Sterling Convector FWG-A

Submittal Specification

Product Description

The Sterling FWG-A is a Front Outlet Convector designed for recessed installation with a 4-sided overlap cabinet.

General Specifications

Front and Liner

Style: Front Outlet

Outlet: Stamped Louvers, Pencil Proof

Material Options

Cabinet Front and Liner: 18 Ga./20 Ga. CRS (Standard)
Optional Cabinet Materials: 18 Ga./18 Ga. CRS, 16 Ga./20 Ga. CRS, 16 Ga./18 Ga. CRS, 16 Ga./16 Ga. CRS, 14 Ga./20 Ga. CRS, 14 Ga./18 Ga. CRS, 14 Ga./16 Ga. CRS, 14 Ga./14 Ga. CRS.
Liner Material: Galvannealed Steel
Stainless Steel (SS) Options: Available for 18 Ga./20 Ga., 18 Ga./18 Ga., 16 Ga./20 Ga., 16 Ga./18 Ga., 16 Ga./16 Ga.

Finish Options

Standard Finish: Baked Powder Prime
Optional Finish: Baked Powder Color

Coil

Bronze Header 3/4" NPT with Copper Tube/Aluminum Fins (Mechanically Expanded).

Header Connections

Single Header Both Ends (Standard)
Single Inlet 1 End / Dual Inlet 1 End (Optional)
Dual Inlet Both Ends (Optional)

Optional Accessories

Damper: Damper Blades Factory Installed, Knob Damper (Optional), Tamper Resistant (Optional)

Insulation

Back Only (Optional)
Back, Sides, Top (Optional)

Piping Knockout

Optional

4" End Pockets

Left Hand (LH) (Optional)
Right Hand (RH) (Optional)
Both Ends (Optional)

Perforated Front

Consult Factory. Available in 16 Ga. (Optional) or 14 Ga. (Optional).

Lengths

Available in 20" through 64" in 4" increments.

Model Dimensions and Sizes (TYPE FWG-A)

MODEL	D	L	H	B	J
4xx-18	4-13/16"	20,24,28, 32,36,40, 44,48,52, 56,60,64"	18"	2-1/8"	4"
4xx-20			20"
4xx-24			24"
4xx-26			26"
4xx-32			32"
6xx-18	6-13/16"	20,24,28, 32,36,40, 44,48,52, 56,60,64"	18"	3-1/8"	6"
6xx-20			20"
6xx-24			24"
6xx-26			26"
6xx-32			32"
8xx-18	8-13/16"	20,24,28, 32,36,40, 44,48,52, 56,60,64"	18"	4-1/8"	8"
8xx-20			20"
8xx-24			24"
8xx-26			26"
8xx-32			32"

Note: When adding end pockets, the liner and front length increase.

Steam Ratings

Steam Ratings in BTU/H (215°F at 65°F EAT)

DEPTH IN INCHES	LENGTH IN INCHES	18"	20"	24"	26"	32"
4"	20"	2165	2420	2775	2870	3090
	24"	2675	3050	3550	3645	3945
	28"	3215	3700	4255	4375	4730
	32"	3750	4355	5010	5150	5605
	36"	4235	5005	5760	5905	6440
	40"	4750	5635	6470	6655	7245
	44"	5260	6285	7245	7410	8080
	48"	5775	6890	7950	8185	8885
	52"	6355	7565	8680	8890	9645
	56"	6820	8195	9430	9665	10525
	60"	7425	8845	10135	10395	11285
	64"	7890	9500	10915	11170	12165
6"	20"	3045	3405	4035	4170	4750
	24"	3790	4285	5105	5290	6045
	28"	4555	5190	6155	6340	7220
	32"	5280	6090	7230	7480	8515
	36"	6045	6950	8255	8575	9735
	40"	6815	7875	9325	9690	11005
	44"	7580	8730	10375	10785	12230
	48"	8345	9635	11425	11835	13430
	52"	9160	10515	12450	12860	14605
	56"	9880	11415	13520	14000	15900
	60"	10715	12275	14545	15050	17075
	64"	11460	13200	15620	16210	18395
8"	20"	3670	4130	4685	4775	5400
	24"	4650	5240	5915	6115	6890
	28"	5810	6335	7140	7345	8265
	32"	6880	7445	8390	8660	9755
	36"	7930	8540	9665	9955	11200
	40"	8975	9675	10935	11225	12665
	44"	10045	10765	12140	12500	14110
	48"	10875	11770	13390	13770	15600
	52"	12250	12950	14575	14975	16900
	56"	13300	14110	15890	16340	18440
	60"	14350	15155	17050	17520	19765
	64"	15265	16270	18370	18905	21300

* Correction factors for BTU performance at different Average Water Temperatures require consulting Table 3.

For other applicable Correction factors, refer to the Correction Factors page.

For assistance with ratings and selection, please use the Sterling online Specifier.

Correction Factors

Table 3: Convector Correction Factors (Average Water Temperature vs. Entering Air Temperature)

AVERAGE WATER TEMPERATURE (°F)	ENTERING AIR TEMPERATURE (°F) (STD)
	55°	60°	65°	70°	75°
100°	0.17	0.14	0.12	0.09	0.07
110°	0.23	0.20	0.17	0.14	0.12
120°	0.29	0.26	0.23	0.20	0.17
130°	0.35	0.32	0.29	0.26	0.23
140°	0.43	0.39	0.35	0.32	0.29
150°	0.50	0.46	0.43	0.39	0.35
160°	0.58	0.54	0.51	0.47	0.43
170°	0.67	0.63	0.58	0.54	0.51
180°	0.76	0.71	0.67	0.63	0.58
190°	0.85	0.81	0.76	0.71	0.67
200°	0.95	0.90	0.85	0.81	0.76
210°	1.05	1.00	0.95	0.90	0.85
215° (STD)	1.10	1.05	1.00	0.95	0.90
220°	1.15	1.10	1.05	1.00	0.95
230°	1.26	1.20	1.15	1.10	1.05
240°	1.37	1.32	1.26	1.21	1.15
250°	1.47	1.43	1.37	1.32	1.27

Table 4: Correction Factors for Steam Pressures Other Than 1 PSI Gauge

PRESSURE PSI GAUGE	5	10	15	20	25	50
FACTOR	1.12	1.25	1.36	1.46	1.56	1.93

*Apply factors shown above to the ratings shown on the 215°F ratings page.

Note: Maximum Recommended operating pressure is 150 PSIG (365.9°F). For conversion from steam to hot water, use correction factors shown in Table 3.

Table 5: Correction Factors for Access Doors

Length	Free Standing, Non-Recessed Non-Standard Access Door Locations				Semi-Recessed or Fully Recessed Non-Standard Access Door Locations
Length	3 or 4	3 & 4	5 or 6	5 & 6	3 or 4	3 & 4	5 or 6	5 & 6
20"	0.940	0.880	0.820	0.650	0.975	0.950	0.925	0.850
24"	0.950	0.910	0.860	0.720	0.980	0.960	0.940	0.880
28"	0.960	0.920	0.890	0.770	0.982	0.968	0.948	0.902
32"	0.970	0.940	0.890	0.800	0.985	0.972	0.955	0.918
36"	0.970	0.940	0.920	0.830	0.988	0.975	0.962	0.925
40"	0.970	0.950	0.920	0.850	0.990	0.978	0.970	0.932
44"	0.980	0.950	0.930	0.860	0.990	0.980	0.970	0.940
48"	0.980	0.960	0.940	0.880	0.990	0.982	0.970	0.948
52"	0.980	0.960	0.950	0.890	0.992	0.985	0.978	0.955
56"	0.980	0.960	0.950	0.890	0.992	0.985	0.978	0.955
60"	0.980	0.970	0.950	0.900	0.992	0.985	0.978	0.955
64"	0.980	0.970	0.950	0.910	0.992	0.988	0.978	0.962

Note: Derating factors do not apply to units with end pockets.

Table 6: Pressure Loss in Feet of Water

WATER FLOW IN GPM	4 INCH MODELS	6 INCH MODELS	8 INCH MODELS
0.25	0.044	--	--
0.50	0.160	0.070	0.046
1	0.597	0.270	0.167
2	2.220	1.047	0.616
3	--	2.260	1.367
4	--	3.793	2.380
5	--	--	3.673

Charted figures show pressure drop through Convectors with forced hot water, used for determining pressure head requirement. Based on 64" length units, but applicable to shorter units as most loss is due to headers.

Output and Flow Rate Information

Table 7: Gallons Per Minute of Hot Water Required

This section presents a graph illustrating the relationship between Gallons Per Minute (GPM) and MBH (Thousand BTU per Hour) for various water temperature drops (10°F, 20°F, 30°F, 40°F). For example, a 10°F temperature drop requires approximately 0.200 GPM per MBH.

Table 8: Output-Flow Rate Corrections

Convector Depth	Tubes per Element	GPM (Min. Flow Rate 0.25 Ft./Sec.)	MBH Based on T.D. & Min. Flow Rate
Convector Depth	Tubes per Element	GPM (Min. Flow Rate 0.25 Ft./Sec.)	10TD	20TD	30TD	40TD
4"	2	0.15	0.750	1,500	2,250	3,000
6"	3	0.225	1.125	2,250	3,375	4,500
8"	4	0.30	1.500	3,000	4,500	6,000

Note: Table 8 shows MBH values that result at specific water temperature drops and minimum water flow rates required to maintain turbulent flow within element tubes.

Convector Coil Details

Coil Construction

The convector coil features elements with copper tubes and aluminum fins, mechanically expanded. Coil fins are 2-1/2" high and are bonded to copper tubes at 6 fins per inch.

Coil Element Types

4" Depth: 2 Tube Element (3 3/4" overall width)
6" Depth: 3 Tube Element (5 3/4" overall width)
8" Depth: 4 Tube Element (7 3/4" overall width)

Diagram Description

A diagram illustrates the convector coil's dimensions, including end-to-end length (liner length less 1/2"), riser centers (liner length less 2 1/2"), and typical 3/4" NPT connection points. It also shows optional components such as a vent plug and a 3-position hanger welded to the liner.

Note: When ordering convectors with end pockets, always refer to the standard unit length. The overall physical length will increase by 4" for each end pocket. The coil length will remain the standard size.

Manufacturer Information

Manufacturer: STERLING COMMERCIAL HYDRONIC PRODUCTS

Address: 260 North Elm St., Westfield, MA 01085

Phone: (413) 564-5535

Website: www.sterlingheat.com

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