6-580.10
5H0782130000
November, 2014
INSTALLATION AND SERVICE MANUAL
power vented gas-fired unit heaters
models PDP and BDP
All models approved for use in California by the CEC and
in Massachusetts. Unit heater is certified for non-residential
applications.
FOR YOUR SAFETY
The use and storage of gasoline or other
flammable vapors and liquids in open containers
in the vicinity of this appliance is hazardous.
W ARNING
1. Improper installation, adjustment, alteration,
service, or maintenance can cause property
damage, injury, or death, and could cause
exposure to substances which have been
determined by various state agencies to
cause cancer, birth defects, or other
reproductive harm. Read the installation,
operating, and maintenance instructions
thoroughly before installing or servicing
this equipment.
2. Do not locate ANY gas-fired units in areas
where chlorinated, halogenated, or acidic
vapors are present in the atmosphere.
These substances can cause premature
heat exchanger failure due to corrosion,
which can cause property damage, serious
injury, or death.
FOR YOUR SAFETY
WHAT TO DO IF YOU SMELL GAS:
1. Open windows.
2. Do not try to light any appliance.
3. Do not touch any electrical switch; do not
use any phone in your building.
4. Extinguish any open flame.
5. Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions. If you can not reach your gas
supplier, call your fire department.
IMPOR
The use of this manual is specifically intended
for a qualified installation and service agency.
All installation and service of these units
must be performed by a qualified installation
and service agency.
Inspection on Arrival
1. Inspect unit upon arrival. In case of damage, report it
immediately to transportation company and your local
Modine sales representative.
2.
Check rating plate on unit to verify that power supply meets
available electric power at the point of installation.
3. Inspect unit upon arrival for conformance with description of
product ordered (including specifications where applicable).
Table of Contents
Inspection on Arrival ................................. 1
Special Precautions ................................. 2
SI (Metric) Conversion Factors ........................ 3
Before You Begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Unit Location ...................................... 4
Combustible Material and Service Clearances .......... 4
Unit Mounting .................................... 5
Installation ........................................ 6
Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Gas Connections ................................ 10
High-Altitude Accessory Kit .........................11
Electrical ...................................... 13
Start-Up Procedure/Operation ........................ 15
Unit Components .................................. 18
Performance Data - General ......................... 19
Performance Data - Downturn Hoods .................. 22
Dimensions....................................... 24
Service/Troubleshooting............................. 26
Serial/Model Number Designations . . . . . . . . . . . . . . . . . . . 29
Commercial Warranty........................Back Cover
T
ANT
THIS MANUAL IS THE PROPERTY OF THE OWNER.
PLEASE BE SURE TO LEAVE IT WITH THE OWNER WHEN YOU LEAVE THE JOB.
SPECIAL PRECAUTIONS
SPECIAL PRECAUTIONS
THE INSTALLATION AND MAINTENANCE INSTRUCTIONS IN
THIS MANUAL MUST BE FOLLOWED TO PROVIDE SAFE,
EFFICIENT AND TROUBLE-FREE OPERATION. IN ADDITION,
PARTICULAR CARE MUST BE EXERCISED REGARDING THE
SPECIAL PRECAUTIONS LISTED BELOW. FAILURE TO
PROPERLY ADDRESS THESE CRITICAL AREAS COULD
RESULT IN PROPERTY DAMAGE OR LOSS, PERSONAL
INJURY, OR DEATH. THESE INSTRUCTIONS ARE SUBJECT
TO ANY MORE RESTRICTIVE LOCAL OR NATIONAL CODES.
HAZARD INTENSITY LEVELS
1. DANGER: Indicates an imminently hazardous situation
which, if not avoided, WILL result in death or serious injury.
2. WARNING: Indicates a potentially hazardous situation
which, if not avoided, COULD result in death or serious injury.
3. CAUTION: Indicates a potentially hazardous situation which,
if not avoided, MAY result in minor or moderate injury.
4. IMPORTANT: Indicates a situation which, if not avoided,
MAY result in a potential safety concern.
DANGER
Appliances must not be installed where they may be exposed
to a potentially explosive or flammable atmosphere.
ARNING
W
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 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.
5. All field gas piping must be pressure/leak tested prior to
operation. Never use an open flame. Use a soap solution
or equivalent for testing.
6. Gas pressure to appliance controls must never exceed
14" W.C. (1/2 psi).
7. To reduce the opportunity for condensation, the minimum
sea level input to the appliance, as indicated on the serial
plate, must not be less than 5% below the rated input, or
5% below the minimum rated input of dual rated units.
8. Disconnect power supply before making wiring
connections to prevent electrical shock and equipment
damage.
9. All appliances must be wired strictly in accordance with
wiring diagram furnished with the appliance. Any wiring
different from the wiring diagram could result in a hazard
to persons and property.
10. Any original factory wiring that requires replacement must
be replaced with wiring material having a temperature
rating of at least 105°C.
11. Ensure that the supply voltage to the appliance, as
indicated on the serial plate, is not 5% greater than the
rated voltage.
W ARNING
12. When servicing or repairing this equipment, use only
factory-approved service replacement parts. A complete
replacements parts list may be obtained by contacting
the factory. Refer to the rating plate on the appliance for
complete appliance model number, serial number, and
company address. Any substitution of parts or controls not
approved by the factory will be at the owner's risk.
CAUTION
1. All literature shipped with this unit should be kept for
future use for servicing or service diagnostics. Do not
discard any literature shipped with this unit.
2. Consult piping, electrical, and venting instructions in this
manual before final installation.
3. Do not attach ductwork, air filters, or polytubes to any
propeller unit heater.
4. Clearances to combustible materials are critical. Be sure
to follow all listed requirements.
5. Heaters are designed for use in heating applications with
ambient startup temperatures between -40°F and 90°F
and ambient operating temperatures between 40°F and
90°F.
6. Do not install unit outdoors.
7. In garages or other sections of aircraft hangars such as
offices and shops that communicate with areas used for
servicing or storage, keep the bottom of the unit at least
7' above the floor unless the unit is properly guarded to
provide user protection from moving parts. In parking
garages, the unit must be installed in accordance with the
standard for parking structures ANSI/NFPA 88A - latest
edition, and in repair garages the standard for repair
garages NFPA 30A - latest edition (formerly NFPA 88B).
In Canada, installation of heaters in airplane hangars
must be in accordance with the requirements of the
enforcing authority, and in public garages in accordance
with the current CSA-B149 codes.
8. In aircraft hangars, keep the bottom of the unit at least 10'
from the highest surface of the wings or engine enclosure
of the highest aircraft housed in the hangars and in
accordance with the requirements of the enforcing
authority and/or NFPA 409 - latest edition.
9. Installation of units in high humidity or salt water
atmospheres will cause accelerated corrosion, resulting
in a reduction of the normal life of the units.
10. Do not install units below 7' measured from the bottom of
the unit to the floor in commercial applications (unless unit
is properly guarded to provide user protection from
moving parts).
11. Be sure no obstructions block air intake and discharge of
unit heaters.
12. The minimum distance from combustible material is based
on the combustible material surface not exceeding 160°F.
Clearance from the top of the unit may be required to be
greater then the minimum specified if heat damage, other
than fire, may occur to materials above the unit heater at
the temperature described.
13. Allow 18" of clearance at rear (or 12" beyond end of
motor at rear of unit, whichever is greater) and access
side to provide ample air for proper operation of fan.
14. Installation must conform with local building codes or in
the absence of local codes, with the National Fuel Gas
Code, ANSI Z223.1 (NFPA 54) - latest edition. In Canada
installation must be in accordance with CSA-B149.1.
2
6-580.10
SPECIAL PRECAUTIONS / SI (METRIC) CONVERSION FACTORS
BEFORE YOU BEGIN
CAUTION
15. Purging of air from gas supply line should be performed
as described in the National Fuel Gas Code, ANSI Z223.1
(NFPA 54) - latest edition. In Canada, installation must be
in accordance with CSA-B149.1.
16. When leak testing the gas supply piping system, the
appliance and its combination gas control must be
isolated during any pressure testing in excess of 14" W.C.
(1/2 psi).
17. The unit should be isolated from the gas supply piping
system by closing its field installed manual shut-off valve.
This manual shut-off valve should be located within 6’ of
the heater.
18. Turn off all gas before installing appliance.
19. Ensure that the supply voltage to the appliance, as
indicated on the serial plate, is less than 5% below the
rated voltage.
20. Check the gas inlet pressure at the unit upstream of the
combination gas control. The inlet pressure should be
6-7" W.C. on natural gas or 12-14" W.C. on propane. If
inlet pressure is too high, install an additional pressure
regulator upstream of the combination gas control.
21. Service or repair of this equipment must be performed by
a qualified service agency.
22. Do not attempt to reuse any mechanical or electronic
ignition controller which has been wet. Replace defective
controller.
IMPOR T ANT
1. To prevent premature heat exchanger failure, do not locate
ANY gas-fired appliances in areas where corrosive vapors
(i.e. chlorinated, halogenated, or acidic) are present in the
atmosphere.
2. To prevent premature heat exchanger failure, the input to
the appliance as indicated on the serial plate, must not
exceed the rated input by more than 5%.
3. Start-up and adjustment procedures must be performed
by a qualified service agency.
1. All literature shipped with this unit should be kept for future
use for servicing or service diagnostics. Leave manual with
the owner. Do not discard any literature shipped with this unit.
2. Consult piping, electrical, and venting instructions in this
manual before final installation.
3. Do not attach ductwork, air filters, or polytubes to any
propeller unit heater.
In the U.S., the installation of these units must comply with the
National Fuel Gas Code, ANSI Z223.1 (NFPA 54) - latest edition
and other applicable local building codes. In Canada, the
installation of these units must comply with local plumbing or
waste water codes and other applicable codes and with the
current code CSA-B149.1.
1. All installation and service of these units must be
performed by a qualified installation and service agency
only as defined in ANSI Z223.1 (NFPA 54) - latest edition
or in Canada by a licensed gas fitter.
2. This unit is certified with the controls furnished. For
replacements parts, please order according to the
replacement parts list on serial plate. Always know your
model and serial numbers. Modine reserves the right to
substitute other authorized controls as replacements.
3. Unit is balanced for correct performance. Do not alter fan
or operate motors at speeds below what is shown in this
manual.
4. Information on controls is supplied separately.
5. The same burner is used for natural and propane gas.
SI (Metric) Conversion Factors
To Convert Multiply By To Obtain
°F (°F-32) x 5/9 °C
BTU 1.06 kJ
Btu/ft
Btu/hr 0.000293 kW
CFH (ft
CFH (ft
CFM (ft
CFM (ft
feet 0.305 m
Gal/Hr. 0.00379 m
Gal/Hr. 3.79 l/hr
gallons 3.79 l
Horsepower 746 W
inches 25.4 mm
pound 0.454 kg
psig 6.89 kPa
psig 27.7 "W.C.
"W.C. 0.249 kPa
3
3
3
3
CAUTION
3
37.3 kJ/m
/hr) 0.000472 m3/min
/hr) 0.00000787 m3/s
/min) 0.0283 m3/min
/min) 0.000472 m3/s
3
3
/hr
6-580.10
3
SI (METRIC) CONVERSION FACTORS / UNIT LOCATION
A
D
B
C
Access
Side
UNIT LOCATION
DANGER
Appliances must not be installed where they may be exposed
to a potentially explosive or flammable atmosphere.
CAUTION
1. Clearances to combustible materials are critical. Be sure
to follow all listed requirements.
2. Heaters are designed for use in heating applications with
ambient startup temperatures between -40°F and 90°F and
ambient operating temperatures between 40°F and 90°F.
3. Do not install unit outdoors.
4. In garages or other sections of aircraft hangars such
as offices and shops that communicate with areas used for
servicing or storage, keep the bottom of the unit at least
7' above the floor unless the unit is properly guarded.
In parking garages, the unit must be installed in accordance
with the standard for parking structures ANSI/NFPA 88A -
latest edition, and in repair garages the standard for repair
garages NFPA 30A - latest edition (formerly NFPA 88B).
In Canada, installation of heaters in airplane hangars must
be in accordance with the requirements of the enforcing
authority, and in public garages in accordance with the
current CSA-B149 codes.
5. In aircraft hangars, keep the bottom of the unit at least
10' from the highest surface of the wings or engine
enclosure of the highest aircraft housed in the hangars
and in accordance with the requirements of the enforcing
authority and/or NFPA 409 – latest edition.
6. Installation of units in high humidity or salt water
atmospheres will cause accelerated corrosion resulting in
a reduction of the normal life of the units.
IMPORTANT
To prevent premature heat exchanger failure, do not locate
ANY gas-fired appliances in areas where corrosive vapors (i.e.
chlorinated, halogenated or acidic) are present in the atmosphere.
Location Recommendations
1. When locating the heater, consider general space and
heating requirements, availability of gas and electrical
supply, and proximity to vent locations.
2. Avoid installing units in extremely drafty locations. Drafts
can cause burner flames to impinge on heat exchangers
which shortens life. Maintain separation between units so
discharge from one unit will not be directed into the inlet
of another.
3. Be sure the structural support at the unit location site is
adequate to support the unit's weight. For proper operation
the unit must be installed in a level horizontal position.
4. Do not install units in locations where the flue products can
be drawn into the adjacent building openings such as
windows, fresh air intakes, etc.
5. Be sure that the minimum clearances to combustible
materials and recommended service clearances are
maintained. Units are designed for installation on non-
combustible surfaces with the minimum clearances shown
in Figure 4.1 and Tables 4.1 and 4.2.
6. Units exposed to inlet air temperatures of 40°F or less,
may experience condensation, therefore, provisions should
be made for disposal of condensate.
7. When locating units, it is important to consider that the
exhaust vent piping must be connected to the outside
atmosphere.
8. Maximum equivalent vent lengths are listed in "Section A -
4
General Instruction - All Units" of the Venting Instructions.
9. Do not install units in locations where gas ignition system
is exposed to water spray, rain, or dripping water.
10. Do not install units below 7', measured from the bottom
of the unit to the floor, unless properly guarded to provide
protection from moving parts.
Figure 4.1 - Combustible Material and Service Clearances
Table 4.1 - Combustible Material Clearances ➀
Model Side Side Top Bottom Exhauster
Size (A) (B) (C) (D) (Not shown)
150-175 1" 1" 4" 12" 2"
200-400 1" 1" 5" 12" 3"
➀ Provide sufficient room around the heater to allow for proper
combustion and operation of fan. Free area around the heater must
not be less than 1-1/2 times the discharge area of the unit.
Access Non-Access Top of Power
Table 4.2 - Recommended Service Clearances
Model Side Side Top Bottom Exhauster
Size (A) (B) (C) (D) (Not shown)
150-175 18" 18" 6" 22" 2"
200-400 18" 18" 6" 25" 3"
Access Non-Access Top of Power
Combustion Air Requirements
The National Fuel Gas Code defines an “unconfined space” as
a space whose volume is greater than 50 cubic feet per 1,000
Btu/Hr input of the installed appliance(s). A confined space is
50 cubic feet or less per 1,000 Btu/Hr input of the installed
appliance(s).
Units installed in tightly sealed buildings or confined spaces
must be provided with two permanent openings, one near the
top of the confined space and one near the bottom. Each
opening should have a free area of not less than one square
inch per 1,000 BTU per hour of the total input rating off all units
in the enclosure, freely communicating with interior areas
having, in turn adequate infiltration from the outside.
For further details on supplying combustion air to a confined
(tightly sealed) space or unconfined space, see the National
Fuel Gas Code ANSI Z223.1 (NFPA 54) or CSA-B149.1
Installation Code - latest edition.
Sound and Vibration Levels
All standard mechanical equipment generates some sound and
vibration that may require attenuation. Libraries, private offices
and hospital facilities will require more attenuation, and in such
cases, an acoustical consultant may be retained to assist in the
application. Locating the equipment away from the critical area
is desirable within ducting limitations. Generally, a unit should
be located within 15' of a primary support beam. Smaller
deflections typically result in reduced vibration and noise
transmission.
6-580.10
INSTALLATION
UNIT MOUNTING
1. Be sure the means of suspension is adequate to support the
weight of the unit (see pages 24 and 25 for unit weights).
2. For proper operation and to assure that flames are directed
into the center of the heat exchanger tubes, the unit must be
installed in a level horizontal position. Use a spirit level to
ensure that the unit is suspended correctly.
3. Clearances to combustibles as specified in Figure 4.1 and
Ta bles 4.1 and 4.2 must be strictly maintained.
4. All standard units are shipped fully boxed. Larger units are
also supplied with skid supports on the bottom of the box.
The larger units may be lifted from the bottom by means of a
fork lift or other lifting device only if the shipping support skids
are left in place and the forks support the whole depth of the
unit. If the unit must be lifted from the bottom for final
installation without the carton in place, be sure to properly
support the unit over its entire length and width to prevent
damage. When lifting units, make sure the load is balanced.
5. Propeller models up to size 350 have 2 mounting holes, size
350 and above have 4 mounting holes and blower models up
to size 350 have 4 mounting holes, size 350 and above
have 6 mounting holes. Units with two point suspension
incorporate a level hanging feature. Depending on what
options and accessories are being used, the heater may not
hang level as recieved from the factory. Do not hang heaters
with deflector hoods until referring to the “Installation Manual
for Deflector Hoods” and making the recommended
preliminary adjustments on the heater, while the heater is
resting on the floor. The units can be mounted with 3/8"-16
threaded rod as follows:
• On each piece of threaded rod used, screw a nut a
distance of about 1" onto the end of the threaded rods that
will be screwed into the unit heater.
• Place a washer over the end of the threaded rod and
screw the threaded rod into the unit heater weld nuts on
the top of the heater at least 5 turns, and no more than
10 turns. Tighten the nut first installed onto the threaded
rod to prevent the rod from turning.
• Drill holes into a steel channel or angle iron at the same
center-line dimensions as the heater that is being installed.
The steel channels or angle iron pieces need to span and
be fastened to appropriate structural members.
• Cut the threaded rods to the preferred length, place them
through the holes in the steel channel or angle iron and
secure with washers and lock nuts or lock washers and
nuts. A double nut arrangement can be used here instead
of at the unit heater (a double nut can be used both places
but is not necessary).
• Do not install standard unit heaters above the maximum
mounting height shown in Table 19.1.
NOTE: A pipe hanger adapter kit, shown in Figure 5.2 is
available as an accessory. One kit consists of two drilled
3/4" IPS pipe caps and two 3/8" - 16 x 1-3/4" capscrews to
facilitate threaded pipe suspension. Two kits would be
required for PDP unit sizes 350 and 400 and all BDP units
except size 350 and 400, and 3 kits for BDP unit sizes 350
and 400.
Figure 5.1 - Adjustable Mounting Brackets - To Adjust:
1. Remove outer side panels.
2. “Set screws” - loosen and
position bracket where needed
– then tighten set screws.
3. Re-attach outer side panels.
Figure 5.2 - Suspension Methods
(Suspension with Pipe Adapter Kit)
6-580.10
5
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 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 the National Fuel Gas Code,
ANSI Z223.1 (NFPA 54) - latest edition. In Canada installation
must be in accordance with CSA B149.1.
Model PDP and BDP 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:
Instructions
A General Instructions for ALL Installations
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".
Applicable Installation Instructions
by Vent System Type
in Table 6.1, making the vent system as straight as
possible. The equivalent length of a 5" elbow is 6' 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" 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
3 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.
Table 6.1 - Vent Pipe Diameters, Transitions, and
Total Equivalent Vent Pipe Lengths for Horizontal
Vent Systems
Model Vent Transition Vent Pipe Minimum Maximum
Size Included Diameter Eqv Length Eqv Length
150, 175 4" to 5" 5" 2' 60'
200 6" to 5" 5" 2' 60'
250-400 Not required 6" 2' 70'
Figure 6.1 - Venting Through Combustible Roof or Wall
Single Wall Vent Pipe
Double Wall Vent Pipe
Specified
Terminal
Specified
Terminal
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 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.
A4. Limit the total equivalent vent pipe length to fall between
the minimum and maximum equivalent vent lengths given
6
Flashing
Listed
Thimble
Single
Wall
Single Wall Vent Pipe Terminating
with Double wall vent pipe.
Clearance Specified
by Type B Vent Mfg.
Single Wall Vent Pipe
Listed
Thimble
See Instruction A12 for attaching single wall pipe to double wall pipe.
6-580.10
Flashing
Clearance Specified
by Type B Vent Mfg.
Double
Wall
Specified
Terminal
Single
Wall
Specified
Terminal
INSTALLATION - VENTING
A10. When the vent passes through a combustible INTERIOR
wall or floor, a metal thimble 4" greater than the vent
diameter is necessary. If there is 6' or more of vent pipe in
the open space between the appliance and where the
vent pipe passes through the wall or floor, the thimble
need only be 2" greater than the diameter of the vent
pipe. If a thimble is not used, all combustible material
must be cut away to provide 6" of clearance. Where
authorities have jurisdiction, Type B vent may be used for
the last section of vent pipe to maintain clearance to
combustibles while passing through wall or floor. See
Figure 6.1. Any material used to close the opening must
be noncombustible.
A11. All seams and joints of the single wall pipe must be sealed
with metallic tape or silastic suitable for temperatures up to
400°F. Wrap the tape 2 full turns around the vent pipe.
One continuous section of double wall vent pipe may be
used within the vent system to pass through the wall to the
listed vent cap. Refer to instruction A12 in “Section A –
General Instructions – All Units” for attaching double wall
pipe to single wall pipe.
A12. The following are general instructions for double wall
(Type B) terminal pipe installation:
How to attach a single wall vent terminal to
double wall (Type B) vent pipe:
1. Look for the “flow” arrow on the vent pipe.
2. Slide the vent terminal inside the exhaust end of the
double wall vent pipe.
3. Drill 3 holes through the pipe and the vent terminal.
Using 3/4" long sheet metal screws, attach the cap to
the pipe. Do not over tighten.
How to connect a single wall vent system to a
double wall (Type B) vent pipe:
1. Slide the single wall pipe inside the inner wall of the
double wall pipe.
2. Drill 3 holes through both walls of the single and double
wall vent pipes. Using 3/4" sheet metal screws, attach
the 2 pieces of pipe. Do not over tighten.
3. The gap between the single and double wall pipe must
be sealed but it is not necessary to fill the full volume
of the annular area. To seal, run a large bead of 400°F
silastic around the gap.
A13. Vent termination clearances must be maintained:
Table 7.1 - Vent Termination Clearances
Minimum Clearances for
Structure Vent Terminal Location
Forced air inlet within 10' 3' above
Combustion air inlet of another
appliance 6' all directions
Door, window, gravity air inlet, 4' horizontal and below
or any building opening 1' above
Electric meter, gas meter, gas 4' horizontal (U.S.)
regulator, and relief equipment 6' horizontal (Canada)
Gas regulator
6' horizontal (Canada)
Adjoining building or parapet wall 6' all directions
Adjacent public walkways 7' all directions
Grade (ground level) 3' above
Do not terminate the vent directly above a gas meter or regulator.
A14. Do NOT vent this appliance into a masonry chimney.
A15. Do NOT use dampers or other devices in the vent or
combustion air pipes.
3' horizontal (U.S.)
6-580.10
A16. The venting system must be exclusive to a single
appliance and no other appliance is allowed to be vented
into it.
A17. Precautions must be taken to prevent degradation of
building materials by flue products.
A18. Single wall vent pipe must not pass through any
unoccupied attic, inside wall, concealed space, or floor.
A19. Uninsulated single wall vent pipe must not be used
outdoors for venting appliances in regions where the 99%
winter design temperature is below 32°F.
A20. The vent terminal must be:
Table 7.2 - Vent Terminals
Model Size Modine PN Other Listed Terminals
150-200 5H0722850001
250-400 5H0722850002
Gary Steel 1092, Tjernlund VH1,
Starkap, Selkirk, or Constant
Air-Flo 2433 style
A21. If left hand (facing front of heater with air blowing in face)
power exhauster discharge is desired, the power
exhauster may be rotated 180°. To do this, remove the
screws in the vent collar, rotate the power exhauster, then
replace the screws.
A22. In addition to following these general instructions, specific
instructions for Vertical Category I or Horizontal Category
III vent systems must also be followed. The following
outlines the differences:
Table 7.3 - ANSI Unit Heater Venting Requirements
Category Description Venting Requirements
I
II
III
IV
Note: Vent connectors serving Category I appliances shall not be connected
into any portion of mechanical draft systems operating under positive pressure.
Negative vent pressure
Non-condensing
Negative vent pressure
Condensing
Positive vent pressure
Non-condensing
Positive vent pressure
Condensing
Follow standard venting
requirements.
Condensate must be
drained.
Vent must be gas tight.
Vent must be liquid and
gas tight. Condensate
must be drained.
Vertical Category I Vent
• Vertical vent systems terminate vertically (up) (an example
is shown in Figure 8.1).
• The horizontal portion of the vent run cannot exceed 75%
of the vertical rise (Example: If the vent height is 10', the
horizontal portion of the vent system cannot exceed 7.5').
• The vent terminates a minimum of 5' above the vent
connector on the unit.
• If the vent system to be installed meets ALL these criteria
(an example is shown in Figure 8.1), proceed to “Section B
- Vertical Vent System Installation”. For all other cases,
proceed to the next section for Horizontal Category III Vent
System Determination:
Horizontal Category III Vent
• Horizontal vent systems terminate horizontally (sideways)
(an example is shown in Figure 9.2).
• A vent system that terminates vertically but has a
horizontal run that exceeds 75% of the vertical rise is
considered horizontal.
• Horizontal vent configurations are Category III. Additional
requirements are covered in “Section C - Horizontal
Category III Vent System Installation”.
7
INSTALLATION - VENTING
Section B – Vertical Vent System Installation
B1. This section applies to vertically vented Category I
vent systems and is in addition to “Section A – General
Instructions – All Units”.
B2. Vertical vent systems terminate vertically and must be sized
in accordance with the National Fuel Gas Code,
ANSI Z223.1 (NFPA 54) - latest edition.
B3. The horizontal portion of the vent run cannot exceed 75%
of the vertical rise (Example: If the vent height is 10', the
horizontal portion of the vent system cannot exceed 7.5').
B4. It is recommended to install a tee with drip leg and clean out
cap as shown in Figure 8.1.
B5. The vent terminates a minimum of 5' above the vent
connector on the unit.
B6. All vertically vented heaters that are Category I must be
connected to a vent complying with a recognized standard,
with a material acceptable to the authority having jurisdiction.
Venting into a masonry chimney is not permitted. Refer to
the National Fuel Gas Code, ANSI Z223.1 (NFPA 54) - latest
edition for instructions on common venting.
B7. Use a listed vent terminal to reduce down drafts and
moisture in the vent.
B8. Double wall vent pipe is recommended, although single wall
can be used if the requirements of the National Fuel Gas
Code are followed.
B9. Vertical vents must terminate a minimum horizontal and
vertical distance from roof lines and adjacent walls or
obstructions. These minimum distances are outlined as
follows (based on National Fuel Gas Code requirements for
vents with diameters less than 12"):
• For double wall vent pipe and 8' or greater horizontal
distance to any vertical wall or similar obstruction, the
vent must terminate above the roof in accordance with
Figure 8.1 and Table 8.1.
• For double wall vent pipe and less than 8' horizontal
distance to any vertical wall or similar obstruction, the vent
must terminate at least 2' above the highest point where it
passes through a roof of a building and at least 2' higher
than any portion of a building within a horizontal distance of
10' (see Figure 8.1).
Figure 8.1 - Vertical Category I Vent System
X
ROOF PITCH IS:
X / 12
BACK VIEW
12
USE LISTED THIMBLE
THROUGH ROOF AND
CEILING
RECOMMENDED
"H" MIN*
4" MIN
EXHAUST
12" MIN
LISTED TERMINAL
ROOF FLASHING
TEE WITH DRIP LEG
AND CLEANOUT CAP
(SLOPE 1/4" PER
FOOT DOWNWARD
TOWARD DRIP LEG)
Table 8.1 - Minimum Height from Roof to Lowest
Discharge Opening
Rise X (in) Roof Pitch Min Height H (ft) ➀
0-6 Flat to 6/12 1.00
6-7 6/12 to 7/12 1.25
7-8 7/12 to 8/12 1.50
8-9 8/12 to 9/12 2.00
9-10 9/12 to 10/12 2.50
10-11 10/12 to 11/12 3.25
11-12 11/12 to 12/12 4.00
12-14 12/12 to 14/12 5.00
14-16 14/12 to 16/12 6.00
16-18 16/12 to 18/12 7.00
18-20 18/12 to 20/12 7.50
20-21 20/12 to 21/12 8.00
➀ Size according to expected snow depth.
• For single wall vent pipe and 10' or greater horizontal
distance to any portion of a building, the vent must
terminate at least 2' above the highest point where it
passes through a roof of a building and at least 2' higher
than any portion of a building within a horizontal distance
of 10'.
• For single wall vent pipe and less than 10' horizontal
distance to any portion of a building, the vent must
terminate at least 2' higher than any portion of that building.
8
6-580.10
INSTALLATION - VENTING
Section C – Horizontal, Category III Vent System
Installation
C1. This section applies to horizontally vented Category III
vent systems and is in addition to “Section A – General
Instructions – All Units”.
C2. Horizontal vent systems terminate horizontally (sideways).
C3. All seams and joints must be sealed with metallic tape or
silastic suitable for temperatures up to 400°F. Wrap the
tape 2 full turns around the vent pipe. For single wall vent
systems, 1 continuous section of double wall vent pipe may
be used within the vent system to pass through the wall
to the listed vent cap. Under no circumstances should 2
sections of double wall vent pipe be joined together within
1 vent system due to the inability to verify complete seal of
inner pipes. Refer to instruction A10 in “Section A – General
Instructions – All Units” for attaching double wall pipe to
single wall pipe.
C4. Refer to Table 9.1 for total minimum and maximum vent
lengths, making the system as straight as possible. The
equivalent length of a 90° elbow is 6' for 5" diameter and
7' for 6" diameter.
C5. All horizontal Category III vents must be terminated with a
listed vent cap. The cap must terminate a minimum distance
beyond the exterior wall surface as shown in Figure 9.2 and
Table 9.1. The vent must be supported as shown in Figure
9.1. Precautions must be taken to prevent degradation of
building materials by flue products.
Figure 9.2 - Horizontal Venting
C9. For a vent termination located under an eave, the distance
of the overhang must not exceed 24". The clearance to
combustibles above the exterior vent must be maintained
at a minimum of 12". Consult the National Fuel Gas Code
for additional requirements for eaves that have ventilation
openings.
C10. Once venting is complete, proceed to the section titled
“Installation – Gas Connections”.
Table 9.1 - Dimension Between Vent Cap and
Exterior Wall
Vent Terminal “A” Min.
Selkirk, Starkap, or Constant Air-Flo 2433 12"
Gary Metals 1092 or Modine 5H072285 6"
Tjernlund VH1 0"
Figure 9.1 - Exhaust Vent Construction Through
Combustible Walls and Support Bracket
C6. When condensation may be a problem, the vent system shall
not terminate over public walkways or over an area where
condensate or vapor could create a nuisance or hazard or
could be detrimental to the operation of regulators, relief
openings, or other equipment.
C7. The venting system must be exclusive to a single unit, and
no other unit is allowed to be vented into it.
C8. When vented horizontally, maintain a 1/4" per foot rise away
from the heater and place a drip leg with clean out near the
unit as shown in Figure 9.2. Where local authorities have
jurisdiction, a 1/4” per foot downward slope is acceptable
with a drip leg and clean out near the exit of the vent as
shown in Figure 9.2, or allow the condensate to drip out
the end.
6-580.10
9
INSTALLATION
GAS CONNECTIONS
WARNING
1. All field gas piping must be pressure/leak tested prior
to operation. Never use an open flame. Use a soap
solution or equivalent for testing.
2. Gas pressure to appliance controls must never exceed
14" W.C. (1/2 psi).
3. To reduce the opportunity for condensation, the minimum
sea level input to the appliance, as indicated on the serial
plate, must not be less than 5% below the rated input, or
5% below the minimum rated input of dual rated units.
CAUTION
1. Purging of air from gas lines should be performed as
described in the National Fuel Gas Code, ANSI Z223.1
(NFPA 54) - latest edition or in Canada CSA-B149 codes.
2. When leak testing the gas supply piping system, the
appliance and its combination gas control must be
isolated during any pressure testing in excess of
14" W.C. (1/2 psi).
3. The unit should be isolated from the gas supply piping
system by closing its field installed manual shut-off valve.
This manual shut-off valve should be located within 6' of
the heater.
4. Turn off all gas before installing appliance.
IMPORTANT
To prevent premature heat exchanger failure, the input to
the appliance, as indicated on the serial plate, must not
exceed the rated input by more than 5%.
1. Installation of piping must conform with local building codes,
or in the absence of local codes, with the National Fuel Gas
Code, ANSI Z223.1 (NFPA 54) - Latest Edition. In Canada,
installation must be in accordance with CSA-B149.1.
2. Piping to units should conform with local and national
requirements for type and volume of gas handled, and
pressure drop allowed in the line. Refer to Table 10.1 to
determine the cubic feet per hour (cfh) for the type of gas
and size of unit to be installed. Using this cfh value and
the length of pipe necessary, determine the pipe diameter
from Table 10.2. Where several units are served by the
same main, the total capacity, cfh and length of main must
be considered. Avoid pipe sizes smaller than 1/2". Table
10.1 allows for a 0.3" W.C. pressure drop in the supply
pressure from the building main to the unit. The inlet
pressure to the unit must be 6-7" W.C. for natural gas and
11-14" W.C. for propane gas. When sizing the inlet gas
pipe diameter, make sure that the unit supply pressure
can be met after the 0.3" W.C. has been subtracted. If the
0.3" W.C. pressure drop is too high, refer to the Gas
Engineer’s Handbook for other gas pipe capacities.
3. Install a ground joint union with brass seat and a manual
shut-off valve adjacent to the unit for emergency shut-off
and easy servicing of controls, including a 1/8" NPT
plugged tapping accessible for test gauge connection
(see Figure 10.1).
4. Use 2 wrenches when connecting field piping to units.
5. Provide a sediment trap before each unit and in the line
where low spots cannot be avoided (see Figure 10.1).
6. When pressure/leak testing, pressures above 14" W.C.
(1/2 psi), close the field installed shut-off valve, disconnect
the appliance and its combination gas control from the
gas supply line, and plug the supply line before testing.
When testing pressures 14" W.C. (1/2 psi) or below, close
the manual shut-off valve on the appliance before testing.
10
Figure 10.1 - Recommended Sediment Trap/Manual
Shut-off Valve Installation for Gas Connection
➀
➀ Manual shut-off valve is in the “OFF” position when handle is perpendicular
to pipe.
Table 10.1 - Sea Level Manifold Pressure & Gas
Consumption ➀
Model Size
150
175
200
250
300
350
400
Manifold Pressure
("W.C.)
CFH 138.1 58.0
Orifice Drill Size 21 39
CFH 166.7 70.0
Orifice Drill Size 28 43
CFH 190.5 80.0
Orifice Drill Size 25 42
CFH 238.1 100.0
Orifice Drill Size 18 36
CFH 285.7 120.0
Orifice Drill Size 21 39
CFH 333.3 140.0
Orifice Drill Size 23 41
CFH 381.0 160.0
Orifice Drill Size 25 42
Natural Propane
3.5 10
Table 10.2 - Gas Pipe Capacities - Natural Gas ➀ ➁
Pipe
Length (ft)
10 132 278 520 1050 1600 3050
20 92 190 350 730 1100 2100
30 73 152 285 590 890 1650
40 63 130 245 500 760 1450
50 56 115 215 440 670 1270
60 50 105 195 400 610 1150
70 46 96 180 370 560 1050
80 43 90 170 350 530 930
100 38 79 150 305 460 870
125 34 72 130 275 410 780
150 31 64 120 250 380 710
➀ Capacities in cubic feet per hour through Schedule 40 pipe with maximum
0.3" W.C. pressure drop with up to 14" W.C. gas pressure. Specific gravity is
0.60 for natural gas and 1.50 for propane gas.
➁ For pipe capacity with propane gas, divide natural gas capacity by 1.6.
Example: What is the propane gas pipe capacity for 60' of 1-1/4" pipe? The
natural gas capacity is 400 CFH. Divide by 1.6 to get 250 CFH for propane gas.
1/2" 3/4" 1" 1-1/4" 1-1/2" 2"
6-580.10
Natural Gas
# of
Orifices
2Gal/Hr. Propane - 1.64
3Gal/Hr. Propane - 1.86
3Gal/Hr. Propane - 2.19
3Gal/Hr. Propane - 2.74
4Gal/Hr. Propane - 3.29
5Gal/Hr. Propane - 3.84
6Gal/Hr. Propane - 4.38
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