1. CORAYVAC® Design and Layout

2. Heat Loss Sizing up a CORAYVAC® System Example:
Heat Loss = 350,000 BTU
(.80 CRV Adjustment Factor) 350,000 * .80 = 280,000 BTU
It is well known and recognized by ASHRAE that an adjustment factor of .80 can be applied to a Heat Loss calculation when sizing a CORAYVAC® system.
It takes less BTU to heat a space with infrared heaters because infrared heaters use the objects and floor to build up a heat sink. Once a heat sink is built up, the floor and objects will heat the air. A CRV system will run less than a conventional warm air system because of the built up heat sink.

3. Factors in Burner Selection
Desired Infrared Intensity
Heat gain and distribution
Mounting Height
Required Distance Between Burners
Flow unit restrictions
(Read slide) How much heat you want in a specific area/space. This would
(Read slide) What kind of coverage your customer desires.
(Read slide) Maintain the clearance to combustibles and comply with suspension clearances referenced in the installation manual
(Read slide) The required distance between burners is important. It will determine what the length of your tailpipe will or can be.
(Read slide) There are also flow unit restrictions that must be followed.

4. Model Number Designation
CRV-B Series
Input (BTU/Hr.)
Model Number
20,000 (NG Only)
CRV-B-2
40,000
CRV-B-4
60,000
CRV-B-6
80,000
CRV-B-8
90,000
CRV-B-9
100,000
CRV-B-10
110,000
CRV-B-12A
120,000
CRV-B-12
Read Slide

5. Firing Rates in Regards to Design Parameters
-This chart will help you figure out how much radiant tubing you will need to design your system. (EXPLAIN RADIANT TUBE LENGTHS)
-’Branch’ refers to one length of radiant tube before an elbow or tailpipe.
-Tube length requirements also apply to distance after a burner even if another burner does not follow it.
- Located on pg. 12 of the CRV design manual.

6. Flow Unit: Amount of fuel/air mixture required to produce 10,000 BTU
This chart tells you the amount of flow units you must use for each burner and end vent when you are designing a system.
One Flow Unit is the amount of the mixture of gas and air required to produce 10,000 Btus.
Located on pg. 13 of the CRV design manual.

7. CRV System Identification
Tailpipe
CRV-B4
CRV-B4
Branch #2 Radiant Tubing
Branch #1 Radiant Tubing
Branch – Shown in red, each branch consists of 3 CRV-B4 burners. ’Branch’ refers to one length of radiant tube before an elbow or tailpipe.
Radiant Tubing – Their is a minimum, recommended, and maximum distance between the burners for the radiant section of the system.
Tailpipe – The run of tubing between the last section of radiant pipe and the vacuum pump. Can be heat treated aluminized steel or double coated porcelain.
End Vent – According to the Branch Configuration chart on pg 10, the end plate # to use for each branch shown in this layout is end vent plate # 4.
Flow Units – total flow units when adding both branches together is 64. An EP-100 pump has the capacity to handle this many flow units.
CRV-B4
CRV-B4
Shared
Tailpipe
CRV-B4
CRV-B4
EP-100
Pump
End Vent
End Vent

8. Allowable Tailpipe Lengths
Tail pipe is needed to cool off the flue gases before being exhausted throw the vacuum pump.
Ansi standard requires that flue temperatures be below 480° F.
The more tail pipe you have, the more efficient your system is. Designing a system that condenses is essentially squeezing out as much radiant energy as possible. The more radiant energy you get out of a system, the better off you are.
Located on pg. 17 of the CRV design manual

9. Pump Capacity at Altitude
- Located on pg. 14 of the CRV design manual

10. Vacuum Loss For 4” Shared Tailpipe
It is recommended to keep shard tail pipe under 20’.
However, we understand that certain applications require longer runs of shared tail pipe.
Our standard pipe is 4”. However, 6” pipe is available. You would use 6” pipe if you want to cut down on the length of shared tail pipe. 1’ of 6” pipe is equivalent to 1.3’ of 4” pipe.
Located on pg. 14 of the CRV design manual

11. Recommended Mounting Heights
CORAYVAC® System
Input (BTU/Hr.)
Min. Mounting Height
20,000 8’
40,000
60,000
80,000
10’
90,000
100,000
15’
110,000
120,000
Mounting height will largely be based on ceiling height.
However, these are the suggested minimum mounting heights for a CRV system.

12. Clearances to Combustibles
Have non-stationary items been considered when laying out heaters? See Installation, Operation and Service Manual.
Garage Doors – Do not place heaters above areas occupied by open overhead doors
Vehicle Lifts – Do not place heaters directly above lifts, since clearances diminish as the lift rises
Movable Cranes – Shielding may be required above movable (or even stationary) cranes
Read Slide

13. 300 Watt
110,000BTU
100 Watt
100,000BTU/Hr
One misconception of low-intensity infrared is its ability to heat high bay facilities. Many people believe that infrared is ineffective for high bay areas when in actuality it is very effective in this type of application, in fact more effective than any other type of system available. However, there is a need to adjust inputs to compensate for mounting height relative to the floor.
Similar to a lighting system where you need to increase wattage the higher you go, you need to increase infrared input 1% per foot for each foot over 20 feet ( 3% per meter for each meter over 6 meters ).
Ex: 100,000 btu’s at 20 ft will need to increase to 110,000 btu’s for 30 ft.
That’s 1% (1,000 btu’s) x 10 ft (10,000 btu’s) + 100,000 btu’s = 110,000btu’s
Infrared Input Increased 1% per Foot for Each Foot Over 20 Feet (3% /meter over 6 m)

14. Infrared Distribution: The Width of Infrared Heat Pattern is Twice the Mounting Height
Spacing between the radiant branches will vary depending on the desired temperature in the space. This is largely dependent on your heat loss and what kind of coverage you want in the space.
1st layout is for areas of low heat loss, used in normal warehouse or factory applications, possibly in the middle of the building where occupant traffic is low.
2nd layout shows continuous radiant distribution for heating anywhere there is higher heat loss or occupant traffic.
3rd layout can be used for spot heating above shipping docks or around perimeters.

15. Heater Hanging Points
Have the hanging points been located on adequate structural members?
Are there sufficient hanging points and have they been placed in the proper locations?
Read Slide

16. Tubing 4” O.D. 16-gauge tubing
Available in Hot-rolled steel, aluminized steel, or double porcelain coated steel
CORAYVAC utilizes 4” O.D. 16-gauge tubing.
Tubing for the radiant branches can be hot rolled steel, heat treated aluminized, or double coated porcelain steel, which is a cured porcelain coated on the inside and outside surface of the tubing, helping to maximize longevity and minimize corrosion of condensing systems. HT aluminized has a higher radiant emissivity than HRS (.80) and is more durable. HRS is more economical. Porcelain tube has the highest radiant emissivity of the 3 at .96.
Tubing for the tail pipe part of the system can be double coated porcelain or heat treated aluminized. HRS is not approved for to be used for tail pipe because condensation will form and can have negative effects on the HRS tubing.
Systems can also be designed using schedule 40 black steel pipe. These systems are referred to as the CORAYVAC® Classic system, because the original CORAYVAC systems were designed with schedule 40 pipe. The CORAYVAC Classic system is extremely robust and is the most efficient CORAYVAC system you can design because of the high radiant emissivity of schedule 40 pipe and cast iron combustion chambers (which is .95 for each), the pipe holds the heat longer than standard systems so the burners will not need to be on as often, and all components are threaded providing a completely sealed system. 16

17. Couplings Join heat exchanger pipe together
Couplings are used to join the heat exchanger pipe together.
Standard couplings are SS, we also offer lined couplings (lined couplings provide a better seal and is recommended for use with tail pipe), and damper couplings which are used for systems with uneven branches and help maintain consistent vacuum pressures for each radiant branch.
Join heat exchanger pipe together
We offer stainless steel couplings, lined couplings, and damper couplings 17

18. Mixing Burners CRV-B6 CRV-B6 CRV-B6 CRV-B8 CRV-B10 CRV-B10 EP-100 Pump
Branch – Shown in red, each branch consists of 3 CRV-B4 burners. This would be similar to using approved branch configuration # 1 which shows 4 – CRVSF-4 burners.
Radiant Tubing – Their is a minimum, recommended, and maximum distance between the burners for the radiant section of the system.
Tailpipe – Can be heat treated aluminized steel or double coated porcelain.
End Vent – According to the Branch Configuration chart on pg 10, the end plate # to use for each branch shown in this layout is end vent plate # 4.
Flow Units – total flow units when adding both branches together is 64. An EP-100 pump has the capacity to handle this many flow units.
CRV-B6
CRV-B8
CRV-B10
CRV-B10
EP-100
Pump
End Vent
End Vent

19. Uneven Branches CRV-B4 CRV-B4 CRV-B4 End Vent CRV-B4 Damper Coupling
The damper coupling should be installed on the part of the system with the shortest amount of total tubing.
The vacuum pressure of the pump should be set to the part of the system with the longest amount of total tubing.
Vacuum pressure on the shorter section will be set via the damper coupling.
CRV-B4
Damper
Coupling
CRV-B4
EP-100
Pump
End Vent

20. Sample Drawings
This is a complete drawing with a legend, and a schedule.
This is an affective way of getting RG equipment specified.

21. Sample Drawings
This is a complete drawing with a legend, and a schedule.
This is an affective way of getting RG equipment specified.

22. Thank You!
Questions?