Brant Radiant Heaters LD Series User manual

LD SERIES
OPERATION, INSTALLATION, MAINTENANCE
AND PARTS MANUAL
FOR YOUR SAFETY!
IF YOU SMELL GAS:
1. Open windows.
2. Do not touch electrical switches.
3. Extinguish any open flame.
4. Immediately call your gas supplier.
Do not store or use gasoline or flammable
vapours and liquids in the vicinity of this or
any other appliance.
SI VOUS SENTEZ UNE ODEUR DE GAZ:
1. Ouvrez les fenêtres.
2. Ne touchez pas aux interrupteurs électriques.
3. Éteignez toute flamme nue.
4. Contactez immédiatement votre compagnie
de gaz.
Il est interdit d’utiliser des liquides inflammables
ou dégageant des vapeurs infammables, à
proximité de tout appariel fonctionnant au gaz.
CONSIGNES DE SÉCURITÉ !
COMMERCIAL, INDUSTRIAL, RESIDENTIAL
TUBE HEATER
Form #LD0307
FOR YOUR SAFETY!
IF YOU SMELL GAS:
1. Open windows.
2. Do not touch electrical switches.
3. Extinguish any open flame.
4. Immediately call your gas supplier.
SI VOUS SENTEZ UNE ODEUR DE GAZ:
1. Ouvrez les fenêtres.
2. Ne touchez pas aux interrupteurs électriques.
3. Éteignez toute flamme nue.
4. Contactez immédiatement votre compagnie
de gaz.
CONSIGNES DE SÉCURITÉ !
WARNING:
If the information in these instructions are not
followed exactly, a fire or explosion may result
causing property damage, personal injury or loss
of life.
Assurez-vous de bien suivre les instructions
données dans cette notice pour réduire au
minimum le risque d’incendle ou d’explosion ou
pour éviter tout dommage matérial, toute blessure
ou la mort.
AVERTISSEMENT:
REVISIONS:
FORWARD STATEMENT - Jan 07
VENT PLACEMENT- pg. 18, Jan 07
½” TYPE I HOSE CONNECTORS- pg. 22Jan 07

WARNING
ANY ALTERATION OF THIS SYSTEM OR OF THE FACTORY-AUTHORIZED
COMPONENTS AS SPECIFIED IN THIS MANUAL OR BY BRANT RADIANT
HEATERS LIMITED VOIDS ALL CERTIFICATIONS AND WARRANTIES.
CAUTION
Approval Standards and Certifications
Brant Radiant Heaters Limited heaters are design
certified by the CSA International and comply
with the National Standards of Canada.
Brant Radiant Heaters Limited
P.O. Box 395, 34 Scott Avenue - Paris, Ontario N3L 3T5 - Telephone: [phone]
Fax: [phone] - Customer Service: 1-800-387-4778
www.brantradiant.com
™Trade-mark of Canadian Standards Association
FORWARD
If the information in these instructions are 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 or 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 neighbor’s 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 the
gas supplier.
INSTALLER
CONSUMER
: Leave this manual with the appliance.
: Retain this manual for future reference.

TABLE OF CONTENTS
1. SAFETY INFORMATION
2. INSTALLATION
2.1 Design Criteria
2.2 Prechecks
2.3 Heater Hanging
2.4 Tube Assembly
2.41 Baffle Assembly
2.5 Reflector Assembly
2.6 Optional Side Shield Installation
2.7 Optional Exchanger “L” or “U” Configuration
2.8 Flue Venting
2.9 Installation for Unvented Operation (Optional)
2.10 Combustion Air Requirements
2.11 Gas Supply
2.12 Allowance for Expansion
2.13 Electrical Requirements
2.14 Thermostat Wiring:
One Two-Stage Thermostat and One LD Series Heater
2.15 Thermostat Wiring:
One Two-Stage Thermostat and Multiple LD Series Heater
2.16 Lighting Instructions
2.17 Shutdown Instructions
3. THEORY OF OPERATION
3.1 LD Models with Micro 60U24 Circuit Control
4. SERVICE
4.1 Maintenance
4.2 Access Panels
4.3 Thermo Limit Switch
4.4 Service
4.5 General Troubleshooting
5. PARTS LIST
5.1 Basic Part List
5.2 Optional Parts
1

1 SAFETY INFORMATION
WARNING
This is not an explosion-proof heater. Where there is the possibility of exposure to flammable vapors, consult
the local fire marshal, the fire insurance carrier or other authorities for approval of the proposed installation.
This infra-red heater is designed for use in industrial and commercial buildings such as warehouses,
manufacturing plants, aircraft hangars, service garages, etc. and residential applications such as garages,
solariums, swimming pools, etc.
Brant Radiant Heaters Limited cannot anticipate every use which may be made of their heaters. Check with
your local gas supplier if you have questions about local regulations.
The following information should be reviewed before installing this heater:
* Check the CSA rating label on the heater to verify the minimum clearances to combustibles and the
proper gas to be used.
* The installation of this heater must conform with local building codes or, in the absence of local codes,
with the current CAN/CSA B149.1 and 2 Codes and with the Canadian Electrical Code C22.1-latest
edition.
* In public garages the heaters must be installed in accordance with the Canadian Electrical Code C22.1-
latest edition when an external electrical source is utilized.
* This is not an explosion-proof heater. Where there is the possibility of exposure to flammable
vapors, consult local fire marshall or other authorities for approval of the proposed installation.
* In aircraft hangars, the heater must be installed at least ten feet (3 m) above the upper surface of wings
or engine enclosures of the highest aircraft which may be stored in the hangar. In areas adjoining the
aircraft storage area, the heaters must not be installed less than eight feet (2.4 m) above the floor. Also, the
heaters must be located to prevent damage to the sections of the aircraft, cranes, scaffolds or other
movable objects.
* Under no circumstances is either the gas supply line or the electrical supply line to the heater to provide
any assistance in the suspension of the heater.
* The weight of the heater must be entirely suspended from a permanent part of the building structure
having adequate load characteristics.
* Neither the gas supply line, electrical supply line nor sprinkler heads shall be located in or near the path
of the flue products from the heater.
* If wind conditions in the space are such that visible swaying of the heater is apparent, the control box
must be rigidly mounted.
* If chlorinated or fluorinated contaminants are present in the area where the heater is installed, then
noncontaminated air for combustion must be ducted to the heater. Sources of contaminants are
refrigerants, solvents, adhesives, paints, degreasers, paint removers, lubricants, pesticides, etc.
* If vaporized solvents are allowed to contact the heater’s HOT exchanger tube, noxious fumes may
result. Chemicals must be properly stored, per manufacturers instructions. Ventilation requirements, as
outlined by local codes, must be maintained.
* Signs should be posted in storage areas to specify maximum stacking height allowed in order to
maintain clearance to combustibles.
2
CAUTION

Failure to comply with the stated clearance to
combustibles could result in personal injury,
death and/or property damage.
This heater should be installed so that the
minimum clearances to vehicles, as marked on
the heater, will be maintained. If vehicles lifts are
present, ensure that these clearances will be
maintained from the highest raised vehicle.
WARNING WARNING
45
45
45
45
48
48
48
48
30
6
10
6
6
6
10
6
6
6
15
8
8
20
11
8
8
16
7
15
58
42
20
11
39
29
16
7
LD(10,15, 20)-40 (N, P)
W/1 SIDE SHIELD
W/2 SIDE SHIELDS
LD(15, 20, 30)-50 (N, P)
W/1 SIDE SHIELD
W/2 SIDE SHIELDS
20 ft or 6.1 m
DOWNSTREAM
OF BURNER
0°
45°
0°
0°
0°
45°
0°
0°
0°
39
21
21
51
28
21
21
41
18
39
148
107
51
28
100
74
41
18
16
26
16
16
16
26
16
16
16
115
115
115
115
122
122
122
122
77
ANGLE DE
MONTAGE
ARRIÈRE AVANT
DESSUS
DESSOUS
CÔTE
MODÈLES
MOUNTING
ANGLE
BEHIND IN FRONT
TOP
BELOW
SIDE
MODEL NO.
UNITS DEGREES
IN.
PCE CM
IN.
PCE CM
IN.
PCE CM
IN.
PCE CM
3
For the safe installation of this heater, the following table contains clearances that must be maintained:
CLEARANCES TO COMBUSTIBLES
AND VECHICLES PARKED BELOW (IN./CM)
TOP
SIDE SIDE
0° MOUNTING ANGLE
SIDE
TOP
FRONT BEHIND
BELOW
45° MOUNTING ANGLE
SIDE
TOP
BELOW
0° W/2 SIDE SHIELDS
TOP
SIDE SIDE
BELOW
0° W/1 SIDE SHIELD
TO CEILING
BR-VCF
12 IN. or 30.5 cm
CLEARANCE
TO WALL OR
COMBUSTIBLES
20 ft or 6.1 m
DOWNSTREAM
& BEYOND
FIRST 20 ft
or 6.1 m
BURNER
MIN. 12 IN.or 30.5 cm
END CLEARANCE
BELOW
Shielded Accessory Exchanger Elbows or “U” Bends do not alter clearances
Unshielded Elbow or “U” Bend Top Clearance is 18” or 45.7 cm
1 SAFETY INFORMATION
NOTE: The LD-10-40 N or P models are
NOT APPROVED FOR RESIDENTIAL USE.

The clearance-to-combustible measurements represent an alcove or clearance box with vertical and horizontal
planes. See figure 1.1.
Example: LD-15-40 clearances as stated at 0° mounting- Top 6” or 16cm
Side 15” or 39cm
Below 45” or 115cm
Note: Combustible material MUST NOT be placed within the confines of the clearance box.
Observe all WARNINGS listed in installation instructions and stated on heater control box.
TOP
90° + Ambient
SIDE
90° + Ambient
SIDE
90° + Ambient
BELOW
90° + Ambient
Figure 1.1
4
15”
39cm
6”
16cm
45”
115cm
15”
39cm
1 SAFETY INFORMATION

Perimeter mounting of these infra-red heaters
provides for the most efficient installation. In figure
2.1.1, the heaters are mounted at the perimeter of the
space to be heated. Refer to the Heater
Installation Chart for the recommended distances on
the models being installed. Buildings that require the
rows of heaters to be farther apart than the
recommended distance in the chart may need
additional heaters placed in the center of the space.
2 INSTALLATION
2.1 Design Criteria
COMMON
VENT
(TYPICAL)
(TYPICAL)
THERMOSTAT
T
HEATER
INFRARED
C
AC
B
TT
TT
Note: This chart is provided as a guideline. Actual conditions may dictate variation from this data.
Figure 2.1.1
TYPICAL BUILDING LAYOUT
HEATER INSTALLATION CHART
MODEL
NO.
TYPICAL
MOUNTING
HEIGHT
DISTANCE
BETWEEN
HEATERS
DIM “A”
DISTANCE
BETWEEN
HEATER ROWS
DIM “B”
MAXIMUM DISTANCE
BETWEEN HEATER
AND WALL
DIM “C”
LD (10, 15, 20) 40 (N, P)
LD (15, 20, 30) 50 (N, P)
FT.
9-16
10-17
FT.
9-26
10-28
FT.
10-50
12-60
FT.
15
16
UNITS
METERS
2.7-4.9
3.0-5.2
METERS
2.7-7.9
3.0-8.5
METERS
3.0-15.2
3.7-18.3
METERS
4.6
4.9
5

When positioning heaters, keep in mind the
clearances to combustible materials, lights, sprinkler
heads, overhead doors, storage areas with stacked
materials, gas and electrical lines, parked vehicles,
cranes and any other possible obstructions or
hazards. Refer to the Warnings, Cautions and the
Clearance-To-Combustibles Chart in the Safety
Information Section and on the heater to verify that a
safe installation condition exists.
The following guidelines must also be met to ensure
a good installation and proper heater performance:
* A maximum of two 45 degree elbows, two 90 degree
elbows or one 180 degree elbow can be installed on
heaters. The gas input of the heaters, as stated on
the rating label, will determine the minimum length
of radiant pipe from the control box to the first elbow.
(See Optional 45, 90 and 180 degree Elbows section
on page 14.)
NOTE: Flue vent requirements do not change when
elbows are installed.
* Do not exceed the maximum vent length of 20 ft./6.1m
for exhausting the heater. Consult Flue Venting,
Section 2.8.
* Do not combine the exhaust vents of two heaters
into a straight-through tee. A Part Number DB-3YA,
or staggered-tee arrangement must be used. Heaters
sharing the same vent must share the
same thermostat. Common vents must have 4 in./
10.2cm Diameter ( see Figure 2.1.1).
* Outside air for combustion must be ducted to the
heater if the building atmosphere where the heater
is installed contains one of the following:
- Chemicals such as chlorinated or fluorinated
hydrocarbons.
- High humidity such as car washes.
- Contaminants such as sawdust, welding
smoke, etc.
- Negative static pressure.
Consult Combustion Air Requirements section on
page 20.
* Do not exceed the maximum air intake duct length of
35 ft./10.7m. Consult Air Intake Duct Chart on page 20.
* Do not draw fresh air to the heater from an attic
space. There is no guarantee that adequate air will
be supplied. Prevailing winds can create negative
or positive pressure in the space.
* All unvented heaters must use a vent with flapper,
Part Number DB-3VCF.
Once all of the safety precautions and design criteria
are met, the actual installation of the heater may begin.
6

7
2 INSTALLATION
2.2 Prechecks
1. Verify that all parts have been received by checking
them against the packing list. If there are questions
regarding the shipment, notify the Re-Verber-Ray
distributor or Brant Radiant Heaters Limited at
Customer Service- 1-800-387-4778.
2. Check the CSA rating label located on the heater’s
control box above the inlet gas supply connection,
to verify the model number, gas input and the gas
to be used.
3. Locate the Clearance-To-Combustibles label
affixed to the heater’s access panel/cover. Using
the heater’s model numbers, as displayed on the
rating label, make sure the finished installation
will conform to the design requirements listed on
the label and the Clearance-To-Combustibles
Chart and the figures shown on page 3.
4. Heaters may discharge the combustion-by-
products directly into the heated space when the
conditions in section 2.9 Installation for Unvented
operation have been met.
EXHAUST
VENT CAP
ALTERNATE EXHAUST
(THROUGH ROOF)
3 IN./7.6cm DIA. VENT PIPE
ALTERNATE AIR INTAKE
(THROUGH ROOF)
CHAIN
SET
CHAIN
SET
REFLECTOR (shown at 30 mounting angle)
GLO-BAR BOX
AIR INTAKE THROUGH WALL
BR-VC INLET VENT CAP
Figure 2.2.1
TYPICAL INSTALLATION DRAWING

"A" DIM
END VIEW
"B" "B"
ENLARGED SIDE VIEW
11 1/8"
4"
16"
"B"
2"
"C"
18"
45.7 cm 81/8"
5"
12.7 cm 10.2 cm 5.1 cm
40.6 cm 28.3 cm
20.6 cm
Figure 2.2.2
8
LD 10
LD 15
LD 20
LD 30
135
195
258
375
2
3
3
4
2
2
2
2
MODEL
NUMBER
DIMENSION
“A” SUSPENSION
POINTS “B”
CONTROL BOX
STABILIZER “C”
IN. M
3.4
5.0
6.6
9.5

2 INSTALLATION
2.3 Heater Hanging
1. The combination tube/reflector suspension
hangers (DB-3HGR), shipped in the parts box
located in the heater control box carton shall be
sufficient to support the heater every 10 feet or 3 m.
Figure 2.3.1
2. Install the heater so that it is independently
supported from the building having adequate load
characteristics. Do not support the heater by the
gas or electrical supply lines.
3. The burner box must be installed so that it is level
and the burner sight glass visible from the floor.
Figure 2.3.2
4. The two hangers supporting the first 10 ft. or 3 m
tube must be installed near the ends of the tube next
to the clamps. It is recommended that the remaining
hangers be installed approximately 10 ft. or 3 m apart.
Figure 2.3.2
5. The suspension chains must be installed so that
they are perpendicular to the heater. When
mounting reflectors at 0 degrees one chain per
hanger is required. When angle mounting the
reflector two chains are required or one chain and
a BR-MAH. Figure 2.3.3
Optional: BR-MAH- An accessory multiple angle
hanger that can be added to preselect the reflector
angle at 15, 30 or 45 degrees.
Optional: BR-CS - An accessory chain set
consisting of 5 ft./1.52m of number 1 double loop
chain and 2 “S” hooks.
6. Close all “S” hooks to ensure maximum load
carrying capacity.
7. If wind conditions in the space are such that
visible swaying of the heater is apparent, the
control box must be rigidly mounted. Threaded
rod can be used to stabilize the control box.
Figure 2.3.3
Figure 2.3.1 Figure 2.3.2
9

2 INSTALLATION
2.4 Tube Assembly
All LD models use highly emissive coated aluminized
titanium steel for combustion tube ( first 10 ft./3.1m).
An aluminized titanium tube is identified by a bright
yellow shipping band. The exchanger tubes are highly
emissive coated aluminized steel.
1. Slide tubes through hangers with welded seam
downwards and locate tube clamp on tube.
2. Mate tubes completely then recheck suspension
hanger locations and secure. Center clamp on
seam and torque clamp bolts to 50 - 60 lbs. - ft.
Figure 2.4.1
3. STOP: Before final assembly of the last radiant
tube verify baffle length, install baffle in the
vertical position and complete final assembly.
See figure 2.4.2 on page 11.
4. Optional: Exchanger configuration 45, 90, 180
degree. Refer to page 14 and 15.
Figure 2.4.1
10

2 INSTALLATION
2 .41 Baffle Assembly
INSTALLATION: BAFFLES MUST BE INSTALLED ACCORDING TO MANUFACTURERS INSTRUCTIONS TO
ENSURE THE HEATERS SAVE AND EFFICIENT OPERATION.
LS, LD, LSA, & LDA models use one section of heat transfer baffle and two sections of pressure baffle. The pressure baffle
utilizes restrictor tabs that incorporate a factory set angle to optimize heater performance. Baffles must be installed as per
diagram.
When a 45° , 90° elbow, or 180° “U” bend is used to alter the radiant tubing the heat transfer baffle (baffle without ears)
must be removed from the baffle configuration. Install the two pressure baffles (baffles with ears).
NOTE: The position of the tabs relevant to heater airflow.
- The two pressure baffles must be the last two baffles installed in tube.
- The tabs on pressure baffle must be alternated in assembly for proper performance.
- Refer to drawings for baffle assembly.
Figure 2.4.2
11

4. Install clips in their “A” position as shown in
Figure 2.5.3 on the first and last suspension
hanger. Clips are located right side front and left
side back of the wire suspension hanger.
5. Optional: Side Shield Installation refer to page 13.
Figure 2.5.3
Figure 2.5.1 Figure 2.5.2
12
2 INSTALLATION
2.5 Reflector Assembly
1. Install reflector intermittent support DB-IH as
shown in figure 2.5.1
2. Slide reflectors through wire suspension hangers
and adjust the reflector positioning spring in the
V-groove on top of the reflector. Figure 2.5.2
3. Overlap reflectors 4 inches/10.2cm for support and
secure together with supplied clips or sheet metal
screws. Make sure to leave an expansion joint as
shown in Figure 2.5.3.

13
2 INSTALLATION
2.6 OPTIONAL
Side Shield Installation
1. Install side shields as per figure 2.6.1. The clearance to
combustibles will be altered when side shields are installed.
Refer to safety information on page 3.
Figure 2.6.1

2 INSTALLATION
2.7 OPTIONAL
Exchanger “L” or “U” Configuration
A maximum of two 45, 90 degree “L” or one 180
degree “U” bend may be installed to alter the
standard radiant tube configuration (see Figure 2.7.1).
See the Baffle Specification Chart on page 15 for the
minimum distance requirements, listed by model
number from the burner control box to an elbow or
“U”.
DB-45-E consists of a 45 degree 16 Ga. Swaged
elbow, tube clamp and one suspension
hanger.
DB-3EA consists of a 90 degree 16 Ga. Swaged
elbow, tube clamp, two piece reflector
and one suspension hanger.
DB-3UA consists of a 180 degree 16 Ga. Swaged
“U”, tube clamp, three piece reflector,
one suspension hanger and one reflector
support.
Figure 2.7.2 Hanging Points
Figure 2.7.3 “U” Dimensions
Figure 2.7.4 Spreader Bar (optional)
Figure 2.7.5 Spreader Bar (optional)
IMPORTANT
Baffle lengths may be altered with the addition of
elbows or “U” assembly. See BAFFLE
SPECIFICATION CHART on page 15 for baffle
lengths listed by model number.
When utilizing a “U” or “L” bend the exhaust/return
leg must be equal to or higher than the burner control
box. Reflector runs from burner control to elbow or
“U” will require an expansion joint. See page 15.
Figure 2.7.1
Figure 2.7.2
Figure 2.7.4
Figure 2.7.3
14

LD-10-40 (N, P)
LD-15-40 (N, P)
LD-20-40 (N, P)
LD-15-50 (N, P)
LD-20-50 (N, P)
LD-30-50 (N, P)
1
1
1
1
1
1
2
2
2
2
2
2
0
0
0
0
0
0
10’
10’
10’
10’
10’
10’
MODEL
NUMBER
STANDARD
BAFFLE SECTIONS
180 DEGREE
“U”
BAFFLE SECTIONS
45, 90 DEGREE
“L”
BAFFLE SECTIONS
MIN. DISTANCE
FROM BURNER
TO AN ELBOW
OR U FITTING
BAFFLE SPECIFICATION CHART
15
3.0m
3.0m
3.0m
3.0m
3.0m
3.0m
ONE BAFFLE SECTION IS APPROX. 33”/83.8cm.
HT - Heat Transfer Baffle
P - Pressure Baffle
Figure 2.7.5
HT BAFFLE
FIRST
P BAFFLE
SECOND
2
2
2
2
2
2
P BAFFLE
SECOND
HT BAFFLE
FIRST HT BAFFLE
FIRST
P BAFFLE
SECOND
2
2
2
2
2
2
0
0
0
0
0
0

2 INSTALLATION
2.8 Flue Venting
The following guidelines must be observed to ensure
proper system performance and safety:
* Check all applicable codes prior to installing flue
stacks. Local codes may vary.
* The heater is designed to operate with a 3-in./7.6cm
diameter 26 ga. minimum exhaust stack.
* Single-wall galvanized flue pipe or Dura/Connect
single wall, flexible connectors must be used. The
portion of the flue pipe which goes through
combustible material in the building wall or roof
must pass through a type “B” vent to maintain
clearance (see figure 2.8.1 through 2.8.2).
* Maximum vent length for all models is 20 ft./6.1m
including two 90 degree elbows.
* The bottom of the vent terminal shall be
located at least 7 ft./2.13m above grade.
* Uninsulated single-wall metal pipe shall not be
used in cold climates for venting gas utilization
equipment.
* The vent terminal of a horizontal venting system
must be installed to prevent blockage by snow and
protect building materials from degradation by
flue gases.
* Vertical venting should be a minimum of 24 inches
/61cm above the roof in an area that prevents snow
blockage. See Figure 2.8.1
* Horizontal venting must maintain a minimum
distance from the vent termination to the sidewall.
See Figure 2.8.2
* Buildings incorporating vented soffits/overhangs
must ensure that the products-of-combustion do
not enter the attic space.
* A common flue of 4 in./10.2cm diameter must be used
for double-venting of units. One thermostat must
control both units. When common venting is
used, flues should be connected so that the by-
products of one heater cannot flow into the
adjoining flue of the other heater. A dual-exhaust
assembly is available from Brant Radiant Heaters,
Part Number DB-3YA (see Figures 2.8.4and 2.8.5). A
Duravent DB-3VK vent kit must be used for sidewall
venting LD models.
16
Figure 2.8.2
Figure 2.8.1

* Vertical venting may utilize standard “B” vent
caps.
* All vent pipes must be sealed with high
temperature sealant and 4 No. 8 sheet metal
screws to prevent leakage of flue gas into building.
* Horizontal flues should be pitched down toward
outlet, ¼ in./.64cm per ft. of vent length, to
prevent rain from entering the heater
(see Figure 2.8.3). Do not pitch heater.
Figure 2.8.3
Figure 2.8.5
Figure 2.8.4
DUAL-EXHAUST ASSEMBLY
(THROUGH ROOF)
DUAL-EXHAUST ASSEMBLY
(THROUGH WALL)
17

12 inches (30 cm)
B= Clearance to window or door that may
be opened
12 inches (30 cm)
A= Clearance above grade, veranda,
porch, deck or balcony
6 inches(15 cm for appliances < , 10,000
Btuh (3 kW), 12 inches (30cm) for
appliances > 10,000 Btuh (3 kW) and <
100,000 Btuh (30 kW), 36 inches (91cm)
for appliances > 100,000 Btuh (30 kW)
6 inches(15 cm for appliances <, 10,000
Btuh (3 kW), 9 inches (23cm) for
appliances > 10,000 Btuh (3 kW) and <
50,000 Btuh (15 kW), 12 inches (30 cm)
for appliances > 50,000 Btuh (15 kW)
C= Clearance to permanently closed
window
D= Vertical clearance to ventilated soffit
located above the terminal within a
horizontal distance of 2 feet (61cm)
from the center line of the terminal
E= Clearance to unventilated soffit
F= Clearance to outside corner
G= Clearance to inside corner
H= Clearance to each side of center line
extended above meter/regulator
assembly
I= Clearance to service regulator vent
outlet
J= Clearance to nonmechanical air supply
inlet to building or the combustion air
inlet for any other appliance
K= Clearance to a mechanical air supply
inlet
L= Clearance above paved sidewalk or
paved driveway located on public
property
M= Clearance under veranda, porch, deck
or balcony
*
*
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3 feet (91cm) within a height 15 feet
(4.5 m) above the meter/regulator
assembly
3 feet (91cm)
6 inches(15 cm for appliances <, 10,000
Btuh (3 kW), 12 inches (30cm) for
appliances > 10,000 Btuh (3 kW) and <
100,000 Btuh (30 kW), 36 inches (91cm)
for appliances > 100,000 Btuh (30 kW)
6 inches(15 cm for appliances <, 10,000
Btuh (3 kW), 9 inches (23cm) for
appliances > 10,000 Btuh (3 kW) and <
50,000 Btuh (15 kW), 12 inches (30 cm)
for appliances > 50,000 Btuh (15 kW)
6 feet (1.83 m)
7 feet (2.13 m)
12 inches (30 cm)
3 feet (91 cm) if within 10 feet (3 m)
horizontally
Canadian Installations 1US Installations 2
1 In accordance with the current CSA 8149.1 Natural Gas and Propane Installation Code
2 In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code
A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings
and serves both dwellings.
Permitted only if veranda, porch, deck or balcony is fully open on a minimum of two sides beneath the floor
For clearances not specified in ANSI Z223.1/NFPA or CSA B149.1, one of the following shall be indicated:
a) A minimum clearance value determined by testing in accordance with section 4.7.3, 6.5.5, 8.5.5, or;
b) A reference to the following footnote: “Clearance in accordance with local installation codes and the requirements of the gas
supplier.”
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2 INSTALLATION
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