Barometric Damper; Flue Connection; Required Clearances - Patterson-Kelley MACH C1500 Installation And Owner's Manual

MACH® Series Gas-Fired Boiler
Vent design calculations should be based on a
maximum of 0.44" W.C. combined frictional
resistance across the air inlet duct and the stack, with a
stack temperature of 185° F (gross) and a CO
9.2% on natural gas. Consult your local vent
manufacturer for proper sizing.

3.6.1 Barometric Damper

WARNING!
Do not use a barometric damper with this
boiler. (This is a positive pressure system;
combustion gas may leak into the room.)

3.6.2 Flue Connection

Note: Additional information is contained in the
venting supplement "MACH-07VG".
The outlet of the boiler is a metric female pipe with a
gasket. It requires a male adapter that is 9.79" OD as
the mating piece. This adapter should be obtained
from the venting manufacturer and will be specific for
this boiler. The connection from the boiler to the stack
should be as direct as possible and any horizontal
breaching should have an upward slope at least 1/4
inch per linear foot.
This boiler should not be connected into any portion
of another mechanical draft system without
consulting your venting manufacturer. This boiler
level of shall not be connected to any part of a vent system
2
serving a Category I appliance, nor shall a Category I
appliance be connected to any part of the vent system
serving this appliance.
Note: If the vent is erected vertically directly from
the boiler outlet, make sure that the weight of the vent
is not supported by the boiler vent collar. The
collar is not designed to support the weight of the
vent. Structural support and spacing from
combustible surfaces must be in accordance with the
vent manufacturer's requirements.

3.6.3 Required Clearances

Provide clearances between combustion air intake,
exhaust vent, roof and wall surfaces, doors and
window, and snow line as shown in the following
diagrams. All dimensions should take into account
the snow line for the installation area.
WARNING!
Do not locate intake or exhaust terminations
directly above a walkway; dripping of conden-
sation can cause icing of the walking surface.
Page 9
Installation