Smith Cast Iron Boilers Series 28A - Manual (Page 11)

Page 11 SERIES 28A BOILER INSTALLATION AND OPERATION INSTRUCTIONS
Figure 8 - Burner Mounting Plate Details
Figure 9 - Observation Port Assembly Observation Port Assembly, Figure 9
1.
Position the hinged end of the steel flapper door,
# 5, over the boss on the observation port cover,
# 4.
2. Drive the expansion pin, # 7, through the hinge
bosses to secure the door to the cover.
3. Insert the hex bolt, # 6, through the hole in the
observation port cover.
4. Install the spring, nut and knob, #"s 3, 2 & 1 on the
bolt as shown. Use the nut as a jam nut against the
knob.
5. Apply the insulating tape to the back of the
observation port cover as shown.