SINGLE-PACKAGED
GAS HEATING/ELECTRIC
COOLING UNITS
UNIT 574B
Single-Packaged Rooftop Products with Energy-Saving Features and Puron® refrigerant.
• Direct Spark Ignition
• Low Sound Levels
• Up to 81% AFUE
• 13 SEER
• Variable Speed Blower Standard
• Factory Installed TXV
FEATURES/BENEFITS
One-piece heating and cooling units with low sound levels, easy
installation, low maintenance, and dependable performance.
Puron® Environmentally Sound Refrigerant
unique refrigerant designed to help protect the environment.
Puron is an HFC refrigerant which does not contain chlorine that
can harm the ozone layer. The most important advantage of
Puron refrigerant is that it has not been banned in future air conditioning systems as the traditional refrigerant R-22 has been.
Puron refrigerant is in service in thousands of systems proving
highly reliable, environmentally sound performance.
Perfect Heat, Perfect Humidity™ featuring Variable Speed
Blower motors
You can expect up to 30 times better dehumidification; economical constant fan for less than $50 a year, which provides improved
indoor air quality and more even temperatures from room to room;
and reduced indoor noise due to lower air velocity. In addition,
you’ll realize improved installation flexibility with 3 different airflow
choices for best overall comfort.
provides better comfort and energy efficiency.
is Bryant’s
Model 574B
Sizes 024-060
2 to 5 Nominal Tons
Low NOx Models Available
EASY INSTALLATION
pact, fully self-contained, combination gas heating/electric cooling unit that is pre-wired, pre-piped, and pre-charged for
minimum installation expense.
These units are available in a variety of standard and optional
heating/cooling size combinations with voltage options to meet
residential and light commercial requirements. Units are lightweight and install easily on a rooftop or at ground level. The high
tech composite unit base eliminates rust problems associated
with ground level applications.
CONVERTIBLE DUCT CONFIGURATION
for easy use in either downflow or horizontal applications. Each
unit is easily converted from horizontal to downflow.
EFFICIENT OPERATION
High-efficiency design
ciency Ratios) of 13.0 and AFUE (Annual Fuel Utilization Efficiency) ratings as high as 81%.
Energy-saving, direct spark ignition
only when the room thermostat calls for heating. Standard units
are furnished with natural gas controls. A low-cost field-installed
kit for propane conversion is available for all units.
574B units with an “N” in the thirteenth position of model #
are dedicated Low NOx units
tions. These models meet the California maximum oxides of nitrogen (NOx) emissions requirement of 40 nanograms/joule or
less as shipped from the factory and MUST be installed in California Air Quality Management Districts where a Low NOx rule
exists.
DURABLE, DEPENDABLE COMPONENTS
Compressors
sor is hermetically sealed against contamination to help promote
longer life and dependable operation. Each compressor also has
vibration isolation to provide quieter operation. All compressors
have internal high pressure and overcurrent protection.
Monoport inshot burners
which provides for clean and efficient combustion. The large
monoport on the inshot (or injection type) burners seldom, if
ever, requires cleaning. All gas furnace components are accessible in one compartment.
Turbo-tubular™ heat exchangers
nized steel for corrosion resistance and optimum heat transfer
for improved efficiency. The tubular design permits hot gases to
make multiple passes across the path of the supply air.
In addition, dimples located on the heat exchanger walls force
the hot gases to stay in close contact with the walls, improving
heat transfer.
Direct-drive variable speed (ECM) blower motor
on all 574B models.
Direct-drive, PSC condenser-fan motors
reduce energy consumption and provide for cooling operation
down to 55°F outdoor temperature. Motormaster® II low ambient
kit is available as a field-installed accessory.
are designed for high efficiency. Each compres-
—Factory-assembled package is a com-
—Unit is designed
offers SEER (Seasonal Energy Effi-
saves gas by operating
designed for California installa-
produce precise air-to-gas mixture,
are constructed of alumi-
is standard
are designed to help
Form No. PDS 574B.24.1
P
P
Corporate thermostats include the Time Guard® II anti-short
cycle protection circuitry. If a non-corporate thermostat without
anti-short cycle protection is used the Time Guard II field installed anti-short cycle kit is recommended.
Refrigerant system is designed to provide dependability. Liquid
filter dryers are used to promote clean, unrestricted operation.
Each unit leaves the factory with a full refrigerant charge. Refrigerant service connections make checking operating pressures
easier.
HIGH AND LOW PRESSURE SWITCHES
provide added reli-
ability for the compressor.
Evaporator and condenser coils
are computer-designed for
optimum heat transfer and cooling efficiency. The evaporator
coil is fabricated from copper tube and aluminum fins and is located inside the unit for protection against damage. The condenser coil is internally mounted on the top tier of the unit.
Copper fin coils and pre-coated fin coils are available from the
factory by special order. These coils are recommended in applications where aluminum fins are likely to be damaged due to
corrosion. They are ideal for seacoast applications.
Low sound ratings
ensure a quiet indoor and outdoor environ-
ment with sound ratings as low as 72 dB. (See page 3.)
Easy to service cabinets provide easy single-panel accessibility
to serviceable components during maintenance and installation.
The unit base with integrated drain pan provides easy ground level installation with or without a mounting pad. Convenient rigging
holds are provided to manipulate the unit on the jobsite. A nesting
feature ensures a positive unit base to roof curb seal when the unit
is roof mounted. A convenient 3/4-in. wide perimeter flange
makes frame mounting on a rooftop easy.
Standard metal duct covers with insulation come with the unit
and cover the horizontal duct openings. These can be left in place
if the units are converted to downflow.
Downflow operation is easily provided in the field to allow ver-
tical ductwork connections. The basepan utilizes knockout style
seals on the bottom openings to ensure a positive seal in the
horizontal airflow mode.
Integrated Gas Control (IGC) board provides safe and efficient
control of heating and simplifies trouble-shooting through its
built-in diagnostic function.
Cabinets are constructed of heavy-duty, phosphated, zinc-
coated prepainted steel capable of withstanding 500 hours in
salt spray. Interior surfaces of the evaporator/heat exchanger
compartment are insulated with cleanable semi-rigid insulation
board, which keeps the conditioned air from being affected by
the outdoor ambient temperature and provides improved indoor
air quality. (Conforms to American Society of Heating, Refrigeration and Air Conditioning Engineers No. 62P.) The sloped drain
pan minimizes standing water in the drain, which is provided with
an external drain fitting.
Louvered Grille
provides hail and vandalism protection.
574B N W 024 040 N VS
Model Number
574B – Single
Packaged Gas
Heating/Electric
Cooling
Electrical Supply
N – 208/230-1-60
– 208/230-3-60
Fuel
W – Natural Gas
– Propane Gas
Nominal Cooling Capacity
024 – 2 ton
030 – 2.5 ton (not yet available)
036 – 3 ton
042 – 3.5 ton (not yet available)
048 – 4 ton
060 – 5 ton
MODEL NUMBER NOMENCLATURE
Options
BT
– AL evap, vinyl condens
CC
– AL evap, CU condens
CU
– CU evap & condens
TP
– Base unit with tin plated indoor coil
TV
– TP with vinyl coating on outdoor coil
TC
– TP with AL indoor coil and CU/CU
Only used if ordering an option
Low NO
N
– Low NO
Only used if ordering NO
Heat Input Size
040 – 40,000
060 – 60,000
090 – 90,000
115 – 115,000
130 – 130,000
hair pins
outdoor coil
Indicator
x
Unit
x
units
x
CU
— Copper
AL
— Aluminum
LEGEND
—2—
db
wb
ARI* CAPACITIES
COOLING CAPACITIES AND EFFICIENCIES
UNIT 574B NOMINAL TONS STANDARD CFM
024040
030040
036060
036060
036090
042060
042090
048090
048115
048130
060090
060115
060130
LEGEND
dB — Decibels
— Dry Bulb
SEER — Seasonal Energy Efficiency Ratio
— Wet Bulb
* Air Conditioning & Refrigeration Institute.
† Rated in accordance with U.S. Government DOE (Department of
Energy) test procedures and/or ARI Standard 210/240-89.
‡“A” conditions — 80°F db/67°F wb Indoor and 95°F db outdoor
** Tested in accordance with ARI Standard 270-95 (not listed in ARI).
2 800 24,000 11.0 13.0 72
2-1/2
3 1150 36,000 11.0 13.0 72
3-1/2 11.0
4 1450 45,000 11.0 13.0 78
5 1750 57,000 11.0 13.0 78
NET COOLING
CAPACITIES (Btuh)
NOTES:
1. Ratings are net values, reflecting the effects of circulating fan heat.
Ratings are based on:
Cooling Standard: 80°F db, 67°F wb indoor entering-air tempera-
ture and 95°F db outdoor entering-air temperature.
2. Before purchasing this appliance, read important energy cost and
efficiency information available from your retailer.
EER
@A‡
SEER†
SOUND RATINGS**
(dB)
TABLE OF CONTENTS
Page
Features/Benefits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1,2
Model Number Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . 2
ARI Capacities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3,4
Physical Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5,6
Options and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7,8
Base Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9,10
Accessory Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Selection Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-18
Typical Piping and Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Application Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Typical Wiring Schematics. . . . . . . . . . . . . . . . . . . . . . . . . 22,23
Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Guide Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27,28
—3—
ARI* CAPACITIES (cont)
HEATING CAPACITIES AND EFFICIENCIES
UNIT 574B
024040
030040
030060
036060
042060
036090
042090
048090
060090
048115
060115
048130
060130
HEATING INPUT
(Btuh)
40,000 31,000 20-50 80.1
60,000
90,000
90,000
90,000
90,000
115,000 92,000 35-65 81.1
130,000
OUTPUT CAPACITY
(Btuh)
46,000
46,000
47,000
70,000
71,000
70,000
70,000
104,000
103,000
TEMPERATURE RISE
RANGE (°F)
35-65
25-55
20-50
45-75
35-65
25-55
25-55
40-70 80.3
LEGEND
AFUE — Annual Fuel Utilization Efficiency
NOTE: Before purchasing this appliance, read important energy cost and efficiency information available from your retailer.
T
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D
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A
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F
I
I
T
A
R
S
E
C
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R
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A
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U
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A
5
2
3
2
A
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A
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A
M
I
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O
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R
A
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W
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H
T
Q
N
U
E
I
P
M
0
1
2
D
A
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N
A
D
AFUE
78.4
78.7
78.7
79.9
79.9
78.6
78.6
OUTDOOR SOUND: OCTAVE BAND DATA — DECIBELS (Lw(A))
MODEL NO. 574B
Frequency (Hz) 024 030 036 042 048 060
125
250
500
1000
2000
4000
8000
57.5 — 60.7 — 62.4 64.1
61.1 — 63.3 — 69.9 68.6
68.0 — 66.8 — 71.3 71.2
68.4 — 66.5 — 73.4 73.9
64.5 — 64.2 — 70.0 69.8
59.0 — 60.3 — 66.3 68.1
51.7 — 53.0 — 60.1 61.8
—4—
1
PHYSICAL DATA
UNIT SIZE 574B 024040 030040 030060 036060 036090 042060 042090
NOMINAL CAPACITY (ton)
OPERATING WEIGHT (lb)
COMPRESSORS
Quantity
REFRIGERANT (R-410A)
Quantity (lb)
REFRIGERANT METERING DEVICE
Indoor
CONDENSER COIL
Rows—Fins/in.
Face Area (sq ft)
CONDENSER FAN
Nominal Cfm
Diameter (in.)
Motor Hp (Rpm)
EVAPORATOR COIL
Rows—fins/in.
Face Area (sq ft)
EVAPORATOR BLOWER
Nominal Airflow (Cfm)
Size (in.)
Motor Hp (Rpm)
FURNACE SECTION*
Burner Orifice No. (Qty…Drill Size)
Natural
Burner Orifice No. (Qty…Drill Size)
Propane
HIGH-PRESSURE SWITCH (psig)
Cutout
Reset (Auto.)
LOSS-OF-CHARGE/LOW-PRESSURE SWITCH
(Liquid Line) (psig)
Cutout
Reset (Auto.)
RETURN-AIR FILTERS (in.)†
Throwaway
†
Required filter sizes shown are based on the larger of the ARI (Air Conditioning & Refrigeration Institute) rated cooling air-
flow or the heating airflow velocity of 300 ft/min for throwaway type or 450 ft/min for high-capacity type. Air filter pressure
drop for non-standard filters must not exceed 0.08 in. wg.
*
Based on altitude of 0 to 2000 ft.
2 2-1/2 2-1/2 3 3 3-1/2 3-1/2
350 388 388
Scroll
7.3 9.5 9.5
TXV
2/21
11.95
2350
22
1/8 (825)
3/15
3.7
800
10 x 10
1/2
2…44
2…50
20 x 24 x 1 20 x 24 x 1 20 x 24 x 1 20 x 24 x 1 20 x 24 x 1 24 x 30 x 1 24 x 30 x 1
2/21
13.7
2350
22
1/8 (825)
4/15
3.7
1150
11 x 10
3/4
2…38
2…46
610 ± 15
420 ± 25
20 ± 5
45 ± 10
2/21
13.7
2350
22
1/8 (825)
4/15
3.7
1150
11 x 10
3/4
3…38
3…46
—5—
PHYSICAL DATA (cont)
UNIT SIZE 574B 048090 048115 048130 060090 060115 060130
NOMINAL CAPACITY (ton)
OPERATING WEIGHT (lb)
COMPRESSORS
Quantity
REFRIGERANT (R-410A)
Quantity (lb)
REFRIGERANT METERING DEVICE
Indoor
CONDENSER COIL
Rows—Fins/in.
Face Area (sq ft)
CONDENSER FAN
Nominal Cfm
Diameter (in.)
Motor Hp (Rpm)
EVAPORATOR COIL
Rows—fins/in.
Face Area (sq ft)
EVAPORATOR BLOWER
Nominal Airflow (Cfm)
Size (in.)
Motor Hp (Rpm)
FURNACE SECTION**
Burner Orifice No. (Qty…Drill Size)
Natural Gas
Burner Orifice No. (Qty…Drill Size)
Propane Gas
HIGH-PRESSURE SWITCH (psig)
Cutout
Reset (Auto.)
LOSS-OF-CHARGE/LOW-PRESSURE SWITCH
(Liquid Line) (psig)
Cutout
Reset (Auto.)
RETURN-AIR FILTERS (in.)
Throwaway†
Required filter sizes shown are based on the larger of the ARI (Air Conditioning & Refrigeration Institute) rated cooling air-
†
flow or the heating airflow velocity of 300 ft/min for throwaway type or 450 ft/min for high-capacity type. Air filter pressure
drop for non-standard filters must not exceed 0.08 in. wg.
Based on altitude of 0 to 2000 ft.
**
444555
463 463 463 499 499 499
Scroll
11.25 11.25 11.25 13.5 13.5 13.5
TXV
2/21 2/21 2/21 2/21 2/21 2/21
17.4 17.4 17.4 19.3 19.3 19.3
3300
22
1/4 (1100)
4/15
4.7
1400
11 x 10
3/4
3…38
3…46
24 x 30 x 1 24 x 30 x 1 24 x 30 x 1 24 x 30 x 1 24 x 30 x 1 24 x 30 x 1
3300
22
1/4 (1100)
4/15
4.7
1400
11 x 10
3/4
3…33
3…42
3300
22
1/4 (1100)
4/15
4.7
1400
11 x 10
3/4
3…31
3…41
610 ± 15
420 ± 25
20 ± 5
45 ± 10
3300
22
1/4 (1100)
4/17
5.7
1750
11 x 10
1.0
3…38
3…46
3300
22
1/4 (1100)
4/17
5.7
1750
11 x 10
1.0
3…33
3…42
3300
22
1/4 (1100)
4/17
5.7
1750
11 x 10
1.0
3…31
3…41
1
—6—
OPTIONS AND ACCESSORIES
Factory-installed options
Coil options include Tin-Plated* indoor hairpins, copper/copper
and vinyl-coated construction for refrigerant coils. Units are
shipped standard with copper tube/aluminum fin construction.
See model number nomenclature for coil options.
*Tin-Plated indoor coils are built with special hairpins that are designed to resist both general pitting corrosion and excessive indoor corrosion (Formicary Corrosion).
Field-installed accessories
Economizer with Solid-State Controls and Barometric Relief Dampers
Manual Air Damper (25% open)
Filter Rack
Roof Curbs (8-in. and 14-in.)
Square-to-Round Duct Transition Kit
Thermostats
Crankcase Heater
Compressor Hard Start Kit (for use on single-phase units only)
LP Conversion Kit
High Altitude Kit
Low Ambient Kit (Motormaster® II Control)
Solid-State Time Guard® II Device
Lifting Kit
LP to Natural Conversion Kit
Economizer with solid-state controls and barometric relief
dampers includes filter racks and provide outdoor air during
cooling and reduce compressor operation.
Manual outside air damper includes hood and filter rack with
adjustable damper blade for up to 25% outdoor air.
Flat roof curbs in both 8 in. and 14 in. sizes are available for
roof mounted applications.
Square-to-round duct transition kit enables 024-048 size
units to be fitted to 14 in. round ductwork.
Compressor hard start kit assists compressor start-up by providing additional starting torque on single phase units and prolongs compressor motor life.
Thermostats provide control for the system heating and cooling
functions. Thermostat models are available in both programmable and non-programmable versions.
Crankcase heater provides anti-floodback protection for lowload cooling applications.
LP (liquid propane) conversion kit allows for conversion from
natural gas to liquid propane fuel.
Low-ambient kit (Motormaster® II control) allows the use of
mechanical cooling down to outdoor temperatures as low as 0°F.
Solid-state Time Guard® II device provides short-cycling protection for the compressor. Not required with corporate electronic thermostats.
Filter rack features easy installation, serviceability, and highfiltering performance for vertical applications.
High altitude kit is for use at 2001 to 6000 ft above sea level.
Kit consists of natural gas orifices that compensate for gas heat
operation at high altitude.
LP to natural gas conversion kit allows conversion back to
natural gas.
Lifting kit includes rigging brackets which are inserted into the
unit base rigging holds to rig unit for rooftop applications.
—7—
Economizer
DOOR
LATCH ANGLE
HINGED FILTER
ACCESS DOOR
17 13/32
(442mm)
11 13/32”
(290mm)
INSTALL
FILTER ACCESS
DOOR STICKER
16 1/4”
(413mm)
FILTER ACCESS DOOR
(HORIZONTAL
APPLICATION ONLY.)
DO NOT REMOVE
FROM DOWNFLOW
DISCHARGE.
REPLACEMENT
PANEL
HOLE FOR
ECONOMIZER
WIRING HARDNESS
RAINHOOD
ALUMINUM
FILTER
A99315
Filter Rack
A99314
Manual Outside Air Damper
REPLACEMENT
PANEL
MANUAL OUTSIDE
AIR HOOD
DAMPER
BLADE
A99317
A99316
—8—
BASE UNIT DIMENSIONS — 574B024-036
REQ’D CLEARANCES FOR OPERATION AND SERVICING. in. (mm)
Evaporator coil access side ..................36(914)
Power entry side (except for NEC requirements) .........36(914)
Unit top ..........................48(1219)
Side opposite ducts .....................36(914)
Duct panel ........................12(304.8)*
*Minimum distances: If unit is placed less than 12 in. (304.8 mm) from wall
system, then the system performance may be compromised.
LEGEND
CG - Center of Gravity
COND - Condenser
EVAP - Evaporator
NEC - National Electrical Code
REQ'D - Required
Note: Dimensions are in in. (mm)
REQ’D CLEARANCES TO COMBUSTIBLE MAT’L. in. (mm)
Top of unit .........................14(355.6)
Duct side of unit .......................2(50.8)
Side opposite ducts .....................14(355.6)
Bottom of unit .......................0.50 (12.7)
Flue panel .........................36(914.4)
NEC REQ’D CLEARANCES. in. (mm)
Between units, power entry side ..............42(1066.8)
Unit and ungrounded surfaces, power entry side .........36(914)
Unit and block or concrete walls and other grounded
control box side
surfaces,
.................42(1066.8)
CENTER OF GRAVITY
IN. [MM]
UNIT
ELECTRICAL
CHARACTERISTICS
UNIT WEIGHT
lb. kg. X Y Z
UNIT HEIGHT
IN. [MM]
“A”
574B024040 208/230-1-60 350 159 39.02 [991.1] 20 [508] 19.3 [489] 17.6 [447]
574B030040/060 208/230-1-60
574B036060/090
208/230-1-60
208/230-3-60
388 176 41.02 [1041.9] 20 [508] 14 [355.6] 13 [330.2]
—9—
BASE UNIT DIMENSIONS – 574B042-060
C99074
REQUIRED CLEARANCE FOR OPERATION AND SERVICING
EVAP. COIL ACCESS SIDE..............................................................36.00 [914.0]
POWER ENTRY SIDE......................................................................36.00 [914.0]
(EXCEPT FOR NEC REQUIREMENTS)
UNIT TOP.........................................................................................36.00 [914.0]
SIDE OPPOSITE DUCTS ................................................................36.00 [914.0]
DUCT PANEL ...................................................................................12.00 [304.8] *
*MINIMUM DISTANCES: IF UNIT IS PLACED LESS THAN 12.00 [304.8] FROM
WALL SYSTEM, THEN SYSTEM PERFORMANCE MAYBE COMPROMISE.
in. [mm]
REQUIRED CLEARANCE TO COMBUSTIBLE MATL.
TOP OF UNIT...................................................................................14.00 [355.6]
DUCT SIDE OF UNIT.........................................................................2.00 [50.8]
SIDE OPPOSITE DUCTS ................................................................14.00 [355.6]
BOTTOM OF UNIT.............................................................................0.50 [12.7]
FLUE PANEL....................................................................................36.00 [914.4]
NEC. REQUIRED CLEARANCES.
BETWEEN UNITS, POWER ENTRY SIDE ....................................42.00 [1066.8]
UNIT AND UNGROUNDED SURFACES, POWER ENTRY SIDE ...36.00 [914.0]
UNIT AND BLOCK OR CONCRETE WALLS AND OTHER
GROUNDED SURFACES, POWER ENTRY SIDE.........................42.00 [1066.8]
FLUE
in. [mm]
MILLIMETERS [IN.]
UNIT
574B042060/090
574B048090/115/130
574B060090/115/130
ELECTRICAL
CHARACTERISTICS
208/230-1-60
208/230-3-60
208/230-1-60
208/230-3-60
208/230-1-60,
208/230-3-60,
UNIT WEIGHT
lb. kg. X Y Z
UNIT HEIGHT
IN. [MM]
“A”
CENTER OF GRAVITY
IN. [MM]
463 210 44.98 [1142.4] 19.5 [495.3] 17.6 [447.6] 18.0 [457.2]
499 226 46.98 [1193.3] 21 [533.4] 20 [508] 17.6 [447.0]
—10—
ACCESSORY DIMENSIONS
HVAC unit
base
Screw
(NOTE A)
*Gasketing
outer flange
Flashing field
supplied
Roofing material
field supplied
Cant strip
field supplied
*Provided with roofcurb
Gasketing
inner flange*
Wood nailer*
Roofcurb*
Insulation (field
supplied)
Duct work
field supplied
Roof
Roof Curb for Small Cabinet
Note A: When unit mounting screw is used,
retainer bracket must also be used.
Supply opening
(B x C)
5/16"
44
(1125.5mm)
B Typ.
C Typ.
HVAC unit
Screw
(NOTE A)
*Gasketing
outer flange
Flashing field
supplied
Roofing material
field supplied
Cant strip
field supplied
*Provided with roofcurb
base
Gasketing
inner flange*
Duct work
field supplied
Wood nailer*
Roofcurb*
Insulation (field
supplied)
Roof
Roof Curb for Large Cabinet
Note A: When unit mounting screw is used,
retainer bracket must also be used.
D
A
Short
Long
Support
Support
Return opening
(B X C)
Insulated
deck pan
Roof Curb Dimensions
Side View
UNIT SIZE ODS ORDER NUMBER
ROOF CURB
024-036
042-060
Notes:
1. Roof curb must be set up for unit being installed.
2. Seal strip must be applied as required to unit being installed.
3. Dimensions in [ ] are in millimeters.
4. Roof curb is made of 16 gage steel.
5. Table lists only the dimensions per part number that have changed.
6. Attach ductwork to curb (flanges of duct rest on curb).
7. Insulated panels: 1-in. thick fiberglass 1 lb. density.
8. Dimensions are in inches.
9. When unit mounting screw is used (Note A), a retainer bracket must be used as
well. This bracket must also be used when required by code for hurricane or
seismic conditions. This bracket is available through Micrometl.
CPRFCURB006A00 8 [203] 11 [279] 16 1/2 [419] 28 3/4 [730]
CPRFCURB007A00 14 [356] 11 [279] 16 1/2 [419] 28 3/4 [730]
CPRFCURB008A00 8 [203] 16 3/16 [411] 17 3/8 [441] 40 1/4 [1022]
CPRFCURB009A00 14 [356] 16 3/16 [411] 17 3/8 [441] 40 1/4 [1022]
R/A
Insulated
deck pan
A
IN. [MM]
Gasket around
duct
Gasket around
outer edge
B
IN. [MM]
C
IN. [MM]
S/A
C00076
D
IN. [MM]
—11—
574B CORNER WEIGHTS
12
y
43
CORNER # 024 030 036 042 048 060
1 70 78 92 100
254 60 7278
3 84 94 111 120
4 141 156 188 201
TOTAL WEIGHT 350 388 463 499
SELECTION PROCEDURE (WITH EXAMPLE)
I DETERMINE COOLING AND HEATING REQUIREMENTS
AT DESIGN CONDITIONS:
Given:
Required Cooling Capacity (TC)....................... 34,500 Btuh
Sensible Heat Capacity (SHC)......................... 26,000 Btuh
Required Heating Capacity............................... 60,000 Btuh
Condenser Entering Air Temperature...........................95°F
Indoor-Air Temperature ........................80°F edb 67°F ewb
Evaporator Air Quantity .....................................1200 CFM
External Static Pressure....................................... 0.2 in. wg
Electrical Characteristics.......................................230-1-60
II SELECT UNIT BASED ON REQUIRED COOLING
CAPACITY.
Enter Net Cooling Capacities table at condenser entering
temperature of 95 F. Unit 036 at 1225 cfm and 67 F ewb
(entering wet bulb) will provide a total capacity of 36,500
Btuh and a SHC of 27,600 Btuh. Calculate SHC correction,
if required, using Note 4 under Cooling Capacities tables.
III SELECT HEATING CAPACITY OF UNIT TO PROVIDE
DESIGN CONDITION REQUIREMENT.
In the Heating Capacities and Efficiencies table on page 4,
note that the unit 036090 will provide 70,000 Btuh with an
input of 90,000 Btuh.
x
IV DETERMINE FAN SPEED AND POWER REQUIRE-
MENTS AT DESIGN CONDITIONS.
Before entering the air delivery tables, calculate the total
static pressure required. From the given example, the Wet
Coil Pressure Drop Table, and the Filter Pressure Drop table
on page 16, find at 1200 cfm:
Wet Coil Pressure Drop 0.032 in. ws
External Static Pressure 0.2 in. wg
Filter Pressure Drop 0.13 in. wg
Total Static Pressure 0.362 in. wg
Enter the table for Dry Coil Air Delivery — Horizontal and
Downflow Discharge. At 0.362 ESP (external static
pressure), the fan will deliver 1235 cfm with the NOM Speed
pin selected.
V SELECT UNIT THAT CORRESPONDS TO POWER
SOURCE AVAILABLE.
The Electrical Data table shows that the unit is designed to
operate at 208/230-1-60.
—12—
574B024 COOLING PERFORMANCE TABLE
Temp (F)
Outdoor Air
Entering
Condenser
75
85
95
105
115
125
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
62 63* 67 72 62 63* 67 72 62 63* 67 72
24.0 24.5 26.5 29.1 24.6 25.1 27.1 29.8 25.1 25.5 27.4 30.4
21.9 21.3 18.7 15.4 23.5 22.8 19.8 16.1 25.0 24.2 20.8 16.7
1.7 1.7 1.8 1.8 1.8 1.8 1.8 1.8 1.8 1.8 1.8 1.9
22.9 23.3 25.3 27.9 23.5 23.9 25.8 28.5 23.9 24.3 26.2 28.9
21.4 20.7 18.1 14.9 22.9 22.2 19.2 15.6 24.3 23.6 20.3 16.2
1.9 1.9 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.1 2.1
21.8 22.2 24.0 26.5 22.3 22.6 24.5 27.0 22.7 23.0 24.8 27.4
20.8 20.2 17.6 14.3 22.3 21.6 18.7 15.0 23.6 22.9 19.7 15.6
2.2 2.2 2.2 2.2 2.2 2.2 2.2 2.2 2.2 2.2 2.3 2.3
20.5 20.9 22.6 25.0 21.0 21.3 23.0 25.4 21.6 21.7 23.3 25.7
20.2 19.5 16.9 13.7 21.6 20.9 18.0 14.3 22.5 22.2 19.0 14.9
2.4 2.4 2.4 2.4 2.4 2.4 2.5 2.5 2.5 2.5 2.5 2.5
19.2 19.5 21.1 23.3 19.8 19.9 21.5 23.7 20.7 20.4 21.7 23.6
19.4 18.8 16.3 13.0 20.6 20.2 17.3 13.7 21.5 21.2 18.3 14.1
2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.8 2.8
17.8 18.0 19.4 21.4 18.5 18.5 19.5 21.7 19.0 19.0 19.9 21.9
18.5 18.1 15.5 12.3 19.2 19.2 16.5 12.9 19.8 19.7 17.6 13.5
2.9 2.9 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.1 3.1
800/0.026 900/0.032 1000/0.04
PERFORMANCE DATA
STANDARD INDOOR ECM MOTOR
COOLING CAPACITIES
Evaporator Air — CFM / BF
Evaporator Air — Ewb (F)
574B030 COOLING PERFORMANCE TABLE
Temp (F)
Outdoor Air
Entering
Condenser
62 63* 67 72 62 63* 67 72 62 63* 67 72
75
85
95
105
115
125
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
See Legend and Notes on page 15.
Evaporator Air—CFM/BF
875/0.08 1000/0.09 1125/0.10
Evaporator Air — Ewb (F)
—13—
574B036 COOLING PERFORMANCE TABLE
Temp (F)
Outdoor Air
Entering
Condenser
62 63* 67 72 62 63* 67 72 62 63* 67 72
36.2 36.8 39.7 43.8 36.9 37.4 40.3 44.4 37.9 38.1 41.0 45.1
33.2 26.7 27.8 22.3 34.7 27.9 29.0 23.1 36.9 29.6 30.9 24.2
2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.8 2.8 2.8 2.8 2.9
34.6 35.1 37.9 41.8 35.3 35.6 38.4 42.4 36.4 36.3 39.1 43.1
32.4 26.0 27.1 21.6 34.0 27.1 28.3 22.4 35.6 28.9 30.2 23.6
2.9 2.9 3.0 3.0 3.0 3.0 3.0 3.0 3.1 3.1 3.1 3.2
33.0 33.4 36.0 39.7 33.7 33.8 36.5 40.2 34.8 34.4 37.0 40.8
31.6 25.3 26.4 20.9 32.9 26.4 27.6 21.7 34.4 28.1 29.4 22.8
3.2 3.2 3.3 3.3 3.3 3.3 3.3 3.4 3.4 3.4 3.4 3.5
31.3 31.5 34.0 37.5 32.1 31.9 34.3 37.9 33.1 32.4 34.9 38.4
30.6 24.5 25.6 20.1 31.5 25.7 26.8 20.9 32.8 27.3 28.6 22.0
3.6 3.6 3.6 3.6 3.6 3.6 3.7 3.7 3.8 3.7 3.8 3.8
29.6 29.4 31.8 35.0 30.4 29.8 32.1 35.4 31.3 30.3 32.6 35.8
29.3 23.7 24.8 19.3 30.0 24.8 26.0 20.0 31.0 26.4 27.7 21.1
4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.1 4.1 4.1 4.2
27.8 27.2 29.4 32.4 28.4 27.5 29.7 32.7 29.3 28.0 30.1 33.0
27.5 22.8 23.9 18.4 28.2 23.8 25.0 19.1 29.0 25.4 26.7 20.2
4.4 4.3 4.4 4.4 4.4 4.4 4.4 4.4 4.5 4.5 4.5 4.5
75
85
95
105
115
125
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
PERFORMANCE DATA (cont)
STANDARD INDOOR ECM MOTOR
COOLING CAPACITIES (cont)
Evaporator Air—CFM/BF
1100/0.06 1225/0.07 1400/0.08
Evaporator Air — Ewb (F)
574B042 COOLING PERFORMANCE TABLE
Temp (F)
Outdoor Air
Entering
Condenser
62 63* 67 72 62 63* 67 72 62 63* 67 72
TC
75
85
95
105
115
125
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
See Legend and Notes on page 15.
Evaporator Air—CFM/BF
1225/0.11 1400/0.12 1575/0.14
Evaporator Air — Ewb (F)
—14—
574B048 COOLING PERFORMANCE TABLE
Temp (F)
Outdoor Air
Entering
Condenser
62 63* 67 72 62 63* 67 72 62 63* 67 72
45.0 45.8 49.6 54.7 46.7 47.3 51.2 56.3 48.1 48.7 52.5 57.8
39.3 32.0 33.4 27.2 42.6 34.3 35.8 28.9 45.8 36.8 38.4 30.6
3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.5 3.4 3.4 3.4 3.5
42.8 43.6 47.2 52.1 44.3 44.9 48.6 53.5 45.6 46.1 49.9 54.8
38.2 30.9 32.3 26.2 41.3 33.2 34.7 27.7 44.3 35.5 37.3 29.4
3.7 3.7 3.8 3.8 3.7 3.7 3.8 3.8 3.8 3.8 3.8 3.8
40.6 41.3 44.7 49.4 41.8 42.4 46.0 50.7 44.2 43.7 47.0 51.8
36.9 29.8 31.2 25.2 39.9 32.0 33.6 26.7 43.0 34.6 36.1 28.3
4.1 4.1 4.2 4.2 4.1 4.1 4.2 4.2 4.2 4.1 4.2 4.2
38.2 38.9 42.1 46.4 39.6 39.8 43.1 47.6 41.5 40.8 44.0 48.5
35.7 28.7 30.1 24.0 38.3 30.7 32.3 25.5 40.0 33.2 34.8 27.0
4.6 4.6 4.6 4.6 4.6 4.6 4.6 4.7 4.6 4.6 4.6 4.7
35.7 36.3 39.3 43.3 38.2 37.1 40.1 44.2 38.7 37.9 40.8 45.0
34.4 27.5 28.9 22.9 35.7 29.5 31.0 24.3 38.2 31.8 33.5 25.8
5.0 5.0 5.1 5.1 5.1 5.0 5.1 5.1 5.1 5.1 5.1 5.1
33.4 33.4 36.2 39.4 34.6 34.1 36.9 40.5 36.1 34.8 37.5 41.2
32.1 26.2 27.6 21.5 33.8 28.2 29.7 22.9 35.6 30.2 31.9 24.4
5.6 5.6 5.6 5.7 5.6 5.6 5.6 5.6 5.6 5.6 5.6 5.6
75
85
95
105
115
125
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
PERFORMANCE DATA (cont)
STANDARD INDOOR ECM MOTOR
COOLING CAPACITIES (cont)
Evaporator Air—CFM/BF
1260/0.06 1400/0.06 1600/0.08
Evaporator Air — Ewb (F)
574B060 COOLING PERFORMANCE TABLE
Temp (F)
Outdoor Air
1500/0.004 1750/0.007 2000/0.01
Entering
Condenser
62 63* 67 72 62 63* 67 72 62 63* 67 72
57.2 58.2 62.4 68.1 58.8 59.7 64.0 69.8 60.0 60.8 64.9 70.8
49.4 47.9 41.6 33.8 53.6 51.8 44.5 35.4 57.6 55.4 47.1 36.8
4.1 4.1 4.2 4.2 4.2 4.3 4.3 4.4 4.4 4.4 4.5 4.6
54.7 55.6 59.7 65.2 56.2 57.0 61.1 66.6 57.4 58.1 61.9 67.4
48.2 46.7 40.4 32.6 52.4 50.5 43.2 34.2 56.3 54.2 45.8 35.6
4.5 4.5 4.6 4.7 4.7 4.7 4.8 4.9 4.8 4.9 5.0 5.0
52.2 53.0 56.9 62.0 53.5 54.3 58.0 63.2 55.0 55.3 58.7 64.1
47.0 45.4 39.2 31.4 51.1 49.2 41.9 32.9 55.0 52.9 44.5 34.4
5.0 5.0 5.1 5.2 5.1 5.2 5.3 5.3 5.2 5.3 5.5 5.5
49.4 50.2 53.8 58.7 50.7 51.4 54.8 59.6 52.5 52.4 55.4 60.2
45.7 44.1 37.9 30.1 49.8 47.9 40.6 31.6 52.5 51.6 43.2 33.0
5.5 5.6 5.6 5.7 5.7 5.7 5.8 5.9 5.8 5.8 6.0 6.1
46.5 47.2 50.5 55.0 48.1 48.3 51.3 56.8 49.7 49.7 51.8 57.0
44.3 42.7 36.4 28.7 48.1 46.6 39.2 30.6 49.7 49.7 41.8 31.7
6.1 6.2 6.2 6.3 6.2 6.3 6.4 6.4 6.4 6.4 6.6 6.6
43.3 43.9 46.7 52.2 45.2 45.1 47.4 52.5 46.4 46.4 47.9 52.2
42.8 41.2 34.9 27.8 45.2 45.1 37.6 28.9 46.4 46.4 40.2 29.7
6.7 6.8 6.8 6.8 6.8 6.9 7.0 7.0 7.0 7.0 7.2 7.2
75
85
95
105
115
125
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
TC
SHC
kW
LEGEND
BF — Bypass Factor
Ewb — Entering Wet-Bulb
kW — Total Unit Power Input
SHC — Sensible Heat Capacity (1000 Btuh)
TC — Cooling Capacity (1000 Btuh)
ECM — Electronic Computated Motor
* — TVA Conditions (75°F entering dry bulb)
NOTES:
1. Ratings are net; they account for the effects
of the evaporator-fan motor power and heat.
2. Direct interpolation is permissible. Do not extrapolate.
3. The following formulas may be used:
Evaporator Air — CFM/BF
Evaporator Air — Ewb (F)
t=t
ldb edb
t = Wet-bulb temperature corresponding to enthalpy of air leaving
lwb
evaporator coil (h )
h=h
lwb ewb
Where: h = Enthalpy of air entering evaporator coil
4. The SHC is based on 80°F edb temperature of air entering evaporator
coil. Below 80°F edb, subtract (Corr Factor x CFM) from SHC above
80°F edb, add (Corr Factor x CFM) to SHC Correction Factor = 1.10 x
—15—
(1 – BF) x (edb – 80)
sensible capacity (Btuh)
1.10 x cfm
lwb
total capacity (Btuh)
4.5 x cfm
ewb
FILTER PRESSURE DROP (In. wg)
FILTER SIZE
20 X 20 X 1 0.05 0.07 0.08 0.10 0.12 0.13 0.14 0.15 ———————————
20 X 24 X 1 ————0.09 0.10 0.11 0.13 0.14 0.15 0.16 ————————
24 X 30 X 1 ———————0.07 0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18
500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300
CFM
—16—
UNIT
SIZE
024
030
036
UNIT
SIZE
042
048
060
574B COOLING DRY COIL ECM AIRFLOW—SMALL CABINET
CFM ADJUST
PIN SELECT
EXTERNAL STATIC
PRESSURE RANGE
COOLING
COOLING
DEHUMIDIFY
COOLING
COOLING
DEHUMIDIFY
COOLING
COOLING
DEHUMIDIFY
574B COOLING DRY COIL ECM AIRFLOW—LARGE CABINET
CFM ADJUST
PIN SELECT
EXTERNAL STATIC
PRESSURE RANGE
COOLING
COOLING
DEHUMIDIFY
COOLING
COOLING
DEHUMIDIFY
COOLING
COOLING
DEHUMIDIFY
LO PIN NOM PIN HI PIN
0.0–0.39 0.4–0.69 0.7–1.0 0.0–0.39 0.4–0.69 0.7–1.0 0.0–0.39 0.4–0.69 0.7–1.0
745 675 — 835 750 690 940 880 815
675 625 — 675 650
940 860 785 1020 965 895 1185 1100 1010
820 785 735 820 800
1025 935 — 1145 1085 1005 1320 1260 1180
925 885 — 925 900
LO PIN NOM PIN HI PIN
0.1–1.0 0.1–1.0 0.1–1.0
1035 1095 1280
880 880 1025
1150 1285 1500
1025 1025 1200
1480 1630 1920
1305 1305 1535
600 755 730 705
770 955 920 880
870 1060 1040 1010
574B HEATING ECM AIRFLOW—SMALL CABINET
EASY SELECT™
BOARD SETTING (CFM)
UNIT
SIZE
024 040 ———855 770 710 ——————
030
036
EXTERNAL STATIC
PRESSURE
GAS HEAT SIZE
040 ———
060 ——————1030 970 910 ———
060 ——————
090 —————————1170 1110 1025
0.0–0.39 0.4–0.69 0.7–1.0 0.0–0.39 0.4–0.69 0.7–1.0 0.0–0.39 0.4–0.69 0.7–1.0 0.0–0.39 0.4–0.69 0.7–1.0
700 800 1100 1250
880 840
805 ——————
1035 995 955 ———
574B HEATING ECM AIRFLOW—LARGE CABINET
EASY SELECT™
BOARD SETTING (CFM)
UNIT
SIZE
042
048
060
EXTERNAL STATIC
PRESSURE
GAS HEAT SIZE
060
090
090
115
130
090
115
130
1000 1250 1600 1750 1800
0.0–1.0 0.0–1.0 0.0–1.0 0.0–1.0 0.0–1.0
1000 ————
— 1250 ———
— 1250 ———
——1600 ——
———1750 —
— 1250 ———
——1600 ——
————1800
—17—
574B ECM AIR FLOW VS. TEMPERATURE RISE CHART
UNIT COOLING SIZE
574B 024 40 800 36.5 20 50 175
574B 030 40 800 36.5 20 50 175
574B 030 60 1100 40 35 65 165
574B 036 60 1100 40 25 55 165
574B 036 90 1200 54 45 75 175
574B 042 60 1000 44 20 50 165
574B 042 90 1250 53 35 65 170
574B 048 90 1250 53 25 55 165
574B 048 115 1600 53 35 65 170
574B 048 130 1750 54 40 70 175
574B 060 90 1600 41 25 55 155
574B 060 115 1600 53 35 65 170
574B 060 130 1800 53 40 70 175
RATED GAS
INPUT RATE
(X 1000)
AIRFLOW SETTING
EAST SELECT™
(SCFM)
CALCULATED
TEMPERATURE
RISE
MIN.
TEMP
RISE
MAX
TEMP
RISE
MAX
DISCH.
TEMP
PERFORMANCE DATA (CONT)
ECONOMIZER/1-IN. FILTER PRESSURE DROP (in. wg)
UNIT 574B PRESSURE DROP
024-036 0.20
042-060 0.25
HIGH ALTITUDE COMPENSATION
NATURAL GAS ONLY
ORIFICE CONVERSION — 3.5 in. wc
MANIFOLD PRESSURE*
ALTITUDE (ft)
0-2000
2001-6000
* As the height above sea level increases, there is less oxygen per cubic ft of air.
Therefore, heat input rate should be reduced at higher altitudes.
† Orifices available through your Bryant distributor.
INPUT
(Btuh)
40,000 31,000 #44
60,000 46,000 #38
90,000 70,000 #38
115,000 92,000 #33
130,000 103,000 #31
32,075 24,858 #48
48,547 37,219 #42
72,820 56,638 #42
90,094 72,075 #37
102,630 81,315 #34
OUTPUT
(Btuh)
ORIFICE
NUMBER†
574B ECM WET COIL PRESSURE DROP
UNIT
SIZE
024 0.005
030 —
036
042
048
060
600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100
0.007 0.010 0.012 0.015 ———————————
0.007 0.010 0.012 0.015 0.018 0.021 0.024 ————————
———0.019 0.023 0.027 0.032 0.037 0.042 0.047 ——————
————0.014 0.017 0.020 0.024 0.027 0.031 0.035 0.039 0.043 ———
— —————0.027 0.032 0.036 0.041 0.046 0.052 0.057 0.063 0.068 —
— ————————0.029 0.032 0.036 0.040 0.045 0.049 0.053
STANDARD CFM
ORIFICE CONVERSION — 3.5 in. wc
ALTITUDE (ft)
0-2000
2001-6000
LIQUID PROPANE ONLY
MANIFOLD PRESSURE*
INPUT
(Btuh)
40,000 31,000 #50
57,000 43,720 #46
85,500 66,520 #46
115,000 92,000 #42
127,000 100,580 #41
33,834 26,221 #52
49,238 37,766 #48
73,856 57,461 #48
94,571 75,657 #44
101,284 80,214 #43
OUTPUT
(Btuh)
ORIFICE
NUMBER†
—18—
ROOF-MOUNTING
CURB
SUPPLY-AIR
FLEXIBLE DUCT
TYPICAL PIPING AND WIRING
ROOF
RETURN-AIR
FLEXIBLE DUCT
CONCENTRIC DIFFUSER BOX
(FIELD-SUPPLIED)
TOP COVER
CEILING
C00023
INDOOR
THERMOSTAT
RETURN
AIR
FROM
POWER
SOURCE
—19—
FROM
GAS LINE
*NEC - NATIONAL ELECTRICAL CODE
DISCONNECT
PER NEC*
C00022
APPLICATION DATA
Condensate trap — A 2-in. condensate trap must be field
supplied.
1” MIN.
TRAP
OUTLET
2” MIN.
Ductwork — Secure downflow discharge ductwork to roof
curb. For horizontal discharge applications, attach
ductwork to unit with flanges.
To convert a unit to downflow discharge — Units are
equipped with factory-installed inserts in the down-flow
openings. Removal of the inserts is similar to removing an
electrical knock-out. The unit is factory equipped with duct
covers to seal the horizontal discharge openings in the
unit. Units installed in horizontal discharge orientation do
not require duct covers.
Maximum cooling airflow — To minimize the possibility
of condensate blow-off from the evaporator, airflow
through the units should not exceed 450 cfm per ton.
Minimum cooling airflow — The minimum cooling
airflow is 350 cfm per ton.
Minimum cooling ambient operating temperature — All
standard units have a minimum cooling ambient operating
temperature of 55°F. With accessory low ambient
temperature kit, units can operate at temperatures down to
0°F.
Maximum operating outdoor air temperature — for
cooling is 125°F.
—20—
ELECTRICAL DATA
574B (STANDARD) ELECTRICAL DATA
UNIT
SIZE
574B
024 208/230–1–60 187 253 13.5 61.0 0.8 4.3 22.0/22.0 30/30
030 208/230–1–60 187 253 16.9 73.0 0.8 4.3 25.0/25.0 30/30
036
042
048
060
V-PH-Hz
208/230–1–60 187 253 15.9 83.0 0.8 6.8 28.7/28.7 35/35
208/230–3–60 187 253 12.2 77.0 0.8 6.8 22.9/22.9 30/30
208/230–1–60 187 253 22.4 105.0 0.8 6.8 35.6/35.6 45/45
208/230–3–60 187 253 15.4 88.0 0.8 6.8 26.9/26.9 35/35
208/230–1–60 187 253 21.3 109.0 1.6 6.8 35.0/35.0 45/45
208/230–3–60 187 253 14.7 91.0 1.6 6.8 26.8/26.8 35/35
208/230–1–60 187 253 27.0 145.0 1.6 9.1 44.5/44.5 60/60
208/230–3–60 187 253 18.1 123.0 1.6 9.1 33.3/33.3 40/40
VO LTAGE
RANGE
Min Max RLA LRA FLA FLA MCA
COMPRESSOR
OUTDOOR FAN
MOTOR
INDOOR FAN
MOTOR POWER SUPPLY
MAX FUSE
OR BKR
LEGEND
FLA — Full Load Amps
LRA — Locked Rotor Amps
MCA — Minimum Circuit Amps
MOCP — Maximum Overcurrent Protection
RLA
*Heater capacity (KW) based on heater voltage of 208v, 240v, & 480v.
If power distribution voltage to unit varies from rated heater voltage,
heater KW will vary accordingly.
NOTES:
1. In compliance with NEC (National Electrical Code) requirements
for multimotor and combination load equipment (refer to NEC
Articles 430 and 440), the overcurrent protective device for the
unit shall be Power Supply fuse. The CGA (Canadian Gas
Association) units may be fuse or circuit breaker.
2. Minimum wire size is based on 60 C copper wire. If other than
60 C wire is used, or if length exceeds wire length in table,
determine size from NEC.
3. Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply voltage is greater than 2%.
the percentage of voltage imbalance.
% Voltage imbalance
—
= 100 x
Rated
Load Amps
Use the following formula to determine
max voltage deviation from average voltage
average voltage
®
EXAMPLE: Supply voltage is 460-3-60.
Determine maximum deviation from average voltage.
(AB) 457
(BC) 464
(AC) 457
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 allowable 2%.
IMPORTANT: If the supply voltage phase imbalance is
more than 2%, contact your local electric utility company
immediately.
AB = 452 v
BC = 464 v
AC = 455 v
Average Voltage =
452=5v
457=7v
455=2v
= 1.53%
457
=
= 457
7
452 + 464 + 455
3
1371
3
C99024
—21—
TYPICAL WIRING SCHEMATIC—208/230-1-60 SHOWN
YEL
YEL
YEL
BLK
BLK
BLK
YEL
BLU
BRN
I
—22—
C01035
TYPICAL WIRING SCHEMATIC—208/230-3-60 SHOWN
—23—
C99077
C03025
CONTROLS
OPERATING SEQUENCE
Heating — On a call for heating, terminal “W” of the thermostat
is energized, starting the induced-draft motor. When the halleffect sensor on the induced-draft motor senses that it has
reached the required speed, the burner sequence begins. This
function is performed by the integrated gas control (IGC). The
evaporator fan motor is energized 45 seconds after flame is established. When the thermostat is satisfied and “W” is deenergized, the burners stop firing and the evaporator fan motor
shuts off after a 45-second time-off delay.
Cooling — When the room temperature rises to a point that is
slightly above the cooling control setting of the thermostat, the
thermostat completes the circuit between thermostat terminal R
to terminals Y and G. These completed circuits through the thermostat connect contactor coil (C) (through unit wire Y) and blower relay coil (BR) (through unit wire G) across the 24-v
secondary of transformer (TRAN).
The normally open contacts of energized contactor (C) close and
complete the circuit through compressor motor (COMP) to condenser (outdoor) fan motor (OFM). Both motors start instantly.
The indoor blower will cycle on and off with a call for cooling per
the on/off delay profile selected on the easy select™ circuit
board.
NOTE: Once the compressor has started and then has stopped,
it should not be started again until 5 minutes have elapsed.
The cooling cycle remains “on” until the room temperature drops
to a point that is slightly below the cooling control setting of the
room thermostat. At this point, the thermostat “breaks” the circuit
between thermostat terminal R to terminals Y and G. These
open circuits de-energize contactor coil C and relay coil BR. The
condenser and compressor motors stop. After a 30-second delay, the blower motor stops. The unit is in a “standby” condition,
waiting for the next “call for cooling” from the room thermostat.
The indoor blower operation with a call
cooling mode will perform by the on/off delay profile selected on
the Easy Select™ circuit board.
for fan operation (G) in
—24—
—25—
—26—
GUIDE SPECIFICATIONS
PACKAGED GAS HEATING/ELECTRIC COOLING
UNITS CONSTANT VOLUME APPLICATION
HVAC GUIDE SPECIFICATIONS
SIZE RANGE: 2 TO 5 TONS, NOMINAL COOLING
40,000 TO 130,000 BTUH,
NOMINAL HEATING INPUT
BRYANT MODEL NUMBER: 574B
PART 1 — GENERAL
1.01 SYSTEM DESCRIPTION
Outdoor rooftop mounted, gas heating/electric cooling unit
utilizing a scroll compressor for cooling duty. Unit shall
discharge supply air vertically or horizontally as shown on
contract drawings. Condenser fan/coil section shall have a
draw-thru design with vertical discharge for minimum
sound levels.
1.02 QUALITY ASSURANCE
A. Unit shall be rated in accordance with ARI Standards
210/240-94 and 270-95 (Sound ratings for 270-95 are
not listed with ARI).
B. Unit shall be designed in accordance with UL Standard
1995.
C. Unit shall be manufactured in a facility registered to
ISO 9001 manufacturing quality standard.
D. Unit shall be UL listed and certified under Canadian
Standards as a total package for safety requirements.
E. Roof curb shall be designed to conform to NRCA
Standards.
F. Insulation and adhesives shall meet NFPA 90A
requirements for flame spread and smoke generation.
G. Cabinet insulation shall meet ASHRAE Standard 62P.
1.03 DELIVERY, STORAGE AND HANDLING
Unit shall be stored and handled per manufacturer’s
recommendations.
PART 2 — PRODUCTS
2.01 EQUIPMENT
A. General:
Factory-assembled, single-piece, heating and cooling unit.
Contained within the enclosure shall be all factory wiring,
piping, controls, refrigerant charge with R-410A refrigerant,
and special features required prior to field start-up.
B. Unit Cabinet:
1. Unit Cabinet shall be constructed of phosphated,
zinc-coated, pre-painted steel capable of withstanding 500 hours in salt spray.
2. Normal service shall be through a single removable
cabinet panel.
3. The unit shall be constructed on a rust proof unit
base that has an externally trapped, integrated
sloped drain pan.
4. Evaporator fan compartment top surface shall be
insulated with a minimum 1/2-in. thick, flexible
fiberglass insulation, coated on the air side and
retained by adhesive and mechanical means. The
evaporator wall sections will be insulated with a
minimum semi-rigid foil-faced board capable of
being wiped clean. Aluminum foil-faced fiberglass
insulation shall be used in the entire indoor air
cavity section.
5. Unit shall have a field-supplied condensate trap.
C. Fans:
1. The evaporator fan shall be direct-drive, variable
speed motor and control.
2. Fan wheel shall be made from steel, and shall be
double-inlet type with forward curved blades with
corrosion resistant finish. Fan wheel shall be
dynamically balanced.
3. Condenser fan shall be direct drive propeller type
with aluminum blades riveted to corrosion resistant
steel spiders, be dynamically balanced, and
discharge air vertically.
D. Compressor:
1. Fully hermetic compressors with factory-installed
vibration isolation.
2. Scroll compressors shall be standard on all units.
E. Coils:
Evaporator and condenser coils shall have aluminum
plate fins mechanically bonded to seamless copper
tubes with all joints brazed. (Copper/copper and vinylcoated construction available as option). Tube sheet
openings shall be belled to prevent tube wear.
F. Heating Section:
1. Induced-draft combustion type with energy saving
direct spark ignition system and redundant main
gas valve.
2. Induced-draft motors shall be provided with solidstate hall-effect sensor to ensure adequate airflow
for combustion.
3. The heat exchangers shall be constructed of
aluminized steel for corrosion resistance.
4. Burners shall be of the in-shot type constructed of
aluminum coated steel.
5. All gas piping and electric power shall enter the unit
cabinet at a single location.
G. Refrigerant Components:
Refrigerant expansion shall be of the fixed orifice type.
H. Filters:
Filter section shall consist of field-installed, throwaway,
1-in. thick fiberglass filters of commercially available
sizes.
I. Controls and Safeties:
1. Unit controls shall be complete with a selfcontained low voltage control circuit.
2. Compressors shall incorporate a solid-state
compressor protector that provides reset
capability.
3. Unit shall provide high and loss-of-charge/low
pressure safety protection.
J. Operating Characteristics:
1. Unit shall be capable of starting and running at
125°F ambient outdoor temperature exceeding
maximum load criteria of ARI Standard 210.
2. Compressor with standard controls shall be capable of operation down to 55°F ambient outdoor temperature.
3. Units shall be provided with a selectable option of
fan time delay to prevent cold air delivery before
the heat exchanger warms up (see Easy Select™
Board).
4. Fan off delay for cooling is selected on Easy
Select™ Board.
—27—
GUIDE SPECIFICATIONS continued
K. Electrical Requirements:
All unit power wiring shall enter the unit cabinet at a single
location.
L. Motors:
1. Compressor motors shall be of the refrigerant-cooled
type with line-break thermal and current overload protection.
2. All fan motors shall have permanently lubricated bearings, and inherent, automatic reset, thermal overload
protection.
3. Condenser fan motor shall be totally enclosed.
M. Grille:
1. Louvered Grille:
Louvered grille shall be factory-installed to provide hail
guard and vandalism protection.
N. Duct Conversion:
Shall be available with the use of included duct covers.
O. Special Features Available:
1. Coil Options:
Shall include factory-installed optional tin-plated in-
door, copper/copper and vinyl-coated refrigerant
coils.
2. Economizer:
a. Economizer controls capable of providing free cool-
ing using outside air.
b. Equipped with low leakage dampers not to exceed
3% leakage, at 1.0 in. wg pressure differential.
c. Spring return motor shuts off outdoor damper on
power failure.
3. Flat Roof Curb:
Curbs shall have seal strip and a wood nailer for flash-
ing and shall be installed per manufacturer’s instructions.
4. Manual Outdoor Air Damper:
Package shall consist of damper, birdscreen, and rain-
hood which can be preset to admit outdoor air for yearround ventilation.
5. Thermostat:
To provide for one-stage heating and cooling in addition
manual or automatic changeover and indoor fan control.
6. Natural-to-Propane Conversion Kit:
Shall be complete with all required hardware to convert
to liquid propane (LP) operation.
7. Low Ambient Package:
Shall consist of a solid-state control and condenser coil
temperature sensor for controlling condenser-fan motor operation, which shall allow unit to operate down to
0° F outdoor ambient temperature.
8. Filter Rack Kit:
Shall provide filter mounting for downflow applications.
9. Square-To-Round Duct Transitions 024-048:
Shall have the ability to convert the supply and return
openings from rectangular to round.
10. Compressor Protection (Time Guard® II Kit)
Solid-state control shall protect compressor by prevent-
ing “short cycling.”
11. Crankcase Heater:
Shall provide anti-floodback protection for low-load
cooling applications.
12. High Altitude Kit:
Shall consist of natural gas orifices to compensate for
gas heat operation at 2001 to 6000 ft above sea level.
13. Low NO
Shall provide NO
(Natural Gas only) option:
x
reduction to values below 40 nano-
x
grams/joule to meet California emission requirements.
14. Compressor Hard Start Kit:
Shall provide additional starting torque for single-phase
compressors. (Single phase only).
15. Rigging kit includes rigging brackets which are inserted
into the unit base rigging holds to rig unit for rooftop applications.
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
UNIT MUST BE INSTALLED IN ACCORDANCE
WITH INSTALLATION INSTRUCTIONS
Cancels: NEW
Form PDS 574B.24.1
© 2003 Bryant Heating & Cooling Systems, 7310 W. Morris St., Indpls., IN 46231 PRINTED IN U.S.A. Catalog No. 5257-400 8-03
—28—
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