34
34
Each heating unit has two types of emitter
tubes. The first tube section, connected to
the burner, will be Calcoat, silver in color
marked with yellow paint.
The remaining tubes are mild steel marked
with blue paint. Exception: 175,000
through 225,000 Btu units require a sec-
ond section of Calcoat, 20ft total, steel
tube connected together by a high tem-
perature coupling, see Figure 1, pg. 34.
All other tube connections are made with
a band coupling, see Figure 1 pg. 34
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