Rows
• Horizontal rows of tubes in the fin pack
• Chilled Water and DX Coils – 1 to 12 rows
• Hot Water Coils – 1 to 12 rows
• Steam Coils – 1 to 2 rows
• Condenser Coils – 1 to 12 rows
FPI – Fins Per Inch
• 1/2" OD tube coils - 10 to 16 fins per inch
• 3/8” OD tube coils - 10 to 20 fins per inch
• 5/8” OD tube coils - 6 to 14 fins per inch
• Standard fins are .006” die formed aluminum with
collared tube holes
• Optional fins are .008 and .010” aluminum and .006”
copper
• Contact factory for special fin materials and fin coatings
FH – Fin Height
Fin heights are dictated by our tube patterns
• For 5/8" tube coils, fin heights are available in increments
of 1.50”
• For 1/2" tube coils, fin heights are available in increments
of 1.25”
• For 3/8" tube coils, fin heights are available in increments of 1.00"
FL – Fin Length
Fin length can be any size. Center supports (also called tube
supports) are required for every 50” of fin length. A
center support is sheet metal with tube holes used to support
the middle of the fin pack.
SP1, SP2 – Sideplate Flanges
• Standard flanges are typically 1-1/2” and stackable.
Minimum stackable flange is 1/2”
• Inverted, flat sideplate flanges are typically 1”
and Casing Height (CH) is increased on both sides by the 1/16”
thickness of the metal (e.g. 9” Fin Height + Inverted
Flat Side Plates = 9 1/8” Casing Height)
• Available casing materials are 16 gauge galvanized steel
and 16 gauge stainless steel
Contact Factory for other casing materials
FAQ: Why are top and bottom flanges called side plates?
ANSWER: When our coil builders are expanding the tubes
to the fins at the factory, the coil face lays flat on the table,
so the top and bottom flanges are actually viewed as side plates.
EP1, EP2 – End Plates (also called tube sheets)
• Standard flanges are usually 1 1/2" and made of 16 gauge
galvanized steel
• 16 gauge stainless steel end plates are also available
CH – Casing Height
• For coils with stackable flanges, casing height is calculated
as follows:
CH = SP1 + FH + SP2
(e.g. SP1 = 1.5, FL = 30, SP2 = 1.5)
CH = 33
• For inverted flat casing, casing height is calculated
as CH = FH + 1/8
CL – Casing Length
CL = EP1 + FL + EP2
CD = Casing Depth
Standard coil casing depths are as follows
Rows Deep |
“CD” Dim |
1 |
5 |
2 |
6-1/2 |
3 |
6-1/2 |
4 |
7-1/2 |
5 |
7-1/2 |
6 |
10 |
8 |
12 |
10 |
15 |
NOTE: These dimensions were chosen to ensure that headers remain
inside the casing, however; modifications can be made as long
as:
CD > Fin Pack
Where CD is Casing Depth
Fin pack = (No. Rows)* (Centerline Distance between Rows)
Max
• MAX is the dimension from the edge of the fin pack to
the outside of the return bend. A return bend is simply a bent
copper tube connecting two adjacent rows
• Minimum MAX dimension is 1.5”
• Typical MAX dimension is 2.25”
Sometimes the flange, EP1 exceeds the MAX dimension. In such
a case, substitute the MAX dimension with EP1
“C” Dimension
• “C” is the dimension from the edge of the
fin pack to the outside of the header. For opposite end connection
coils, there would be two “C” dimensions –
C1 and C2. Attached to the header are copper tubes or “adapter”
tubes which connect the coil tubes to the header
• Standard adapter tube lengths are 3 1/8” and 1
7/8”
example: Coil has a 1 1/8” header with 3 1/8”
adapter tubes
C = 1 1/8 + 3 1/8 = 4 3/8
NOTE: All double circuit coils to have a minimum adapter
tube length of 3 1/8”.
OAL – Overall Length
• For same end connection coils, overall length is the
dimension from the edge of the return bends on one end to the
outside of the header on the other end.
OAL = MAX + FL + C
example: MAX = 2 1/4 + FL = 48 + C = 4 3/8; OAL = 54 5/8
• For opposite end connection coils, overall length measures
from the outside of the header on one end to the outside of
the header on the opposite end.
OAL = C1 + FL + C2
example: C1 = 3 1/8 + FL = 48 + C2 = 3 1/8; OAL = 54 1/4
- Note that connection length “L” is not included
in the "OAL" dimension.
L-Connection Length
• Coil connections are typically copper or steel. Copper
connections can be made any length down to a certain minimum.
• Steel Connections have fixed lengths as shown in the
chart below.
• Standard connection types for various Greenheck Coils
:
• Water and Steam Coils – Copper MPT connections
(with option for Copper FPT, Copper Sweat or Steel MPT connection).
• DX Coils – Supply connections are brass distributors
with removable type orifice and an optional side port connection
for hot gas bypass. Suction headers have Copper SWEAT connections.
• Condenser & Heat Reclaim Coils – Copper SWEAT
connections.
Typical Connection Lengths for Standard OD Connection
Sizes
Conn
Dia.
|
STD
MPT
“L” Dim.
|
STD
FPT
“L” Dim.
|
Absolute
Minimum
“L” Dim. |
3/4 |
2 |
2 |
1-1/4 |
1 |
2 |
2-1/4 |
1-1/4 |
1-1/4 |
3 |
2-1/2 |
1-1/2 |
1-1/2 |
3-1/4 |
2-1/2 |
1-5/8 |
2 |
3-1/2 |
3 |
1-3/4 |
2-1/2 |
3-1/2 |
3-1/4 |
2 |
3 |
4 |
3-1/4 |
2 |
Connection Sizes-Header Diameters
•As shown in the chart, standard MPT and FPT connection
diameters (OD’s) range from 3/4” to 3”. Contact
factory for special connection sizes.
• For water coils, connection sizes are typically sized
based on GPM of water.
| GPM |
1-4 |
4-8 |
8-16 |
16-30 |
30-40 |
40-75 |
75-100 |
| Conn. |
3/4 |
1 |
1-1/4 |
1-1/2 |
2 |
2-1/2 |
3 |
For SWEAT connections and header diameters add, 1/8”
to the standard connection size.
Header OD = Connection Size + 1/8”
Sweat Connection = Connection Size + 1/8”
(e.g. Coil with 1” MPT connections, header OD = 1 1/8”
Exceptions: Non-Freeze Steam Distributing coils have fixed
header diameters regardless of connection size.
1 Row Steam Dist. Coil = 2 5/8” OD Header, unless supply
is 3" then header is 3 1/8".
2 Row Steam Dist. Coil = 3 1/8” OD Header
“S” and “R” – Connection
Locations
Connection locations may vary according to whether you are replacing
an existing coil or designing a new coil. For Greenheck Coils,
standard connection locations “S” and “R”
are determined from the centerline of the connection relative
to the top & bottom of the casing.
• Typically, for Water Coils, Standard Steam, Direct Expansion,
& Condenser Coils
•S or R = 1/2 (Conn size OD) + .5
(e.g. Conn Size = 2, S = 1.5)
- Typically, for Steam Distribution Coils
S + 1/2 (Casing Height)
R + 1/2 (Conn Size OD) .5
“E”and “F” – Connection
Locations
“E” & “F” dimensions are determined
from the centerline of the connection relative to the sides
of the casing. These dimensions are probably the most “mysterious”
of all coil dimensions, for they are dependent on many factors
– number of rows, tube pattern, header diameter, type
of offset adapters available, etc.
The following schematic and respective formulas should help
in calculating “E”and “F”.
X = (No. Rows –1) * (Distance between rows)
For 5/8” tube coils, distance between rows = 1.299
For 1/2” tube coils, distance between rows
= 1.082
For 3/8" tube coils, distance between rows = 0.866
For 1 row coils – “E” and “F”
= 1/2 (CD) +/- (Offset Option)
For 2-12 row coils - “E” and “F” =
1/2 (CD – X+ +/- (Offset Option)
Note: Offset Option - Offset adapters are required if the header
diameter is greater than the dimension “X”.
Standard offsets for Greenheck Coils
5/8” tube – 0.75, 1.30, 2.05, 2.60
1/2” tube – 1.08, 2.16
NOTE: All standard offset adapters are 3 1/8” long
Greenheck Coils can provide special offset adapters if required.
For special offsets contact the factory
