Heater Component Function. LB White L.B. White Therma Grow Greenhouse Heaters HW120

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.

Hot Surface Igniter

Ignition device used on automatic ignition control systems.

Ignites gas by surface temperature rather than spark or flame.

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.

Ignition Control Module

Electronic printed circuit board which sends and receives voltages to various controls in an automatic ignition system.

An important safety feature of the control board is that it will shut down the entire heater, thereby stopping the flow of fuel gas if burner flame goes out.

Fan Housing

Chamber used for delivering air for efficient air movement.

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.

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).

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.

Regulator

Mechanical device used in L.P. and natural gas distribution systems to reduce a higher inlet pressure to a preset lower pressure. The regulator is responsible to supply a steady outlet pressure to the heater(s) despite changes in inlet pressure, heater demand and weather conditions.

Thermostat (Accessory)

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.

Transformer

Electrical control used to accept line power supply primary voltage and reduce it to lower secondary voltage to operate certain control systems.

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.

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Parts Identification

PARTS SCHEMATIC

27

28

28

22

26

29

35

36

37

5

23

21

24

20

18

17

19

16

15

6

7

8

9

10

26

13

12

25

11

4

3

14

2

30

34

31

32 33

1