Direct-Fired Gas Heaters - Rupp Air Management Systems

M A N A G E M E N T
S Y S T E M S
Direct-Fired Gas Heaters
Make-Up Air
Space Heating
Variable Air Volume
80/20 System
High Temperature
T h e R e l i a b l e S o u r c e F o r
M a k e - U p A i r & S p a c e H e a t i n g
Rupp Air
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D e d i c a t e d To P r o v i d i n g
Quality, Durability,
Reliability And Value In
All Its Ven tila tion Products
Since 1965, Rupp Air Management Systems has designed
and manufactured direct-fired, gas heaters for commercial
and industrial applications. From make-up air to supplying
the total heat system large or small, Rupp Air has the solution
to meet your needs. Over the years, we have continuously
improved our product line meeting customers ever increasing
product and service needs by offering equipment that is
Built Right First...to Last.
C O N T E N T S
Gas Heaters
4-5
Types of Direct-Fired Gas Heaters
RAM & CFA Standard Features
6-7
RAM & CFA Optional
8-9
Features & Accessories
Rupp Air is dedicated to producing the right direct-fired
system designed and engineered with the smallest of details
in mind to give unmatched performance. Our continued
commitment to quality and mechanical reliability means that
each system has to be hassle free to install, and will supply
fresh, clean, tempered air to any indoor environment.
Rupp Air’s direct-fired gas heaters economically replace
exhausted air by delivering replacement air at a constant
temperature regardless of outside temperature. Rupp Air
direct-fired heaters can also be designed to heat a space
with a minimum introduction of fresh air to insure the
highest efficiency heating system.
Control Systems
10 - 11
RAM / CFA
12 - 15
Dimensional Data
Direct-Fired Heater Selection
16 - 17
RAM / CFA
18 - 26
Performance Data
Rupp Air Commitment
27
and Warranty
Each Rupp Air direct-fired heater has been designed to
use the most fuel efficient burner technology available
with up to a 30:1 turndown capacity. The use of these
high efficient heaters will not only heat your space but
will also help eliminate drafts, replace contaminated or
stale air, eliminate temperature stratification, and create a
positive building pressure – necessary for good indoor-air
quality – while maintaining comfort levels.
Rupp Air has developed an easy to use selection software program, enabling the user to specifically design the exact heater
to meet the application criteria. The Result...year round,
cost effective comfort.
3
T y p e s
O f
D i r e c t - F i re d G a s H e a t e r s
Constant Volume System
The constant volume 100% direct-fired make-up air
system heaters provide a constant rate of supply air
to the space. The gas flame in the unit heats the fresh
make-up air directly, eliminating energy losses associated
with other types of heating. For most applications,
introducing slightly more make-up air into the space
than what is exhausted produces the best results. A
slightly positive building pressure assures the best
performance. Some applications, such as the commercial
kitchens, require more air exhausted than introduced
to control over pressurization of the kitchen.
4
Two-Speed System
The two-speed, direct-fired make-up air system functions
the same as constant volume, however provides two
different air-delivery rates by using either an 1800/900
RPM motor or 1800/1200 RPM motor.
Two-speed units offer flexibility to buildings with two, fixedexhaust loads or where an increase of airflow is desired.
Units for buildings with two fixed-exhaust loads should
have CFM ratios that match the available two-speed
motor RPM ratios. The low speed is interlocked with the
first exhaust fan, while high speed operates when both
exhaust fans are running, allowing one unit to handle
two different exhaust loads.
The use of the discharge reduction damper in this
s y stem offers a low cost up front investment with the
same operation benefits of the VFD. By closing the
reduction damper, the output CFM is reduced. This design
has the ability to be setup as a two position CFM rate unit
or a varying CFM unit based off pressure in the space.
Both VAV systems have been designed with additional
safety features and controls to insure safe burner operation.
The example on page 4 illustrates the use of a two
speed unit for transit or automotive type facility. Low
speed is used for general ventilation and heating.
However, if the co-detector senses high limits of carbon
monoxide, the two speed unit goes to high speed and
the second exhaust fan turns on to ventilate the space.
There are many uses for the two-speed system, however
another use is for paint booths designed for painting and
curing of paint. High speed use in paint mode and low
speed is used in curing mode to dry the painted surface.
80/20 System
80/20 systems can be a variable make-up air unit, a
total-building heat unit, or a combination of both. By recirculating air, this system provides the most efficient
building heat system.
Variable Air Volume System
The variable air volume (VAV) system allows variable
amounts of make-up air through one heater. This system
allows a heater to turn down to as low as 25% of its
designed CFM by use of a variable frequency drive
(VFD) or airfoil blade designed discharge reduction
damper. One unit can handle varying exhaust loads by
changing the CFM out put of the unit. This system is
ideal for spaces that have multiple exhaust loads and
recirculated air is not an option.
The use of the VFD in the system offers the highest level
of operating efficiency of any of the direct fired systems,
using only the required electrical energy to provide the
CFM needed. The VFD can be setup to operate in many
different ways to change the CFM required to the space.
A potentiometer can be used to manually position output
CFM, multiple set points can be set in the VFD to vary
output CFM, or a building pressure control device can be used
to vary output CFM by sensing pressure in the space.
One unit can handle multiple and varying exhaust loads
as a variable, make-up air unit using the 80/20 System.
This system offers constant discharge airflow but varies
the amount of outside air introduced to the building. With
the use of the 403M or the 404M space-temperature
control system, the unit can be a complete buildingheating system for either fixed or variable exhaust loads.
The 80/20 System supplies at least 20% outside air to
the building and mixes with re-circulated room air at a
maximum of 80%, without the return air re-circulated
through the burner. A building-pressure switch controls
the modulating-burner bypass and return-air dampers
introducing more outside air as the building’s exhaust
load changes. The varying exhaust-air loads automatically
and continually adjust the amount of make-up air
introduced into the system.
All Rupp Air direct fired systems are provided with terminals to
integrate operation with the building exhaust system.
For more information on this system please see our “80/20 Systems Catalog”
or contact your local sales office.
5
&
C F A
Features
R A M
Standard Features
RAM
Standard Features
Structural G-90 galvanized base
Heavy gauge G-90 galvanized steel casing
Interlocked wall seam and roof panels
Weatherproof construction
Hinged service doors with flush-mount latches
Standing roof seams
Double wall doors
Single piece construction up to RAM 230
Six discharge options
1 Casing 2 Burner Profile 3 Burner 4 Blower 5 Burner Observation Port
6 Lifting Lugs 7 Motor 8 Gas Connection 9 Main Fused Disconnect
10 Manifold Controls Vestibule 11 Electrical Controls Vestibule
CFA
Standard Features
Internal tubular frame
Heavy gauge G-90 galvanized steel casing
Weatherproof construction
Hinged service doors with flush-mount latches
Standing roof seams
Double wall doors
Rear doors on CFA22 & larger
Six discharge options
For additional details on standard features, options and
accessories, please visit us online at
w w w. r u p p a m s . c o m
6
1 Casing 2 Burner Profile 3 Burner 4 Blower 5 Burner Observation Port
6 Lifting Lugs 7 Motor 8 Gas Connection 9 Main Fused Disconnect
10 Manifold Controls Vestibule 11 Electrical Controls Vestibule
Burner Profile
Burner Observation Port
Electrical Controls Vestibule
• Adjustable profile plates
• Optional 80/20 system
• Optional two-speed system
• Optional Variable Air Volume system
• Easy view of burner and pilot for
startup
• Weatherproof enclosure
• Large doors for easy access to
controls
• Starter with burner interlock
• Exhaust-interlock terminals
• As-built wiring diagram on door
• Terminal strip for quick service check
• Blower and burner service switches
Burner
• Fully modulating
• Up to 30:1 turndown ratio
• Electric-pilot spark ignition
• Reliable flame rectification system
Lifting Lugs
• Heavy-duty lifting lugs standard
• Designed for easy hoisting and
installation
• Additional optional hanging lugs
available
Manifold Controls Vestibule
• Weatherproof enclosure
• Large doors for easy access to
manifold
• Manifold built to required codes
ANSI, FM, IRI and FIA
Motor
• Standard high E, open drip-proof
• Heavy gauge adjustable motor mount
• V-belt drive
• Adjustable drive up to and including
25 HP
• Optional TEFC
Gas Connection
• Quick seal design up to 1.5” pipe train
• Rubber pipe seals 2” and larger
• Allows no water leakage into casing
Need Photo
Blower
• FC-DWDI centrifugal blower assembly
• V-belt drive
• Pillow block 100,000-hour greasable
bearings on Models RAM18-236
• Permanently lubricated bearings on
Models RAM10-15
• Solid steel shaft
• Split shaft with couplings and four
bearings on twin units
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Main Fused Disconnect
• Standard feature
• Shuts power off to unit
C
US
Rupp Air Direct-Fired Heaters are ETLListed
to the ANSI Z83.4A-2001/CSA3.7a-2001
Combined Standards.
7
R A M
&
C F A
Options
Options & Accessories
• Motorized discharge or inlet damper with
safety interlock contacts
• Internal discharge damper on down discharge
arrangement models
• Fresh-Air intake hood with birdscreen
and optional cleanable filters
• Filter section with cleanable filters, optional
insulation for indoor installation available
• Filter section with pleated filters, optional
insulation for indoor installation available
• Roof curbs 14” and 24” high galvanized steel
with optional duct support rails, optional
pitch curbs
Intake & Discharge Dampers
• Used to stop air from migrating into
heater and building when in off mode.
• DX and chilled water cooling section
• Discharge-air diffusers
• High-pressure gas regulator over 5 psi
Intake Hood (with filters)
• Used for outdoor applications to eliminate
snow and water from falling into heater.
Also filters fresh air when filter option
is used.
• Burner ON/OFF inlet-air temperature ductstat
economizer
• CFA vertical mounting stand with
filter supports
• Low temperature blower safety-shutdown
control with bypass timer
• Totally enclosed blower motors
• Spring isolation
• Control-circuit power transformer
Discharge Diffusers
• Used to help distribute air into the building.
• Adjustable drive on 25 horsepower or larger
• Insulated casing: 1” - 1.5” insulation with G-90
galvanized steel interior liner
Filter Sections
• Evaporative Cooling
• Used to filter fresh air.
• High temperature design
• Other options and accessories available
on request
Evaporative Cooling
• Used to deliver cool and humidified air,
typically in regions with a hot dry climate.
8
High Temperature Direct Fired Design
• Rupp Air’s versatile High Temperature Design is available
on all 4 Direct Fired Systems (100%, Two Speed, VAV, 80/20)
• This design is ideal for paint booth operations, drying
enclosures and industrial process heating operations.
• High Temperature design allows up to a 180˚F
d i scharge temperature
• Each High Temperature unit is built with double wall
construction to protect insulation and keep casing
temperature and heat loss down
• Each unit is built with High Temperature motors for long life
• By using the “M-Series” temperature control system
Rupp Air can build a control panel to fit your needs
DX and Chilled Water
Cooling Coil Sections
• Blow through design
• Pitched stainless steel drain pan
• Full size access doors up and down stream of coil
• Double wall insulated construction
• Available with downturn plenum
• Available common curb mounting
• Intermediate drain pan for stacked coil design
Internally Mounted
Down Discharge Dampers
• No unexpected installation costs with damper selfcontained in unit
• No wiring hassles because all wiring is completed
• Easy maintenance from rooftop
• Low-leakage damper design to insure a tight seal
when unit is off
• Airfoil damper blade design provides energy efficiency
due to low pressure drops along with little air noise
• Available on all Rupp Air models
For additional details on standard features, options and
accessories, please visit us online at
w w w. r u p p a m s . c o m
9
R A M
&
C F A
Custom Built
C o n t ro l
Systems are
also available
to meet your
R e q u i re m e n t s .
Control
Systems
402M Room-Override
Discharge Air Control
This control system is used for building exhaust-air
replacement to maintain a constant supply air discharge
10
401M Discharge
Air Temperature Control
temperature with the ability to supply supplemental
This control system is used for building exhaust-air
commonly used with the Constant Volume, Two Speed
replacement to maintain a constant supply air discharge
or Variable Air Volume Systems. By setting the desired
temperature. The 401M control is most commonly used
discharge temperature on the remote set point dial, the
with the Constant Volume, Two Speed or Variable Air
burner flame modulates to compensate for change in
Volume Systems. By setting the desired discharge
outdoor temperatures. At the same time a room override
temperature on the remote set point dial, the burner
thermostat senses space temperature and will raise
flame modulates to compensate for change in outdoor
discharge set point for more heat to maintain space
temperatures. A manual SUMMER-OFF-WINTER
temperature. A manual SUMMER-OFF-WINTER selector
selector switch controls the blower and burner operation,
switch controls the blower and burner operation, terminals
terminals are provided to integrate operation with
are provided to integrate operation with exhaust system.
exhaust system. The remote control panel comes
The remote control panel comes complete with temperature
complete with temperature selector dial, indicating lights
selector dial, indicating lights and SUMMER-OFF/WINTER
and SUMMER-OFF/WINTER selector.
selector, along with a room override thermostat panel.
space heating when needed. The 402M control is most
charge-air temperature to compensate for changing
building heat losses or gains. High and low discharge
air sensor probes limit maximum and minimum dischargeair temperatures. A manual SUMMER-OFF-WINTER
selector switch controls the blower and burner operation,
terminals are provided to integrate operation with
403 Constant Operation
Room-Temperature Control
This control system is used for building exhaust-air
replacement with modulated space-temperature control.
The 403M control can be used with all of RAMS systems
when space temperature control is most important. A
modulating space thermostat adjusts burner flame to
maintain discharge-air temperature to compensate for
exhaust system. During night operation a lower space
temperature can be maintained using an On-Off room
thermostat that cycles the heating system on to maintain
minimum space temperature. Remote vented control
panel comes complete with modulating space thermostat,
On-Off night thermostat and time clock mounted inside
panel with indicating lights and SUMMER-OFF/WINTER
selector on face of control panel.
changing building heat losses or gains. High and low
discharge air sensor probes limit maximum and minimum
discharge-air temperatures. A manual SUMMER-OFFWINTER selector switch controls the blower and burner
operation, terminals are provided to integrate operation
with exhaust system. The remote control panel comes
complete with modulating space thermostat, indicating
lights and SUMMER-OFF/WINTER selector. A remote
temperature senor is also available so that control panel
can be mounted in shop office or mechanical room.
M-Series Discharge
Air Temperature Control
This control system is used for building exhaust-air
replacement to maintain a constant supply air discharge
temperature. The M-Series control can be used with all
of RAMS systems however are most commonly used for
paint booth and high temperature drying applications.
By setting the desired discharge temperature on the
remote set point touch pad, the burner flame modulates
to compensate for change in outdoor temperatures. The
M-Series control has the ability to be set for multiple temperature set points, ramp speed for burner modulation
404M Day & Night
Space Heating Control
along with displaying discharge temperature on its digi-
This control system is used for building exhaust-air
tal display and more. A manual SUMMER-OFF-WIN-
replacement or for a total building heat system using a
TER selector switch controls the blower and burner
modulating space-temperature control for day and night
operation, terminals are provided to integrate operation
building heating. The 404M control is most commonly
with exhaust system. Remote control panel comes com-
used with the 80/20 System to provide the most energy
plete with digital readout with multiple set point and
efficient operation. During day operation a modulating
touch pad temperature control, indicating lights and
space thermostat adjusts burner flame to maintain dis-
SUMMER-OFF/WINTER selector.
11
R
A
M
Models 10 - 36
Model#
A
B
C
D
E
F
G
H
J
10
70
46
38
18.75
18.75
39.25
30
48
28
12
70
46
38
18.75
18.75
39.25
30
48
28
15
70
46
38
18.75
18.75
39.25
30
48
28
18
82
60
54
22.13
19.13
56
40.5
69.5
28
20
82
60
54
23
25
56
40.5
69.5
28
22
100
79
58
27.5
27.5
76
46.5
69.5
28
25
100
79
58
31.5
31.5
76
46.5
69.5
28
27
100
88
66
34.5
34.5
80
52.5
95.25
28
30
100
88
66
37
37
80
52.5
95.25
28
33
112
98
76
40
43.19
92
59.5
91.25
28
36
112
98
76
43
43.19
92
59.5
91.25
28
Notes
• All external accessories are oversized 1/4” for R.A. and S.A. openings
• All dimensions are specified in inches
• All dimensions are subject to change
12
R
A
M
Models 222 - 236
Model#
A
B
C
D
E
F
G
H
J
222
100
146
58
77
27.5
140
46.5
69.5
28
225
100
146
58
88
31.5
140
46.5
69.5
28
227
100
156
66
96
34.5
152
52.5
64
28
230
100
156
66
104
37
152
52.5
64
28
233
126
184
76
116
43.19
180
59.5
64.75
28
236
126
184
76
122
43.19
180
59.5
64.75
28
Notes
• All external accessories are oversized 1/4” for R.A. and S.A. openings
• All dimensions are specified in inches
• All dimensions are subject to change
For more detailed drawings,
please visit us online at
w w w. r u p p a m s . c o m
13
C
FA
Models 10 - 36
Model#
A
B
C
D
E
H
10
70
50
36
13.25
11.5
76
12
70
50
36
16
13.75
76
15
70
50
36
19
16.25
76
18
82
65
50
22
19.13
76
20
82
65
50
22.75
25
76
22
100
80
50
27.5
27.5
76
25
100
80
50
31.5
31.5
76
27
110
88
60
34.5
34.5
76
30
110
88
60
37
37
76
33
128
112
70
39.81
43.25
76
36
128
112
70
42.81
43.25
76
Notes
• All external accessories are oversized 1/4” for R.A. and S.A. openings
• All dimensions are specified in inches
• All dimensions are subject to change
14
C
FA
Models 222 - 236
Model#
A
B
C
D
E
H
222
100
146
50
77
27.25
76
225
100
146
50
88
31.5
76
227
110
156
60
96
34.5
76
230
110
156
60
104
37
76
233
128
191
70
116
43.25
76
236
128
191
70
122
43.25
76
Notes
• All external accessories are oversized 1/4” for R.A. and S.A. openings
• All dimensions are specified in inches
• All dimensions are subject to change
For more detailed drawings,
please visit us online at
w w w. r u p p a m s . c o m
15
S e l e c t i n g
Selecting The Rupp Air
M a n a g e m e n t S y s t e m To
M e e t Yo u r N e e d s
Rupp Air has developed a simple to use computer
selection program to help you select every type of
direct-fired heater system and configuration outlined
in this catalog. However, before making the proper
RAMS direct-fired heater selection you will need to
know some of the following items.
➊ Determine the best direct-fired heater system
from pages 4-5 that meets your needs.
❷ Calculate desired supply CFM, this will be determined
by your exhaust CFM volume or CFM required to
heat your space such to offset infiltration, additional
CFM may be added to pressurize the space slightly.
❸ Determine temperature rise or BTU’s of heating
required.
– For make-up air applications, temperature rise
(delta T) can be determined by subtracting the entering
16
air temperature (EAT) from the leaving air temperature (LAT) which is typically your winter design
t e mp e r a t u r e .
______ LAT
— ______ EAT
______delta T
– For heating of a space, BTU’s can be calculated
by figuring heat loss in your space and adding this to
the heat required to temper the infiltration CFM (ICFM)
and the exhaust CFM (ECFM) in the space.
______ BTU’s Heat Loss
+ ______ (ICFM + ECFM) x 1.08 x delta T
_ _ _ _ _ _ Total BTU’s
❹ Determine static pressure loss of all external ducting
and accessories (The Rupp Air selection software will
calculate pressure drop through accessories automatically, however a quick reference accessories pressure
drop table is available below).
Accessory Pressure Drops
Item
*Inches WC
Intake Hood with Bird Screen
0.10
Intake Hood with Filters
0.25
V-Bank with Cleanable Filters
0.25
V-Bank with Pleated Filters
0.40
Intake Damper
0.10
Standard Discharge Damper
0.15
Internal Discharge Damper
0.10
Discharge Diffuser
0.25
*Pressure drops estimated at mid range CFM capacity,
for specific pressure drops by CFM and model consult your
local RAMS sales representative or visit our website at
www.ruppams.com
❺ Determine location of unit indoor or outdoor; ground
or roof. (An illustration of options available can be
found on pages 8-9).
❼ Determine supply voltage.
❻ Determine arrangement of unit from drawings below.
❽ Determine control system from pages 10-11.
❾ Determine accessories and options required for
application from pages 8-9.
V1
Top
Discharge
H1
Side
Discharge
H2
Bottom
Discharge
H3
Top
Discharge
V2
Side
Discharge
Rupp Air’s selection program has been designed to
provide you with a complete selection of the heater
that best fits your needs, along with a detailed specification and complete as-built drawings.
If selecting the correct model and horsepower is all
you need at this time, you can simply use the performance data found on pages 18-26. Keep in mind that
“external static pressure” is duct static plus Rupp Air
accessories. After a model has been selected, drawings
for that model can be found on pages 12-15.
Now that you have compiled the required information
you can now effectively size the direct-fired system to
meet your needs using the Rupp Air easy to use stepby-step selection program. For assistance in selecting
a unit, simply contact your local Rupp Air sales office
or call Rupp Air directly at 1.800.291.2452.
17
Performance Summary Chart
CFM R a n ge
18
Model
BTU/hr R a n ge
1000 - 4200
10
43,000 - 640,000
2000 - 5500
12
86,000 - 800,000
3000 - 7000
15
130,000 - 1,140,000
5000 - 11 , 5 0 0
18
216,000 - 1,790,000
7000 - 16,000
20
302,000 - 2,290,000
10,000 - 22,000
22
432,000 - 3,150,000
14,000 - 30,500
25
605,000 - 4,360,000
16,000 - 36,000
27
691,000 - 5,150,000
20,000 - 42,000
30
864,000 - 6,010,000
24,000 - 48,000
33
1,037,000 - 6,870,000
28,000 - 54,000
36
1,210,000 - 7,730,000
22,000 - 44,000
222
950,000 - 6,300,000
30,000 - 56,000
225
1,296,000 - 8,010,000
34,000 - 66,000
227
1,469,000 - 9,440,000
40,000 - 79,000
230
1,728,000 - 11 , 3 0 0 , 0 0 0
54,000 - 90,000
233
2,340,000 - 12,900,000
60,000 - 102,000
236
2,600,000 - 15,440,000
19
20
21
22
23
24
25
26
R U P P
F r o m
A i r
Q u a l i t y
To
H e a t i n g
A n d
A I R
C o o l i n g
Rupp Air Has The Pro d u c t s
To Meet Your Needs
RUPP Air’s products have been designed with the customer in mind, from
industrial and commercial make-up air systems to exhaust fans and a total heat
system. Each piece of equipment undergoes a complete and stringent series of
tests to ensure that the unit is durable and works reliably for years to come.
At RUPP Air, our commitment to continuous innovation in ventilation and air
quality means you can count on us to deliver the best system available.
Rupp Air Warranty
Rupp Air Management Systems, (SELLER),
warrants this equipment to be free from
defects in materials and workmanship, under
normal use and service, for a period of 12
months from the date of shipment. This warranty shall not apply if 1) the equipment is not
installed by a qualified installer per the
SELLER’s Installation Instructions (copy of
which is shipped with the product,) 2) the
equipment is not installed in accordance
with federal, state and local codes and regulations, 3) the equipment is misused or
neglected, 4) the equipment is not operated within its published capacity.
The SELLER shall not be liable for incidental, consequential losses and damages potentially attributable to malfunctioning equipment.
Should any part of the equipment prove to be
defective in material or workmanship within
the 12 month warranty period, upon examination by the SELLER, such part will be repaired
or replaced by the SELLERat no charge. The
BUYER shall pay all labor costs incurred in
connection with such repair or replacement.
Equipment shall not be returned without
SELLER’s prior authorization and all returned
equipment shall be shipped by the BUYER,
F.O.B. West Union, Iowa, freight prepaid.
Warranty Disclaimer
Custom
Built
Stringent
Testing
Reliable
Systems
Quality
Products
Best
Delivery
Superior
Support
Superior
Serviceability
Rupp Air accepts no responsibility for its
products if used improperly or installed other
than by a licensed electrician, nor will Rupp
Air be liable for damage of any kind, special,
indirect or consequential.
27
Direct Fired Large Industrial &
Indirect Fired Horizontal Systems
Modular
Make-Up Air Units
Direct Fired
Vertical Systems
Exhaust
Fans
T h e R e l i a b l e S o u r c e F o r
I n d u s t r i a l V e n t i l a t i o n
17645 Juniper Path • Suite 150 • Lakeville • MN • 55044
p 952.435.0870
p 800.291.2452
f 952.435.0890
www.Ruppams.com • [email protected]
©2003 Rupp Air Management Systems
Printed in the USA
Rupp Air reserves the right to modify the design, materials and/or
specifications as a result of code requirements of product enhancements
resulting from the Company’s ongoing research and development.
June 2003
RAMS/CFA