Remington HH-70T-KFA Service Manual download pdf (Page 125)

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Gas Fired Heaters

Component Description and Operation

Control Relay

The control relay is a safety feature added to some of the newer forced air propane heaters that use a

thermocouple and a thermoelectric valve. Two of the major propane heater manufactures mentioned in

this manual use control relays. What the control relay’s purpose is to allow the D.C. electric circuit (the

thermocouple, the high limit switch, and the thermoelectric gas valve) and the A.C. electric circuit to

interface with each other. In other words, if the high limit switch opens contacts, then the whole unit

will shut down.

Fan Blades

(Forced Air Heaters Only) The fan blade in the propane forced air heater plays an extremely important role in the operation of the entire

heating system. It has many purposes. First, its job is to pull air in through the back of the unit to cool the internal components. Next,

(and most importantly) the fan blade circulates air around and thru the combustion chamber. Not only is the fan blade responsible for

producing the hot, forced air, but also it is extremely important in determining WHERE the burn takes place in the combustion chamber.

Since a propane forced air heater has no nose cone, the air movement delivered by the fan blade is of extreme importance in determining

where the combustion takes place. All of your safety components in your forced air heater rely on the burn occurring at a particular

place in the combustion chamber for proper monitoring and proving.

Pilot Orifice

(Radiant and Convection Models Only) The pilot orifice is used on radiant and convection heaters that utilize a thermoelectric (push

button) gas valve. There are two main purposes of the pilot orifice. The first (and most important) reason is to heat the thermocouple

for safety monitoring. The second reason is so that every time you want heat, you do not have to go through the ignition process. Since

the pilot orifice requires the least amount of propane, and has the smallest diameter, it is usually the first place to

become restricted or obstructed during normal operation.

Burner Orifice

All propane heaters have a burner orifice. Whether the burner orifice is a single-port (having one gas opening

and a flame deflector) or a multi-port (having six or more smaller openings and may or may not have a

flame deflector), they both serve the same purpose. That purpose is to deliver propane into the area of

combustion in a way to allow for safe, even, and proper combustion. All burner orifices have a certain

outlet size that is determined by the manufacturer and should NEVER be altered.

Motor

The motor in a forced air propane heater has a multitude of functions. One of the motor’s responsibilities is to bring fresh air around

and through the combustion chamber for combustion and equal distribution of heat. The motor also cools down the heater’s internal

components with that same inlet air. By turning the fan blade, the motor has as much to do with where the burn takes place in the

combustion chamber as any other component in the heater.

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Gas Heater Service Info.

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Remington HH-70T-KFA Service Manual Page 125