PB Heat Peerless Boilers GM Series, Installation, Operation & Maintenance Manual

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12
A. DRAFT HOOD
1. The boiler is equipped with a draft hood designed
to:
a. provide for the ready escape of flue gases from
the boiler in the event of no draft.
b. prevent a backdraft from entering the boiler.
c. control stack draft during operation.
The draft hood must be installed without alteration.
Make certain there are no obstructions to airflow to
the relief opening.
2. Position draft hood with 1” (25 mm) diameter hole
in conical portion of draft hood (for vent safety
shutoff switch) towards front right corner of boiler.
Secure to flue collector with sheet metal screws. See
Figure 4.1.
B. BLOCKED VENT SWITCH
Attach blocked vent switch assembly to draft hood as
shown in Figure 4.1. GM-e-05/06 assembly includes
a factory installed adapter plate to connect the 5/8”
diameter switch to the 1” diameter hole in the draft
hood. To adjust harness length, squeeze strain relief
bushing to release from jacket. Remove excessive slack
in harness.
4. VENTING
VENTING
Figure 4.2: Venting Multiple Appliances
SHEET METAL
SCREWS
BLOCKED VENT
SWITCH ASSEMBLY
BLOCKED VENT
SWITCH WIRING
HARNESS
Figure 4.1: Draft Hood and Vent Safety Shutoff
Switch Installation