INSTALLATION AND
OPERATION MANUAL
TM
Gas-Fired Pool
and Spa Heater
Atmospheric Models 268 and 408
WARNING: If these instructions are not followed exactly, a re or explosion may result causing property
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damage, personal injury or death.
FOR YOUR SAFETY: Do not store or use gasoline or other flammable vapors and liquids or other combustible materials in the vicinity of this or any other appliance. To do so may result in an explosion or
fire.
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.
This manual should be maintained in legible condition and kept adjacent to the heater or in a safe place for future
reference.
Catalog No. 6000.64B Eective: 07-15-18 Replaces: 11-15-17 P/N 241452 Rev. 3
Revision 3 reects the following changes:
Manual updated to the new format style. Removed California Proposition 65 warning.
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CONTENTS
1. WARNINGS ................................................................... 4
1.1. Pay Attention to These Terms ..............................4
2. WATER CHEMISTRY ................................................... 5
2.1. Automatic Chlorinators and Chemical
Feeders .......................................................................5
3. OPERATING INSTRUCTIONS .................................... 6
3.1. Start-Up Procedures ............................................... 6
3.2. Before Start-Up .........................................................6
3.3. Visual inspection ......................................................6
3.4. Caution ........................................................................6
3.5. Maintenance .............................................................8
3.6. Cold Weather Operation ........................................8
4. BEFORE INSTALLATION ............................................ 9
4.1. Receiving equipment .............................................. 9
4.2. Rating and certications .......................................9
4.3. Ambient Temperature Rating of Heater
Components .............................................................. 9
4.4. Atmospheric heaters ..............................................9
5. INSTALLATION ............................................................. 9
5.1. Installation Codes .................................................... 9
5.2. Clearances .............................................................. 10
5.3. Outdoor Heater Installation ............................... 11
5.4. Combustion and Ventilation Air ....................... 12
5.5. Vent Piping .............................................................. 15
5.6. Gas Supply Connections .................................... 16
5.7. Water Connection Installation .......................... 18
5.8. Unitherm Governor Operation .......................... 18
5.9. Internal Automatic Bypass Valve ..................... 18
5.10. External Auxiliary Bypass Valve ........................ 19
5.11. Auxiliary Bypass Valve Adjustment ................. 19
5.12. Pressure Relief Valve Installation .................... 19
5.13. Plumbing.................................................................. 19
6. ELECTRICAL WIRING ...............................................20
6.1. Electrical Power Draw ......................................... 20
6.2. Transformer Wiring .............................................. 21
7. WIRING DIAGRAM ....................................................23
8. CONTROLS..................................................................24
8.1. Control Panel Removal ........................................ 24
8.2. Control Adjustments ............................................ 24
8.3. Operation ................................................................. 24
8.4. Status and Diagnostics ....................................... 26
8.5. Remote Control Wiring ........................................ 28
9. REPLACEMENT PARTS ............................................32
10. TROUBLESHOOTING ...............................................33
10.1. Mechanical ............................................................. 33
10.2. Control Logic - Flow Chart ................................. 34
11. ILLUSTRATED PARTS LIST......................................35
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1. WARNINGS
1.1. Pay Attention to These Terms
DANGER
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WARNING
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CAUTION
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CAUTION
NOTE
DANGER: Failure to install the drafthood on indoor
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installation and properly vent the heater to the outdoors
as outlined in the venting section of this manual can
result in unsafe operation of the heater. To avoid the risk
of re, explosion, or asphyxiation from carbon monoxide,
never operate this heater unless it is properly vented
and has an adequate air supply for proper operation. Be
sure to inspect the vent system for proper installation at
initial start-up, and at least annually thereafter. Refer to
the venting section of this manual for more information
regarding vent system inspections.
WARNING: To minimize the possibility of improper
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operation, serious personal injury, re, or damage to the
heater:
• Always keep the area around the heater free of
combustible materials, gasoline, and other ammable
liquids and vapors.
• Heater should never be covered or have any blockage
to the ow of fresh air to the heater.
WARNING: This unit contains refractory ceramic
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ber (RCF) insulation in the combustion chamber. RCF,
as manufactured, does not contain respirable crystalline
silica. However, following sustained exposure to very
high temperatures [>2192°F (1200°C)], the RCF can
transform into crystalline silica (cristabolite). The
International Agency for Research on Cancer (IARC) has
classied the inhalation of crystalline silica (cristabolite)
as carcinogenic to humans.
When removing the burners or heat exchangers, take
precautions to avoid creating airborne dust and avoid
inhaling airborne bers. When cleaning spills, use wet
sweeping or High Eciency Particulate Air (HEPA)
ltered vacuum to minimize airborne dust. Use feasible
engineering controls such as local exhaust ventilation or
dust collecting systems to minimize airborne dust. Wear
appropriate personal protective equipment including
gloves, safety glasses with side shields, and appropriate
NIOSH certied respiratory protection, to avoid inhalation
of airborne dust and airborne ber particles.
Indicates the presence of immediate hazards which will cause severe personal injury, death or
substantial property damage if ignored.
Indicates the presence of hazards or unsafe practices which could cause severe personal injury,
death or substantial property damage if ignored.
Indicates the presence of hazards or unsafe practices which could cause minor personal injury
or product or property damage if ignored.
CAUTION used without the warning alert symbol indicates a potentially hazardous condition
which could cause minor personal injury or product or property damage if ignored.
Indicates special instructions on installation, operation, or maintenance which are important but
not related to personal injury hazards.
WARNING: Improper installation, adjustment,
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alteration, service, or maintenance can cause property
damage, personal injury or loss of life. Installation and
service must be performed by a qualied installer, service
agency, or the gas supplier.
WARNING: Gasoline, as well as other ammable
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materials and liquids (adhesives, solvents, etc.), and
the vapors they produce, are extremely dangerous. Do
not handle, use, or store gasoline or other ammable or
combustible materials in the vicinity of a heater.
WARNING: Both natural gas and propane have an
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odorant added to aid in detecting a gas leak. Some people
may not physically be able to smell or recognize this
odorant. If you are unsure or unfamiliar with the smell
of natural gas or propane, ask your local gas supplier.
Other conditions, such as “odorant fade,” which causes
the odorant to diminish in intensity, can also hide,
camouage, or otherwise make detecting a gas leak by
smell more dicult.
WARNING: UL-recognized fuel gas detectors are
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recommended in all enclosed propane and natural gas
applications wherein there is a potential for an explosive
mixture of fuel gas to accumulate and their installation
should be in accordance with the detector manufacturer’s
recommendations and/or local laws, rules, regulations,
or customs.
WARNING: Do not install within 3 feet (0.9 m) of a heat
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pump or an outdoor condensing unit. Strong air intake
from this type of equipment can disturb the combustion
process and cause damage or personal injury.
WARNING: The heater shall not be located in an area
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where water sprinklers, or other devices, may cause water
to spray through the cabinet louvers and into the heater.
This could cause internal rusting or damage electrical
components, and void the warranty.
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2. WATER CHEMISTRY
NOTE: Corrosive water voids all warranties.
Chemical imbalance can cause severe damage to your
heater and associated equipment. Maintain your water
chemistry according to Table A. If the mineral content
and dissolved solids in the water become too high, scale
forms inside the heat exchanger tubes, reducing heater
eciency and damaging the heater. If the pH drops below
7.2, this will cause corrosion of the heat exchanger and
severely damage the heater. Heat exchanger damage
resulting from chemical imbalance is not covered by
the warranty.
For your health and the protection of your pool equipment,
it is essential that your water be chemically balanced. The
following levels must be used as a guide for balanced
water.
CAUTION: Free chlorine must not exceed 5 ppm which
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can damage the heater and is not covered under warranty.
• Automatic chemical dosing devices and salt
chlorinators are usually more efficient in heated
water, unless controlled, they can lead to excessive
chlorine level which can damage your heater.
• Further advice should be obtained from your pool
or spa builder, accredited pool shop, or chemical
supplier for the correct levels for your water.
2.1. Automatic Chlorinators
and Chemical Feeders
All chemicals must be introduced and completely diluted
into the pool or spa water before being circulated through
the heater. Do not place sanitizing chemicals in the
skimmer. High chemical concentrations will result when
the pump is not running (e.g. overnight).
Chlorinators must feed downstream of the heater and
have an anti-siphoning device to prevent chemical backup
into the heater when the pump is shut o.
See plumbing diagrams on Figure 29 and Figure 30.
• Occasional chemical shock dosing of the pool or
spa water should not damage the heater providing
the water is balanced.
Recommended Level(s) Fiberglass Pools Fiberglass Spas Other Pool and Spa Types
Water Temperature 68-88°F (20-31°C) 89-104°F (31-40°C) 68-104°F (20-40°C)
pH 7.3-7.4 7.3-7.4 7.6-7.8
Total Alkalinity (ppm) 120-150 120-150 80-120
Calcium Hardness (ppm) 200-300 150-200 200-400
Salt (ppm) 4500 Maximum 4500 Maximum 4500 Maximum
Free Chlorine (ppm)* 2-3 2-3 2-3
Total Dissolved Solids (ppm) 3000 Maximum** 3000 Maximum** 3000 Maximum**
*Free Chlorine MUST NOT EXCEED 5 ppm!
**In saltwater chlorinated pools, the total TDS can be as high as 6000 ppm.
Table A. Pool Water Chemistry
NOTE: High chemical concentrates from feeders and
chlorinators that are out of adjustment will cause rapid
corrosion to the heat exchanger. Such damage is not
covered under the warranty.
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3. OPERATING INSTRUCTIONS
3.3. Visual inspection
3.1. Start-Up Procedures
Your pool/spa heater has been designed for years of safe
and reliable pool/spa water heating. It is available with
electronic ignition. This manual provides installation,
operation, maintenance, and service information for these
heaters.
Temp Adjust Buttons
Mode Button
TEMP
LCD Display
Figure 1. Heater Control Toggle Switch
ON
MODE
OFF
If your heater has been installed correctly, operating the
heater is an easy task. The upper front panel of the heater
contains the control center that allows you to turn the
heater On or O and adjust the temperature settings for
the pool or spa. The temperature range is factory set from
65°F (18°C) to 104°F (40°C). See Figure 1 for location of
toggle switch to turn the heater On and O.
See Section 8 for additional details about the use of the
controls in the Control Adjustments subsection.
3.2. Before Start-Up
3.2.1. Burners
Clean main burners and air louvers of dust, lint and debris.
Keep heater area clear and free from combustibles,
ammable liquids and chemicals. Do not obstruct the
ow of combustion and ventilation air.
3.2.2. Water
Water must be owing through the heater during
operation. Ensure that the system is lled with water and
that the pump is operating.
3.3.1. Atmospheric Heaters
With the heater on, remove the door and make a visual
check of the pilot and burner. The ame should be blue
with a well-dened pattern.
A yellow or “oating” ame indicates restricted air
openings or incorrect orice size. Should this occur, shut
the heater o and contact your installer or gas supplier.
WARNING: Operation of the heater without water
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circulation will cause rapid and severe damage to the
heater, and will void the warranty.
3.4. Caution
Elevated water temperature can be hazardous. The
U.S. Consumer Product Safety Commission has these
guidelines:
1. Spa water temperatures should never exceed 104°F
(40°C). A temperature of 100°F (38°C) is considered
safe for a healthy adult. Special caution is suggested
for young children.
2. Drinking of alcoholic beverages before or during spa
or hot tub use can cause drowsiness which could
lead to unconsciousness and subsequently result in
drowning.
3. Pregnant Women Beware! Soaking in water over
102°F (39°C) can cause fetal damage during the first
three months of pregnancy resulting in the birth of a
brain-damaged or deformed child. Pregnant women
should stick to the 100°F (38°C) maximum rule.
4. Before entering the spa or hot tub, users should
check the water temperature with an accurate
thermometer; spa or hot tub thermostats may err
in regulating water temperatures by as much as 4°F
(2.2°C).
5. Persons with a medical history of heart disease,
circulatory problems, diabetes, or blood pressure
problems should obtain a physician’s advice before
using pools or hot tubs.
6. Persons taking medications which induce
drowsiness, such as tranquilizers, antihistamines, or
anticoagulants, should not use spas or hot tubs.
3.2.3. After Start-Up
Feel the inlet and outlet pipes. Outlet pipe should be only
slightly warmer than the inlet. It should not be hot.
WARNING: Should overheating occur or the gas
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supply fail to shut o, turn o the manual gas control to
the appliance.
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CAUTION: Propane gas is heavier than air and will settle on the ground. Since propane can accumulate in conned
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areas, extra care should be exercised when lighting propane heaters.
OPERATING INSTRUCTIONS AND SHUT-OFF PROCEDURES
ELECTRONIC IGNITION SYSTEM
(AUTOMATICALLY LIGHTED PILOT)
A. This appliance is equipped with an ignition
device which automatically lights the pilot. Do
not try to light the pilot by hand.
B. BEFORE OPERATING, smell all around the
appliance area for gas. Be sure to smell near
the oor because some gas is heavier than
air and will settle on the oor.
WHAT TO DO IF YOU SMELL GAS:
*Do not try to light any appliance.
*Do not touch any electric 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.
OPERATING INSTRUCTIONS
1. STOP! Read the safety information above.
2. Set the thermostat to the lowest setting.
3. Turn off all electrical power to the appliance.
4. This appliance is equipped with an ignition
device which automatically lights the pilot. Do
not try to light the pilot by hand.
5. Remove heater door panel.
6. Turn gas control knob clockwise to
“Off”. (Honeywell VR 8300 and Robertshaw
7000)
7. Wait 5 minutes to clear out any gas. If you
then smell gas, STOP! Follow “B in the safety
information above. If you don’t smell gas, go
to the next step.
8. Turn gas control knob counter-clockwise
to “On”. (Honeywell VR 8300 and Robertshaw
7000)
9. Replace heater door panel.
10. Turn on all electrical power to the appliance.
11. Set thermostat to desired setting.
12. If the appliance will not operate, follow the
instructions “To Turn Off Gas To Appliance”
and call your service technician or gas
supplier.
*If you cannot reach your gas supplier, call the
re department.
C. Use only your hand to push in or turn the gas
control knob. Never use tools. If the knob
will not push in or turn by hand, do not try to
repair it. Call a qualied service technician.
Force or attempted repair may result in a re
or explosion.
D. Do not use this appliance if any part has been
under water. Immediately call a qualied
service technician to inspect the appliance
and to replace any part of the control system
and any gas control which has been under
water.
HONEYWELL
VR 8300 GAS
VALVE IID
GAS
INLET
ROBERTSHAW 7000
GAS VALVE IID
1. Set the thermostat at the lowest setting.
2. Turn off all the electrical power to the appliance if service is to be performed.
3. Remove heater door panel.
SHUT-OFF PROCEDURES
4. For Honeywell VR 8300 and Robertshaw
7000 gas valve.
Turn gas control knob clockwise
to “Off”. Make sure knob rest against stop.
5. Replace heater door panel.
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3.5. Maintenance
DRAIN
WARNING: Check the heater for possible rodent nests
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after long periods of non-use.
To be followed one month after start-up and then semiannually.
1. Inspect top of heater and drafthood for soot, a
sticky black substance around finned tubes and “V”
baffles, and open flue gas passageways. Any visible
soot should be cleaned for proper operation.
CAUTION: Soot may be combustible. Wet sooted
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surfaces completely prior to cleaning. Do not use steel
wire brush.
2. Clean main burners and pilot burner of dust and lint.
3. Inspect and operate all controls, gas valve and
pressure relief valve (if equipped).
4. Make visual check of the burner and pilot flames.
Yellow flame means restriction of the air openings.
Lifting or blowing flame indicates high gas pressure.
Low flame means low gas pressure. Should the
latter occur, shut the heater off and contact your gas
supplier or qualified service agency.
5. On indoor heaters, clean room intake openings to
ensure adequate flow of combustion and ventilation
air.
CAUTION: Combustion air must not be contaminated
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by corrosive chemical fumes which can damage the
heater and void the warranty.
6. Keep area around heater clear and free from
combustible materials, gasoline and other flammable
and corrosive vapors and liquids.
If Heater Will Not Fire:
If you have no electrical power, it may be that your “circuit
breaker” has tripped. Try re-setting it.
If you have electrical power but the heater will not re
check the following or see Troubleshooting section:
1. The time clock must be in the “ON” position.
2. Your pump strainer basket may be full. If so remove
debris.
3. Your filter may be dirty. If so, backwash or clean
filter. (To tell if your filter is dirty, look to see if the
filter pressure will be higher than usual).
4. The pump may have lost its prime and be running
dry. Check the pressure on the filter. If there is no
pressure; then you are not moving water (or your
gauge is broken). Try to get the pump to run at its
normal flow rate.
5. Check flow switch operation and paddles (“F” paddle
on 268 or “A” paddle on 408).
3.6. Cold Weather Operation
3.6.1. Important Freeze Information
MODERATE CLIMATE: Heater operation can continue
during short-term cold spells. When temperatures are
between 0° (-17°C) and 32°F (0°C), ow (continuous pump
operation) must be maintained.
CAUTION: Do not use the heater to maintain water
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temperatures just above freezing or for freeze protection.
When heater is used during freezing weather, care must
be taken to avoid freeze-ups. Continuous pump operation
is a must. Additional protection may be required. The
heater is not warranted against freeze-ups.
COLD CLIMATE: Prolonged operation with water
temperatures below 50°F (10°C) is not recommended.
When starting the heater with water temperatures below
50°F (10°C), operate the heater continuously until higher
temperatures are reached. Operating the heater for
prolonged periods with pool water below 50°F (10°C)
can seriously damage the heater, and is not covered by
the warranty. For cold climate areas, please follow the
winterizing procedures listed.
3.6.2. Winterizing the Pool and Spa
Heater
Heaters installed outdoors in freezing climate areas
may be shut down for the winter. Observe the following
procedure for winterizing the heater:
1. Turn off gas valve, manual gas valve, and electrical
supply to the heater.
2. Open drain valve located on the inlet/outlet header,
(under water pipes). Remove the heat exchanger
inspection panel on the side opposite water piping
to gain access to the drain plug on the return header.
Open drain plug on return header.
Figure 2. Return Header Drain Valve
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4. BEFORE INSTALLATION
Rating Plate
4.1. Receiving equipment
The manufacturer recommends that this manual be
reviewed thoroughly before installing the pool/spa heater.
If there are any questions that this manual does not answer,
please contact the factory or your local representative.
On receipt of your equipment it is suggested that you
visually check for external damage to the carton. If the
carton is damaged, a note should be made on the Bill
of Lading when signing for the equipment. Remove the
heater from the carton. If it is damaged, report the damage
to the carrier immediately. Save the carton.
These items are shipped inside a box in the carton with
the heater:
1. “Pagoda” top
2. In/Out flanges (2)
3. 2" CPVC female tailpiece, ring nut and O-ring
4. 2" flange gaskets (2)
5. Flange bolts (4)
6. Pressure relief valve
7. 2" CPVC adapter
8. Plastic pipe finish flange for gas line
9. Bonding lug with mounting screw
10. 2" CPVC manifold adapter
11. Prewired 1" flow switch with outdoor cover
12. Temperature and pressure gauge
The Model and Serial No.
can also be found inside
the bezel above the display
Alternate
location
Be sure that you receive the number of packages indicated
on the Bill of Lading.
When ordering parts, you must specify the model and
serial numbers of the heater. See below for location of
serial number. When ordering under warranty conditions,
you must also specify date of installation.
4.2. Rating and certications
These heaters are design-certied and tested under the
latest requirements of the ANSI Z21.56 / CSA 4.7 Standard
for Gas-Fired Pool Heaters. All heaters can be used either
indoor or outdoors. The appropriate top designated for
each type of use is required. If necessary, the top can be
changed at a later date to change from outdoor to indoor
or vice versa.
All units have heat exchangers which are ASME-certied
(BPV Section IV part HLW) and are registered with
National Board.
4.3. Ambient Temperature Rating
of Heater Components
Electronic Ignition Heater* -32°F to + 175°F (-36°C to 79°C)
*Requires 120 or 240VAC Power Supply
4.4. Atmospheric heaters
Rated inputs are suitable for up to 2,000 ft (610 m)
elevation. For elevations above 2,000 ft (610 m), reduce
input 4% for each 1,000 ft (305 m) above sea level, as high
elevation reduces combustion performance.
5. INSTALLATION
5.1. Installation Codes
Installation must be in accordance with local codes, or,
in the absence of local codes, with the latest edition of
the National Fuel Gas Code, ANSI Z223.1/NFPA54 and
National Electrical Code, ANSI/NFPA 70, and for Canada,
the latest edition of CAN/CSA-B149 Installation Codes,
and Canadian Electrical Code, CSA C22.1 Part 1 and
Part2.
Model and Serial No.
located on Rating Plate
Figure 3. Rating Plate Location
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5.2. Clearances
5.2.1. All Heaters
For indoor and outdoors clearances from combustible
surfaces, see the chart below.
Location Indoor Installation
Top * 30" (762 mm) Drafthood
Front Alcove (Open)
Vent 6" (152 mm)
Floor ** 0"
Back 6" (152 mm)
Right Side 12" (305 mm) Water Side
Left Side 6" (152 mm) Opposite Water Side
Location Outdoor Installation
Top * Unobstructed (Outdoor Stack)
Top *** 36" (76 mm) (Stackless Top)
Right Side 12" (305 mm) Water Side
Left Side 6" (152 mm)
Floor 0"
Back 6" (152 mm)
* Clearance from top of vent terminal
** Do not install on carpeting
*** Clearance from top of heater
Table B. Minimum Clearances from Combustible Installations
4' (1.2 m)
Minimum
4' (1.2 m)
Minimum
4' (1.2 m)
Minimum
3' (0.9 m)
Minimum
10' (3 m)
Minimum
Forced Air Inlet
Figure 4. Minimum Distances to Building Openings from
Where Flue Products Exit the Boiler
1' (0.3 m)
Minimum
Description Location
Distance
in. (mm)
Back 9 (229)
a. 3-1/2" (89 mm) thick
masonry walls without
ventilated air space
Right 9 (229)
Left 9 (229)
Vent 5 (127)
Indoor Top 39 (991)
Outdoor Top Unobstructed
Back 6 (152)
b. 1/2" (13 mm)insulation
board over 1" (25 mm)
glass ber or mineral
wool batts
Right 6 (152)
Left 6 (152)
Vent 3 (76)
Indoor Top 30 (762)
Outdoor Top Unobstructed
c. 0.024 sheet metal over
1" (25 mm) glass ber
or mineral wool batts
reinforced with wire on
rear face with ventilated
air space
Back 4 (102)
Right 4 (102)
Left 4 (102)
Vent 3 (76)
Indoor Top 24 (610)
Outdoor Top Unobstructed
Back 6 (152)
d. 3-1/2" (89 mm) thick
masonry wall with
ventilated air space
Right 6 (152)
Left 6 (152)
Vent 6 (152)
Indoor Top 39 (991)
Outdoor Top Unobstructed
Back 4 (102)
Right 4 (102)
e. 0.024 sheet metal with
ventilated air space
Left 4 (102)
Vent 2 (51)
Indoor Top 24 (610)
Outdoor Top Unobstructed
Back 4 (102)
f. 1/2" (13 mm) thick
insulation board with
ventilated air space
Right 4 (102)
Left 4 (102)
Vent 3 (76)
Indoor Top 24 (610)
Outdoor Top Unobstructed
Back 4 (102)
g. 0.024 sheet metal with
ventilated air space over
0.024 sheet metal with
ventilated air space.
Right 4 (102)
Left 4 (102)
Vent 3 (76)
Indoor Top 24 (610)
Outdoor Top Unobstructed
h. 1" (25 mm) glass ber
or mineral wool batts
sandwiched between
two sheets 0.024 sheet
metal with ventilated air
space
Derived from National Fuel Gas Code, Table 10.2.3
Back 4 (102)
Right 4 (102)
Left 4 (102)
Vent 3 (76)
Indoor Top 24 (610)
Outdoor Top Unobstructed
Table C. Reduction of Clearances to Protected Surfaces
When installed according to the listed minimum clearances
from combustible construction, the pool heater can still
be serviced without removing permanent construction
around the heater.
However for ease of servicing, we recommend a clearance
of at least 24" (610 mm) in the front, and at least 18" (457
mm) on the water connection side.
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This will enable the heater to be serviced in its installed
PAGODA TOP
location, that is, without movement or removal of the heater.
Clearances less than these (6" [152 mm] minimum), may
require removal of the heater to service either the heat
exchanger or the burner tray. In either case, the heater
must be installed in a manner that will enable the heater
to be serviced without removing any structure around the
heater.
5.2.2. Flooring
This heater can be installed on combustible ooring.
The combustible clearances listed can be reduced by
protecting the exposed combustible surfaces as shown in
Table C.
5.3. Outdoor Heater Installation
These heaters are design-certied for outdoor installation,
when equipped with the approved tops designated for
outdoor use.
WARNING: The heater shall not be located in an area
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where water sprinklers, or other devices, may cause water
to spray through the cabinet louvers and into the heater.
This could cause internal rusting or damage electrical
components, and void the warranty.
For U.S. installations, the point from where the ue
products exit the heater must be a minimum of 4' (1.2m)
below, 4' (1.2 m) horizontally from, or 1' (0.3 m) above any
door, window or gravity inlet into any building. The top
surface of the heater shall be at least 3' (0.9 m) above any
forced air inlet, or intake ducts located within 10' (3 m)
horizontally.
For installations in Canada, pool heaters shall not be
installed with the top of the vent assembly within 10' (3 m)
below, or to either side, of any opening into the building.
Refer to the latest revisions of CAN/CSA-B149.
5.3.1. Pagoda Top Installation
1. Insert tabs into keyhole (4 places). See Figure 6,
detail A.
2. Snap tabs into keyholes so as not to pull out. See
Figure 6, detail B.
WARNING: Do not install within 3' (914 mm) of a heat
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pump or an outdoor condensing unit. Strong air intake
from this type of equipment can disturb the combustion
process and cause damage or personal injury.
Figure 5. Heater with Outdoor Stackless Top
Heaters must not be installed under an overhang of less
than three 3' (0.9 m) from the top of the heater. Three sides
must be open in the area under the overhang. Roof water
drainage must be diverted away from the heaters installed
under overhangs with the use of gutters.
DETAIL A DETAIL B
OUTDOOR TOP
(SHIPPED LOOSE WITH HEATER)
Figure 6. Outdoor Top Installation
For installations in Florida and Texas, that must
comply with the Florida or Texas Building Code, follow
the directions shown in Figure 9 for the installation of
hurricane tie-down brackets for all models.
5.3.2. Indoor Heater Installation
The heater is also design-certied for indoor installation
when equipped with the approved drafthood.
For Canada, indoor installation is restricted to an enclosure
that is not occupied and does not directly communicate
with an occupied area. Refer to the latest edition of CAN/
CSA-B149 for specic requirements. Locate heater as
close as is practical to a chimney or gas vent. Heater must
always be vented to the outside. See section "Vent Piping"
on page 15 for details. Minimum allowable space is
shown on the nameplate.
WARNING: Indoor heaters require a drafthood that
AA
must be connected to a vent pipe and properly vented to
the outside. Failure to follow this procedure can cause
re or fatal carbon monoxide poisoning.
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5.3.3. Outdoor and Indoor Stack
The outdoor and indoor stacks are optional equipment
and do not come standard with the heater. Refer to
installation instructions inside box for instructions on how
to install outdoor/indoor stack.
Model Outdoor Stack Indoor Stack
268 009835 009839
408 009837 009841
Table D. Outdoor and Indoor Stack Kit Number
OUTDOOR STACK KIT
(1) Drafthood, painted
(1) Adapter plate
(3) Mounting brackets (clips)
(1) Top panel cover
(2) 1-foot sections of metal tape
(3) Screws
(1) Instructions
Clips
5.4. Combustion and Ventilation Air
5.4.1. Indoor Units Only
The heater must have both combustion and ventilation air.
Minimum requirements for net free air supply openings
are one opening that is 12" (305 mm) from the ceiling for
ventilation, and one opening that is 12" (305 mm) from the
oor for combustion air as outlined in the latest edition of
the National Fuel Gas Code, ANSI Z223.1(Canada-CAN/
CSA-B149) and any local codes that may have jurisdiction.
All Air from Inside the Building:
Each opening shall have a minimum net free area as noted:
Model Square Inches Model Square Inches
268 266 408 399
Table E. Opening Minimum Net Free Requirements
All Air from Outdoors:
When air is supplied directly from outside the building,
each opening shall have a minimum net free area as noted:
Model
Unrestricted
Opening
(sq. in.)
Typical Screened
or Louvered
Opening (sq. in.)
Typical Screened
and Louvered
Opening (sq. in.)
Figure 7. Outdoor Stack Kit Components
NOTE: The outdoor drafthood kit does not require any
additional vent pipe for proper operation. This drafthood
functions as the vent termination.
INDOOR STACK KIT
(1) Drafthood, unpainted
(1) Adapter plate
(3) Mounting brackets (clips)
(3) Screws
(1) Instructions
Clips
268 67 101 134
408 100 150 200
Table F. Opening Minimum Net Free Requirements
CAUTION: Combustion air must not be contaminated
AA
by corrosive chemical fumes which can damage the
heater and void the warranty.
Figure 8. Indoor Stack Kit Components
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