Factory set
at 100%, with a range of 0% to 100%.
k. EconoMi$er2 shall be capable of control fro m a 4
to 20 mA signal through optional 4 to 20 mA
design without microprocessor control (required
for third party control interface).
l. EconoMi$erIV Microprocessor Occupied Mini-
mum Damper Position Setting maintains the
minimum airflow into the building during occupied
period providing design ventilation rate for full
occupancy (damper position during heating). A
remote potentiometer may be used to override
the set point.
m. EconoMi$erIV Microprocessor Unoccupied Mini-
mum Damper Position Setting — The
EconoMi$erIV damper shall be completely closed
when the unit is in the occupied mo de.
n. EconoMi$erIV Microprocessor IAQ/DCV Maxi-
mum Damper Position Setting — Setting the
maximum position of the damper prevents the
introduction of large amounts of hot or cold air
into the space. This position is intended to satisfy
the base minimum ventilation rate.
o. EconoMi$erIV Microprocessor IAQ/DCV control
modulates the outdoor-air damper to provide ventilation based on the optional 2 to 10 vdc CO
sensor input.
p. Compressor lockout sensor (opens at 35 F,
closes at 50 F).
q. Actuator shall be direct coupled to economizer
gear, eliminating linkage arms and rods.
r. Control LEDs:
1) When the outdoor-air damper is capable of
providing free cooling, the “Free Cool” LED
shall illuminate.
2) The IAQ LED indicates when the module is on
the DCV mode.
3) The EXH LED indicates when the exhaust fan
contact is closed.
s. Remote Minimum Position Control — A field-
installed accessory remote potentiometer shall
allow the outdoor-air damper to be opened or
closed beyond the minimum position in the occupied mode for modified ventilation.
birdscreen, and rainhood which can be preset to
admit up to 100% outdoor air for year-round
ventilation.
* 5. 100% Two-Position Damper:
a. Two-position damper package shall include single
blade damper. Admits up to 100% outdoor air.
b. Damper shall close upon indoor fan shutoff.
c. Designed to close damper during loss of power
situations.
d. Equipped with barometric relief damper.
* 6. 25% Two-Position Damper:
a. Two-position damper package shall include single
blade damper and motor. Admits up to 25% out-
door air.
b. Damper shall close upon indoor fan shutoff.
* 7. Electric Resistance Heaters:
a. Open wire nichrome elements with all necessary
safety operating controls.
b. UL listed and indicated on b asic unit informative
plate.
c. Available in multiples to match heating
requirements.
d. Single point kits available for each heater when
required.
* 8. Head Pressure Control Packages:
Package shall consist of solid-state control and outdoor-coil temperature sensor to maintain condensing
temperature between 90 F and 110 F at outdoor
ambient temperatures down to –20 F by outdoor fan
speed modulation or outdoor fan cycling.
* 9. Thermostat and Subbase:
2
Thermostat and subbase provide staged cooling and
heating automatic (or manual) changeover, fan control, and indicator light.
10. Thru-The-Bottom Utility Connections:
Kit shall provide connectors to permit electrical con-
nections to be brought to the unit through the
basepan.
* 11. Electronic Programmable Thermostat:
Unit shall be capable of using deluxe full-featured
electronic thermostat. Thermostat shall use built-in
compressor cycle delay control for both heating and
cooling duty. Thermostat shall be capable of working
with third party direct digital controls.
71
GUIDE SPECIFICATIONS — 548F036-120 (cont)
548F
12. Power Exhaust Accessory for EconoMi$erIV or
EconoMi$er2:
Power exhaust shall be used in conjunction with
EconoMi$erIV or EconoMi$er2 to provide system
exhaust of up to 100% of return air (vertical only).
The power exhaust is a field-installed accessory
(separate vertical and horizontal design).
NOTE: Horizontal power exhaust is intended to
mount in return ductwork.
As the outdoor-air damper opens and closes, both
propeller fans are energized and deenergized
through the EconoMi$erIV controller. The set point is
factory set at 100% of outdoor-air, and is adjustable
0 to 100% to meet specific job requirements. Available in 208/230-1-60 v or 460-3-60 v. An LED light
on the controller indicates when the power exhaust
is operating.
For the EconoMi$er2, the power exhaust shall be
controlled by the third party controls.
13. Outdoor Air Enthalpy Sensor (EconoMi$erIV or
EconoMi$er2):
The outdoor air enthalpy sensor shall be used with
the EconoMi$erIV or EconoMi$er2 device to provide
single enthalpy control. When used in conjunction
with a return air enthalpy sensor, the unit will provide
differential enthalpy control. The sensor allows the
unit to determine if outside air is suitable for free
cooling.
14. Return Air Enthalpy Sensor (EconoMi$erIV or
EconoMi$er2):
The return air enthalpy sensor shall be used with the
EconoMi$erIV or EconoMi$er2 device. When used
in conjunction with an outdoor air enthalpy sensor,
the EconoMi$erIV or EconoMi$er2 device will provide differential enthalpy control.
15. Return Air Temperature Sensor (EconoMi$erIV or
EconoMi$er2):
The return air temperature sensor shall be used with
the EconoMi$erIV or EconoMi$er2 device. When
used in conjunction with the standard outdoor air
temperature sensor, the EconoMi$erIV or
EconoMi$er2 device will provide differential temperature control.
16. Outdoor Air/Return Air Temperature Sensor (adjustable) (EconoMi$er2):
Optional sensor uses the third party control to control
outdoor air damper and compressor operation.
17. Indoor Air Quality (CO
a. Sensor shall have the ability to provide demand
ventilation indoor air quality (IAQ) control through
the EconoMi$er2 with an IAQ sensor.
b. The IAQ sensor shall be available in duct moun t,
wall mount, and wall mount with LED display. The
set point shall have adjustment capability.
c. Requires EconoMi$er2 third party control options.
18. Outdoor Coil Hail Guard Assembly:
Hail guard shall protect against damage from hail
and flying debris.
19. Indoor Air Quality (CO
(EconoMi$erIV):
Sensor shall have the ability to provide demand ventilation control through the EconoMi$erIV. The IAQ
) Sensor:
2
) Room Sensor
2
sensor shall be wall mounted with an LED display in
parts per million. The set point shall have adjustment
capability.
20. Return Air CO
Sensor (EconoMi$erIV):
2
Sensor shall have the ability to provide demand ventilation control through the EconoMi$erIV. The IAQ
sensor shall be duct mounted. The set point shall
have adjustment capability.
21. Alternate Motors and/or Drives (036-060,090,120):
Alternate motors and drives shall be factory-installed
to provide additional performance range.
22. High-Static Motor(s) and Drive(s):
High-static motor(s) and drive(s) shall be factory-
installed to provide an additional performance range.
23. Outdoor Coil Grille:
The grille protects the outdoor coil from damage by
large objects without increasing unit clearances.
24. Compressor Cycle Delay:
Unit shall be prevented from restarting for a mini-
mum of 5 min. after shutdown.
25. Louvered Hail Guard:
The hail guard shall protect the entire outdoor coil
surface from direct or indirect (from adjacent surfaces) hail damage. Hail guard shall have a pressure
drop of 2%.
26. Fan/Filter Status Switch:
Switch shall provide status of evaporator fan (ON/
OFF) or filter (CLEAN/DIRTY). Status shall be displayed over communication bus when used with
direct digital controls or with an indicator light at the
thermostat.
27. Unit-Mounted Disconnect Switch:
Switch shall be factory-installed. Internally mounted,
NEC and UL approved non-fused switch provides
unit power shutoff. Switch shall be accessible from
outside the unit.
28. Convenience Outlet:
Outlet shall be factory-installed and internally
mounted with easily accessible 115-v female receptacle. Outlet shall include 15 amp GFI receptacle
with independent fuse protection. Voltage required to
operate convenience outlet shall be provided by a
factory-installed step-down transformer. Outlet shall
be accessible from outside the unit.
NOTE: Convenience outlet shall be designed for
short duration electrical maintenance loads and is
not designed for long term electrical supply.
29. Emergency Heat Package:
When mechanical heating is locked out, auxiliary
heat shall be activated when necessary.
30. Ultra-Violet Germicidal Lamps:
Ultra-violet germicidal lamps are designed to elimi-
nate odor causing mold and fungus that may
develop in the wet area of the indoor section of the
unit. The high output, low temperature germicidal
lamps are field installed in the indoor section of the
unit, aimed at the indoor coil and condensate pan.
The short wavelength ultra-violet light inhibits and
kills mold, fungus and microbial growth. The lamps
have an output rating at 45 F in 400 fpm airflow
of 120 microwatts/cm
2
at 1 meter.
72
549B, 549C
PHYSICAL DATA — 549B036-072
UNIT SIZE 549B036048060072
NOMINAL CAPACITY (tons)3456
Rows...Fins/in.2...153...154...154...15
Total Face Area (sq ft)5.55.57.337.33
INDOOR FANCentrifugal Type
Quantity...Size (in.)Std1...10 x 101...10 x 101...10 x 101...10 x 10
Type DriveStdBeltBeltBeltBelt
Nominal Cfm1200160020002400
Maximum Continuous BhpStd1.201.201.30/2.40*2.40
Motor Frame SizeStd48485656
Nominal Rpm High/LowStd162016201725—
Fan Rpm RangeStd680-1044770-11851035-14601119-1585
Motor Bearing TypeBallBallBallBall
Maximum Allowable Rpm2100210021002100
Motor Pulley Pitch Diameter Min/Max (in.)Std1.9/2.91.9/2.92.4/3.42.4/3.4
High-Static1...10 x 101...10 x 101...10 x 101...10 x 10
High-StaticBeltBeltBeltBelt
Fan Pulley Pitch Diameter (in.)Std4.54.04.53.7
Belt, Quantity...Type...Length (in.)Std1...A...341...A...341...A...391...A...40
Pulley Center Line Distance (in.)Std10.0-12.410.0-12.414.7-15.514.7-15.5
Speed Change per Full Turn of
Movable Pulley Flange (rpm)Std48708080
Movable Pulley Maximum Full Turns
From Closed PositionStd5565
Factory SettingStd3333
Factory Speed Setting (rpm)Std82693612491305
Rows...Fins/in.2...172...172...17
Total Face Area (sq ft)20.525.125.1
OUTDOOR FANPropeller
Quantity...Diameter (in.)2...222...222...22
Nominal Cfm650065006500
Motor Hp...Rpm
INDOOR COIL
Rows...Fins/in.3...154...154...15
Total Face Area (sq ft)8.911.111.1
1
/4...1100
Enhanced Copper Tubes, Aluminum Double-Wavy Fins,
Fixed Orifice Metering Device
1
/4...1100
1
/4...1100
INDOOR FANCentrifugal Type
Quantity...Size (in.)Standard1...15 x 151...15 x 151...15 x 15
Type DriveStandardBeltBeltBelt
Nominal Cfm 300034004000
Maximum Continuous BhpStandard2.902.903.70
Motor Frame SizeStandard565656
Nominal RpmStandard172517251725
Fan Rpm RangeStandard730-950840-1085860-1080
Motor Bearing TypeBallBallBall
Maximum Allowable Rpm210021002100
Motor Pulley Pitch Diameter Min/Max (in.)Standard3.4/4.43.4/4.44.0/5.0
Nominal Motor Shaft Diameter (in.)Standard
Fan Pulley Pitch Diameter (in.)Standard8.07.08.0
Belt, Quantity...Type...Length (in.)Standard1...A...511...A...511...A...53
Pulley Center Line Distance (in.)Standard16.75-19.2516.75-19.2515.85-17.50
Speed Change per Full Turn of
Rows...Fins/in.1...172...172...172...17
Total Face Area (sq ft)14.5816.5316.5321.25
INDOOR FANCentrifugal Type
Quantity...Size (in.)
Type Drive
Nominal Cfm800120016002000
Maximum Continuous Bhp
Motor Frame Size
Nominal Rpm High/Low
Fan Rpm Range
Motor Bearing TypeBallBallBallBall
Maximum Allowable Rpm2100210021002100
Motor Pulley Pitch Diameter Min/Max (in.)
Nominal Motor Shaft Diameter (in.)
Fan Pulley Pitch Diameter (in.)
Belt, Quantity...Type...Length (in.)
Pulley Center Line Distance (in.)
Speed Change per Full Turn of
Movable Pulley Flange (rpm)
Movable Pulley Maximum Full Turns
From Closed Position
Factory Setting
Factory Speed Setting (rpm)
Fan Shaft Diameter at Pulley (in.)
Std1...10 x 101...10 x 101...10 x 101...10 x 10
High-Static—1...10 x 101...10 x 101...10 x 10
StdBeltBeltBeltBelt
High-Static—BeltBeltBelt
Rows...Fins/in.2...152...153...154...15
Total Face Area (sq ft)5.55.55.57.33
HIGH–PRESSURE SWITCH (psig)
Standard Compressor Internal Relief 625
Cutout428
Reset (Auto.)320
LOSS OF CHARGE
(Liquid Line) (psig)
Cutout7 ± 3
Reset (Auto.)22 ± 5
FREEZE PROTECTION THERMOSTAT
Opens (F)30
Closes (F)45
OUTDOOR-AIR INLET SCREENSCleanable
RETURN–AIR FILTERSThrowaway
Quantity...Size (in.)2...16 x 25 x 2
LEGEND
Bhp — Brake Horsepower
*Single phase/three phase.
1
/8...760
1
/
2
5
/
8
1
/8...825
1
/
5
/
1
5
/
2
8
/
2
8
1
/8...825
1
/
5
/
31/
5
/
2
8
2
8
Screen quantity and size varies with option selected
1
/4...1100
5
/
8
5
/
8
31/
5
/
8
2
75
BASE UNIT DIMENSIONS
549B036-072
a50-8054
549B, 549C
76
BASE UNIT DIMENSIONS (cont)
549B, 549C
549B090-120
a50-8055
77
BASE UNIT DIMENSIONS (cont)
549B, 549C
549C024-060
a50-8097
78
ACCESSORY DIMENSIONS
ROOF CURB
ACCESSORY
AUNIT SIZE
CRRFCURB001A01
1′-2″
[356]
549B, 549C
024-072
CRRFCURB002A01
2′-0″
[610]
NOTES:
1. Roof curb accessory is shipped disassembled.
2. Insulated panels.
3. Dimensions in [ ] are in millimeters.
4. Roof curb: galvanized steel.
5. Attach ductwork to curb (flanges of duct rest on
curb).
6. Service clearance: 4 ft on each side.
7. Direction of airflow.
8. Connector packages CRBTMPWR001A01 and
002A01 are for thru-the-curb type gas. Packages
CRBTMPWR003A01 and 004A01 are for thru-thebottom type gas connections.
Enter Cooling Capacities table at outdoor entering temperature of 95 F, indoor air entering at 1600 cfm and
67 F ewb. The 549B048 unit will provide a total cooling
capacity of 46,300 Btuh and a sensible heat capacity of
35,600 Btuh.
For indoor-air temperature other than 80 F edb, calculate
sensible heat capacity correction, as required, using the
formula found in Note 3 following the cooling capacities
tables.
NOTE: Unit ratings are gross capacities and do not
include the effect of indoor-fan motor heat. To calculate
net capacities, see Step V.
III SELECT ELECTRIC HEAT.
Enter the Instantaneous and Integrated Heating Ratings
table at 1600 cfm. At 70 F return indoor air and 0° F air
entering outdoor coil, the integrated heating capacity is
22,400 Btuh. (Select integrated heating capacity value
since deductions for outdoor-coil frost and defrosting have
already been made. No correction is required.)
The required heating capacity is 35,000 Btuh. Therefore,
12,600 Btuh (35,000 – 22,400) additional electric heat is
required.
Determine additional electric heat capacity in kW.
Enter the Electric Heating Capacities table for 549B048 at
208/230, 3 phase. The 6.5-kW heater at 240 v most
closely satisfies the heating required. To calculate kW at
230 v, use the Multiplication Factors table.
6.5 kW x .92 = 5.98 kW
6.5 kW x .92 x 3413 = 20,410 Btuh
Total unit heating capacity is 42,810 Btuh (22,400 +
20,410).
IV DETERMINE FAN SPEED AND POWER REQUIRE-
MENTS AT DESIGN CONDITIONS.
Before entering Fan Performance tables, calculate the
total static pressure required based on unit components.
From the given and the Pressure Drop tables, find:
External static pressure.45 in. wg
EconoMi$erIV.07 in. wg
Electric heat.09 in. wg
Total static pressure.61 in. wg
Enter the Fan Performance table for 549B048 vertical discharge at 1600 cfm and .61 in. wg static pressure. The
bhp is 0.79 and the watts are 781. The rpm is 997. The
standard motor will adequately handle job requirements.
V DETERMINE NET CAPACITIES.
Capacities are gross and do not include the effect of
indoor-fan motor (IFM) heat.
Determine net cooling capacity as follows:
Net capacity = Total capacity – IFM heat
= 46,300 Btuh – (781 Watts x 3.413
Btuh/Watts)
= 46,300 Btuh – 2665 Btuh
= 43,635
Net sensible capacity= 35,600 Btuh – 2665 Btuh
= 32,935 Btuh
Integrated heating capacity is maximum (instantaneous)
capacity less the effect of frost on the outdoor coil and the
heat required to defrost it. Therefore, net capacity is equal
to 42,810 Btuh, the total heating capacity determined in
Step III.