Roberts Gorden CRV-B-4 User Manual
Page 7
SECTION 1: C
ONCEPT
1
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 or 482.2° C) and radiate
heat at lower intensity per square foot of radiating sur-
face. Area coverage is provided by long runs of 4" (10
cm) O.D. tubing which hang from the ceiling or roof
supports. 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 sys-
tem 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 provided
by the CRV-Series system.