McQuay 5GA User Manual
Catalog
413-4
McQuay®Steam Coils
Types HI-F5, HI-F8 & E-F5
HI-F5, HI-F8 & E-F5 steam coils HI-F5, HI-F8 & E-F5 steam coils
SelectTOOLSTM for
Contractor Coils
McQuay offers an unmatched variety of standard fin spacings,
row and circuiting combinations. For optimum coil selection,
McQuay's SelectTOOLSTM for Contractor Coils selection program makes it easy to select the most economical standard or
special application coil to meet your job requirements.
Contact your local McQuay representative for a coil selection
that meets the most exacting specification.
ARI certification
McQuay steam coils are certified in accordance with the forced
circulation air cooling and air heating
coil certification program, which is
based on ARI Standard 410.
To obtain ARI certification ratings, it is
first necessary to have the testing facilities reviewed for proper instrumentation, control and accuracy of test data.
A coil is then submitted to an ARI
approved independent testing facility
for comparative tests. ARI then
approves the coil manufacturer’s testing facilities. After the testing facilities are approved, the coil is tested over a wide range
of operating conditions. All rating data is the reviewed by ARI
engineers for accuracy and confirmation that procedures established by ARI have been followed. Periodic check lists of production coils by ARI, on a random basis, assures compliance
with ARI standards.
SelectTOOLSTM.........................................................1
ARI certification..........................................................1
Nomenclature .............................................................2
Standard availability chart......................................3, 4
Design features ......................................................3, 4
Steam circuiting arrangements ..................................5
General specifications ...............................................6
Coil selection considerations......................................7
Sample coil selection and general formulas...............8
Conversion of air volume to standard air ...................9
Capacity data ...........................................................10
Hl-F5 capacity curves...............................................10
E-F5 capacity curves................................................11
HI-F8 capacity curves............................................. 12
Condensate loading factors .....................................13
Air pressure drop..................................................... 14
Coil selection data ................................................... 16
Dimensional data .................................................... 17
Piping data.............................................................. 19
Engineering guide specifications............................. 21
Note: special application coils may be outside the scope of ARI
Standard 410.
“McQuay" and "HI-F" are registered trademarks of McQuay International, Minneapolis, MN.
The McQuay HI-F fin surface is covered by U.S. Patent No. 3,645,330.
Copyright © 2001 McQuay International. All rights reserved throughout the world.
Bulletin illustrations cover the general appearance of McQuay International products at time of publication
and we reserve the right to make changes in design and construction at any time without notice.
Catalog 413 / Page 1
A pioneer in corrugated fin development A pioneer in corrugated fin development
HI-F Means High Efficiency
A principal factor governing fin heat transfer efficiency is the
boundary layer film of air adhering to any fin surface. This
boundary layer insulates the fin, severely reducing the rate
of heat exchange.
The advanced rippled-corrugated HI-F design creates a
state of continuous turbulence which effectively reduces the
boundary layer formation. The exclusive rippled edge
instantly deflects the incoming air to create initial turbulence.
A succession of corrugations across the fin depth, in conjunction with the staggered tubes, increases the turbulating
effect and eliminates the "dead spots" behind the tubes. In
this manner, the HI-F design establishes a high standard in
heat transfer efficiency yielding sharply increased performance. The rippled fin edge also strengthens the fin edge
and provides a pleasing overall appearance.
E-F Means Energy Efficient
The term "energy efficient," which is used to describe how
well a system utilizes energy, has become a common
expression in the HVAC industry.
With costs of energy rising, the need for cutting operating
expenses is apparent. Lowering the air pressure drop
across the face of the coil will reduce the fan brake horsepower requirement and fan motor electrical demand. The
need to cut operating energy expenses is met by the E-F fin
surface. The smoother fin design of the E-F surface results
in lower operating costs over the life of the equipment.
NomenclatureNomenclature
TUBE O.D.:
5 = 5/8 inch
8 = 1 inch
COIL TYPE:
5SA = Single tube, opposite end
5JA,8JA = Distributing tube, same end
8RA = Distributing tube, opposite end
5HA = High pressure construction,
5GA,8GA = High pressure construction,
8TA = High pressure construction,
Page 2 / Catalog 413
connection
connection
connection
single tube, opposite end connection
distributing tube, same end connection
distributing tube, opposite end connection
5 SA - 12 02 C - 033.00 - 090.00
FINS PER INCH:
HI-F5, E F5 (06, 07, 08, 09, 10, 11, 12, 13, 14)
HI-F8 (03, 04, 05, 06, 07, 08, 09, 10, 11, 12, 13, 14)
FINNED LENGTH (INCHES)
FIN HEIGHT (INCHES)
FIN DESIGN:
B = 01 & 02 ROW E-F5
C = 01 & 02 ROW HI-F5
B = 01 ROW HI-F8 (1”)
ROWS DEEP:
HI-F5, E-F5 (01, 02)
HI-F8 (01)
Standard availability chart Standard availability chart
COIL TYPE
COIL MODEL 5SA 5HA 5JA 5GA 8JA 8GA 8RA 8TA
SERPENTINE CIRCUIT Does not apply Does not apply
ROWS 1,2 1,2 1
CONNECTION
LOCATION
FIN HEIGHT
3" INCREMENT
FINNED LENGTH
1-1/2" INCREMENT
FIN TYPE
ALUMINUM
FINS
COPPER
SPACING
(FPI)
DIAMETER 5/8 5/8 1
FACE C/C 1.5 1.5 3.0
COPPER
TUBING
ADMIRALTY BRASS .049 ll ll
CUPRO-NICKEL
HEADERS STANDARD MAT'L Copper Cu Ni Copper Cu Ni Copper Cu Ni Copper Cu Ni
MAXIMUM STD.
OPERATING LIMITS
HI-F
E-F
.0075
.0095
.0120
.006 ll
.0075 ll
.0095 ll
.020
.025
.035
.049 ll ll ll ll
.020 ll ll
.032 ll ll
.035 ll ll
.049 ll ll ll ll
P 150 Psig 350 Psig 150 Psig 350 Psig 150 Psig 350 Psig 150 Psig 350 Psig
T 366 F 450 F 366 F 450 F 366 F 450 F 366 F 450 F
STEAM
(SINGLE TUBE)
Opposite End Same End Same End Opposite End
12-42
12-129
ll ll ll ll
ll ll ll ll
ll ll ll ll
ll ll ll
ll ll ll ll* ll* ll* ll*
ll ll ll ll* ll* ll* ll*
6,7,8,9,10,11,12,13,14 3,4,5,6,7,8,9,10,11,12,13,14
ll
ll
ll
ll
ll ll ll
ll
STEAM
(DISTRIBUTING TUBE)
ll ll ll ll
ll* ll* ll* ll*
ll ll ll
ll
ll Feature Available
* Requires 6 fins per inch or more.
Flexibility
Along with the standard offerings, optional materials and special configurations are provided to meet many different specifications. Extra long finned lengths, intermediate tube supports, along with a wide variety of tube wall and fin thicknesses are available. Casings can be constructed of galvanized steel, aluminum, stainless steel or copper. Optional connection materials such
as steel, red brass or copper (sweat) are offered along with butt-weld, victaulic or flange type connections. Coil coatings can be
phenolic or Electro Fin. These are just a few of the options and specials that can be provided. Consult your local representative
for your special coil requirements.
*Note: Special application coils may be outside the scope of ARI standard 410.
Catalog 413 / Page 3
Design features
PATENTED FIN DESIGNS
The HI-F and E-F fin surfaces give the flexibility needed to perform at optimum efficiency. Seamless drawn copper tubes are
mechanically expanded into full drawn, die-formed fin collars to
provide positive metal-to-metal contact for high heat transfer
efficiency and long coil life.
PITCHED IN THE CASING
The specially designed casing automatically provides the
proper pitch for positive condensate removal resulting in
reduced installation and expense. Supply and return connections are properly sized for each coil to assure optimal distribution and proper condensate removal.
STAGGERED TUBE DESIGN FOR HIGH PERFORMANCE
The more moving air in contact with tubes in the coil, the more
performance obtained from the total available surface. The
staggered tube design exposes the tubes to more moving air
than the in-line design. The geometry of the staggered design
also allows the rows to be spaced closer together. This results
in a more compact coil providing higher capacities.
BRAZED COPPER TUBES-TO-COPPER HEADER JOINT
Seamless copper tubes brazed into heavy-gauge seamless
drawn copper headers. This combination of similar metals eliminates unequal thermal expansion and greatly reduces stress in
the tube-header joint. Intruded tube holes in the header allow
an extra large mating area for increased strength and flexibility
designed to provide many years of trouble-free service.
FREE FLOATING CORE
One of the most important requirements of a steam coil design
is to allow for thermal expansion without creating stress and
wear on the tubes.
To provide for this requirement, the coil core must be free to
expand and contract within the casing without inducing wear
on the tubes. A special coil casing has been designed in which
the coil core is free to float in a recessed fin channel. Since the
core is not supported by the tubes there is no resultant tube
wear. The recessed fin channel prevents air bypass while adding structural support to the casing.
Page 4 / Catalog 413
Steam circuiting arrangements Steam circuiting arrangements
Select Hl-F5, E-F5 and HI-F8 steam coils from three different circuiting arrangements: the general purpose 5SA coil, and two jet
tube steam distributing styles-5JA, 8JA and 8RA coils-intended for both general and special purpose heating. While each of
these arrangements has been carefully designed to serve a particular area in steam coil application, sufficient similarities are
present in design and performance to render them interchangeable in many cases. Optimal fin design provides a high performing heat transfer surface while a host of exclusive features provide extended coil life.
5SA & 5HA GENERAL PURPOSE STEAM COILS
5SA and high pressure 5HA steam coils are specifically
designed for economical general purpose heating. Featuring high quality and high capacity, they are an ideal choice
for all regular steam applications - heating, reheating,
booster and process use.
The sectional diagram illustrates the steam circuiting of
this single tube design. A perforated plate type steam baffle directly behind the supply connection ensures even
steam pressure across the entire header length. Inlet tube
orifices meter a uniform flow of steam into each tube.
5JA, 8JA, 5GA & 8GA
JET TUBE DISTRIBUTING COILS
5JA, 8JA and high pressure 5GA and 8GA jet tube steam
distributing coils are excellent for any general purpose
heating application. With the superior freeze resistance
provided by the tube-within-a-tube construction, they are
ideal for low temperature preheating and special process
applications.
The construction, as illustrated, features directional orificed inner tubes, a unique elliptical supply header located
inside the heavy-duty return header and a circuiting
arrangement which provides both supply and return connections at the same end of the coil.
8RA & 8TA OPPOSITE END CONNECTION
JET TUBE DISTRIBUTING COILS
8RA and high pressure 8TA jet tube steam distributing
coils are very similar in design and operation to the "JA"
coils except that supply and return connections are
located on opposite ends.
The directional orifices properly meter steam along the
entire tube length to assure a consistent temperature rise
across the full coil face and accelerate condensate
removal. This important feature is standard on all of our jet
tube steam distributing coils.
Catalog 413 / Page 5
General specifications General specifications
1. PRIMARY SURFACE
5/8” O.D. and 1” O.D. round seamless copper tubes.
Cupro-nickel tubes are used for high pressure construction. Tubes are mechanically expanded to provide a continuous compression bond to the fins.
2. SECONDARY SURFACE
HI-F5, E-F5 and HI-F8 rippled-corrugated aluminum dieformed plate type fins. Fin collars are full drawn to provide
accurate control of fin spacing and maximum contact with
tubes.
3. HEADERS
Extra-heavy seamless copper tubing with intruded tube
holes. Provides flexibility for uneven stress during coil
expansion and contraction. Cupro-nickel used for high
pressure construction.
4. HEADER END CAPS
Heavy-gauge, die-formed copper. Monel used for high
pressure construction.
5. CONNECTIONS
Steel male pipe supply and return connections properly
sized for coil capacity. Other materials available on
request. (Red brass connections recommended for coils
used with non-ferrous piping.)
6. STEAM BAFFLES
Supply header baffle disperses entering steam. Prevents
blow-through or short circuiting and ensures equal steam
distribution to all coil tubes.
7. BRAZING
All core joints are brazed with copper brazing alloys.
Headers have intruded tube holes which provide maximum brazing surface and ensure lasting strength.
8. CASINGS
Die-formed heavy-gauge continuous galvanized steel
with reinforced flanges and 3/8” x 3/4” slots on 6” centers for easy mounting. Fin channels brace the core
assembly in the casing, preventing air bypass and
damage in handling.
9. PITCHED IN CASING
Coil cores are pitched in the casing toward the return
connection for horizontal airflow. Provides proper condensate drainage and ease of installation.
10. FREE FLOATING CORE
Design permits coil core to “float” free in the coil casing
during expansion and contraction.
11. TESTS
Complete coil tested leak free at 315 psig air pressure
under warm water containing special wetting agent.
12. OPERATING CONDITIONS
Standard coils rated up to 150 psig and up to 366°F
temperatures. High pressure coils up to 350 psig and
450°F. When steam pressure is above 25 psig, high
pressure coils are recommended for longer coil life.
Page 6 / Catalog 413
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