Venting - Modine Manufacturing PTS Installation And Service Manual

InsTAllATIon - venTIng
WARNING
1. Gas fired heating equipment must be vented - do not
operate unvented.
2. A built-in power exhauster is provided - additional external
power exhausters are not required or permitted.
3. If you are replacing an existing heater, it may be
necessary to resize the venting systems. Improperly sized
venting systems can result in vent gas leakage or the
formation of condensate. Refer to the National Fuel Gas
Code ANSI Z223.1 or CSA B149.1 latest edition. Failure
to follow these instructions can result in serious injury or
death.
4. Under no circumstances should two sections of double
wall vent pipe be joined together within one horizontal
vent system due to the inability to verify complete seal of
inner pipes.
CAUTION
Installation must conform with local building codes or in the
absence of local codes, with Part 7, Venting of Equipment, of
the National Fuel Gas Code, ANSI Z223.1 (NFPA 54) - latest
edition. In Canada installation must be in accordance with
CSA B149.1.
Model PTS/BTS unit heaters must be vented with the proper
passageway as described in these instructions to convey flue
gases from the unit or the vent connector to the outside
atmosphere. The heaters must also have a separate
combustion air intake pipe to bring in fresh air for combustion
from the outside atmosphere.
The venting instructions are organized in sections, based on
installation type. The sections are identified as follows:
Applicable Installation Instructions
Instructions
General Instructions for All installations
A
B verTICAl 2-PIPe vent systems ➀
C HorIzonTAl 2-PIPe vent systems ➀
HorIzonTAl And verTICAl ConCenTrIC
D
vent systems ➀
➀ The differences between Vertical and Horizontal vent systems in 2-Pipe or
Concentric Vent configurations will be identified in "Section A - General
Instructions – All Units".
section A - general Instructions - All units
A1. If the unit heater being installed is replacing existing
equipment and using the existing vent system from that
equipment, inspect the venting system for proper size and
horizontal pitch, as required in the National Fuel Gas Code
ANSI Z223.1 or CSA B149.1 Installation Code-latest edition
and these instructions. Determine that there is no blockage
or restriction, leakage, corrosion and other deficiencies,
which could cause an unsafe condition.
A2. The vent pipe should be galvanized steel or other suitable
corrosion resistant material. Follow the National Fuel Gas
Code for minimum thickness of vent material. The minimum
thickness for connectors varies depending on the pipe
diameter. Do not vent unit with PVC or other forms of
plastic venting material.
6
by vent system Type
A3. All heaters come with factory installed vent and combustion
air adapters for attaching the vent pipe to the heater (4" for
model sizes 150-200, 6" for model sizes 250-400). Attach
the vent pipe to the adapter with 3 corrosion resistant
screws. (Drill pilot holes through the vent pipe and adapter
prior to screwing in place). Vent pipe must not be smaller
than the connector size.
A4. Limit the total equivalent vent pipe length to a minimum of
5' and a maximum of 50' for model sizes 175-400 (25' for
the model size 150 unit), making the vent system as
straight as possible. The equivalent length of a 4" elbow is
5' and for a 6" elbow is 7'.
A5. A minimum of 12" straight pipe is recommended from the
flue outlet before turns in the vent pipe.
A6. Horizontal sections of vent pipe are to be installed with a
minimum downward slope from the appliance of 1/4 inch
per foot and suspended securely from overhead structures
at points not greater than 3' apart.
A7. Fasten individual lengths of vent together with at least three
corrosion resistant sheet metal screws.
A8. Keep single wall vent pipe at least 6" from combustible
materials. For double wall vent pipe, follow the vent pipe
manufacturer's clearances to combustibles. The minimum
distance from combustible materials is based on the
combustible material surface not exceeding 160°F.
Clearance from the vent pipe (or the top of the unit) may be
required to be greater than 6" if heat damage other than fire
could result (such as material distortion or discoloration).
A9. Avoid venting through unheated space when possible.
When venting does pass through an unheated space or if
the unit is installed in an environment that promotes
condensation, insulate runs greater than 5' to minimize
condensation. Inspect for leakage prior to insulating and
use insulation that is noncombustible with a rating of not
less than 400°F. Install a tee fitting at the low point of the
vent system and provide a drip leg with a clean out cap as
shown in Figure 8.1.
figure 6.1 - venting Through Combustible roof
or Wall
Single Wall Vent Pipe
Listed
Thimble
Single
Wall
Single Wall Vent Pipe Terminating
with Double wall vent pipe. ➀
Clearance Specified
by Type B Vent Mfg.
Single Wall Vent Pipe
Listed
Thimble
➀
See Instruction A12 for attaching single wall pipe to double wall pipe
6-561
Double Wall Vent Pipe ➀
Specified Specified
Terminal
Terminal
Flashing
Flashing
Clearance Specified
by Type B Vent Mfg.
Double
Wall
Specified
Terminal
Single
Wall
Specified
Terminal