Beacon Morris Convectors

Product Overview

Beacon Morris Convectors are engineered for both forced hot water and two-pipe steam heating system installation, featuring lightweight non-ferrous construction heating elements. They are available in seven basic types suitable for a wide range of applications in institutional buildings, hospitals, hotels, office buildings, schools, and apartments. Various cabinet enclosure styles are offered to blend with any building interior, from modern to traditional. Convectors are designed for maximum installation flexibility, available in free-standing, semi-recessed, wall-hung, and fully recessed models. Enclosures are formed from heavy-gauge steel with a durable baked powder prime finish.

Features and Components

Types of Convectors

Beacon Morris offers several convector types, including:

• FS-A/FSG-A (Free-Standing): Designed for exposed installation flush against the wall. Suitable for system modernization. Open inlet (FS-A) or louvered inlet (FSG-A).
• W-A (Wall Hung Flat-Top): Fully exposed wall-hung unit with a flat top and louvered outlet. Air inlet through the open bottom.
• SW-A (Wall Hung Slope-Top): Fully exposed wall-hung unit with louvers in a sloping top (30° slope). Air inlet through the open bottom.
• SR-A/SRG-A (Semi-Recessed): Cabinet projects 2 1/4" from the wall. Fastens to brackets in a wall recess. Open inlet (SR-A) or louvered inlet (SRG-A).
• PW-A/PWG-A (Partially Recessed): Cabinet extends 2 1/4" from the wall with a rounded flange front. Air inlet through the open bottom (PW-A) or louvered inlet (PWG-A).
• SF-A/SFG-A (Free-Standing Slope-Top): Similar to FS-A but with a slope top.
• RF-A/RFG-A & FWG-A (Fully Recessed): Designed to be fully recessed within the wall. Fronts are fastened by screws and are removable for access. RF-A has an open inlet; RFG-A and FWG-A have louvered inlets. FWG-A is for wall mounting.

Specifications and Ratings

Detailed steam and hot water ratings are provided in the tables below. These tables list capacities based on convector depth, length, and specific model types (e.g., FS-A, W-A, SR-A, PW-A, SF-A, SW-A, RF-A, FWG-A).

Table 1: Convector Steam Ratings (BTU/H) - Type FS-A / FSG-A

Table 2: Convector Steam Ratings (BTU/H) - Wall Mounted Types

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

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

*Apply factor to Tables 1, 1A, 2 and 2A (pages 6 & 7) to obtain rating at other than 1 psi gauge.

Note: Max Recommended operating pressure 150 PSIG, (365.9°F).

For conversion from steam to hot water, use table factors as multiplier rather than a divisor.

Table 5: Correction Factors for Access Doors

Table 6: Pressure Loss in Feet of Water

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.

Table 7: Gallons Per Minute of Hot Water Required (Chart)

[Diagram: GPM vs. MBH chart for various temperature drops]

The chart above may be used to determine the approximate GPM required for the desired MBH with various water temperature drops. Formulas shown in the chart with temperature drops may also be used for determining GPM.

Example: MBH = 15, Temperature drop = 10°F, Factor = .200. Calculation: 15 x .200 = 3.0 GPM.

Where systems are designed for low flow rates (velocity), it has been determined by ASHRAE and the Hydronics Institute (I.B.R.) that a minimum flow rate of .25 F.P.S. should be observed. No formal test information is available for performance below the .25 F.P.S. at this point in time.

REF: BTU = GPM x 500 x TD; GPM = (BTU ÷ 500) ÷ TD; TD = (BTU ÷ 500) ÷ GPM

Table 8: Output-Flow Rate Corrections

Note: Table 8 shows MBH which result at specific water temperature drops and minimum water flow rates which are required to maintain turbulent flow within element tubes. If the MBH output rating capacities shown on pages 6 to 13 fall below those shown in Table 8 for minimum flow rates, this indicates that the GPM required at a 20°F Water Temperature drop is less than the minimum GPM required to maintain turbulent flow.

Example: From page 12, 20°F water temperature drop, 170°F AWT, 65°F EAT. Unit FSA-18, 8" deep, 20" long. BTU = 2335.

This capacity rating is less than the MBH (3.000) shown in Table 8 for a 20°F TD and the minimum flow rate of .30 GPM. Applying the following formula to the example above, we may determine the GPM required for a 20°F TD at 2335 BTU:

GPM = (2335 BTU) / (500 x 20TD) = 0.23 GPM

Again, this GPM is too low to maintain turbulent flow within the element tubes. Therefore, use Min. GPM of .30 per Table 8. The water temperature drop which may be expected when using the Min. GPM can be determined using the following formula:

TD = (2335 BTU) / (500 x .30) = 15.6°F

Note: By using the higher flow rate, a lower water temperature drop will be experienced. Because of this, the average water temperature will be higher and result in a somewhat higher output capacity. For many installations, the use of the minimum GPM from Table 8 will be satisfactory, without further consideration. However, if required, a closer approximation may be obtained by dividing by two and subtracting the result from the entering water temperature of 180°F.

i.e. 180 - (15.6 / 2) = 172.2°F AWT

Then, the new MBH rating may be determined by interpolation between the ratings shown on page 12 for the unit at 170°F AWT and 180°F AWT. In the above example, the new rating would be 2415 BTU which would be very close to the actual performance without resorting to further iterations.

Corrections When Using Glycol Solution in System

*Compared To Water.

Convector Design/Installation Data

Detailed design and installation data, including dimensions and model specifications, are provided for various convector types.

Type FS-A / FSG-A

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

[Diagram: Side and front view of FS-A/FSG-A convector with dimensions L, D, H, B, J labeled. FS-A = OPEN INLET, FSG-A = LOUVERED INLET]

Type W-A

* 7-1/2" For 14" High Units

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

[Diagram: Side and front view of W-A convector with dimensions L, D, H, B, J labeled.]

Type SW-A

* 7-1/2" For 14" High Units

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

[Diagram: Side and front view of SW-A convector with dimensions L, D, H, B, J labeled.]

Type SR-A / SRG-A

NOTE: Order by Liner Dimensions -- L x H. When adding end pockets, liner and front length increase.

[Diagram: Side and front view of SR-A/SRG-A convector with dimensions L, D, H, B, J labeled. SR-A = OPEN INLET, SRG-A = LOUVERED INLET]

Type PW-A / PWG-A

NOTE: Order by Liner Dimensions -- L x H. When adding end pockets, liner and front length increase.

[Diagram: Side and front view of PW-A/PWG-A convector with dimensions L, D, H, B, J labeled. PW-A = BOTTOM INLET, PWG-A = LOUVERED INLET]

Type SF-A / SFG-A

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

[Diagram: Side and front view of SF-A/SFG-A convector with dimensions L, D, H, B, J labeled. SF-A = OPEN INLET, SFG-A = LOUVERED INLET]

Type RF-A / RFG-A

NOTE: Order by Liner Dimensions -- L x H. When adding end pockets, liner and front length increase.

[Diagram: Side and front view of RF-A/RFG-A convector with dimensions L, D, H, B, J labeled. RF-A = OPEN INLET, RFG-A = LOUVERED INLET]

Type FWG-A

NOTE: Order by Liner Dimensions -- L x H. When adding end pockets, liner and front length increase.

[Diagram: Side and front view of FWG-A convector with dimensions L, D, H, B, J labeled. FWG-A = LOUVERED INLET]

Heating Element Details

Heating elements are non-ferrous, consisting of 3/8" diameter copper tubes with .010" thick aluminum fins. Fins are mechanically bonded to copper tubes at 6 fins per inch. Cast bronze headers connect the tubes. One header has a 1/4" NPT tapping for venting; the other has a 1/4" NPT galvanized plug. Elements are tested at 100 P.S.I. air pressure under water. Standard elements have two single 3/4" NPT headers. An optional dual inlet header is available for top or bottom piping connections.

[Diagram: Heating element showing tube, fin, header, and dual inlet header options.]

System Connections

Hot Water System

[Diagram: Hot Water System piping schematic showing supply pipe, vent plug, return pipe, and connection to convector.]

Steam System (Not recommended for one pipe steam)

[Diagram: Steam System piping schematic showing supply pipe, inlet valve, vent plug, vertical trap, return pipe, and connection to convector.]

Convector Specifications

This section details the construction and materials for various convector types.

Cabinet Construction

Cabinets are formed from cold rolled steel, braced and reinforced for stiffness. Fronts are flanged top and bottom with a 3/8" inside radius on the top edge. Air outlet louvers are venetian type. Heating element support brackets are spot welded to cabinet ends. All cabinets are cleaned and finished with a high-quality baked powder prime finish.

Cabinet Styles

• Wall Mounted to Floor (FS-A & FSG-A): 18-gauge CRS fronts/tops, 20-gauge CRS back/sides. Front wraps around sides and fastens with concealed friction-fit fasteners. Venetian type air outlet louvers in top face. Air inlet in lower section (FS-A) or venetian louvers (FSG-A).
• Wall Hung Flat-Top (W-A): 18-gauge CRS fronts/tops, 20-gauge CRS back/sides. Front wraps around sides and fastens with concealed friction-fit fasteners. Venetian type air outlet louvers at top. Air inlet through open bottom. Back panel has stiffener for wall mounting.
• Wall Hung Slope-Top (SW-A): 18-gauge CRS front/top, 20-gauge CRS back/sides. Front wraps around sides and fastens with concealed friction-fit slip joints. Venetian type air outlet louvers in slope top. Air inlet through open bottom. Back panel has holes for wall mounting.
• Wall Mounted to Floor Slope-Top (SF-A & SFG-A): 18-gauge CRS front/top, 20-gauge CRS back/sides. Front wraps around sides and fastens with concealed friction-fit fasteners. Venetian type air outlet louvers in slope top. Air inlet through bottom front panel (SF-A) or venetian louvers (SFG-A).
• Partially Recessed (SR-A & SRG-A, PW-A & PWG-A): 18-gauge CRS wrap-around fronts, 20-gauge galvanealed recessed liner. Cabinet front depth from wall is 2 1/4". Front has radiused edges and extends back to wall, fastening to liner brackets. Venetian type air outlet grille. SR-A has open air inlet; SRG-A & PWG-A have integral inlet air grilles. Models are 3-side overlap (floor mount) or 4-side overlap (wall mount).
• Fully Recessed (RF-A & RFG-A & FWG-A): 18-gauge CRS fronts, 20-gauge galvanealed liner. Fronts engage horizontal securing strip and locking screws. Venetian type air outlet louvers and integral inlet louvers (open for RF-A). 3-side overlap for floor mount (RF-A, RFG-A); 4-sided for wall mount (FWG-A).

Heavy Gauge Options

All enclosure styles are available with heavy gauge CRS:

• Fronts: 18-gauge standard; 16-gauge, 14-gauge optional.
• Liners: 20-gauge standard; 18-gauge, 16-gauge, 14-gauge optional.

*When heavy gauge liners are selected for partially recessed and fully recessed units, the liners are supplied in painted CRS.

Optional Equipment

• Damper with Knob Operator: Factory installed, fast-action, triple lead screw, knob operated.
• Access Door: Hinged on top, secured by concealed 1/4 turn hex-head operator. Provided only when specifically ordered.
• Knock-outs on sides of cabinet: Optional, provided only when specifically ordered.
• Special Design Features: Integral inlet grilles, insulation, special gauge thickness, special fasteners, and other institutional features are available upon request.

Unit Size Selection

To select the correct convector size:

1. Determine system conditions (e.g., hot water temperature, temperature drop).
2. Determine the required MBH capacity based on heat loss calculations.
3. Refer to hot water capacity tables (pages 8-12) for job conditions and model type.
4. Locate the required capacity and read the convector size (Depth, Length, Height) from the table.
5. For temperatures not listed, use correction factors from Table 3 and multiply by the 215°F rating.

Example (Hot Water): Required: SW-A convector, 14.0 MBH capacity, 190°F average water temperature, 20°F temperature drop. Consult page 10, find the table for 190°F AWT, locate a rating of 14.0 or greater. Depth and length are found on the left edge, height at the top of the rating column.

Example (Steam): Required: FS-A convector, 40.5 EDR at 215°F steam. Select size 6-40-24 from Table 1 (page 6), which provides 40.9 EDR. If requirements are in BTU/hr, divide by 240 to get EDR capacity.