LAARS Pennant PNCV User Manual
Installation and Operation Instructions Document 1204D
Heating Systems Company
A subsidiary of CorporationBRADFORD WHITE
®
®
Installation and Operation
Instructions for
Low Temperature
™
PENNANT
Hydronic Boiler
Model PNCH
Water Heater
Model PNCV
FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician,
qualified in hot water boiler installation and maintenance. Improper installation and/or operation could
create carbon monoxide gas in flue gases which could cause serious injury, property damage, or
death. Improper installation and/or operation will void the warranty. For indoor installations, as an
additional measure of safety, Laars strongly recommends installation of suitable Carbon Monoxide
detectors in the vicinity of this appliance and in any adjacent occupied spaces.
WARNING
If the information in this manual is not
followed exactly, a fire or explosion may
result causing property damage, personal
injury or loss of life.
Do not store or use gasoline or other
flammable vapors and liquids in the vicinity of
this or any other appliance.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not
use any phone in your building.
• Immediately call your gas supplier from
a nearby phone. Follow the gas supplier's
instructions.
• If you cannot reach your gas supplier, call
the fire department.
Installation and service must be performed
by a qualified installer, service agency, or gas
supplier.
Assurez-vous de bien suivres les instructions
données dans cette notice pour réduire au
minimum le risque d’incendie ou d’explosion ou
pour éviter tout dommage matériel, toute blessure
ou la mort.
Ne pas entreposer ni utiliser d’essence ni d’autres
vapeurs ou liquides inflammables dans le voisinage
de cet appareil ou de tout autre appareil.
QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ:
• Ne pas tenter d’allumer d’appareils.
• Ne touchez à aucun interrupteur. Ne pas vous
servir des téléphones dansle bâtiment où vous
trouvez.
• Appelez immédiatement votre fournisseur de
gaz depuis un voisin. Suivez les instructions
du fournisseur.
• Si vous ne pouvez rejoindre le fournisseur de
gaz, appelez le sservice des incendies.
L’installation et l’entretien doivent être assurés par
un installateur ou un service d’entretien qualifié ou
par le fournisseur de gaz.
AVERTISSEMENT
H2319100D
Page 2
LAARS Heating Systems
TABLE OF CONTENTS
SECTION 1. General Information
1.1 Introduction ...................................................... 3
1.2 Model Identication .......................................... 4
1.3 Warranty .......................................................... 4
1.4 Dimensions ...................................................... 4
1.5 Locating the Appliance..................................... 4
1.6 Locating Pump-Mounted Water Heater
with Respect to Storage Tank(s) ...................... 6
1.7 Locating Pump-Mounted Boiler with
Respect to Return/Supply Header ................... 6
1.8 Locating Appliance for Correct
Horizontal Vent/Ducted Air Distance
From Outside Wall ........................................... 6
SECTION 2. Venting and Combustion Air
2.1 Combustion Air ................................................ 7
2.1.1 Combustion Air From Room ............................ 7
2.1.2 Intake Combustion Air...................................... 7
2.2 Venting ............................................................. 8
2.2.1 Vent Categories ............................................... 8
2.2.2 Category I Vent ................................................ 8
2.2.3 Common Venting Systems .............................. 8
2.2.4 Category III Vent .............................................. 9
2.3 Locating Vent & Combustion Air Terminals ...... 9
2.3.1 Side Wall Vent Terminal ................................... 9
2.3.2 Side Wall Combustion Air Terminal ................ 12
2.3.3 Vertical Vent Terminal .................................... 12
2.3.4 Vertical Combustion Air Terminal ................... 12
2.4 Common Vent Test – Boilers ......................... 12
2.5 Vent Terminals for Outdoor Units ................... 13
SECTION 3. Gas Supply and Piping
3.1 Gas Supply and Piping .................................. 14
SECTION 4A.
Water Connections – Pennant Boiler
4A.1 Heating System Piping:
Hot Supply Connections – Boiler ................... 16
4A.2 Cold Water Make-Up – Boiler ........................ 16
4A.3 Water Flow Requirements – Boiler ................ 16
4A.4 Freeze Protection – Boiler ............................. 16
SECTION 4B. Water Connections –
Pennant Water Heater
4B.1 Water System Piping – Water Heater ............ 17
4B.2 Hot Water Supply Piping – Water Heater ...... 17
4B.3 Water Flow Requirements – Water Heater .... 17
4B.4 Combined Water (potable)
Heating and Space Heating ........................... 17
4B.5 Freeze Protection – Water Heater ................. 17
SECTION 5. Electrical Connections
5.1 Main Power .................................................... 20
5.1.1 Sizes 500-1500 .............................................. 21
5.1.2 Sizes 1750-2000 ............................................ 21
5.1.3 Separate Pump Circuit................................... 21
5.1.4 All Sizes ......................................................... 21
5.2 Field Wiring ................................................... 21
SECTION 6. Operating Instructions
6.1 Filling the Boiler System ................................ 28
6.2 Sequence of Operation .................................. 28
6.3 Temperature (Operating) Control ................... 29
6.3.1 Temperature Control Overview ...................... 29
6.3.2 Programming Parameters-Boilers ................. 29
6.3.3 Programming Parameters-Water Heaters ..... 30
6.4 Limit Controls ................................................. 30
6.5 Operating the Burner and Set Up .................. 30
6.5.1 Set Up for 0 to 2500 Feet Altitude.................. 30
6.5.2 High Altitude Adjustment and Set Up ............. 31
6.6 Shutting Down the Pennant ........................... 31
6.7 To Restart the Pennant .................................. 31
SECTION 7. Maintenance
7.1 System Maintenance ..................................... 32
7.2 Appliance Maintenance and
Component Description ................................. 32
7.2.1 Burners .......................................................... 32
7.2.2 Filter ............................................................... 33
7.2.3 Gas Valves ..................................................... 33
7.2.4 Manual Reset High Limit Control ................... 33
7.2.5 Automatic Reset High Limit Control ............... 33
7.2.6 Temperature Control ...................................... 33
7.2.7 Ignition Control............................................... 33
7.2.8 Ignitor ............................................................. 34
7.2.9 Transformer ................................................... 34
7.2.10 Blowers .......................................................... 34
7.2.11 Flow Switch ....................................................34
7.2.12 Heat Exchanger Coil ...................................... 34
SECTION 8. Trouble Shooting
8.1 Resolving Lockouts........................................ 35
8.2 Delayed Ignition – Possible Causes .............. 35
8.3 Short Cycling – Boiler .................................... 35
8.4 Short Cycling – Water Heater ........................ 36
8.5 High Gas Consumption.................................. 36
8.6 Troubleshooting Pennant Controls ................ 36
SECTION 9. Replacement Parts
9.1 General Information ....................................... 36
9.2 Parts List ........................................................ 36
Low Temperature Pennant
SECTION 1.
General Information
USING THIS MANUAL – Because the
Pennant Boilers and Pennant Water Heaters are
identical appliances, with the exception of materials
of manufacture, labels and ultimate use application,
this manual provides information for the proper
installation, operation and maintenance of both
products. Where differences exist between the
application of the appliances and their operation,
the sections pertinent to only one appliance or the
other will be so identied.
In the Commonwealth of Massachusetts, this
appliance must be installed by a licensed plumber or
gas tter.
WARNING
To minimize the risk of electric shock, fire or other
hazards which could result in property damage,
injury, or death. The Pennant hydronic, boiler or
water heater must be installed in accordance with
the procedures detailed in this manual, or the Laars
Heating Systems warranty may be voided. The
installation must conform to the requirements of
the local jurisdiction having authority, and, in the
United States, to the latest edition of the National
Fuel Gas Code, ANSI Z223.1/NFPA54. In Canada,
the installation must conform to the latest edition
of the Natural Gas and Propane Installation Code,
CSA B149.1 and/or applicable local codes. Where
Afin de réduire au minimum les risques de
commotion électrique, de feu ou d’autre nature,
qui pourraient causer des dommages matériels,
des blessures ou des accidents mortels, les
chaudières à eau chaude ou les chauffe-eau
Pennant doivent être installés conformément aux
directives détaillées contenues dans ce manuel, à
défaut de quoi la garantie fournie par Laars Heating
Systems serait annulée. L’installation doit être
conforme aux exigences de la réglementation locale
en vigueur et, aux États-Unis, à l’édition la plus
récente du Natural Fuel Gas Code (Code pour le
gaz combustible naturel) ANSI Z223.1/NFPA54. Au
Canada, l’installation doit respecter les exigences
de la plus récente édition du Code d’installation du
gaz naturel et du propane CSA B149.1, et/ou des
codes locaux de construction en vigueur. Lorsque
la réglementation locale l’exige, l’installation des
appareils électroménagers Pennant doit respecter
les exigences du Standard for Controls and Safety
Devices for Automatically Fired Boilers (Code pour
les équipements de commande et de sécurité des
chaudières à combustion automatique), ANSI/
ASME CSD-1. Toute modification apportée à la
chaudière, aux régulateurs de gaz ou au câblage,
peut compromettre la garantie. Si certaines
conditions particulières rendent des adaptations
nécessaires, consulter un représentant du fabricant
avant d’entreprendre ces modifications.
required by the authority having jurisdiction, the
installation of Pennant appliances must conform
to the Standard for Controls and Safety Devices
for Automatically Fired Boilers, ANSI/ASME
CSD-1. Any modifications to the boiler, its gas
controls, or wiring may void the warranty. If field
conditions require modifications, consult the factory
representative before initiating such modifications.
All application and installation procedures
should be reviewed completely before proceeding with
the installation. Consult the Laars Heating Systems
factory, or local factory representative, with any issues
or questions regarding this equipment. Experience
has shown that most operating issues are caused by
improper installation.
The Pennant appliance is protected against over
1.1 Introduction
This manual provides information necessary for
the installation, operation, and maintenance of Laars
Heating Systems’ Low temperature Pennant copper
tube appliances, sizes 500-2000 (standard appliances
pressurization. A pressure relief valve is tted to all
appliances. It is installed on the outlet header, at the
water outlet of the appliance.
IMPORTANT: The inlet gas pressure to the appliance
must not exceed 13 in. w.c. (3.2 kPa).
are covered in a separate manual). Read it carefully
before installation.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
P N C A C C 2
AVERTISSEMENT
Page 3
SERIES
P N C
USAGE
H
V
SIZE
0 5 0 0
0 7 5 0
1 0 0 0
1 2 5 0
1 5 0 0
1 7 5 0
2 0 0 0
FUEL
N
P
ALTITUDE
A
LOCATION
C
FIRING
MODE
C ON-OFF
REVISION
2
HEAT
EXCHANGER
B
C
N
P
OPTIONS
CODE
X
J
PUMP
OPTIONS
H
N
S
C
B
D
Page 4
LAARS Heating Systems
All installations must be made in accordance
with:
1) In the U.S., the " National Fuel Gas Code "ANSI
Z223.1/NFPA54, Latest Edition and all applicable
local codes as required by the Authorities Having
Jurisdiction (AHJ), or
2) In Canada, the "Natural Gas and Propane
Installation Code", CSA B149.1, latest edition and all
applicable local codes as required by the AHJ.
All electrical wiring is to be done in accordance with:
1). In the U.S., the "National Electrical Code" (NEC),
ANSI/NFPA 70, latest Edition and all applicable local
codes as required by the AHJ, or
2). In Canada, the “Canadian Electrical Code - Part
1”, CSA STD. C22.1 and all applicable local codes as
required by the AHJ.
This appliance must be electrically grounded in
accordance with the applicable codes and standards
referenced above.
1.2 ModelIdentication
Consult the rating plate on the unit. The
following information describes the model number
structure.
Model Character Designation
1-3 Model Series Designation
P N C = Pennant
4 Usage
H = Hydronic
V = Volume Water
5-8 Size
0 5 0 0 = 500,000 BTU/h input
0 7 5 0 = 750,000 BTU/h input
1 0 0 0 = 999,000 BTU/h input
1 2 5 0 = 1,250,000 BTU/h input
1 5 0 0 = 1,500,000 BTU/h input
1 7 5 0 = 1,750,000 BTU/h input
2 0 0 0 = 1,999,000 BTU/h input
9 Fuel
N = Natural Gas
P = Propane
10 Altitude
A = 0-10,000 feet
11 Location
C = Indoor and Outdoor
12 Firing Mode
C = On-Off
13 Revision
2 = Revision Level 2
14 Heat Exchanger
B = Glass-lined CI / copper / brz trim (std. PNCV)
C = Glass-lined cast iron / copper (std. PNCH)
N = Glass-lined cast iron / cu-nickel
P = Glass-lined cast iron / cu-nickel / brz trim
15 Option Code
X = Standard Low Temp Control
J = CSD-1, FM, IRI, IL
16 Pump Options
H = TACO, Hard water pump (PNCV only)
N = TACO, Normal water pump
S = TACO, Soft water pump (PNCV only)
C = B&G, Hard water pump (PNCV only)
B = B&G, Normal water pump
D = B&G, Soft water pump (PNCV only)
1.3 Warranty
Laars Heating Systems’ appliances are covered
by a limited warranty. Owners should submit online
warranty registration at www.Laars.com.
All warranty claims must be made to an authorized
Laars Heating Systems representative, directly to
Customer Service, or online at www.Laars.com.
Claims must include the serial number and model
(this information can be found on the rating plate),
installation date, and name of the installer. Shipping
costs are not included in the warranty coverage.
Some accessory items are shipped in separate
packages. Verify receipt of all packages listed on
the packing slip. Inspect everything for damage
immediately upon delivery, and advise the carrier of
any shortages or damage. Any such claims should be
led with the carrier. The carrier, not the shipper, is
responsible for shortages and damage to the shipment
whether visible or concealed.
1.4 Dimensions
See Figure 1.
1.5 Locating the Appliance
The appliance should be located to provide
clearances on all sides for maintenance and inspection.
It should not be located in an area where leakage of
any connections will result in damage to the area
adjacent to the appliance or to lower oors of the
structure.
When such a location is not available, it is
recommended that a suitable drain pan, adequately
drained, be installed under the appliance.
The appliance is design certied by CSAInternational for installation on combustible ooring;
in basements; in closets, utility rooms or alcoves.
Pennant Boilers or Water Heaters must never be
installed on carpeting. The location for the appliance
should be chosen with regard to the vent pipe lengths
and external plumbing. The unit shall be installed such
that the gas ignition system components are protected
from water (dripping, spraying, rain, etc.) during
operation and service (circulator replacement, control
replacement, etc.). When vented vertically, the Pennant
must be located as close as practical to a chimney or
outside wall. If the vent terminal and/or combustion
air terminal terminate through a wall, and there is
potential for snow accumulation in the local area, both
terminals should be installed at an appropriate level
Low Temperature Pennant
13.7
35
B
C
W*
V*
A
12.4
31
H
20.24
514
FRONT VIEW
REAR VIEW
W*
V*
TOP VIEW
FLOW SWITCH
INLET
OUTLET
3WAY ACTUATOR
TEMPERATURE
SWITCH
PRV
F
(W)
2
5
LEFT SIDE VIEW
PUMP
PUMP
G
(V)
19.7
50
41.5
105
35.3
89
29.3
74
7.75
20
13.8
35
13.7
35
RIGHT SIDE VIEW
D
C
W*
B
V*
E
Dimensions shown in
inches cm
Page 5
Size A B C D E F G H
500 33½ 85 15¾ 40 5¾ 15 29¾ 76 32¾ 83 7¾ 20 8¾ 22 46 117 6 15 8 20 6 15
750 45½ 11 6 21¾ 55 5¾ 15 29¾ 76 32¾ 83 7¾ 20 8¾ 22 58 147 6 15 10 25 8 20
Air
Conn.
W*
Vent
Conn.
V*
Horiz.
Vent
Pipe
1000 57½ 146 28¾ 73 5¾ 15 29¾ 76 32¾ 83 7¾ 20 7 18 70 178 8 20 10 25 8 20
1250 68 172 34 86 101∕826 30¾ 78 29½ 75 8¾ 22 8¾ 22 80 203 8 20 12 30 8 20
1500 78½ 199 39¾ 101 101∕826 30¾ 78 29½ 75 8¾ 22 8¾ 22 91 231 8 20 12 30 8 20
1750 89 226 44½ 113 101∕826 30¾ 78 29½ 75 8¾ 22 8¾ 22 101 256 8 20 14 36 8 20
2000 99½ 253 49¾ 126 101∕826 30¾ 78 29½ 75 8¾ 22 8¾ 22 112 284 12 30 14 36 12 30
*Air and vent connections may be on top or back of the Pennant, and are eld convertible. Dimensions in inches cm
Figure 1. Dimensional Data.
Page 6
LAARS Heating Systems
above grade such that blockage of the terminal from
accumulated debris or precipitation is prevented.
The dimensions and requirements that are shown
in Table 1 should be met when choosing the locations
for the appliance.
1.6 Locating Pump-Mounted Water Heater
with Respect to Storage Tank(s)
For best results, the Pennant water heater should
be located within 15 feet (4.6m) of the storage tank(s).
The pump is sized for 30 feet (9.1m) of piping.
If the appliance must be installed with longer
piping runs, then larger diameter pipe or tubing may be
acceptable. Consult the factory for assistance.
Appliance
Surface
Left Side 1 2.5 24 61
Right Side 1 2.5 24 61
Top 1 2.5 12 30
Back 1 2.5 12** 30**
Front 1 2.5 36 91
Vertical
(Category 1)
Vent
Horizontal
(Category 3)
Vent
*1" (2.5 cm) when b-vent is used.
**When vent and/or combustion air connects to the back,
recommended clearance is 36" (91cm).
Required
Clearance From
Combustible Material
inches cm inches cm
6* 15.2*
per UL 1738 venting
system supplier's
instructions
Table 1. Clearances.
Recommended
Service Access
Clearance
1.7 Locating Pump-Mounted Boiler with
Respect to Return/Supply Header
For the best results, Pennant should be located
within 15 feet (4.6m) of the supply and return headers.
The pump is sized for 30 feet (9.1m) of piping.
If the appliance must be installed with longer
piping runs, then larger diameter tubing may be
acceptable. Consult the factory for assistance.
1.8 Locating Appliance for Correct
Horizontal Vent/Ducted Air Distance
From Outside Wall
The forced draft combustion air blower(s) in the
appliance has/have sufcient power to pull air and vent
properly when the guidelines for horizontal air and
vent are followed (see Table 2).
NOTE: On some models, the vent collar size is
larger than the size of the vent pipe that can be
used. Vent collar size and horizontal pipe diameters
can be found in Table 1. The larger vent collar
size is to accommodate Category I (vertical) vent
systems.
NOTE: When located on the same wall, the
Pennant combustion air intake terminal must
be installed a minimum of 12" (30cm) below the
exhaust vent terminal and separated by a minimum
of 36 inches (91cm) horizontally.
The air intake terminal must be installed high
enough to avoid blockage from snow, leaves and other
debris.
Size
500 8 20 6 15 6 15 50 15 3 CA001401 20260701
750 10 25 8 20 6 15 50 15 3 CA001401 20260701
1000 10 25 8 20 8 20 50 15 3 CA001402 20260703
1250 12 30 8 20 8 20 50 15 3 CA001403 20260703
1500 12 30 8 20 8 20 50 15 3 CA001403 20260703
1750 14 36 8 20 8 20 50 15 3 CA001403 20260703
2000 14 36 12 30 12 30 50 15 3 CA001404 20260706
Vent Collar
Size
in cm in cm in cm ft m
Horizontal
Vent Pipe
Diameter
Table 2. Horizontal Vent / Combustion Air Parameters.
Intake
Air Collar
& Pipe
Diameter
Max. Pipe
Length
Max. No.
of Elbows
Side Vent
Terminal
Part Number
Side Wall
Combustion
Air Terminal
Part Number
Low Temperature Pennant
Page 7
SECTION 2.
Venting and Combustion Air
WARNING
For indoor installations, as an additional measure
of safety, Laars strongly recommends installation of
suitable Carbon Monoxide detectors in the vicinity of
this appliance and in any adjacent occupied spaces.
AVERTISSEMENT
Pour des installations intérieures, Laars
recommande fortement, comme mesure de sécurité
supplémentaire, l’installation de détecteurs de
monoxyde de carbone adaptés dans le voisinage
de l’appareil et dans chacune des pièces habitées
adjacentes.
2.1 Combustion Air
Pennant boilers and water heaters must have
provisions for combustion and ventilation air in
accordance with the applicable sections addressing
requirements for air for combustion and ventilation of
the National Fuel Gas Code, ANSI Z223.1. In Canada,
the applicable sections of the Natural Gas and Propane
Installation Code (CSA B149.1) must be followed. In
all cases any and all applicable local installation codes
must also be followed.
A Pennant appliance may receive combustion
air from the space in which it is installed, or it can be
ducted directly to the unit from the outside. Proper
ventilation air must be provided in either case.
2.1.1 Combustion Air From Room
In the United States, the most common
requirements specify that the space shall communicate
with the outdoors in accordance with method 1 or 2,
which follow. Where ducts are used, they shall be of
the same cross-sectional area as the free area of the
openings to which they connect.
Method 1: Two permanent openings, one
commencing within 12 inches (30 cm) of the top
and one commencing within 12 inches (30 cm) of
the bottom, of the enclosure shall be provided. The
openings shall communicate directly, or by ducts,
with the outdoors or spaces that freely communicate
with the outdoors. When directly communicating
with the outdoors, or when communicating to the
outdoors through vertical ducts, each opening shall
have a minimum free area of 1 square inch per 4000
Btu/hr (5.5 square cm/kW) of total input rating of all
equipment in the enclosure. When communicating to
the outdoors through horizontal ducts, each opening
shall have a minimum free area of not less than
1 square inch per 2000 Btu/hr (11 square cm/kW) of
total input rating of all equipment in the enclosure.
Table 3 shows data for this sizing method, for each
Pennant model.
Method 2: One permanent opening, commencing
within 12 inches (30 cm) of the top of the enclosure,
shall be permitted. The opening shall directly
communicate with the outdoors or shall communicate
through a vertical or horizontal duct to the outdoors
or spaces that directly communicate with the outdoors
and shall have a minimum free area of 1 square inch
per 3000 Btu/hr (7 square cm/kW) of the total input
rating of all equipment located in the enclosure. This
opening must not be less than the sum of the areas of
all vent connectors in the conned space.
Other methods of introducing combustion and
ventilation air are acceptable, providing they conform
to the requirements in the applicable codes listed
above.
In Canada, consult local building and safety
codes or, in absence of such requirements, follow
CSA B149.1, the Natural Gas and Propane Installation
Code.
2.1.2 Intake Combustion Air
The combustion air can be taken through the
wall, or through the roof. When taken from the wall, it
must be taken from out-of-doors by means of the Laars
horizontal wall terminal (see Table 2). When taken
from the roof, a eld-supplied rain cap or an elbow
arrangement must be used to prevent entry of rain
water (see Figure 2).
Use single-wall galvanized pipe, per Table
4, for the combustion air intake (see Table 2 for
appropriate size). Route the intake to the heater as
directly as possible. Seal all joints with tape. Provide
adequate hangers. The unit must not support the
weight of the combustion air intake pipe. Maximum
linear pipe length allowed is 50 feet (15.2m). Three
elbows have been calculated into the 50-foot (15.2m)
Size
500 125 807
750 188 1213
1000 250 1613
1250 313 2020
1500 375 2420
1750 438 2826
2000 500 3226
*Net Free Area in Square Inches / Square cm
Area indicated is for one of two openings; one at oor level
and one at the ceiling, so the total net free area could be
double the gures indicated.
This chart is for use when communicating directly with the
outdoors. For special conditions and alternate methods, refer
to the latest edition of ANSI Z223.1.
Note: Check with louver manufacturers for net free area of
louvers. Correct for screen resistance to the net free area
if a screen is installed. Check all local codes applicable to
combustion air.
Table 3. Combustion Air Openings.
Square inches Square cm
Each Opening*
Page 8
LAARS Heating Systems
linear run. Subtract 10 allowable linear feet (3.0m) for
every additional elbow used (see Table 2). When fewer
than 3 elbows are used, the maximum linear pipe
length allowed is still 50 feet (15.2m).
The connection for the intake air pipe is on the
lter box. Pennant appliances may have venting and
combustion air ducting attached to the top or the back.
They are shipped with the connections at the top. For
attaching either or both pipes to the back, the mounting
anges are reversible by removing the mounting
screws and orienting the anges in the desired
position. Replace the screws after positioning anges.
Run a bead of silicone around the collar and slide the
pipe over the collar. Secure with sheet metal screws.
In addition to air needed for combustion, air
shall also be supplied for ventilation, including all air
required for comfort and proper working conditions
for personnel. The Pennant loses less than 1 percent of
its input rating to the room, but other heat sources may
be present.
2.2 Venting
2.2.1 Vent Categories
Depending upon desired Pennant venting, it may
be considered a Category I or a Category III appliance.
In general, a vertical vent system will be a Category
I system. However, in rare instances, a Pennant’s
vertical vent system may be considered Category
III. In the U.S., the National Fuel Gas Code (ANSI
Z223.1), or in Canada the Natural Gas and Propane
Installation Code (CSA B149.1), denes a Category I
vent system, and includes rules and tables to size these
vent systems. If the Pennant’s vertical vent system
does not satisfy the criteria for Category I venting, it
must be vented as a Category III system.
All Pennant vent systems which discharge
horizontally (without the use of a power venter) are
considered Category III vent systems.
(negative) 0.1 in. w.c.
If using a power venter for any type of Category
I venting, the draft should be set between (negative)
0.01 and 0.05 in. w.c.
2.2.3 Common Venting Systems
Pennant units are Category I fan-assisted when
vented vertically and adhering to all applicable codes.
Pennant units are not allowed to be vented into a
common horizontal vent system, unless a properly
sized vent fan is used, and the common vent system
is properly designed by the vent fan manufacturer or
a qualied engineer. When common venting Pennant
fan-assisted unit with other appliances through
one shared vertical duct called a “common vent”,
special care must be taken by the installer to ensure
safe operation. In the event that the common vent
is blocked, it is possible, especially for fan-assisted
devices, to vent backwards through non-operating
appliances sharing the vent, allowing combustion
products to inltrate occupied spaces. If the
appliances are allowed to operate in this condition,
serious injury or death may occur.
WARNING
Operation of appliances with a blocked common
vent may lead to serious injury or death. Safety
devices must be implemented to prevent blocked
common vent operation. If safe operation of all
appliances connected to a common vent cannot
be assured, including prevention of spillage of flue
gasses into living spaces, common venting should
not be applied, and appliances should each be
vented separately.
2.2.2 Category I Vent
When vented as a Category I appliance, the
vent system must conform to the National Fuel Gas
Code (ANSI Z223.1-Latest Edition) in the U.S., or in
Canada, to the Natural Gas and Propane Installation
Code (CSA B149.1 latest edition). The vent system
must be sized and installed for a Category I FanAssisted Appliance.
If chimney height is greater than 25 feet, or
if multiple units are vented into the same vertical
vent, a barometric damper must be installed on each
appliance, such that the ue draft does not exceed
Term Description
Pipe Single-wall galvanized steel pipe, 24 gauge
minimum (either insulated or non-insulated)
Joint Sealing Permanent duct tape or aluminum tape
Table 4. Required Combustion Air Piping Material.
Figure 2. Combustion Air and Vent Through Roof.
Low Temperature Pennant
Page 9
AVERTISSEMENT
Le fonctionnement d’appareils connectés à un
évent commun bouché peut provoquer de sérieuses
blessures corporelles ou la mort. Des dispositifs de
sécurité doivent être mis en place pour empêcher
que les appareils soient utilisés avec un évent
commun bouché. Si un fonctionnement sécuritaire
de tous les appareils reliés à un évent commun et si
la prévention des dégagements accidentels de gaz
de combustion dans des zones habitées ne peuvent
pas être assurés, un évent commun ne doit pas
être mis en place et les appareils doivent être munis
d’évents individuels séparés.
It is for this reason that, in addition to
following proper vent sizing, construction and safety
requirements from the National Fuel Gas Code,
ANSI Z223.1 or in Canada, from the Natural Gas and
Propane Installation Code (CSA B149.1) as well as
all applicable local codes, it is required that installers
provide some means to prevent operation with a
blocked common vent. It is suggested that a blocked
vent safety system be employed such that if the switch
from one appliance trips due to excessive stack spill
or back pressure indicating a blocked vent condition,
that all appliances attached to the vent be locked out
and prevented from operating. Note that the Pennant
is equipped with a blocked vent safety (pressure)
switch, as shipped. However, this safety switch has
only been designed and tested to be effective in
installations where the Pennant is vented separately
and NOT common vented with other appliances. As an
additional precaution, it is recommended that a Carbon
Monoxide (CO) alarm be installed in all enclosed
spaces containing combustion appliances. If assistance
is required in determining how a blocked vent safety
system should be connected to a LAARS product,
please call Applications Engineering at the Rochester
phone number on the back cover of this manual.
Refer to the installation and operating
instructions on all appliances to be common vented
for instructions, warnings, restrictions and safety
requirements. If safe operation of all appliances
connected to a common vent cannot be assured,
including prevention of spillage of ue gases into
living spaces, common venting should not be applied,
and appliances should each be vented separately.
2.2.4 Category III Vent
When the Pennant is vented with horizontal
discharge, it must be installed per this installation
manual and the venting system manufacturer’s
installation instructions. The vent system must be
sealed stainless steel, per Table 5.
Route the vent pipe to the heater as directly as
possible. Seal all joints and provide adequate hangers
as required in the venting system manufacturer’s
installation instructions. Horizontal portions of the
venting system must be supported to prevent sagging
and may not have any low sections that could trap
condensate.
The unit must not support the weight of the vent
pipe. Horizontal runs must slope downwards not less
than ¼ inch per foot (2 cm/m) from the unit to the vent
terminal.
L’appareil ne doit pas supporter le poids de la
gaine d’évent. Les parties horizontales doivent être
installées avec une pente de 2 cm/m (1/4 inch par pied)
descendant de l’appareil vers la sortie de l’évent.
Reference Table 2 for the size of the Category
III vent system. Up to three elbows can be used with
50 linear feet (15.2m) of pipe. Subtract 10 allowable
linear feet (3.0m) for every additional elbow used.
2.3 Locating Vent & Combustion Air
Terminals
2.3.1 Side Wall Vent Terminal
The appropriate Laars side wall vent terminal
must be used, and is listed in the installation and
operation manual. The terminal provides a means of
installing the vent piping through the building wall,
and must be located in accordance with ANSI Z223.1/
NFPA 54 and applicable local codes. In Canada, the
installation must be in accordance with CSA B149.1
and local applicable codes. Consider the following
when installing the terminal:
1. Figure 3 shows the requirements for mechanical
vent terminal clearances for the U.S. and Canada.
2. Locate the vent terminal so that vent gases cannot
be drawn into air conditioning system inlets.
3. Locate the vent terminal so that vent gases cannot
enter the building through doors, windows,
gravity inlets or other openings. Whenever
possible, locations under windows or near doors
should be avoided.
4. Locate the vent terminal so that it cannot be
blocked by snow. The installer may determine
that a vent terminal must be higher than the
minimum shown in codes, depending upon local
conditions.
5. Locate the terminal so the vent exhaust does
not settle on building surfaces or other nearby
objects. Vent products may damage such surfaces
or objects.
6. If the boiler or water heater uses ducted
combustion air from an intake terminal located
on the same wall, locate the vent terminal at least
Term Description
Pipe Must comply with UL Standard 1738 such
as Type AL29-4C Stainless Steel
(either insulated or non-insulated).
Joint
Sealing
Table 5. Required Horizontal Venting Material.
Follow vent manufacturer's instructions.
Page 10
LAARS Heating Systems
U.S. Installations (see note 1) Canadian Installations (see note 2)
A= Clearance above grade, veranda, porch, 12 inches (30 cm) 12 inches (30 cm)
deck, or balcony
B= Clearance to window or door that may Direct Vent Only: 12 inches (30 cm)
be opened Other Than Direct Vent: 4 feet (1.2 m) below or 36 inches (91 cm)
to side of opening; 1 foot (30 cm) above opening
C= Clearance to permanently closed window See note 4 See note 5
D= Vertical clearance to ventilated soffit located
above the terminal within a horizontal See note 4 See note 5
distance of 2 feet (61cm) from the center line of the terminal
E= Clearance to unventilated soffit See note 4 See note 5
F= Clearance to outside corner See note 4 See note 5
G= Clearance to inside corner See note 4 See note 5
H= Clearance to each side of center line See note 4 3 feet (91 cm) within a height 15 feet
extended above meter/regulator assembly above the meter/regulator assembly
I= Clearance to service regulator vent outlet See note 4 3 feet (91 cm)
J= Clearance to non mechanical air supply Direct Vent Only: 12 inches (30 cm)
inlet to building or the combustion air inlet Other Than Direct Vent: 4 feet (1.2 m) below or 36 inches (91 cm)
to any other appliance to side of opening; 1 foot (30 cm) above opening
K= Clearance to a mechanical air supply inlet 3 feet (91 cm) above if within 10 feet (3 m) 6 feet (1.83 m)
horizontally
L= Clearance above paved sidewalk or paved Vent termination not allowed in this location Vent termination not allowed in this
driveway located on public property location
M= Clearance under veranda, porch, deck, See note 4 12 inches (30 cm) (see note 3)
or balcony
Notes:
1. In accordance with the current ANSI Z223.1 / NFPA 54 National Fuel Gas Code.
2. In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code.
3. Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
4. For clearances not specified in ANSI Z223.1 / NFPA 54, clearance is in accordance with local installation codes and the requirements of
the gas supplier.
5. For clearances not specified in CSA B149.1, clearance is in accordance with local installation codes and the requirements of the gas
supplier.
Figure 3. Vent Terminal Clearances.
Low Temperature Pennant
Page 11
3 feet (0.9m) horizontally from the combustion
air terminal, and locate the vent terminal at least
1 foot (0.3m) above the combustion air terminal.
WARNING
The outdoor vent terminal gets hot. Unit must be
installed in such a way as to reduce the risk of
burns from contact with the vent terminal.
AVERTISSEMENT
La sortie d’évent à l’extérieur devient très chaude.
Elle doit être installée de façon à réduire le risque
de brûlures au contact de l’extrémité de l’évent.
Important Note: Massachusetts Code Requirement.
From Massachusetts Rules and Regulations 248
CMR 5.08:
(a) For all side wall horizontally vented gas
fueled equipment installed in every dwelling,
building or structure used in whole or in
part for residential purposes, including those
owned or operated by the Commonwealth and
where the side wall exhaust vent termination
is less than seven (7) feet above nished grade
in the area of the venting, including but not
limited to decks and porches, the following
requirements shall be satised:
1. INSTALLATION OF CARBON MONOXIDE
DETECTORS.
At the time of installation of the side wall
horizontal vented gas fueled equipment, the
installing plumber or gastter shall observe that
a hard-wired carbon monoxide detector with
an alarm and battery back-up is installed on
the oor level where the gas equipment is to be
installed. In addition, the installing plumber or
gastter shall observe that a battery operated or
hard-wired carbon monoxide detector with an
alarm is installed on each additional level of the
dwelling, building or structure served by the side
wall horizontal vented gas fueled equipment.
It shall be the responsibility of the property
owner to secure the services of qualied licensed
professionals for the installation of hard-wired
carbon monoxide detectors.
a. In the event that the side wall
horizontally vented gas fueled equipment
is installed in a crawl space or an attic, the
hard-wired carbon monoxide detector with
alarm and battery back-up may be installed
on the next adjacent oor level.
b. In the event that the requirements of
this subdivision cannot be met at the time of
completion of installation, the owner shall
have a period of thirty (30) days to comply
with the above requirements; provided,
however, that during said thirty (30) day
period, a battery operated carbon monoxide
detector with an alarm shall be installed.
2. APPROVED CARBON MONOXIDE
DETECTORS.
Each carbon monoxide detector as required
in accordance with the above provisions shall
comply with NFPA 720 and be ANSI/UL 2034
listed and IAS certied.
3. SIGNAGE.
A metal or plastic identication plate shall be
permanently mounted to the exterior of the
building at a minimum height of eight (8) feet
above grade directly in line with the exhaust vent
terminal for the horizontally vented gas fueled
heating appliance or equipment. The sign shall
read, in print size no less than one-half (½) inch
in size, “GAS VENT DIRECTLY BELOW.
KEEP CLEAR OF ALL OBSTRUCTIONS”.
4. INSPECTION.
The state or local gas inspector of the side
wall horizontally vented gas fueled equipment
shall not approve the installation unless, upon
inspection, the inspector observes carbon
monoxide detectors and signage installed in
accordance with the provisions of 248 CMR
5.08(2)(a) 1 through 4.
(b) EXEMPTIONS: The following equipment is
exempt from 248 CMR 5.08(2)(a) 1 through 4:
1. The equipment listed in Chapter 10 entitled
“Equipment Not Required To Be Vented” in the
most current edition of NFPA 54 as adopted by
the Board; and
2. Product Approved side wall horizontal vented gas
fueled equipment installed in a room or structure
separate from the dwelling, building or structure
used in whole or in part for residential purposes.
(c) MANUFACTURER REQUIREMENTS –
GAS EQUIPMENT VENTING SYSTEM
PROVIDED. When the manufacturer of
Product Approved side wall horizontally
vented gas equipment provides a venting
system design or venting system components
with the equipment, the instructions provided
by the manufacturer for installation of the
equipment and the venting system shall
include:
1. Detailed instructions for the installation of the
venting system design or the venting system
components; and
2. A complete parts list for the venting system
Page 12
LAARS Heating Systems
design or venting system.
(d) MANUFACTURER REQUIREMENTS –
GAS EQUIPMENT VENTING SYSTEM
NOT PROVIDED. When the manufacturer
of a Product Approved side wall horizontally
vented gas fueled equipment does not
provide the parts for venting the fuel gases,
but identies “special venting systems”, the
following requirements shall be satised by
the manufacturer:
1. The referenced “special venting system”
instructions shall be included with the appliance
or equipment installation instructions; and
2. The “special venting systems” shall be Product
Approved by the Board, and the instructions for
that system shall include a parts list and detailed
installation instructions.
(e) A copy of all installation instructions for all
Product Approved side wall horizontally
vented gas fueled equipment, all venting
instructions, all parts lists for venting
instructions, and/or all venting design
instructions shall remain with the appliance
or equipment at the completion of the
installation.
2.3.2 Side Wall Combustion Air Terminal
The Laars side wall combustion air terminal
(listed in Table 2) must be used when the unit takes
its combustion air through a duct from a side wall.
Consider the following when installing the terminal:
1. Do not locate the air inlet terminal near a source
of corrosive chemical fumes (e.g., cleaning uid,
chlorinated compounds, etc.)
2. Locate the terminal so that it will not be subject
to damage by accident or vandalism.
3. Locate the combustion air terminal so that it
cannot be blocked by snow. The National Fuel
Gas Code requires that it be at least 12 inches (30
cm) above grade, but the installer may determine
it should be higher, depending upon local
conditions.
4. If the Pennant is side-wall vented to the same
wall, locate the vent terminal at least 3 feet
(0.9m) horizontally from the combustion air
terminal, and locate the vent terminal at least 1
foot (0.3m) above the combustion air terminal
(see Figure 3).
2.3.3 Vertical Vent Terminal
When the unit is vented through the roof, the
vent must extend at least 3 feet (0.9m) above the point
at which it penetrates the roof. It must extend at least
2 feet (0.6m) higher than any portion of a building
within a horizontal distance of 10 feet (3.0m), and high
enough above the roof line to prevent blockage from
snow. When the combustion air is taken from the roof,
the combustion air must terminate at least 12" (30cm)
below the vent terminal (see Figure 2).
2.3.4 Vertical Combustion Air Terminal
When combustion air is taken from the roof, a
eld-supplied rain cap or an elbow arrangement must
be used to prevent entry of rain water (see Figure 2).
The opening on the end of the terminal must be at least
12" (30cm) above the point at which it penetrates the
roof, and high enough above the roof line to prevent
blockage from snow. When the vent terminates on the
roof, the combustion air must terminate at least 12"
(30cm) below the vent terminal.
2.4 Common Vent Test — Boilers
When an existing boiler is removed from a
common venting system, the common venting system
is likely to be too large for proper venting of the
appliances remaining connected to it.
At the time of removal of an existing boiler, the
following steps shall be followed with each appliance
remaining connected to the common venting system
placed in operation, while the other appliances
remaining connected to the common venting system
are not in operation.
1. Seal any unused openings in the common venting
system.
2. Visually inspect the venting system for proper
size and horizontal pitch and determine there is
non blockage or restriction, leakage, corrosion
and other deciencies which could cause an
unsafe condition.
3. Insofar as it is practical, close all building doors
and windows and all doors between the space in
which the appliances remaining connected to the
common venting system are located and other
spaces of the building. Turn on clothes dryers
and any appliance not connected to the common
venting system. Turn on any exhaust fans, such
as range hoods and bathroom exhausts, so they
will operate at maximum speed. Do not operate a
summer exhaust fan. Close replace dampers.
4. Place in operation the appliance being
inspected. Follow the lighting instructions.
Adjust thermostat so appliance will operate
continuously.
5. Test for spillage at the draft hood relief opening
after 5 minutes of main burner operation. Use
the ame of a match or candle, or smoke from a
cigarette, cigar or pipe.
6. After it has been determined that each appliance
remaining connected to the common venting
system properly vents when tested as outlined
above, return doors, windows, exhaust fans,
replace dampers and any other gas burning
appliance to their previous conditions of use.
7. Any improper operation of the common venting
system should be corrected so that the installation
Low Temperature Pennant
Page 13
conforms with the National Fuel Gas Code,
ANSI Z223.1/NFPA 54 and/or CSA B149.1,
Natural Gas and Propane Installation Codes.
When resizing any portion of the common
venting system, the common venting system
should be resized to approach the minimum size
as determined using the appropriate tables in
Appendix F in the National Fuel Gas Code, ANSI
Z223.1/NFPA 54 and/or CSA B149.1, Natural
Gas and Propane Installation Codes.
2.4 Véricationdeséventscommuns—
Chaudières
Lorsqu’une chaudière existante est déconnectée
du réseau d’évents commun, ce réseau d’évents
commun devient probablement trop grand pour
les appareils qui lui restent connectés. Lorsqu’une
chaudière existante est retirée, les étapes suivantes
doivent être accomplies pour chaque appareil qui
reste connecté au réseau d’évents commun utilisé,
alors que les autres appareils qui sont encore
connectés au réseau commun d’évents ne sont pas en
fonctionnement.:
1. Sceller toutes les ouvertures non utilisées du
système d'évacuation.
2. Inspecter de façon visuelle le système
d'évacuation pour déterminer la grosseur et
l'inclinaison horizontale qui conviennent et
s'assurer que le système est exempt d'obstruction,
d'étranglement, de fuite, de corrosion et autres
défaillances qui pourraient présenter des risques.
3. Dans la mesure du possible, fermer toutes les
portes et les fenêtres du bâtiment et toutes les
portes entre l'espace où les appareils toujours
raccordés au système d'évacuation sont installés
et les autres espaces du bâtiment. Mettre en
marche les sécheuses, tous les appareils non
raccordés au système d'évacuation common
et tous les ventilateurs d'extraction comme
les hottes de cuisinière et les ventilateurs des
salles de bain. S'assurer que ces ventilateurs
fonctionnent à la vitesse maximale. Ne pas faire
fonctionner les ventilateurs d'été. Fermer les
registres des cheminées.
4. Mettre l'appareil inspecté en marche. Suivre les
instructions d'allumage. Réegler le thermostat de
façon continue.
5. Faire fonctionner le brûleur principal pendant
5 min ensuite, déterminer si le coupe-tirage
déborde à l'ouverture de décharge. Utiliser la
amme d'une allumette ou d'une chandelle ou la
fumée d'une cigarette, d'un cigare ou d'une pipe.
6. Une fois qu'il a été déterminé, selon la méthode
indiquée ci-dessus, que chaque appareil
raccordé au système d'évacuation est mis à l'air
libre de façon adéquate. Remettre les portes
et les fenêtres, les ventilateurs, les registres de
cheminées et les appareils au gaz à leur position
originale.
7. Tout mauvais fonctionnement du système
d'évacuation commun devrait être corrigé
de façon que l'installation soit conforme au
National Fuel Gas Code, ANSI Z223.1/NFPA
54 et (ou) aux codes d'installation CSA-B149.1.
Si la grosseur d'une section du système devrait
être modié, le système devrait être modié pour
respecter les valeurs minimales des tableaux
pertinents de l'appendice F du National Fuel Gas
Code, ANSI Z223.1/NFPA 54 et (ou) les codes
d'installation CSA-B149.1
2.5 Vent Terminals for Outdoor Units
For outdoor applications, the vent and
combustion air openings must be covered with proper
terminals to prevent rain, snow and other objects from
falling into the Pennant.
If local codes allow, outdoor installations may
use 1' (one foot) of appropriately sized galvanized
single wall or type "B" vent and a rain cap for exhaust
vent termination in the default conguration (venting
out of the top). An appropriately sized 90° elbow,
positioned with the opening facing down, may be used
on the combustion air inlet in the default conguration
on the back of the unit. Note that some local codes
may require a higher vertical vent height, extending
above any perimeter fencing, etc. In installations
where the appearance of the vent is objectionable, the
low prole vent terminals listed in Table 6 may be
used.
Part numbers for the low prole terminals to
cover the vent and combustions air openings are
shown in Table 6.
Size Outdoor
Vent
Terminal
500 20254703 D2007900
750 20254705 D2007900
1000 20254705 D2008000
1250 D2007700 D2008000
1500 D2007700 D2008000
1750 D2007800 D2008000
2000 D2007800 D2008200
Table 6. Vent Terminals for Outdoor Units.
Outdoor
Combustion
Air Terminal
Page 14
LAARS Heating Systems
SECTION 3.
Gas Supply and Piping
3.1 Gas Supply and Piping
Gas piping should be supported by suitable
hangers or oor stands, not by the appliance.
The Pennant’s gas train allows the user to pipe
the gas from either the right side or the left side of
the unit. As shipped, the right side of the gas train is
capped off, and there is a manual valve on the left side.
If desired, the manual valve on the left side of the gas
train may be moved to the right side, and the cap on
the right side may be moved to the left.
Review the following instructions before
proceeding with the installation.
1. Verify that the appliance is tted for the proper
type of gas by checking the rating plate. Pennant
appliances are equipped to operate at elevations
up to 10,000 feet (3050m). Pennant appliances
may be adjusted to operate properly at altitudes
above 2500 feet (see Section 6.5.2) and the input
will be reduced if the heating value of the gas
supply is below sea level values.
2. The maximum inlet gas pressure must not
exceed 13" w.c. (3.2kPa). The minimum inlet gas
pressure is 5 in. w.c. (1.2 kPa).
3. Refer to Table 7, size supply.
4. Run gas supply line in accordance with all
applicable codes.
5. Locate and install manual shutoff valves in
accordance with state and local requirements.
6. A sediment trap must be provided upstream of
the gas controls.
7. All threaded joints should be coated with
piping compound resistant to action of liqueed
petroleum gas.
8. The appliance and its individual shutoff valve
must be disconnected from the gas supply piping
during any pressure testing of that system at test
pressures in excess of 0.5 psig (3.45 kpa).
9. The unit must be isolated from the gas supply
system by closing its individual manual shutoff
valve during any pressure testing of the gas
supply piping system at test pressures equal to or
less than 0.5 psig (3.45 kpa).
10. The appliance and its gas connection must be
leak tested before placing it in operation.
11. Purge all air from gas lines.
WARNING
Do not use open flame to check for leaks. An open
flame could lead to explosion, which could result in
property damage, serious injury or death.
AVERTISSEMENT
Ne recherchez pas les fuites avec une flamme nue.
Une flamme nue peut provoquer une explosion qui
peut causer des dommages matériels, de sérieuses
blessures corporelles ou la mort.
NOTE: The Pennant appliance and all other gas
appliances sharing the gas supply line must be firing
at maximum capacity to properly measure the inlet
supply pressure. The pressure can be measured at
the supply pressure port on the gas valve. Low gas
pressure could be an indication of an undersized
gas meter, undersized gas supply lines and/or an
obstructed gas supply line.
Distance from Gas Meter or Last Stage Regulator
Size and
Gas Type 0-100'
500 natural 1½" 3.8 cm 2" 5.1 cm 2" 5.1 cm
500 propane 1" 2.5 cm 1½" 3.8 cm 1½" 3.8 cm
750 natural 2" 5.1 cm 2" 5.1 cm 2½" 6.4 cm
750 propane 1½" 3.8 cm 1½" 3.8 cm 2" 5.1 cm
1000 natural 2" 5.1 cm 2½" 6.4 cm 3" 7.6 cm
1000 propane 1½" 3.8 cm 2" 5.1 cm 2½" 6.4 cm
1250 natural 2½" 6.4 cm 2½" 6.4 cm 3" 7.6 cm
1250 propane 2" 5.1 cm 2" 5.1 cm 2½" 6.4 cm
1500 natural 2½" 6.4 cm 3" 7.6 cm 3" 7.6 cm
1500 propane 2" 5.1 cm 2½" 6.4 cm 2½" 6.4 cm
1750 natural 2½" 6.4 cm 3" 7.6 cm 3" 7.6 cm
1750 propane 2" 5.1 cm 2½" 6.4 cm 2½" 6.4 cm
2000 natural 3" 7.6 cm 3" 7.6 cm 3½" 8.9 cm
2000 propane 2½" 6.4 cm 2½" 6.4 cm 3" 7.6 cm
Notes:
1. These gures are based on 1/2" (0.12 kPa) water column pressure drop.
2. Check supply pressure and local code requirements before proceeding with work.
3. Pipe ttings must be considered when determining gas pipe sizing.
0-31 m 100-200' 31-61m 200-300' 61-91m
Table 7. Gas Piping Size.
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