General

KH 418 Evenheat Kiln

Chamber Dimensions: 18" Deep x 6.5" Wide x 4.25" High Max Temperature: 2200°F

Heat Treat Oven – Kiln (Evenheat) for the heat treating of metals for knife making, gunsmithing, automotive and general machine shop work.

Evenheat Knife/Heat Treat Ovens are a controlled heat source designed for the sole purpose of heat treating metals

Thermocouple:

The thermocouple is a temperature sensor.
Located in the ceiling of the oven.
Standard thermocouple is known as a Type K. The term “Type K” refers to the type of alloys used to manufacture the thermocouple.
Thermocouple needs no maintenance other than replacement if it fails. Failure of the thermocouple is seen as an error message on the controls.
The thermocouple must be replaced with another Type K thermocouple.
To replace the thermocouple first unplug the oven and allow it to return to room temperature.
The thermocouple is part of an assembly is located in the ceiling of the oven.
Remove the 2 screws that fasten the assembly to the oven and pull it from the oven.
Loosen the 2 screws that fasten the thermocouple to the oval shaped block and remove the thermocouple.
Attach the replacement thermocouple to the oval shaped block with the red thermocouple lead to the red thermocouple lead wire.
Tighten the screws.

Control Relay Replacement via the Relay Access Port:

The oven uses a device called a relay (a.k.a. contactor) to control power to the heating element.
During use the relay continually turns on and off to maintain the proper kiln temperature.
The relay is a service part and is likely to need replacing at some point.
To replace the relay use the external, relay access port.
The relay access port allows relay replacement by removing the access plate located on the outside of the kiln control enclosure

Fire Brick:

The insulating fire brick while strong, can be damaged with rough handling.
Damage that is small or minor may be ignored.
Any brick damage that affects performance should be repaired or replaced, such as brick that holds the heating elements in place.

Control Fuse:

The electronic controls are protected with a control fuse located in a fuseholder on the backside of the oven control panel.
The fuse is rated at 250V/250mA, slo-blo.
If replacement is necessary, replace only with a fuse of the same rating.

Cleaning:

Period vacuuming of the oven chamber removes debris that may damage the heating elements.
A gentle vacuuming with a soft brush is perfect.
Pay particular attention to the element grooves.
Unplug the oven before vacuuming.
The oven jacket is Stainless Steel and requires no real maintenance or cleaning.
The oven control panel requires no cleaning.

                                              END OF THE PROCEDURE