Remington HH-70T-KFA Wartungshandbuch PDF herunterladen (Seite 8)

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DESA Service Information

H.S.I. Oil Fired Heaters

Component Description and Operation

Hot Surface Ignition Heaters (HSI)

On hot surface ignition (HSI) heaters the ignition control board (ICB) is what controls the entire heater electronically.

There is no reset button and no motor start relay, with exception to some older HSI models. The ICB takes care of those

components internally. Older HSI models have a motor start relay inline with motor and the ICB. The ICB needs to

maintain a reading from the photocell to keep the heater running. All boards are now equipped with an inline fuse that is

located on the board or in the main voltage supply line to the board. The fuse is a common GMA-10 fuse that can be

found at a local automotive parts retail store or electrical supply store. The ICB should be handled with care. Always

handle the board by its edges and never touch the male terminals or the electronics on the board. The oils from your skin

can transfer to the ICB and cause a hot spot and will result in failure in the operation of the board. When a board

becomes dirty, you should wipe it with a clean cotton cloth. Rubbing alcohol can be used if a solvent is needed.

A photocell for a Hot Surface heater works entirely differently than one from a Solid State heater. An HSI photocell

actually looks at the COLOR of the flame inside the combustion chamber. Under normal operating conditions, the flame

will be orange in color. If the heater begins to burn lean, the flame begins to turn a blue in color. The photocell reacts

almost immediately and shuts down the heater. A drop in pressure will cause the change in color of the flame thus causing

a changed light intensity. This sequence will cause the photocell to build up enough resistance to force the heater to shut

down in less than ONE SECOND. This makes proper air pressure adjustment crucial. See specs on the proper air pressure

adjustment on your model.

Glowbar

Proper Handling

Handle the glowbar with care. Do not touch the heating element with bare fingers. The oils from your skin can cause a

hot spot on the heating element, which could result in the glowbar disintegrating. Handle the glowbar by its ceramic

mounting block only. If a glowbar becomes dirty, use a clean cotton cloth to wipe debris or dust off the heating element.

When installing the glowbar, it is important not to strike the heating element on any surface. Doing so will cause the

glowbar to shatter. Carefully follow the recommended instructions when installing a new glowbar.

Installation

1. Unplug the heater from the 120 volt source.

2. Remove the two wires for the existing glowbar from the pc board mounted inside the access panel.

3. Disconnect the air line and fuel line from the fittings on the nozzle adapter or burner head. Note the location

placement of the hoses to avoid confusion on reconnection. If you have an older heater with a burner head, skip step

4 and go to step 5.

4. Leave the nozzle bracket attached to the combustion chamber and

carefully remove the nozzle by twisting the nozzle adapter in a counter clockwise motion.

5. Remove the combustion chamber from the lower shell of the heater.

6. Stand the combustion chamber up on a workbench in a vertical position, nose cone down.

7. Loosen the set screw from ceramic mounting block on glowbar and carefully remove the glowbar.

8. Install new glowbar into combustion chamber, taking special care not to strike the heating element upon entry.

9. Replace the set screw with a black oxide mounting screw to avoid future vibration problems with original set screw.

Repeat steps 2 – 5 in reverse order to re-install combustion chamber.

Oil Heater Service Info.

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Remington HH-70T-KFA Wartungshandbuch Seite 8