Product Features and Specifications
This document outlines the specifications for the Vulcan PW-A and PWG-A convector units, designed for flat top cabinet applications, available in semi-recessed configurations with a 4-sided overlap.
Available Models and Options
Inlet Options:
- PW-A Bottom Inlet
- PWG-A Louvered Inlet
Construction and Materials
Front and Liner:
- Style: Front Outlet
- Outlet: Stamped Louvers, Pencil Proof
- Lengths: Available in 20" through 64" in 4" increments.
- Cabinet Front and Liner Materials: Standard construction uses 18 Ga./20 Ga. CRS (Cold Rolled Steel). Optional materials include various gauges of CRS (18 Ga./18 Ga., 16 Ga./20 Ga., 16 Ga./18 Ga., 16 Ga./16 Ga., 14 Ga./20 Ga., 14 Ga./18 Ga., 14 Ga./16 Ga., 14 Ga./14 Ga.).
- Liner Material Note: The liner is Galvannealed Steel.
- Finish: Standard finish is Baked Powder Prime. Baked Powder Color is available as an option. Stainless Steel (SS) options are available for 18 Ga./20 Ga., 18 Ga./18 Ga., 16 Ga./20 Ga., 16 Ga./18 Ga., and 16 Ga./16 Ga.
Coil and Connections
Element/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. Options include Knob Damper (Optional) and Tamper Resistant (Optional).
- Access Doors (Optional)
- Insulation: Options include Back Only (Optional) or Back, Sides, Top (Optional).
- Piping Knockout (Optional)
- 4" End Pockets: Available for Left Hand (LH) (Optional), Right Hand (RH) (Optional), or Both Ends (Optional).
- Perforated Front: Consult Factory for availability in 16 Ga. (Optional) or 14 Ga. (Optional).
Note: When adding end pockets, the liner and front length increase. The overall physical length will increase by 4" for each end pocket, while the coil length remains the standard size.
Model Dimensions and Ratings
Type PW-A / PWG-A Model Dimensions
The following table details the dimensions (D, L, H, B, J) for various PW-A/PWG-A models.
| MODEL | D | L | H | B | J |
|---|---|---|---|---|---|
| 4xx-18 | 18" | 20,24,28, 32,36,40, 44,48,52, 56,60,64, | 24" | 2-1/8" | 2" |
| 4xx-20 | 20" | 26" | |||
| 4xx-24 | 4-1/4" | 28" | |||
| 4xx-26 | |||||
| 4xx-28 | |||||
| 6xx-18 | 18" | 20,24,28, 32,36,40, 44,48,52, 56,60,64, | 24" | 3-1/8" | 4" |
| 6xx-20 | 20" | 26" | |||
| 6xx-24 | 6-1/4" | 28" | |||
| 6xx-26 | |||||
| 6xx-28 | |||||
| 8xx-18 | 18" | 20,24,28, 32,36,40, 44,48,52, 56,60,64, | 24" | 4-1/8" | 6" |
| 8xx-20 | 20" | 26" | |||
| 8xx-24 | 8-1/4" | 28" | |||
| 8xx-26 | |||||
| 8xx-28 |
Steam Ratings (BTU/H)
The following tables provide steam ratings in BTU/H for units operating at 215°F entering water and 65°F entering air (EAT).
Type PW-A Ratings
| DEPTH INCHES |
FRONT OUTLET, NOMINAL LINER HEIGHT *TYPE PW-A | ||||
|---|---|---|---|---|---|
| 18" | 20" | 24" | 26" | 28" | |
| 20 | 2230 | 2495 | 2830 | 2930 | 3120 |
| 24 | 2760 | 3145 | 3625 | 3720 | 3985 |
| 28 | 3310 | 3815 | 4345 | 4465 | 4775 |
| 32 | 3865 | 4490 | 5110 | 5255 | 5665 |
| 36 | 4370 | 5160 | 5880 | 6025 | 6505 |
| 40 | 4895 | 5810 | 6600 | 6790 | 7320 |
| 44 | 5425 | 6480 | 7390 | 7560 | 8160 |
| 48 | 5950 | 7105 | 8110 | 8350 | 8975 |
| 52 | 6550 | 7800 | 8855 | 9070 | 9745 |
| 56 | 7030 | 8450 | 9625 | 9865 | 10630 |
| 60 | 7655 | 9120 | 10345 | 10610 | 11400 |
| 64 | 8135 | 9790 | 11135 | 11400 | 12290 |
| 20 | 3240 | 3625 | 4250 | 4390 | 4850 |
| 24 | 4030 | 4560 | 5375 | 5570 | 6170 |
| 28 | 4850 | 5520 | 6480 | 6670 | 7370 |
| 32 | 5615 | 6480 | 7610 | 7870 | 8690 |
| 36 | 6430 | 7390 | 8690 | 9025 | 9935 |
| 40 | 7250 | 8375 | 9815 | 10200 | 11230 |
| 44 | 8065 | 9290 | 10920 | 11350 | 12480 |
| 48 | 8880 | 10250 | 12025 | 12455 | 13705 |
| 52 | 9745 | 11185 | 13105 | 13535 | 14905 |
| 56 | 10510 | 12145 | 14230 | 14735 | 16225 |
| 60 | 11400 | 13055 | 15310 | 15840 | 17425 |
| 64 | 12190 | 14040 | 16440 | 17065 | 18770 |
| 20 | 4030 | 4535 | 5040 | 5135 | 5570 |
| 24 | 5110 | 5760 | 6360 | 6575 | 7105 |
| 28 | 6385 | 6960 | 7680 | 7895 | 8520 |
| 32 | 7560 | 8185 | 9025 | 9310 | 10055 |
| 36 | 8710 | 9385 | 10390 | 10705 | 11545 |
| 40 | 9865 | 10630 | 11760 | 12070 | 13055 |
| 44 | 11040 | 11830 | 13055 | 13440 | 14545 |
| 48 | 11950 | 12935 | 14400 | 14810 | 16080 |
| 52 | 13465 | 14230 | 15670 | 16105 | 17425 |
| 56 | 14615 | 15505 | 17090 | 17570 | 19010 |
| 60 | 15770 | 16655 | 18335 | 18840 | 20375 |
| 64 | 16775 | 17880 | 19750 | 20330 | 21960 |
Type PWG-A Ratings
| DEPTH INCHES |
FRONT OUTLET, NOMINAL LINER HEIGHT *TYPE PWG-A | ||||
|---|---|---|---|---|---|
| 18" | 20" | 24" | 26" | 28" | |
| 20 | 2163 | 2420 | 2773 | 2871 | 3089 |
| 24 | 2677 | 3051 | 3553 | 3646 | 3945 |
| 28 | 3211 | 3701 | 4258 | 4376 | 4727 |
| 32 | 3749 | 4355 | 5008 | 5150 | 5608 |
| 36 | 4239 | 5005 | 5762 | 5905 | 6440 |
| 40 | 4748 | 5636 | 6468 | 6654 | 7247 |
| 44 | 5262 | 6286 | 7242 | 7409 | 8078 |
| 48 | 5772 | 6892 | 7948 | 8183 | 8885 |
| 52 | 6354 | 7566 | 8678 | 8889 | 9648 |
| 56 | 6819 | 8197 | 9433 | 9668 | 10524 |
| 60 | 7425 | 8846 | 10138 | 10398 | 11286 |
| 64 | 7891 | 9496 | 10912 | 11172 | 12167 |
| 20 | 3046 | 3408 | 4038 | 4171 | 4753 |
| 24 | 3788 | 4286 | 5106 | 5292 | 6047 |
| 28 | 4559 | 5189 | 6156 | 6337 | 7223 |
| 32 | 5278 | 6091 | 7230 | 7477 | 8516 |
| 36 | 6044 | 6947 | 8256 | 8574 | 9736 |
| 40 | 6815 | 7873 | 9324 | 9690 | 11005 |
| 44 | 7581 | 8733 | 10374 | 10783 | 12230 |
| 48 | 8347 | 9635 | 11424 | 11832 | 13431 |
| 52 | 9160 | 10514 | 12450 | 12858 | 14607 |
| 56 | 9879 | 11416 | 13519 | 13998 | 15901 |
| 60 | 10716 | 12272 | 14545 | 15048 | 17077 |
| 64 | 11459 | 13198 | 15618 | 16212 | 18395 |
| 20 | 3667 | 4127 | 4687 | 4776 | 5403 |
| 24 | 4650 | 5242 | 5915 | 6115 | 6892 |
| 28 | 5810 | 6334 | 7142 | 7342 | 8264 |
| 32 | 6880 | 7448 | 8393 | 8658 | 9753 |
| 36 | 7926 | 8540 | 9663 | 9956 | 11199 |
| 40 | 8977 | 9673 | 10937 | 11225 | 12663 |
| 44 | 10046 | 10765 | 12141 | 12499 | 14109 |
| 48 | 10875 | 11771 | 13392 | 13773 | 15598 |
| 52 | 12253 | 12949 | 14573 | 14978 | 16902 |
| 56 | 13300 | 14110 | 15894 | 16340 | 18440 |
| 60 | 14351 | 15156 | 17052 | 17521 | 19764 |
| 64 | 15265 | 16271 | 18368 | 18907 | 21301 |
Correction Factors and Performance Data
Convector BTU Correction Factors (Table 3)
Correction factors based on ASHRAE HVAC Systems and Equipment, Section 35.4, for varying Average Water Temperatures and Entering Air Temperatures (Standard conditions).
| 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 |
Correction Factors for Steam Pressures (Table 4)
Correction factors for steam pressures other than 1 PSI Gauge. Maximum recommended operating pressure is 150 PSIG (365.9°F).
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
Note: Apply factors shown above to the ratings shown on the 215°F ratings page. For conversion from steam to hot water, use correction factors shown in Table 3.
Note: Maximum Recommended operating pressure 150 PSIG, (365.9°F).
Correction Factors for Access Doors (Table 5)
Correction factors for units with access doors, categorized by door location and unit configuration.
| Length | Free Standing, Non-Recessed Non-Standard Access Door Locations | Semi-Recessed or Fully Recessed Non-Standard Access Door Locations | ||||||
|---|---|---|---|---|---|---|---|---|
| 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.
Pressure Loss (Table 6)
Pressure loss in feet of water for convector units with forced hot water, based on 64" length units but applicable to shorter units as most loss is due to headers.
| WATER FLOW IN GPM | 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 |
Charted figures showing 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-Flow Rate Corrections (Table 7 & 8)
Table 7: Gallons Per Minute of Hot Water Required
This chart illustrates the relationship between Gallons Per Minute (GPM) and thousands of BTU per hour (MBH) for different temperature drops.
Table 8: Output-Flow Rate Corrections
This table shows MBH which result at specific water temperature drops and minimum water flow rates required to maintain turbulent flow within element tubes.
| Convector Depth | Tubes per Element | GPM (Min. Flow Rate 0.25 Ft./Sec.) | 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 |
Component Details
Convector Coil Diagram
The convector coil is constructed with a Bronze Header and 3/4" NPT connections. It features Copper Tube elements with Aluminum Fins, mechanically expanded. The coil is available in different configurations:
- 4" Depth: 2 TUBE ELEMENT (3 3/4" width)
- 6" Depth: 3 TUBE ELEMENT (5 3/4" width)
- 8" Depth: 4 TUBE ELEMENT (7 3/4" width)
The end-to-end length of the coil is the liner length minus 1/2 inch. Riser centers are the liner length minus 2 1/2 inches.
Coil fins are 2-1/2 inches high and are bonded to the copper tube at 6 fins per inch.
A Vent Plug is typically located on the coil assembly, and a 3-position hanger is welded to the liner for mounting.
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.
