Remington HH-70T-KFA Service Manual download pdf (Page 124)

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Gas Fired Heaters

Component Description and Operation

Spark Igniter

Spark igniters are small, self-contained controls whose sole purpose is to provide secondary voltage

to the spark plug/electrode. You can look at spark igniters as the spark generators. These controls

are found on propane forced air heaters that use thermoelectric gas valves but do not have push

button (Piezo) ignition. If the unit has a thermoelectric gas valve, then the heater will automatically

have a thermocouple. Spark igniters are continuous ignition, generating a constant spark at up to

25,000 volts. If the heater has a spark igniter and a thermoelectric gas valve, then the heater cannot

use a thermostat. There are two different spark igniters being used in the industry today. The first

one is the Eaton spark igniter, and the second one is the Hi-LO 801. Both of these igniters have no user

serviceable parts.

Eaton Spark Igniter - Both Desa (Master, Reddy, Remington, etc) and Scheu Products (National

Riverside, All Pro, and Universal) use the Eaton spark igniter. They are blue in color and have four

wire connections consisting of an ignition lead, a hot wire, a common wire, and a ground wire. The

Eaton is an enclosed spark igniter with only the 1/4” electrical connections exposed.

Hi-Lo 801 spark igniter is used by Scheu Products exclusively. The Hi-Lo 801 is an open spark

igniter with the resistors and diodes visible. The Hi-LO 801 is also a four-wire spark igniter. The Hi-

LO 801 has one exception to the application rule listed earlier. The exception is that the HI-LO 801

was actually used on National Riverside forced air heaters made from 1978 to 1991 that could use a

thermostat. At different times during that period those heater model numbers included the 80FA,

the 150FA, and the 3500FA.

Piezo Igniter - The Piezo igniter is what is commonly referred to as the “push button” igniter. Piezo igniters are

found on both Desa and Scheu heaters. The Piezo is also found on all three types of propane heaters: radiant, convection, and forced air

models. The Piezo igniter generates a spark when an internal spring-mounted piece of metal is pushed across a crystal when the “push

button” is depressed. There are no user serviceable parts inside a Piezo igniter. There is one rule of thumb when it comes to Piezo

igniters; if the heater has a Piezo igniter, then it also has a thermoelectric gas valve, a thermocouple. If a heater has these components, it

cannot use a thermostat.

Flame Rods/Sensors

Flame rods and flame sensors are parts that work to prove the existence of flame. Although they both try to prove the

existence of flame, flame rods and flame sensors go about accomplishing this in different ways. It is important

to note that there are no user serviceable parts on either of these parts.

Flame Rod - The flame rod is a metal probe that protrudes into the area of combustion. The

flame rod conducts the current from the ions that are naturally occurring. Ions are the static electricity that is in the air. The

explosions from the combustion process straighten out the ions and the burner becomes negatively charged, and the flame rod becomes

positively charged. It delivers the charge to the control board to prove the existence of combustion. Because flame rods vary by

manufacturer, it is important to use the factory authorized replacement only. In addition, flame rods usually have only one wiring post.

Flame Sensors - Like the flame rod, the flame switch is also a probe that protrudes into

the combustion chamber. However, that is where the similarity ends. The flame switch is

not usually all metal, for there is a sensing element located inside of the metal probe. The

flame switch is a normally electronically open, but when the unit is exposed to heat, the

sensing element expands to close the circuit. Unlike the flame rod, the flame switch has

two wiring posts attached to them. Since flame switches vary by manufacturer, by

temperature, by length, and by application, it is important to use the factory authorized replacement only.

Hi-Lo801

Spark Igniter

Eaton Spark Igniter

Piezo Igniter with Nut

Gas Heater Service Info.

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Remington HH-70T-KFA Service Manual Page 124

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