L.B. White Guardian with Smart Sense / Direct Connect - Spark Ignition (250K) - Manual (Page 6)

5
Basic Operation
This heater uses Smart Sense
™
technology for variable
rate heat control. L.B.White has worked with agricultural
building control manufacturers for the proper
implementation of the Smart Sense
™
variable rate heating
control logic. If you have questions on whether or not your
control incorporates the Smart Sense
™
control logic, call
L.B.White Co.
When integrated to a building controller , precise, automated
control of the environment is achieved by operating the
heater over a broad heat range from 65,000 btu to 250,000
btu. This provides better, more even temperature distribution
by allowing the heater to operate at the output necessary to
maintain temperature. This results in consistent
temperatures and reduced fuel consumption.
As shipped from the factory, the heater is wired to start
and operate at minimum heat. Connection to a building
controller capable of providing 0-10 VDC, 0-20 milliamp,
or 4-20 milliamp signal for the heater’s Smart Sense™gas
control valve is required for further operation. See Fig. 1
for a typical system diagram.
Sequence of Operation
a . Building controller determines that heat is required.
b. Building controller closes the heating contact,
providing power and the control signal to the Smart
Sense
™ heater.
c. The Smart Sense
™ heater starts at the minimum
operation position.
d. The Smart Sense
™ control logic incorporated in the
building controller then manages the output of the
Smart Sense
™ heater as necessary to achieve and
maintain the desired room temperature.
Note: When properly set up, the Smart Sense
™ variable
rate heater will run for long periods of time - much
longer than typically experienced with on/off
heating. This is normal and is key to achieving the
consistent air temperatures and fuel savings
associated with
Smart Sense
™ variable rate
heating.
e. If the building controller determines that heat is no
longer required, it will shut the heater off and then
will initiate the heating sequence again when heat is
required.
FANS
BUILDING CONTROLLER
0-10 VDC, 0-20 mA, or 4-20 mA
CONTROL SIGNAL TO GAS VALVE
115 VAC TO HEATER
GUARDIAN
HEATER(S) WITH
Smart Sense
™
FIG. 1
GUARDIAN WITH Smart Sense
™
ROOM SENSORS