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®
CoRayVac
Custom Engineered,
Gas-Fired, Low-Intensity
Infrared Heating System
CRV-B-2
CRV-B-9
CRV-B-4
CRV-B-10
CRV-B-6
CRV-B-12
CRV-B-8
CRV-B-12A
Design Manual
®
All designs must be installed in strict accordance with the CORAYVAC
Installation, Operation and Service Manual (P/N 127102NA).
Roberts-Gordon LLC
1250 William Street
P.O. Box 44
Buffalo, New York 14240-0044
Telephone: +1.716.852.4400
Fax: +1.716.852.0854
Toll Free: 800.828.7450
www.robertsgordon.com
www.rg-inc.com
© 2012 Roberts-Gord
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TABLE OF CONTENTS ® ™ SECTION 1: Concept ..............................................................1 SECTION 10: ROBERTS GORDON ULTRAVAC Design SECTION 2: The CRV-Series System.....................................2 Requirements................................................. 31 2.1 Safety...........................................................................2 SECTION 11: CRV-Series Equipment Specifications......... 32 2.2 Zero Regulator..................................................
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TABLE OF FIGURES Figure 1: Assembly Overview (Two Branch System Shown).....3 Figure 2: Standard Reflector .....................................................6 Figure 3: One Side Reflector.....................................................6 Figure 4: Two Side Reflectors ...................................................6 Figure 5: Universal Shield, Position 1 .......................................7 Figure 6: Universal Shield, Position 2 .......................................7 Figure 7: Uni
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SECTION 1: CONCEPT SECTION 1: CONCEPT The concept of CRV-Series is easy to understand. However, it means discarding old ideas because CRV- Series is a different kind of heating system. CRV-Series is a gas-fired, vacuum-operated, low- intensity infrared heating system incorporating a pat- ented incremental burner system. Gas-Fired means it uses clean-burning Natural or Propane gas. Vacuum-Operated means that the pump draws all the products of combustion through the system and expels them ou
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CRV-SERIES DESIGN MANUAL SECTION 2: THE CRV-SERIES SYSTEM A CRV-Series system consists of one pump, a control With CRV-Series, all equipment and controls are system, and a number of burners, see Page 3, Figure C.S.A. design certified, both as individual parts and 1. It also includes an extended tube surface (4" (10 also as a complete heating system. Also, individual cm) steel tubing) covered by highly efficient reflectors electrical component parts are listed as applicable. to direct the radi
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SECTION 2: THE CRV-SERIES SYSTEM FIGURE 1: Assembly Overview (Two Branch System Shown) 3
1. Radiant tubing between burners, and 20-50' (6-15 m) downstream of the last burner is normally hot rolled steel or heat-treated aluminized steel. All tailpipe tubing must be por- celain coated
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CRV-SERIES DESIGN MANUAL 2.3 Fuel Savings and Comfort Space heating can be accomplished with less input capacity when a radiant heating system is utilized, rather than with a conventional convective heating system. Why is this so? A conventional, convective heating system, such as a unit heater or central furnace works by heating the air, which then indirectly heats the area and occupants. CRV-Series utilizes infrared energy to heat objects, people and surfaces directly, not the air. The
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SECTION 3: CLEARANCES TO COMBUSTIBLES SECTION 3: CLEARANCES TO COMBUSTIBLES 3.1 Required Clearances to Combustibles • Hang heater in accordance to the minimum sus- pension requirements. Clearances are the required distances that combusti- ble objects must be away from the heater to prevent • If the radiant tubes must pass through the building serious fire hazards. Combustibles are materials, structure, be sure that adequate sleeving and fire which may catch on fire and include common items
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CRV-SERIES DESIGN MANUAL NOTE: 1. All dimensions are from the surfaces of all tubes, couplings, elbows, tees and crosses. 2. Clearances B, C and D can be reduced by 50% after 25' (7.5 m) of tubing downstream from where the combustion chamber and the tube connect. FIGURE 2: STANDARD REFLECTOR (inches) (centimeters) Model A B CDA BC D CRV-B-2 4 20 48 20 11 51 122 51 # CRV-B-4 4 20 48 20 11 51 122 51 CRV-B-6 4 20 48 20 11 51 122 51 CRV-B-8 4 20 48 20 11 51 122 51 CRV-B-9 4 36 60 36 11 92 153 92
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SECTION 3: CLEARANCES TO COMBUSTIBLES NOTE: 1. All dimensions are from the surfaces of all tubes, couplings, elbows, tees and crosses. 2. Clearances B, C and D can be reduced by 50% after 25' (7.5 m) of tubing downstream from where the combustion chamber and the tube connect. FIGURE 5: UNIVERSAL SHIELD, POSITION 1 (inches) (centimeters) Model A BC DA BC D CRV-B-2 4 12 12 12 11 31 31 31 # CRV-B-4 4 12 12 12 11 31 31 31 CRV-B-6 4 12 12 12 11 31 31 31 CRV-B-8 4 12 12 12 11 31 31 31 CRV-B-9 8 18
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CRV-SERIES DESIGN MANUAL NOTE: 1. All dimensions are from the surfaces of all tubes, couplings, elbows, tees and crosses. 2. Clearances B, C and D can be reduced by 50% after 25' (7.5 m) of tubing downstream from where the combustion chamber and the tube connect. FIGURE 8: 2-FOOT DECO GRILLE (inches) (centimeters) Model A BC DA BC D CRV-B-2 4 12 48 12 11 31 122 31 # CRV-B-4 4 12 48 12 11 31 122 31 CRV-B-6 4 12 48 12 11 31 122 31 CRV-B-8 4 12 48 12 11 31 122 31 CRV-B-9 4 18 56 18 11 46 143 46
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SECTION 4: SIZING AND DESIGN CONSIDERATIONS SECTION 4: SIZING AND DESIGN CONSIDERATIONS The building heat loss must be calculated in accor- heating system. The ability of a radiant system to pro- dance to accepted energy load calculation methods. vide the advantages of these radiant effects rests ASHRAE (American Society of Heating, Refrigeration largely with the ability of this system to establish a and Air-Conditioning Engineers) offers in-depth infor- reserve heat capacity in the floor. W
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CRV-SERIES DESIGN MANUAL EXAMPLE 2: calculated CRV-Series system required installed capacity. Given a building with a calculated heat loss 4.4 Radiant Distribution of 500,000 Btu/h, what is the installed capac- Radiant heat distribution at occupant level must be ity required of a CRV-Series system mounted considered in the burner and design selection at 50' (15 m)? process. ® CORAYVAC Installed Capacity = Heat Loss x Distribution of heat between radiant branches at floor Radiant Adjustme
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SECTION 4: SIZING AND DESIGN CONSIDERATIONS FIGURE 11: Radiant Distribution (Average Coverage) (
' $%& FIGURE 12: Radiant Distribution (Increased Coverage) (
) $%& FIGURE 13: Radiant Distribution (Heavy Coverage) (
*(
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,
,
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CRV-SERIES DESIGN MANUAL SECTION 5: FLOW LOADING The patented CRV-Series burner system allows a burners, the burner inlet flow consists the of the total of number of burners to be installed in-series, in the the end vent air plus the combustion gases from all same radiant tube, resulting in a long, continuous radi- upstream burners. ant emitting surface to give even heat distribution The requirement for minimum burner inlet flow is met if within the building. the total flow units entering th
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SECTION 5: FLOW LOADING FIGURE 14: Burner Flow Units # )%-0%-0%-0% "
"
(7%.
/ -)%.
/ -0%.
/ -0%.
/ -0%.
/
#
!" 0 )%2%%% )
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CRV-SERIES DESIGN MANUAL 5.2 Pump Capacity number of flow units carried in the tube. The flow unit capacity of the pump is indicated on See Figure 15. Readings for length and flow when Page 14, Table 2, as a function of installed altitude. plotted on the graph must fall on OK side to avoid When the CRV-Series system is designed in accor- excessive vacuum losses. dance with this set of instructions and is in proper FIGURE 15: Vacuum Loss Curve for 4" Shared operating condition, a vacuum fro
