Crown Boiler 16 Series and, Installation And Operating Instructions Manual, Page: 20 / 48

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9) Series 16 boilers are supplied with an external draft hood which must be installed as shown in Figure 15 without
alteration. Before installing the draft hood, verify that the model number marked on the draft hood matches that of
the boiler being installed. Prior to securing the draft hood verify that the distance from the top of the jacket to the
bottom of the draft hood skirt matches dimension ‘E’ in Figure 1. Secure the draft hood to the boiler with at least
three screws.
10) Vent pipe should slope upwards from the draft hood not less than one inch in four feet. No portion of vent pipe
should run downward or have sags. Vent pipe must be securely supported.
11) Vent pipe should be installed above the bottom of the chimney to prevent blockage.
12) Vent pipe must be inserted flush with inside face of the chimney liner and the space between vent pipe and
chimney sealed tight.
13) On all Series 16 boiler models install the blocked vent switch assembly to the supplied external draft hood. See
Figure 16. The assembly consists of power cord and switch attached to mounting bracket and is shipped taped to the
top of boiler jacket. The procedure is outlined below:
a) Untape blocked vent switch assembly from top of boiler. Uncoil power cord.
b) Position mounting bracket onto lower edge of draft hood skirt. Locate center tooth (with #10 sheet metal screw)
on outside and other two teeth inside draft hood skirt. See Figure 16.
c) Slide mounting bracket tight against lower edge of draft hood skirt. Position #10 sheet metal screw above skirt's
stiffening rib.
d) Secure bracket in position by tightening #10 sheet metal screw against outer surface of draft hood skirt.
e) Make sure that there is no slack in the power cord between the cable clamp on the junction box and the blocked
vent switch on the draft hood.
f) Verify power cord, mounting bracket and blocked vent switch are secure and located as shown in Figure 16.
14) Do not install the optional vent damper in any portion of the vent system which is used by appliances other than the
boiler being installed.
15) Vent damper installation is optional on all Series 16 model boilers. When used, install the vent damper (Figure 17) as
follows:
a) Open vent damper carton and remove installation instructions. Read the instructions thoroughly before
proceeding.
Verify that vent damper is same size as draft diverter outlet. See Figure 1. Unpack vent damper carefully.
Do not
force closed damper blade. Forcing vent damper closed may result in damaged gear train and void warranty.
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Figure 15: Typical Venting
Arrangement For The Series
16 Boiler
( O P T I O N A L )