Service manual

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 outdoors.

Low-Intensity means the radiant surfaces of the

tubes do not glow red; instead they operate at a

lower temperature (less than 900°F) and radiate heat

at lower intensity per square foot of radiating surface.

Area coverage is provided by long runs of 4" (10 cm)

O.D. tubing which hang from the ceiling or roof sup-

ports. Reflectors direct the radiant heat downward to

occupied areas.

Radiant refers to the heat radiated by the CRV-

Series system. Because this heat is in the form of

infrared rays, it does not directly heat the air. Instead,

the rays heat objects such as floors, people, walls,

cars, machines, tools, etc. The warm objects, in turn,

heat the air through convection.

Incremental Burner System means that several

burners can operate in-series and fire into the same

run of steel tube that carries the combustion gases

from upstream burners. Each of these burners in a

radiant branch may have different firing rates; also,

the space between burners may vary. This allows the

designer to match heat gain to heat loss for each

area of the building. Firing burners in-series provides

higher thermal and radiant efficiency.

In a properly designed low-intensity radiant system,

the occupants should be barely aware of the radiant

heat when the system is firing. They will feel little or

no change when the thermostat is satisfied and the

system is not firing. This combines with warm floors,

warm walls and draft-free operation to improve the

mean radiant temperature of the space. This is the

key to the exceptional comfort and fuel efficiency pro-

vided by the CRV-Series system.