New Buck Corporation 20 Room Heater - Manual (Page 46)

Problem
6. Substrate Cracking—
Mechanical
7. Substrate
Crumbling
8. Color
Variations
Possible Cause
1. Mishandling or abuse
1. Extreme thermal shock
2. High
draft
1. Variation in color from
combustor to combustor or
within a combustor can
occur (new combustors)
Solution
1. Handle
with care
1. Combustor being contin-
ually overfired. Reduce burn
rate.
2. Do not exceed .06” of water
draft. Install a manual
damper and draft gauge, or a
barometric damper with
free-standing units
1. These color variations are
normal and do not affect
combustor performance