Sterling W-A Convector

Submittal Specification

Flat Top Cabinet Wall Mounted

Specifications

Front and Liner

STYLE: Front Outlet
OUTLET: Stamped Louvers, Pencil Proof

Lengths

20" thru 64" in 4" Increments

Material (Cabinet Front and Liner)

18 Ga./20 Ga. CRS (Std)
18 Ga./18 Ga. CRS (Opt'l)
16 Ga./20 Ga. CRS (Opt'l)
16 Ga./18 Ga. CRS (Opt'l)
16 Ga./16 Ga. CRS (Opt'l)
14 Ga./20 Ga. CRS (Opt'l)
14 Ga./18 Ga. CRS (Opt'l)
14 Ga./16 Ga. CRS (Opt'l)
14 Ga./14 Ga. CRS (Opt'l)
18 Ga./20 Ga. SS (Opt'l)
18 Ga./18 Ga. SS (Opt'l)
16 Ga./20 Ga. SS (Opt'l)
16 Ga./18 Ga. SS (Opt'l)
16 Ga./16 Ga. SS (Opt'l)

Finish

Baked Powder Prime
Baked Powder Color (Opt'l)

Coil and Connections

Element/Coil

Bronze Header 3/4" NPT w/Copper Tube/Alum Fins (Mechanically Expanded).

Header Connections

Single Header Both Ends (Std)
Single Inlet 1 End / Dual Inlet 1 End (Opt'l)
Dual Inlet Both Ends (Opt'l)

Piping Knockout

(Opt'l)

4" End Pockets

LH (Opt'l)
RH (Opt'l)
Both Ends (Opt'l)

Perforated Front

Consult Factory
16 Ga. (Opt'l)
14 Ga. (Opt'l)

Optional Accessories

Damper

Damper Blades Factory Installed
Knob Damper (Opt'l)
Tamper Resistant (Opt'l)

Access Doors

(Opt'l)

Insulation

Back Only (Opt'l)
Back, Sides, Top (Opt'l)

Model Dimensions - Type W-A

Dimensions (D, L, H, B, J) for Type W-A models. Note: When adding end pockets, liner and front length increase.

Model Series	D (in)	L (in)	H (in)	B (in)	J (in)
4xx-14	14	20-64 (4" increments)	14	2-1/8	2
4xx-18	18	20-64 (4" increments)	18	2-1/8	2
4xx-20	20	20-64 (4" increments)	20	2-1/8	2
4xx-26	26	20-64 (4" increments)	26	2-1/8	2
4xx-32	32	20-64 (4" increments)	32	2-1/8	2
6xx-14	14	20-64 (4" increments)	14	3-1/8	4
6xx-18	18	20-64 (4" increments)	18	3-1/8	4
6xx-20	20	20-64 (4" increments)	20	3-1/8	4
6xx-26	26	20-64 (4" increments)	26	3-1/8	4
6xx-32	32	20-64 (4" increments)	32	3-1/8	4
8xx-14	14	20-64 (4" increments)	14	4-1/8	6
8xx-18	18	20-64 (4" increments)	18	4-1/8	6
8xx-20	20	20-64 (4" increments)	20	4-1/8	6
8xx-26	26	20-64 (4" increments)	26	4-1/8	6
8xx-32	32	20-64 (4" increments)	32	4-1/8	6

Diagram Description: The diagram illustrates the physical layout and key dimensions of the W-A convector, including overall length, riser centers, header placement, and depth indicators. Notes indicate that end pockets increase overall length but not coil length.

Steam Ratings (BTU/H)

Ratings are provided for 215°F water temperature at 65°F Entering Air Temperature (EAT). Correction factors for other temperatures and pressures are available in separate tables.

Depth (in)	Front Outlet, Wall Mounted, Nominal Height - TYPE W-A
Depth (in)	14"	18"	20"	26"	32"
4	2495	2830	2930	3120	3265
	3145	3625	3720	3985	4150
	3815	4345	4465	4775	5040
	4490	5110	5255	5665	5950
	5160	5880	6025	6505	6865
	5810	6600	6790	7320	7730
44	6480	7390	7560	8160	8640
48	7105	8110	8350	8975	9530
52	7800	8855	9070	9745	10345
56	8450	9625	9865	10630	11305
60	9120	10345	10610	11400	12120
64	9790	11135	11400	12290	13080
20	3625	4250	4390	4850	5040
24	4560	5375	5570	6170	6410
28	5520	6480	6670	7370	7655
32	6480	7610	7870	8690	9025
36	7390	8690	9025	9935	10345
40	8375	9815	10200	11230	11665
44	9290	10920	11350	12480	12985
48	10250	12025	12455	13705	14305
52	11185	13105	13535	14905	15505
56	12145	14230	14735	16225	16920
60	13055	15310	15840	17425	18145
64	14040	16440	17065	18770	19585
20	4535	5040	5135	5570	5810
24	5760	6360	6575	7105	7465
28	6960	7680	7895	8520	8930
32	8185	9025	9310	10055	10560
36	9385	10390	10705	11545	12120
40	10630	11760	12070	13055	13655
44	11830	13055	13440	14545	15190
48	12935	14400	14810	16080	16800
52	14230	15670	16105	17425	18145
56	15505	17090	17570	19010	19850
60	16655	18335	18840	20375	21215
64	17880	19750	20330	21960	22895

Correction Factors

Table 3: Convector BTU Correction Factors (Temperature)

Correction factors based on Average Water Temperature and Entering Air Temperature (Standard conditions: 215°F water, 65°F EAT).

AVERAGE WATER TEMPERATURE (°F)	ENTERING AIR TEMPERATURE (°F) (STD)
AVERAGE WATER TEMPERATURE (°F)	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

Apply factors shown above to the ratings shown on the 215°F ratings page. Maximum recommended operating pressure is 150 PSIG, (365.9°F). For conversion from steam to hot water, use correction factors shown in Table 3.

PRESSURE PSI GAUGE	5	10	15	20	25	50
FACTOR	1.12	1.25	1.36	1.46	1.56	1.93
BTU PER SQ. FT.	269	301	327	351	374	463

Table 5: Correction Factors for Access Doors

Factors for Free Standing, Non-Recessed Non-Standard Access Door Locations and Semi-Recessed or Fully Recessed Non-Standard Access Door Locations. Derating factors do not apply to units with end pockets.

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

Pressure Loss (Hot Water)

Pressure loss in feet of water for different flow rates (GPM) in 4", 6", and 8" models. Used for determining pressure head requirements. Based on 64" length units, but applicable to shorter units as most loss is due to headers.

WATER FLOW IN GPM	PRESSURE LOSS IN FEET OF WATER
4 INCH MODELS	6 INCH MODELS	8 INCH MODELS
.25	0.044	--	--
.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

Flow Rate Corrections

Table 7: Gallons Per Minute of Hot Water Required

This graph illustrates the relationship between Gallons Per Minute (GPM) and MBH (Thousands of BTU per Hour) for various temperature drops (10°F, 20°F, 30°F, 40°F).

Table 8: Output-Flow Rate Corrections

Shows MBH which result at specific water temperature drops and minimum water flow rates which are required to maintain turbulent flow within element tubes. Minimum flow rate is 0.25 Ft./Sec.

Convector Depth	Tubes per Element	GPM	MBH Based on T.D. & Min. Flow Rate
			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

Convector Coil Details

Coil construction features 2, 3, or 4 tube elements with copper tubes and aluminum fins, mechanically bonded at 6 fins per inch. Fin height is 2-1/2 inches.

Coil dimensions: 4" depth has 2 tubes (3-3/4" width), 6" depth has 3 tubes (5-3/4" width), 8" depth has 4 tubes (7-3/4" width).

Diagram Description: Illustrates the convector coil with details on tube elements, header connections (3/4" NPT typical), vent plug, and hanger attachment points.

Note: When ordering convectors with end pockets, the overall physical length increases by 4" for each end pocket, while the coil length remains standard.

Manufacturer Information

Sterling Commercial Hydronic Products

260 North Elm St., Westfield, MA 01085

(413) 564-5535

Website: www.sterlingheat.com

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