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Basic operation, Fans, Enable – L.B. White AW250(Smart Box controller) User Manual

Page 5: 115 vac incoming power, Fig. 1

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Basic Operation

FANS

ENVIRONMENT
CONTROLLER

L.B. WHITE

Smart Box

ENABLE

CONTROL SIGNAL
TO GAS VALVE

115 VAC TO HEATER

115 VAC
INCOMING
POWER

SmartBox

SENSORS

EXISTING ROOM
SENSORS

GUARDIAN

HEATER(S) WITH

Smart Sense

GUARDIAN WITH

Smart Sense

This heater uses Smart Sense

technology for variable

rate heat control. When integrated to a building controller
and L.B.White SmartBox

,

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 where it needs to. 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 an
L . B . W h i t e SmartBoxa n d b u i l d i n g e n v i r o n m e n t
controller is required for further operation. See Fig.1 for
a typical system diagram.

Each SmartBox

controls two zones of heat, two heaters

per zone .

One sensor may be used for each zone of heat, however
two sensors are normally used for optimum temperature
management..

Sequence of Operation

a. 115 VAC is supplied to SmartBox.
b. Call for heat occurs from building controller.
c. Building controller closes heating contacts, and

energizes the SmartBox.

d. SmartBoxsends 115 VAC to heater and

simultaneously sends anywhere from 1-15 VDC to

Smart Sense variable rate gas control valve.

-- Variable rate valve opens at specific firing rate

to meet temperature demands

e. Ignition of gas occurs.

-- Room warms to desired temperature.

f. Building controller recognizes desired temperature has

been achieved.

g. Building controller disconnects signal from the

SmartBox.

h. Heater shuts down. Process begins again on a call for

heat.

FIG. 1

5

SmartBox

SENSORS

SmartBox

SENSORS ARE LOCATED WITHIN 6 IN. OF EXISTING ROOM SENSORS, AND AT THE SAME HEIGHT.