Firebrick Replacement: (as necessary)
DO NOT ATTEMPT TO REPLACE THE BRICKS OR PADS WITH A BED OF HOT COALS OR WHEN THE BRICKS ARE TOO HOT TO HANDLE.
Firebrick may occasionally require replacement. Firebrick breakage will occur as it is normal for brick to become more fragile with age and continued high temperature use. When significant breakage has occurred, it is necessary to replace the old firebrick and pads with new material (contact your GARN® dealer or DECTRA for replacement brick and pad).
When replacing firebrick in your GARN® WHS unit it is imperative that:
• The firebrick be placed over a ¼” brick pad • Only Hi-duty or better firebrick be used; DO NOT use intermediate duty brick
The brick pad (Part #P-0026) is used for three reasons and can be purchased at the GARN Store:
• To cushion the brick and help absorb the impact of logs during fuel loading • Provide insulation to maintain higher fire bed temperatures. • Provide a “slip interface” to allow the firebrick to expand without inducing excessive stress. Firebrick is available in numerous sizes and ratings. Some brick is “fired” (oven cured) and other brick is not. In order to achieve high efficiency and lower emissions, it is necessary to maintain high fire bed temperatures. Use only ASTM rated Hi-duty or better fired brick for replacement. Hi-duty brick has a minimum temperature rating of 2,700 °F. Common or intermediate duty fire brick has a rating of 2,200 F. Never use unfired or patio type brick. Two sizes of firebrick are used in the GARN® WHS 1000, 1500 and 2000 models, and can be purchased at the GARN Store:
• #1 splits, each brick measuring 4 ½” x 9” x 1 ¼” thick , part # P-0073 • #2 splits, each brick measuring 4 ½” x 9” x 2” thick , part # P-0074
The thicker bricks (#2 splits) are positioned on the flat bottom of the chamber. The thinner (#2 splits) are positioned on both inclined sides of the chamber. Three ¼” thick, flexible high temperature pads are placed between the steel combustion chamber and the firebrick.
Remove old brick and pad:
1) Properly remove and dispose of existing materials. 2) Clean the combustion chamber underneath where the brick and pad are set. Some of the pad may stick to the steel of the chamber.
Install new brick and pad:
1) Inspect the heat shield and its insulation mat around the primary air nozzle. If needed, order a replacement from DECTRA or your GARN® dealer and install before installing any brick. If the shield and pad are in good shape, reuse them.
GARN WHS 1000 and WHS 2000 Manual © HY-C Company LLC - September 2024
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