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Heater component function – L.B. White AW250 User Manual

Page 15

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Heater Component Function

Air Proving Switch

Safety device used to insure that the proper air flow is being

achieved before the gas valve is opened.

Burner

Cast iron component used to channel gas and provide an

area at which the fuel may ignite.

Burner Orifice

Brass metering device used to feed gas to burner at a

specific rate.

Fan Housing

Chamber used for compressing air for efficient air

movement.

Fan Wheel

Component used in conjunction with the motor and fan

housing to pull the hot air from heater and blow it into room

for heating (also known as a squirrel cage).

Flame Sensor

Also known as a flame rod or flame probe, this device works

in conjunction with the ignition module in proving that

burner flame has been established.

Gas Control Valve

A device which consists of a low pressure regulator and

electrical solenoids which are used for the control of gas

flow to the burner assembly. A feature of the control is a

built in gas shut off which is used to isolate the heater from

its gas supply when servicing.

Gas Hose

Flexible connector used to convey gas from supply line in

building to heater.

Heat Chamber

Metal fire box within the appliance that provides an area

where burner flame mixes with combustion air thereby

providing heat.

High Limit Switch

Safety device wired into the control system which is used to

break an electrical circuit to the gas control valve in event of

overheat situation.

Hot Surface Igniter

Electrical ignition device used on automatic ignition control

systems. Ignites gas by surface temperature rather than by

spark or flame.

Ignition Control Module

Controls the ignition sequence and operation of the heater

as well as monitoring the safety sevices. A major service

feature is the board’s ability to diagnose component and

flame failure by means of a diagnostic light located within

the module. This light will provide a specific flash pattern

repetitively, depending on the type of componenet failure

that has occurred.

Motor

Electric device used to force preheated air through the

heater and to circulate heat within a certain area. Converts

electrical energy into mechanical energy.

Regulator

The heart of any gas supply installation. Used to deliver a

working pressure to the heater under varying conditions in

tank pressure.

Thermostat

Electrical device used as an automatic on/off switch which

will respond to changes in temperature in a certain area.

Can be wired so contacts in the thermostat open or close on

temperature increase or decrease.

Throttle Valve

Manually adjustable component used to increase or

decrease the flow of gas to the burner. The throttle valve is

located between the gas control valve and burner assembly.

Transformer

This device is responsible for reducing a higher incoming

voltage (normally 120 V.A.C.) to a lower outgoing voltage.

The lower voltage (24 V.A.C.) is essential to operate the

ignition control module.

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