Installation; Venting - Modine Manufacturing PTP Installation And Service Manual

InsTAllATIon - venTIng
W ARNING
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 an existing heater is being replaced, 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 (NFPA 54) or CSA B149.1 - latest
edition. Failure to follow these instructions can result in
serious injury or death.
4. Under no circumstances should 2 sections of double wall
vent pipe be joined together within 1 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 PTP 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 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 CATegorY I vent systems ➀
C HorIzonTAl CATegorY III vent systems ➀
 The differences between Vertical and Horizontal vent systems 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 (NFPA 54) 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.
A3. All heaters come with a factory installed vent adapter for
attaching the vent pipe to the heater (see Table 6.1). 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.
6
by vent system Type
A4. Refer to Table 6.1 for total minimum and maximum vent
lengths, making the system as straight as possible. The
equivalent length of a 90° elbow is 5 feet for 4 inch
diameter and 7 feet for 6 inch diameter.
Table 6.1 - vent Pipe diameters, Transitions, and
Total equivalent vent Pipe lengths for Horizontal
venting systems
model vent Pipe
size diameter
150 4"
175-200
4"
250-400
6"
A5. 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.
A6. Fasten individual lengths of vent together with at least 3
corrosion-resistant sheet metal screws.
A7. 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).
A8. 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
Single
Wall
Single Wall Vent Pipe Terminating
with Double wall vent pipe. 
Clearance Specified
by Type B Vent Mfg.
Single Wall Vent Pipe
 See Instruction A12 for attaching single wall pipe to double wall pipe
6-560.4
equivalent vent length
minimum
3'
3'
3'
Double Wall Vent Pipe 
Specified
Terminal
Flashing
Listed
Clearance Specified
Thimble
by Type B Vent Mfg.
Double
Wall
Single
Wall
Listed
Thimble
maximum
50'
70'
70'
Specified
Terminal
Flashing
Specified
Terminal
Specified
Terminal