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 is Bryant’s
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 provides better comfort and energy efficiency.
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.
Model 574B
Sizes 024-060
2 to 5 Nominal Tons
Low NOx Models Available
EASY INSTALLATION—Factory-assembled package is a compact, 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—Unit is designed
for easy use in either downflow or horizontal applications. Each
unit is easily converted from horizontal to downflow.
EFFICIENT OPERATION
High-efficiency design offers SEER (Seasonal Energy Efficiency Ratios) of 13.0 and AFUE (Annual Fuel Utilization Efficiency) ratings as high as 81%.
Energy-saving, direct spark ignition saves gas by operating
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 designed for California installations. 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 are designed for high efficiency. Each compressor 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 produce precise air-to-gas mixture,
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 are constructed of aluminized 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 is standard
on all 574B models.
Direct-drive, PSC condenser-fan motors are designed to help
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.
Form No. PDS 574B.24.1
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 reliability 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 environment 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 vertical 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, zinccoated 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.
MODEL NUMBER NOMENCLATURE
574B
N
W
024
040
N
VS
Options
Model Number
574B – Single
Packaged Gas
Heating/Electric
Cooling
BT – AL evap, vinyl condens
CC – AL evap, CU condens
CU – CU evap & condens
TP – Base unit with tin plated indoor coil
hair pins
TV – TP with vinyl coating on outdoor coil
TC – TP with AL indoor coil and CU/CU
outdoor coil
Only used if ordering an option
Electrical Supply
N – 208/230-1-60
P – 208/230-3-60
Fuel
W – Natural Gas
P – Propane Gas
Low NOx Indicator
N – Low NOx Unit
Only used if ordering NOx units
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
Heat Input Size
040 – 40,000
060 – 60,000
090 – 90,000
115 – 115,000
130 – 130,000
LEGEND
CU — Copper
AL — Aluminum
—2—
ARI* CAPACITIES
COOLING CAPACITIES AND EFFICIENCIES
UNIT 574B
NOMINAL TONS
STANDARD CFM
NET COOLING
CAPACITIES (Btuh)
024040
030040
036060
036060
036090
042060
042090
048090
048115
048130
060090
060115
060130
2
800
24,000
EER
@A‡
11.0
1150
36,000
11.0
SEER†
SOUND RATINGS**
(dB)
13.0
72
13.0
72
2-1/2
3
3-1/2
11.0
4
1450
45,000
11.0
13.0
78
5
1750
57,000
11.0
13.0
78
LEGEND
dB
— Decibels
db
— Dry Bulb
SEER — Seasonal Energy Efficiency Ratio
wb
— 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).
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 temperature and 95°F db outdoor entering-air temperature.
2. Before purchasing this appliance, read important energy cost and
efficiency information available from your retailer.
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
HEATING INPUT
(Btuh)
OUTPUT CAPACITY
(Btuh)
TEMPERATURE RISE
RANGE (°F)
AFUE
024040
030040
40,000
31,000
20-50
80.1
030060
036060
042060
60,000
036090
042090
048090
060090
90,000
90,000
90,000
90,000
46,000
46,000
47,000
70,000
71,000
70,000
70,000
35-65
25-55
20-50
45-75
35-65
25-55
25-55
78.4
78.7
78.7
79.9
79.9
78.6
78.6
048115
060115
115,000
92,000
35-65
81.1
048130
060130
130,000
104,000
103,000
40-70
80.3
5
2
3
UNIT
AR
A
AIR
CO
Y
NING
ITIO
ND
A2
T
IFIED O ARI A
RT
S
C
CE
EQ
RI
YING WITH
PL
OM
MANUFACTUR
ER
LEGEND
AFUE — Annual Fuel Utilization Efficiency
NOTE: Before purchasing this appliance, read important energy cost and efficiency information available from your retailer.
UIP M E NT
STA
NDARD
21
0
OUTDOOR SOUND: OCTAVE BAND DATA — DECIBELS (Lw(A))
MODEL NO.
Frequency (Hz)
125
250
500
1000
024
57.5
61.1
68.0
68.4
030
—
—
—
—
036
60.7
63.3
66.8
66.5
574B
042
—
—
—
—
048
62.4
69.9
71.3
73.4
060
64.1
68.6
71.2
73.9
2000
4000
8000
64.5
59.0
51.7
—
—
—
64.2
60.3
53.0
—
—
—
70.0
66.3
60.1
69.8
68.1
61.8
—4—
PHYSICAL DATA
UNIT SIZE 574B
024040
030040
030060
036060
036090
042060
042090
NOMINAL CAPACITY (ton)
2
2-1/2
2-1/2
3
3
3-1/2
3-1/2
OPERATING WEIGHT (lb)
350
388
388
24 x 30 x 1
24 x 30 x 1
COMPRESSORS
Scroll
Quantity
1
REFRIGERANT (R-410A)
Quantity (lb)
7.3
9.5
9.5
REFRIGERANT METERING DEVICE
Indoor
TXV
CONDENSER COIL
Rows—Fins/in.
Face Area (sq ft)
2/21
11.95
2/21
13.7
2/21
13.7
2350
22
1/8 (825)
2350
22
1/8 (825)
2350
22
1/8 (825)
3/15
3.7
4/15
3.7
4/15
3.7
800
10 x 10
1/2
1150
11 x 10
3/4
1150
11 x 10
3/4
2…44
2…38
3…38
2…50
2…46
3…46
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)
610 ± 15
420 ± 25
Cutout
Reset (Auto.)
LOSS-OF-CHARGE/LOW-PRESSURE SWITCH
(Liquid Line) (psig)
Cutout
Reset (Auto.)
20 ± 5
45 ± 10
RETURN-AIR FILTERS (in.)†
Throwaway
†
*
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
Required filter sizes shown are based on the larger of the ARI (Air Conditioning & Refrigeration Institute) rated cooling airflow 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.
—5—
PHYSICAL DATA (cont)
UNIT SIZE 574B
048090
048115
048130
060090
060115
NOMINAL CAPACITY (ton)
4
4
4
5
5
5
OPERATING WEIGHT (lb)
463
463
463
499
499
499
13.5
13.5
13.5
COMPRESSORS
060130
Scroll
Quantity
1
REFRIGERANT (R-410A)
Quantity (lb)
11.25
11.25
11.25
REFRIGERANT METERING DEVICE
Indoor
TXV
CONDENSER COIL
Rows—Fins/in.
2/21
2/21
2/21
2/21
2/21
2/21
Face Area (sq ft)
17.4
17.4
17.4
19.3
19.3
19.3
3300
22
1/4 (1100)
3300
22
1/4 (1100)
3300
22
1/4 (1100)
3300
22
1/4 (1100)
3300
22
1/4 (1100)
3300
22
1/4 (1100)
4/15
4.7
4/15
4.7
4/15
4.7
4/17
5.7
4/17
5.7
4/17
5.7
1400
11 x 10
3/4
1400
11 x 10
3/4
1400
11 x 10
3/4
1750
11 x 10
1.0
1750
11 x 10
1.0
1750
11 x 10
1.0
3…38
3…33
3…31
3…38
3…33
3…31
3…46
3…42
3…41
3…46
3…42
3…41
24 x 30 x 1
24 x 30 x 1
24 x 30 x 1
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)
610 ± 15
420 ± 25
Cutout
Reset (Auto.)
LOSS-OF-CHARGE/LOW-PRESSURE SWITCH
(Liquid Line) (psig)
Cutout
Reset (Auto.)
20 ± 5
45 ± 10
RETURN-AIR FILTERS (in.)
Throwaway†
†
**
24 x 30 x 1
24 x 30 x 1
24 x 30 x 1
Required filter sizes shown are based on the larger of the ARI (Air Conditioning & Refrigeration Institute) rated cooling airflow 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.
—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.
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.
Manual outside air damper includes hood and filter rack with
adjustable damper blade for up to 25% outdoor air.
—7—
Economizer
FILTER ACCESS DOOR
(HORIZONTAL
APPLICATION ONLY.)
DO NOT REMOVE
FROM DOWNFLOW
DISCHARGE.
REPLACEMENT
PANEL
HOLE FOR
ECONOMIZER
WIRING HARDNESS
17 13/32
(442mm)
11 13/32”
(290mm)
RAINHOOD
DOOR
LATCH ANGLE
16 1/4”
(413mm)
HINGED FILTER
ACCESS DOOR INSTALL
FILTER ACCESS
DOOR STICKER
ALUMINUM
FILTER
A99315
A99314
Manual Outside Air Damper
Filter Rack
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)
REQ’D CLEARANCES TO COMBUSTIBLE MAT’L. 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.
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
surfaces, control box side . . . . . . . . . . . . . . . . . 42 (1066.8)
LEGEND
CG - Center of Gravity
COND - Condenser
EVAP - Evaporator
NEC - National Electrical Code
REQ'D - Required
Note: Dimensions are in in. (mm)
UNIT
574B024040
574B030040/060
574B036060/090
ELECTRICAL
CHARACTERISTICS
208/230-1-60
208/230-1-60
208/230-1-60
208/230-3-60
UNIT WEIGHT
lb.
350
kg.
159
388
176
—9—
39.02 [991.1]
CENTER OF GRAVITY
IN. [MM]
X
Y
Z
20 [508]
19.3 [489]
17.6 [447]
41.02 [1041.9]
20 [508]
UNIT HEIGHT
IN. [MM]
“A”
14 [355.6]
13 [330.2]
BASE UNIT DIMENSIONS – 574B042-060
C99074
REQUIRED CLEARANCE FOR OPERATION AND SERVICING
REQUIRED CLEARANCE TO COMBUSTIBLE MATL.
in. [mm]
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] *
in. [mm]
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]
*MINIMUM DISTANCES: IF UNIT IS PLACED LESS THAN 12.00 [304.8] FROM
WALL SYSTEM, THEN SYSTEM PERFORMANCE MAYBE COMPROMISE.
MILLIMETERS [IN.]
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]
NEC. REQUIRED CLEARANCES.
FLUE
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,
CENTER OF GRAVITY
IN. [MM]
Y
lb.
kg.
UNIT HEIGHT
IN. [MM]
“A”
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]
UNIT WEIGHT
—10—
X
Z
ACCESSORY DIMENSIONS
HVAC unit
base
HVAC unit
base
Screw
(NOTE A)
Screw
(NOTE A)
Gasketing
inner flange*
*Gasketing
outer flange
Gasketing
inner flange*
*Gasketing
outer flange
Wood nailer*
Flashing field
supplied
Wood nailer*
Flashing field
supplied
Roofcurb*
Insulation (field
supplied)
Roofing material
field supplied
Insulation (field
supplied)
Roofing material
field supplied
Duct work
field supplied
Cant strip
field supplied
Roofcurb*
Duct work
field supplied
Cant strip
field supplied
Roof
Roof
*Provided with roofcurb
*Provided with roofcurb
Roof Curb for Small Cabinet
Roof Curb for Large Cabinet
Note A: When unit mounting screw is used,
retainer bracket must also be used.
Note A: When unit mounting screw is used,
retainer bracket must also be used.
Supply opening
(B x C)
B Typ.
44 5/16"
(1125.5mm)
D
C Typ.
R/A
A
Insulated
deck pan
S/A
Gasket around
duct
Insulated
deck pan
Short
Support
Gasket around
outer edge
Long
Support
Return opening
(B X C)
C00076
Roof Curb Dimensions
Side View
UNIT SIZE
ROOF CURB
024-036
042-060
ODS ORDER NUMBER
CPRFCURB006A00
CPRFCURB007A00
CPRFCURB008A00
CPRFCURB009A00
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.
—11—
A
IN. [MM]
8 [203]
14 [356]
8 [203]
14 [356]
B
IN. [MM]
11 [279]
11 [279]
16 3/16 [411]
16 3/16 [411]
C
IN. [MM]
16 1/2 [419]
16 1/2 [419]
17 3/8 [441]
17 3/8 [441]
D
IN. [MM]
28 3/4 [730]
28 3/4 [730]
40 1/4 [1022]
40 1/4 [1022]
574B CORNER WEIGHTS
1
2
y
4
CORNER #
1
2
3
4
TOTAL WEIGHT
3
x
024
70
54
84
141
350
030
036
78
60
94
156
388
042
048
92
72
111
188
463
060
100
78
120
201
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
IV
DETERMINE FAN SPEED AND POWER REQUIREMENTS 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 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.
—12—
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.
PERFORMANCE DATA
STANDARD INDOOR ECM MOTOR
COOLING CAPACITIES
574B024 COOLING PERFORMANCE TABLE
Evaporator Air — CFM / BF
Temp (F)
Outdoor Air
Entering
Condenser
75
TC
SHC
kW
85
TC
SHC
kW
95
TC
SHC
kW
105
TC
SHC
kW
115
TC
SHC
kW
125
TC
SHC
kW
800/0.026
900/0.032
1000/0.04
Evaporator Air — Ewb (F)
62
63*
67
72
62
63*
67
72
62
63*
67
72
24.0
21.9
1.7
22.9
21.4
1.9
21.8
20.8
2.2
20.5
20.2
2.4
19.2
19.4
2.7
17.8
18.5
2.9
24.5
21.3
1.7
23.3
20.7
1.9
22.2
20.2
2.2
20.9
19.5
2.4
19.5
18.8
2.7
18.0
18.1
2.9
26.5
18.7
1.8
25.3
18.1
2.0
24.0
17.6
2.2
22.6
16.9
2.4
21.1
16.3
2.7
19.4
15.5
3.0
29.1
15.4
1.8
27.9
14.9
2.0
26.5
14.3
2.2
25.0
13.7
2.4
23.3
13.0
2.7
21.4
12.3
3.0
24.6
23.5
1.8
23.5
22.9
2.0
22.3
22.3
2.2
21.0
21.6
2.4
19.8
20.6
2.7
18.5
19.2
3.0
25.1
22.8
1.8
23.9
22.2
2.0
22.6
21.6
2.2
21.3
20.9
2.4
19.9
20.2
2.7
18.5
19.2
3.0
27.1
19.8
1.8
25.8
19.2
2.0
24.5
18.7
2.2
23.0
18.0
2.5
21.5
17.3
2.7
19.5
16.5
3.0
29.8
16.1
1.8
28.5
15.6
2.0
27.0
15.0
2.2
25.4
14.3
2.5
23.7
13.7
2.7
21.7
12.9
3.0
25.1
25.0
1.8
23.9
24.3
2.0
22.7
23.6
2.2
21.6
22.5
2.5
20.7
21.5
2.7
19.0
19.8
3.0
25.5
24.2
1.8
24.3
23.6
2.0
23.0
22.9
2.2
21.7
22.2
2.5
20.4
21.2
2.7
19.0
19.7
3.0
27.4
20.8
1.8
26.2
20.3
2.1
24.8
19.7
2.3
23.3
19.0
2.5
21.7
18.3
2.8
19.9
17.6
3.1
30.4
16.7
1.9
28.9
16.2
2.1
27.4
15.6
2.3
25.7
14.9
2.5
23.6
14.1
2.8
21.9
13.5
3.1
574B030 COOLING PERFORMANCE TABLE
Evaporator Air—CFM/BF
Temp (F)
Outdoor Air
Entering
Condenser
875/0.08
75
85
TC
SHC
kW
95
TC
SHC
kW
105
TC
SHC
kW
115
TC
SHC
kW
125
TC
SHC
kW
1125/0.10
Evaporator Air — Ewb (F)
62
TC
SHC
kW
1000/0.09
63*
67
72
62
See Legend and Notes on page 15.
—13—
63*
67
72
62
63*
67
72
PERFORMANCE DATA (cont)
STANDARD INDOOR ECM MOTOR
COOLING CAPACITIES (cont)
574B036 COOLING PERFORMANCE TABLE
Evaporator Air—CFM/BF
Temp (F)
Outdoor Air
Entering
Condenser
75
TC
SHC
kW
85
TC
SHC
kW
95
TC
SHC
kW
105
TC
SHC
kW
115
TC
SHC
kW
125
TC
SHC
kW
1100/0.06
1225/0.07
1400/0.08
Evaporator Air — Ewb (F)
62
63*
67
72
62
63*
67
72
62
63*
67
72
36.2
33.2
2.7
34.6
32.4
2.9
33.0
31.6
3.2
31.3
30.6
3.6
29.6
29.3
4.0
27.8
27.5
4.4
36.8
26.7
2.7
35.1
26.0
2.9
33.4
25.3
3.2
31.5
24.5
3.6
29.4
23.7
4.0
27.2
22.8
4.3
39.7
27.8
2.7
37.9
27.1
3.0
36.0
26.4
3.3
34.0
25.6
3.6
31.8
24.8
4.0
29.4
23.9
4.4
43.8
22.3
2.7
41.8
21.6
3.0
39.7
20.9
3.3
37.5
20.1
3.6
35.0
19.3
4.0
32.4
18.4
4.4
36.9
34.7
2.7
35.3
34.0
3.0
33.7
32.9
3.3
32.1
31.5
3.6
30.4
30.0
4.0
28.4
28.2
4.4
37.4
27.9
2.7
35.6
27.1
3.0
33.8
26.4
3.3
31.9
25.7
3.6
29.8
24.8
4.0
27.5
23.8
4.4
40.3
29.0
2.7
38.4
28.3
3.0
36.5
27.6
3.3
34.3
26.8
3.7
32.1
26.0
4.0
29.7
25.0
4.4
44.4
23.1
2.8
42.4
22.4
3.0
40.2
21.7
3.4
37.9
20.9
3.7
35.4
20.0
4.0
32.7
19.1
4.4
37.9
36.9
2.8
36.4
35.6
3.1
34.8
34.4
3.4
33.1
32.8
3.8
31.3
31.0
4.1
29.3
29.0
4.5
38.1
29.6
2.8
36.3
28.9
3.1
34.4
28.1
3.4
32.4
27.3
3.7
30.3
26.4
4.1
28.0
25.4
4.5
41.0
30.9
2.8
39.1
30.2
3.1
37.0
29.4
3.4
34.9
28.6
3.8
32.6
27.7
4.1
30.1
26.7
4.5
45.1
24.2
2.9
43.1
23.6
3.2
40.8
22.8
3.5
38.4
22.0
3.8
35.8
21.1
4.2
33.0
20.2
4.5
574B042 COOLING PERFORMANCE TABLE
Evaporator Air—CFM/BF
Temp (F)
Outdoor Air
Entering
Condenser
1225/0.11
75
85
TC
SHC
kW
95
TC
SHC
kW
105
TC
SHC
kW
115
TC
SHC
kW
125
TC
SHC
kW
1575/0.14
Evaporator Air — Ewb (F)
62
TC
SHC
kW
1400/0.12
63*
67
72
62
See Legend and Notes on page 15.
—14—
63*
67
72
62
63*
67
72
PERFORMANCE DATA (cont)
STANDARD INDOOR ECM MOTOR
COOLING CAPACITIES (cont)
574B048 COOLING PERFORMANCE TABLE
Evaporator Air—CFM/BF
Temp (F)
Outdoor Air
Entering
Condenser
75
TC
SHC
kW
85
TC
SHC
kW
95
TC
SHC
kW
105
TC
SHC
kW
115
TC
SHC
kW
125
TC
SHC
kW
1260/0.06
1400/0.06
1600/0.08
Evaporator Air — Ewb (F)
62
63*
67
72
62
63*
67
72
62
63*
67
72
45.0
39.3
3.4
42.8
38.2
3.7
40.6
36.9
4.1
38.2
35.7
4.6
35.7
34.4
5.0
33.4
32.1
5.6
45.8
32.0
3.4
43.6
30.9
3.7
41.3
29.8
4.1
38.9
28.7
4.6
36.3
27.5
5.0
33.4
26.2
5.6
49.6
33.4
3.4
47.2
32.3
3.8
44.7
31.2
4.2
42.1
30.1
4.6
39.3
28.9
5.1
36.2
27.6
5.6
54.7
27.2
3.4
52.1
26.2
3.8
49.4
25.2
4.2
46.4
24.0
4.6
43.3
22.9
5.1
39.4
21.5
5.7
46.7
42.6
3.4
44.3
41.3
3.7
41.8
39.9
4.1
39.6
38.3
4.6
38.2
35.7
5.1
34.6
33.8
5.6
47.3
34.3
3.4
44.9
33.2
3.7
42.4
32.0
4.1
39.8
30.7
4.6
37.1
29.5
5.0
34.1
28.2
5.6
51.2
35.8
3.4
48.6
34.7
3.8
46.0
33.6
4.2
43.1
32.3
4.6
40.1
31.0
5.1
36.9
29.7
5.6
56.3
28.9
3.5
53.5
27.7
3.8
50.7
26.7
4.2
47.6
25.5
4.7
44.2
24.3
5.1
40.5
22.9
5.6
48.1
45.8
3.4
45.6
44.3
3.8
44.2
43.0
4.2
41.5
40.0
4.6
38.7
38.2
5.1
36.1
35.6
5.6
48.7
36.8
3.4
46.1
35.5
3.8
43.7
34.6
4.1
40.8
33.2
4.6
37.9
31.8
5.1
34.8
30.2
5.6
52.5
38.4
3.4
49.9
37.3
3.8
47.0
36.1
4.2
44.0
34.8
4.6
40.8
33.5
5.1
37.5
31.9
5.6
57.8
30.6
3.5
54.8
29.4
3.8
51.8
28.3
4.2
48.5
27.0
4.7
45.0
25.8
5.1
41.2
24.4
5.6
574B060 COOLING PERFORMANCE TABLE
Evaporator Air — CFM/BF
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
1500/0.004
1750/0.007
2000/0.01
Evaporator Air — Ewb (F)
62
63*
67
72
62
63*
67
72
62
63*
67
72
57.2
49.4
4.1
54.7
48.2
4.5
52.2
47.0
5.0
49.4
45.7
5.5
46.5
44.3
6.1
43.3
42.8
6.7
58.2
47.9
4.1
55.6
46.7
4.5
53.0
45.4
5.0
50.2
44.1
5.6
47.2
42.7
6.2
43.9
41.2
6.8
62.4
41.6
4.2
59.7
40.4
4.6
56.9
39.2
5.1
53.8
37.9
5.6
50.5
36.4
6.2
46.7
34.9
6.8
68.1
33.8
4.2
65.2
32.6
4.7
62.0
31.4
5.2
58.7
30.1
5.7
55.0
28.7
6.3
52.2
27.8
6.8
58.8
53.6
4.2
56.2
52.4
4.7
53.5
51.1
5.1
50.7
49.8
5.7
48.1
48.1
6.2
45.2
45.2
6.8
59.7
51.8
4.3
57.0
50.5
4.7
54.3
49.2
5.2
51.4
47.9
5.7
48.3
46.6
6.3
45.1
45.1
6.9
64.0
44.5
4.3
61.1
43.2
4.8
58.0
41.9
5.3
54.8
40.6
5.8
51.3
39.2
6.4
47.4
37.6
7.0
69.8
35.4
4.4
66.6
34.2
4.9
63.2
32.9
5.3
59.6
31.6
5.9
56.8
30.6
6.4
52.5
28.9
7.0
60.0
57.6
4.4
57.4
56.3
4.8
55.0
55.0
5.2
52.5
52.5
5.8
49.7
49.7
6.4
46.4
46.4
7.0
60.8
55.4
4.4
58.1
54.2
4.9
55.3
52.9
5.3
52.4
51.6
5.8
49.7
49.7
6.4
46.4
46.4
7.0
64.9
47.1
4.5
61.9
45.8
5.0
58.7
44.5
5.5
55.4
43.2
6.0
51.8
41.8
6.6
47.9
40.2
7.2
70.8
36.8
4.6
67.4
35.6
5.0
64.1
34.4
5.5
60.2
33.0
6.1
57.0
31.7
6.6
52.2
29.7
7.2
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:
t
ldb
= t
edb
sensible capacity (Btuh)
1.10 x cfm
t lwb = Wet-bulb temperature corresponding to enthalpy of air leaving
evaporator coil (h lwb )
hlwb = hewb
total capacity (Btuh)
4.5 x cfm
Where: h ewb = 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)
FILTER PRESSURE DROP (In. wg)
FILTER SIZE
20 X 20 X 1
20 X 24 X 1
24 X 30 X 1
500
0.05
—
—
600
0.07
—
—
700
0.08
—
—
CFM
800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300
0.10 0.12 0.13 0.14 0.15 —
—
—
—
—
—
—
—
—
— —
— 0.09 0.10 0.11 0.13 0.14 0.15 0.16 —
—
—
—
—
—
— —
—
—
—
— 0.07 0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18
—16—
574B COOLING DRY COIL ECM AIRFLOW—SMALL CABINET
UNIT
SIZE
024
030
036
CFM ADJUST
PIN SELECT
LO PIN
NOM PIN
HI PIN
EXTERNAL STATIC
PRESSURE RANGE
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
COOLING
745
675
—
835
750
690
940
880
815
COOLING
DEHUMIDIFY
675
625
—
675
650
600
755
730
705
COOLING
940
860
785
1020
965
895
1185
1100
1010
COOLING
DEHUMIDIFY
820
785
735
820
800
770
955
920
880
COOLING
1025
935
—
1145
1085
1005
1320
1260
1180
COOLING
DEHUMIDIFY
925
885
—
925
900
870
1060
1040
1010
574B COOLING DRY COIL ECM AIRFLOW—LARGE CABINET
UNIT
SIZE
042
048
060
CFM ADJUST
PIN SELECT
LO PIN
NOM PIN
HI PIN
EXTERNAL STATIC
PRESSURE RANGE
0.1–1.0
0.1–1.0
0.1–1.0
COOLING
1035
1095
1280
COOLING
DEHUMIDIFY
880
880
1025
COOLING
1150
1285
1500
COOLING
DEHUMIDIFY
1025
1025
1200
COOLING
1480
1630
1920
COOLING
DEHUMIDIFY
1305
1305
1535
574B HEATING ECM AIRFLOW—SMALL CABINET
EASY SELECT™
BOARD SETTING (CFM)
UNIT
SIZE
024
030
036
700
EXTERNAL STATIC
PRESSURE
800
1100
1250
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
GAS HEAT SIZE
040
—
—
—
855
770
710
—
—
—
—
—
—
040
—
—
—
880
840
805
—
—
—
—
—
—
060
—
—
—
—
—
—
1030
970
910
—
—
—
060
—
—
—
—
—
—
1035
995
955
—
—
—
090
—
—
—
—
—
—
—
—
—
1170
1110
1025
574B HEATING ECM AIRFLOW—LARGE CABINET
EASY SELECT™
BOARD SETTING (CFM)
UNIT
SIZE
042
048
060
EXTERNAL STATIC
PRESSURE
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
—
GAS HEAT SIZE
060
1000
—
—
—
090
—
1250
—
—
—
090
—
1250
—
—
—
115
—
—
1600
—
—
130
—
—
—
1750
—
090
—
1250
—
—
—
115
—
—
1600
—
—
130
—
—
—
—
1800
—17—
574B ECM AIR FLOW VS. TEMPERATURE RISE CHART
UNIT
COOLING SIZE
574B
574B
574B
574B
574B
574B
574B
574B
574B
574B
574B
574B
574B
024
030
030
036
036
042
042
048
048
048
060
060
060
RATED GAS
INPUT RATE
(X 1000)
40
40
60
60
90
60
90
90
115
130
90
115
130
AIRFLOW SETTING
EAST SELECT™
(SCFM)
800
800
1100
1100
1200
1000
1250
1250
1600
1750
1600
1600
1800
CALCULATED
TEMPERATURE
RISE
36.5
36.5
40
40
54
44
53
53
53
54
41
53
53
MIN.
TEMP
RISE
20
20
35
25
45
20
35
25
35
40
25
35
40
MAX
TEMP
RISE
50
50
65
55
75
50
65
55
65
70
55
65
70
MAX
DISCH.
TEMP
175
175
165
165
175
165
170
165
170
175
155
170
175
PERFORMANCE DATA (CONT)
ECONOMIZER/1-IN. FILTER PRESSURE DROP (in. wg)
UNIT 574B
024-036
042-060
PRESSURE DROP
0.20
0.25
HIGH ALTITUDE COMPENSATION
LIQUID PROPANE ONLY
ORIFICE CONVERSION — 3.5 in. wc
MANIFOLD PRESSURE*
NATURAL GAS ONLY
ORIFICE CONVERSION — 3.5 in. wc
MANIFOLD PRESSURE*
INPUT
(Btuh)
40,000
60,000
90,000
115,000
130,000
32,075
48,547
72,820
90,094
102,630
ALTITUDE (ft)
0-2000
2001-6000
OUTPUT
(Btuh)
31,000
46,000
70,000
92,000
103,000
24,858
37,219
56,638
72,075
81,315
ORIFICE
NUMBER†
#44
#38
#38
#33
#31
#48
#42
#42
#37
#34
ALTITUDE (ft)
0-2000
2001-6000
INPUT
(Btuh)
40,000
57,000
85,500
115,000
127,000
33,834
49,238
73,856
94,571
101,284
OUTPUT
(Btuh)
31,000
43,720
66,520
92,000
100,580
26,221
37,766
57,461
75,657
80,214
ORIFICE
NUMBER†
#50
#46
#46
#42
#41
#52
#48
#48
#44
#43
* 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.
574B ECM WET COIL PRESSURE DROP
STANDARD CFM
UNIT
SIZE
600
700
800
900
1000
1100
1200
1300
1400
1500
1600
1700
1800
1900
2000
2100
024
0.005
0.007
0.010
0.012
0.015
—
—
—
—
—
—
—
—
—
—
—
030
—
0.007
0.010
0.012
0.015
0.018
0.021
0.024
—
—
—
—
—
—
—
—
036
—
—
—
0.019
0.023
0.027
0.032
0.037
0.042
0.047
—
—
—
—
—
—
042
—
—
—
—
0.014
0.017
0.020
0.024
0.027
0.031
0.035
0.039
0.043
—
—
—
048
—
—
—
—
—
—
0.027
0.032
0.036
0.041
0.046
0.052
0.057
0.063
0.068
—
060
—
—
—
—
—
—
—
—
—
0.029
0.032
0.036
0.040
0.045
0.049
0.053
—18—
TYPICAL PIPING AND WIRING
ROOF-MOUNTING
CURB
ROOF
RETURN-AIR
FLEXIBLE DUCT
SUPPLY-AIR
FLEXIBLE DUCT
CEILING
CONCENTRIC DIFFUSER BOX
(FIELD-SUPPLIED)
C00023
INDOOR
THERMOSTAT
RETURN
AIR
FROM
POWER
SOURCE
TOP COVER
DISCONNECT
PER NEC*
FROM
GAS LINE
*NEC - NATIONAL ELECTRICAL CODE
C00022
—19—
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
V-PH-Hz
024
030
208/230–1–60
208/230–1–60
208/230–1–60
208/230–3–60
208/230–1–60
208/230–3–60
208/230–1–60
208/230–3–60
208/230–1–60
208/230–3–60
036
042
048
060
VOLTAGE
RANGE
Min
187
187
187
187
187
187
187
187
187
187
COMPRESSOR
Max
253
253
253
253
253
253
253
253
253
253
RLA
13.5
16.9
15.9
12.2
22.4
15.4
21.3
14.7
27.0
18.1
—
—
—
—
—
Full Load Amps
Locked Rotor Amps
Minimum Circuit Amps
Maximum Overcurrent Protection
Rated Load Amps
FLA
0.8
0.8
0.8
0.8
0.8
0.8
1.6
1.6
1.6
1.6
FLA
4.3
4.3
6.8
6.8
6.8
6.8
6.8
6.8
9.1
9.1
Average Voltage = 452 + 464 + 455
3
1371
=
3
= 457
®
*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%. Use the following formula to determine
the percentage of voltage imbalance.
% Voltage imbalance
= 100 x
LRA
61.0
73.0
83.0
77.0
105.0
88.0
109.0
91.0
145.0
123.0
POWER SUPPLY
MAX FUSE
MCA
OR BKR
22.0/22.0
30/30
25.0/25.0
30/30
28.7/28.7
35/35
22.9/22.9
30/30
35.6/35.6
45/45
26.9/26.9
35/35
35.0/35.0
45/45
26.8/26.8
35/35
44.5/44.5
60/60
33.3/33.3
40/40
EXAMPLE: Supply voltage is 460-3-60.
AB = 452 v
BC = 464 v
AC = 455 v
LEGEND
FLA
LRA
MCA
MOCP
RLA
OUTDOOR FAN INDOOR FAN
MOTOR
MOTOR
max voltage deviation from average voltage
average voltage
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.
7
% Voltage Imbalance = 100 x
457
= 1.53%
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.
C99024
—21—
TYPICAL WIRING SCHEMATIC—208/230-1-60 SHOWN
YEL
BLK
YEL
YEL
BLU
YEL
BLK
BLK
BRN
I
C01035
—22—
TYPICAL WIRING SCHEMATIC—208/230-3-60 SHOWN
C99077C03025
—23—
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 for fan operation (G) in
cooling mode will perform by the on/off delay profile selected on
the Easy Select™ circuit board.
—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.
—27—
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.
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 indoor, copper/copper and vinyl-coated refrigerant
coils.
2. Economizer:
a. Economizer controls capable of providing free cooling 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 flashing and shall be installed per manufacturer’s instructions.
4. Manual Outdoor Air Damper:
Package shall consist of damper, birdscreen, and rainhood 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 preventing “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 NOx (Natural Gas only) option:
Shall provide NOx reduction to values below 40 nanograms/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.
—28—
Catalog No. 5257-400
8-03