Lochinvar 502, 2072 User Manual
WARNING: If the information in these instructions is not
followed exactly, a fire or explosion may result causing property
damage, personal injury or death.
-- 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 near by 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.
CPX-I-O Rev B
Installation & Operation
Manual
Models: 502 - 2072
WARNING:
This manual supplies information for the
installation, operation, and servicing of the
appliance. It is strongly recommended that this
manual and the Copper-fin2 Pool Heater Service
Manual be reviewed completely before proceeding
with an installation. Perform steps in the order
given. Failure to comply could result in severe
personal injury, death, or substantial property
damage.
Save this manual for future reference.
Contents
HAZARD DEFINITIONS ..................................................... 2
PLEASE READ BEFORE PROCEEDING ......................... 3
SAFETY INFORMATION ................................................... 4
THE COPPER-FIN
RATINGS ........................................................................... 8
1. DETERMINE UNIT LOCATION
Location of Unit .................................................................. 9
Indoor Clearances from Combustible Construction .......... 9
Non-Combustible / Combustible Flooring .......................... 9
Freeze Protection ............................................................... 9
Location ............................................................................ 10
Hydronic Systems Anti-freeze ...........................................10
Outdoor Pool Heater Installation ...................................... 10
Combustion and Ventilation Air ........................................ 10
Combustion Options .................................................. 10 - 12
2. VENTING
Before You Begin ............................................................. 13
Vent System Options ....................................................... 14
General Venting Information ............................................ 15
Conventional Negative Draft Venting .......................... 16-18
Vertical DirectAire Venting .......................................... 19-21
Sidewall Venting .......................................................... 22-24
Horizontal DirectAire Venting ........................................... 25
Direct Venting .............................................................. 26-29
Outdoor Installation .......................................................... 30
3. GAS CONNECTIONS
Connecting to Gas Supply ............................................... 31
Gas Pressure Test ........................................................... 31
Checking Manifold Gas Pressure .................................... 31
Gas Piping ........................................................................ 31
Gas Connection .......................................................... 31-32
Combination Gas Valves ...................................................32
Checking Gas Supply Pressure ....................................... 33
2
-- HOW IT WORKS ........................ 5-7
4. WATER CONNECTIONS
Circulating Pump .............................................................. 34
Minimum Pump Performance ........................................... 35
Heat Exchanger ............................................................... 35
Auxiliary Mixed Water Limit Control ................................. 35
Piping Diagrams .......................................................... 36-38
Pumped Automatic Bypass .............................................. 39
Outdoor Operation: 3-Way Valve Cover ......................... 39
Automatic Bypass Valve Cover Installation ..................... 39
Manual Operation of the 3-Way Automatic Bypass ......... 39
Relief Valve ...................................................................... 40
Automatic Chlorinator and Chemical Feeders ................. 40
Water Flow Switch ............................................................ 40
Pump Purge Delay ........................................................... 40
Service Indicator Option ................................................... 40
5. ELECTRICAL CONNECTIONS
General Information ......................................................... 41
3-Way Automatic Bypass Valve Wiring .......................... 41
Pool Heater Operating Control Module ....................... 42-44
Wiring of the Cascade ...................................................... 44
6. STARTUP
Pre-Start Checklist ........................................................... 45
Starting the Filter System ................................................. 45
Check for Gas Leaks ....................................................... 45
Check/Control Water Chemistry ....................................... 45
Freeze Protection ........................................................ 45-46
Check Thermostat Circuit(s) ............................................ 46
Placing the Pool Heater in Operation ..........................46-48
7. OPERATING INFORMATION
General ............................................................................. 49
How the Control Module Operates .............................. 49-51
Sequence of Operation .................................................... 52
Copper-fin
Status Display Screens ............................................... 55-56
8. MAINTENANCE ..................................................... 57-61
9. CONNECTION DIAGRAM ...................................... 62-63
10. LADDER DIAGRAM .............................................. 64-65
Revision Notes .................................................. Back Cover
2
Control Module ......................................... 53-54
Hazard definitions
The following defined terms are used throughout this manual to bring attention to the presence of hazards of various risk levels
or to important information concerning the life of the product.
DANGER
WARNING
CAUTION
CAUTION
NOTICE
2
DANGER indicates an imminently hazardous situation which, if not avoided, will result in death or serious
injury.
WARNING indicates a potentially hazardous situation which, if not avoided, could result in death or serious
injury.
CAUTION indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate
injury.
CAUTION used without the safety alert symbol indicates a potentially hazardous situation which, if not
avoided, may result in property damage.
NOTICE indicates special instructions on installation, operation, or maintenance that are important but not
related to personal injury or property damage.
Please read before proceeding
Special instructions
Installation & Operation Manual
NOTICE
WARNING
WARNING
This is a gas appliance and should be installed
by a licensed electrician and/or certified gas
supplier. Service must be performed by a
qualified service installer, service agency or
the gas supplier.
If the information in these instructions is
not followed exactly, a fire or explosion may
result causing property damage, personal
injury, or death.
This appliance MUST NOT be installed in
any location where gasoline or flammable
vapors are likely to be present, unless the
installation is such to eliminate the probable
ignition of gasoline or flammable vapors.
Improper installation, adjustment,
alteration, service or maintenance can
cause injury or property damage. Refer
to this manual for assistance or additional
information, consult a qualified installer,
service agency or the gas supplier.
Checking equipment –
Upon receiving equipment, check for signs of shipping damage.
Pay particular attention to parts accompanying the appliances
which may show signs of being hit or otherwise being
mishandled. Verify total number of pieces shown on packing
slip with those actually received. In case there is damage or a
shortage, immediately notify the carrier.
Do not use this appliance if any part has been under water.
The possible damage to a flooded appliance can be extensive
and present numerous safety hazards. Any appliance that has
been under water must be replaced.
NOTICE
REMOVAL OF COMBUSTION CHAMBER LINING OR
BASE PANELS:
Avoid breathing dust and contact with skin and eyes.
• Use NIOSH certified dust respirator (N95). This type of
respirator is based on the OSHA requirements for
cristobalite at the time this document was written. Other
types of respirators may be needed depending on the
job site conditions. Current NIOSH recommendations
can be found on the NIOSH website at
http://www.cdc.gov/niosh/homepage.html.
NIOSH approved respirators, manufacturers, and phone
numbers are also listed on this website.
The ceramic fiber material used in this
appliance is an irritant; when handling or
replacing the ceramic materials it is advisable
that the installer follow these safety guides.
Apply enough water to the combustion chamber
lining to prevent airborne dust.
Remove the combustion chamber lining from the
appliance and place it in a plastic bag for disposal.
• NIOSH stated First Aid:
Eye: Irrigate immediately.
Breathing: Fresh air.
WARNING
The combustion chamber insulation in this
appliance contains ceramic fiber material.
Ceramic fibers can be converted to cristobalite
in very high temperature applications.
The International Agency for Research on
Cancer (IARC) has concluded, “Crystalline
silica in the form of quartz or cristobalite
from occupational sources is carcinogenic
to humans (Group 1).” Normal operating
temperatures in this appliance are below the
level to convert ceramic fibers to cristobalite.
Abnormal operating conditions would have
to be created to convert the ceramic fibers in
this appliance to cristobalite.
The ceramic fiber material used in this
appliance is an irritant; when handling
or replacing the ceramic materials it is
advisable that the installer follow these safety
guidelines.
Warranty –
Factory warranty (shipped with unit) does not apply to units
improperly installed or improperly operated.
Experience has shown that improper installation or system
design, rather than faulty equipment, is the cause of most
operating problems.
1. Excessive water hardness causing a lime/scale build-up in
the copper tube is not the fault of the equipment and is
not covered under the manufacturer’s warranty (see
Water Treatment and Water Chemistry).
2. Excessive pitting and erosion on the inside of the copper
tube may be caused by too much water velocity through
the tubes and is not covered by the manufacturer’s
warranty (see Pool heater Flow Rates and Temperature Rise
for flow requirements).
• Wear long-sleeved, loose fitting clothing, gloves, and eye
protection.
33
Please read before proceeding
Safety information
Installation & Operation Manual
Owner warning –
The information contained in this manual is intended for use
by qualified professional installers, service technicians, or gas
suppliers.
NOTICE
A gas appliance that draws combustion air from the equipment
room where it is installed must have a supply of fresh air
circulating around it during burner operation for proper gas
combustion and proper venting.
WARNING
Consult and follow all local Building and
Fire Regulations and other Safety Codes that
apply to this installation. Consult local gas
utility company to authorize and inspect all
gas and flue connections.
Should overheating occur or the gas supply
fail to shut off, do not turn off or disconnect
the electrical supply to the pump. Instead,
shut off the gas supply at a location external
to the appliance.
Prevention of freezing –
Heat exchangers and headers damaged by freezing are not
covered by warranty.
See Section 7, Operating Information - Freeze Protection for
more information.
Codes
The equipment shall be installed in accordance with those
installation regulations in force in the local area where the
installation is to be made. These shall be carefully followed in all
cases. Authorities having jurisdiction shall be consulted before
installations are made. In the absence of such requirements, the
installation shall conform to the latest edition of the National
Fuel Gas Code, ANSI Z223.1 and/or CAN/CGA-B149 Installation
Code. All pool heater heat exchanger construction conforms to
the latest edition of the ASME Boiler and Pressure Vessel Code,
Section IV, Part HLW.
WARNING
1. Pool heaters are heat producing appliances. To avoid
damage or injury, do not store materials against the pool
heater or the vent-air intake system. Use proper care to
avoid unnecessary contact (especially children) with the
pool heater and vent-air intake components.
To minimize the possibility of serious
personal injury, fire or damage to your
unit, never violate the following safety
rules.
2. Never cover your pool heater, lean anything against it, store
trash or debris near it, stand on it, or in any way block the
flow of fresh air to your pool heater.
3. UNDER NO CIRCUMSTANCES must flammable materials
such as gasoline or paint thinner be used or stored in the
vicinity of this pool heater, vent-air intake system or any
location from which fumes could reach the pool heater or
vent-air intake system.
4. This pool heater is only for use with the type of gas indicated
on the rating plate.
5. If you smell gas, shut off the gas supply:
• Do not try to light any appliance;
• Do not touch any electrical switch; do not use any
telephone in your building;
• Immediately call your gas supplier from a neighbor’s
telephone. Follow the gas supplier’s instructions;
• If you cannot reach your gas supplier, call the fire
department.
6. This appliance is a high efficiency pool heater which has
been designed to operate scale-free and trouble free for
many years. Particular attention should be directed to the
following items:
• Correct piping to the pool filter system with specified pipe
materials and size;
• Electrical interconnection of the pool heater controls,
bypass pump and filter pump to ensure continuous
circulation;
• Proper venting;
• Water chemistry.
7. Follow all clearances from combustibles contained in this
manual.
8. Appliance surfaces become hot during operation. Be careful
not to touch hot surfaces. Keep all adults, children, and
animals away from an operating pool heater. Severe burns
can occur.
9. This pool heater must have an adequate supply of fresh air
during operation for proper gas combustion and venting.
10. Make sure all exhaust venting is properly installed and
maintained. Improper venting of this pool heater could lead
to increased levels of carbon monoxide.
11. Do not use this pool heater if any part has been under water.
Immediately call a qualified service technician to replace the
pool heater. The possible damage to a flooded pool heater
can be extensive and present numerous safety hazards. Any
appliance that has been under water must be replaced.
12. Do not alter this pool heater in any way. Any change to this
pool heater or its controls can be dangerous.
4
The Copper-fin2 - How it works...
Installation & Operation Manual
1. Heat exchanger
The heat exchanger allows system water to flow through specially
designed tubes for maximum heat transfer. The glass lined
headers and copper fined tubing are encased in a jacket that
contains the combustion process.
2. Heat exchanger access cover
The heat exchanger access cover is a galvanized steel door which
allows access for service, maintenance, and removal of the
heat exchanger from inside the combustion chamber.
3. Blower
The blower pulls in and injects air into the individual burners
along with gas from the gas manifold where the mix is burned inside
the combustion chamber.
4. Gas valve
The referenced gas valves have a dual purpose; changing the gas
supply pressure to manifold pressure, and the reference side of
the gas valve is designed to allow chamber pressure to change the
volume of gas through the valve. This is not a design to
compensate for gas supply pressure issues.
5. Outlet/limit temperature sensor
This 4-wire limit rated sensor monitors the outlet temperature
to ensure safe operation. The appliance will adjust its firing rate
to maintain water temperatures below the maximum allowable
outlet temperature.
6. Inlet temperature sensor
This 2-wire sensor monitors the inlet temperature. The appliance
will adjust the position of the 3-way valve to maintain the inlet
water temperature above the minimum allowable inlet
temperature.
7. Electronic display
The electronic display consists of 6 buttons and a two-line
16-character liquid crystal display used to monitor the
operation of the heater as well as enter and view the
programming of the main control board.
8. Burner
The burner is a ported stainless steel construction which uses a gas
air mix to operate at a fixed input. Banks of burners turn on
or off to vary the firing rate.
9. Pool supply/limit sensor (not shown)
This 4-wire limit rated sensor monitors the temperature of
the water being supplied to the pool to ensure safe operation.
The appliance will shut down if the maximum allowable pool
supply temperature is exceeded.
10. Pool return sensor (not shown)
This 2-wire sensor is the controlling sensor and it monitors the
temperature of the pool water. The appliance will stage to
maintain pool temperature set point and turn off when set point
is met.
11. Gas supply pipe
The gas supply pipe on this appliance is 1 1/4 or 2" (depending on
model) diameter NPT. Please reference the National Fuel Gas
Code charts for connection details.
12. SMART SYSTEM Control Module
The SMART System Control Module is the main control for the
appliance. This module contains the programming that
operates the blower, gas valve, and pumps in addition to other
programmable features.
13. Air intake
Fresh air for combustion is drawn through a filter provided at the
air intake, located at either the rear or right side of the appliance.
14. Line voltage terminal strip
The line voltage terminal strip provides a location to connect
all of the line voltage (120 VAC) contact points to the unit.
15. Low voltage connection board
The low voltage connection board provides a location to connect
all of the low voltage devices to the appliance. This is where most
of the external safety controls are connected.
16. Front doors - upper and lower
The front doors provide access to the gas train as well as the
blower, burners and other key components for service and
maintenance.
17. Hot surface igniter (HSI)
The hot surface igniter is a device that is used to ignite the
air/gas mixture as well as monitor the performance of the flame
during operation. This device acts as a flame sense electrode.
18. Flame inspection window (sight glass)
The flame inspection windows, located on either side of the
appliance, allow for visual inspection of the burners and flame
during operation.
19. Manual reset high limit sensor
This device monitors the outlet water temperature to ensure
safe operation. If the temperature exceeds its setting (field
adjustable), it will break the control circuit, shutting the
appliance down. Manual reset is performed through the display.
20. Relief valve
The relief valve is a safety device that ensures the maximum
pressure of the appliance is not exceeded. Pool heaters operate
on temperature and pressure and are shipped standard as 150 PSI
and 210°F (98.9°C).
21. Power switch
The power switch is used to engage and disengage power to the
appliance on the 120 VAC circuit.
22. Air pressure switch
The air pressure switch is a safety device which ensures proper
blower operation. The air pressure switch is wired in series with
the low voltage control circuit in such a way that if the fan does not
engage or shuts down prematurely the device will break the
control circuit and the unit will shut down.
23. Flow switch
The flow switch is a safety device that ensures flow through the
heat exchanger during operation. This appliance is low mass and
should never be operated without flow. The flow switch makes
contact when flow is detected and allows the unit to operate. If
flow is discontinued during operation for any reason the flow
switch will break the control circuit and the unit will shut down.
24. Drain port(s)
Location from which the heat exchanger can be drained. The
drain ports are located underneath the front header.
25. Manual shutoff valve (not shown)
Manual valve used to isolate the unit from the gas supply.
5
The Copper-fin2 - How it works...
Installation & Operation Manual
11
24
16
Models 502 - 752 Front View
16
16
16
13
20 23
Models 502 - 752 Rear View
15
3
12
14
21
8
Models 502 - 752 Right Side (inside unit)
7
19
6
5
4
22
2
1
18
17
Models 502 - 752 Left Side (inside unit)
6
The Copper-fin2 - How it works... (continued)
Installation & Operation Manual
11
24
16 16
Models 992 - 2072 Front View
16
16
13
20
23
Models 992 - 2072 Rear View
15
3
12
14
21
22
8
Models 992 - 2072 Right Side (inside unit)
7
19
6
5
4
2
1
18
17
Models 992 - 2072 Left Side (inside unit)
7
Ratings
Note: Change “N” to
“L” for L.P. gas models.
Installation & Operation Manual
Specifications
Model Number
Appliance Water
Content Gallons
CPN0502 1.7 2" 1-1/4" 6"
Water Connections Gas Connections
Air / Vent
Sizes
(Note 1)
CPN0652 2.0 2" 1-1/4" 8"
CPN0752 2.1 2" 1-1/4" 8"
CPN0992 2.2 2-1/2" 2" 10"
CPN1262 2.6 2-1/2" 2" 12"
CPN1442 2.9 2-1/2" 2" 12"
CPN1802 3.3 2-1/2" 2" 12"/14"
CPN2072 3.6 2-1/2" 2" 12"/14"
NOTICE
Maximum allowed working pressure is located on the rating plate.
Notes:
1. Copper-fin2 pool heaters require special gas venting. Use only the vent materials and methods specified in the Copper-Fin2
Pool Heater Installation and Operation Manual.
2
2. The Copper-fin
is orificed for operation up to 2000 feet altitude, and including up to 4,500 feet, with no field adjustments.
The appliance will de-rate by 4% for each 1000 feet above sea level up to 4,500 feet. Consult the factory for installations above
4,500 feet elevation.
8
1 Determine unit location
Location of unit
This unit meets the safe lighting performance criteria with
the gas manifold and control assembly provided, as specified
in the ANSI standards for gas-fired units and ANSI Z21.10.3/
CSA 4.3 - latest edition.
1. Maintain all clearances from combustible construction
when locating appliance. See Clearances from Combustible
Construction, this page.
2. Locate the appliance so that if water connections should
leak, water damage will not occur. When such locations
cannot be avoided, it is recommended that a suitable
drain pan, adequately drained, be installed under the unit.
The pan must not restrict combustion airflow. Under no
circumstances is the manufacturer to be held responsible
for water damage in connection with this unit, or any of its
components.
3. The appliance must be installed so that the ignition
system components are protected from water (dripping,
spraying, rain, etc.,) during appliance operation and service
(circulator replacement, control replacement, etc.,).
4. Appliances located in a residential garage and in adjacent
spaces that open to the garage and are not part of the living
space of a dwelling unit must be installed so that all burners
and burner ignition devices have a minimum clearance of
not less than 18" (46 cm) above the floor. The appliance
must be located or protected so that it is not subject to
physical damage by a moving vehicle.
5. DO NOT install this appliance in any location where
gasoline or flammable vapors are likely to be present.
6. The appliance must be installed on a level floor.
7. Combustible floor installation:
a. Models 502 - 752 require an approved floor kit for
installation on combustible flooring (reference Table
1A).
b. Models 992 - 2072 are approved for installation
on combustible flooring without a floor kit. Note:
Concrete block over wood flooring is not considered
non-combustible.
8. DO NOT install this appliance directly on carpeting or
other combustible material.
9. Maintain required clearances from combustible surfaces,
reference the Indoor Clearances from Combustible
Construction Section, this page.
10. For outdoor models, you must install an optional vent
cap. Instructions for mounting the vent cap are included
in the venting section of this manual. Do not install
outdoor models directly on the ground. You must install
the outdoor unit on a concrete, brick, block, or other
non-combustible pad. Outdoor models have additional
special location and clearance requirements. See Outdoor
Installation Venting, page 30. A wind proof cabinet
protects the unit from weather.
Indoor clearances from combustible
construction
Maintain minimum specified clearances for adequate
operation. Allow sufficient space for servicing pipe
connections, pump and other auxiliary equipment, as well
as the unit. See rating plate for specific service clearance
requirements.
Installation & Operation Manual
Right Side 3" (7.5 cm)
Rear 3" (7.5 cm) (3" min. from any surface)*
Left Side 6" (15 cm) (24" (0.61 m) suggested for
service)
Front Alcove* (30" (0.76 m) suggested for service)
Top 3" (7.5 cm)
Flue 1" (25.4 mm)
Hot Water Pipes 1" (25.4 mm)
*An Alcove is a closet without a door. Thirty-six inches (36")
to rear required for outdoor installation.
Note: No additional clearance is needed on the right side of the
unit for the observation port. An observation port is located on
both the right and left side of the unit.
Figure 1-1_Indoor clearances from combustible construction
3"
MIN
REAR
6"
MIN
LEFT
SIDE
MIN
3"
MIN
TOP
NOTICE
30"
MIN
FRONT
Clearances from combustible construction
are noted on the appliance rating plate.
RIGHT
SIDE
TABLE - 1A
COMBUSTIBLE FLOOR KITS
Model Kit Number
502 CFK3302
652 CFK3303
752 CFK3304
Freeze protection
Although these units are CSA International design-certifi ed for
outdoor installations, such installations are not recommended
in areas where the danger of freezing exists. You must provide
proper freeze protection for outdoor installations, units installed
in unheated mechanical rooms or where temperatures may
drop to the freezing point or lower. If freeze protection is not
provided for the system, a low ambient temperature alarm is
recommended for the mechanical room. Damage to the unit by
freezing is non-warrantable.
9
3"
1 Determine unit location
Anytime the inlet temperature drops below 45°F, the
control turns on the pump contact. If the inlet temperature is
below 37°F, and the unit is in the ON Mode, the fi rst stage will
fi re.
Location
Locate indoor pool heaters in a room having a temperature
safely above freezing [32°F (0°C)].
Installation & Operation Manual
CAUTION
A mechanical room operating under a negative
draft pressure may experience a down draft in
the flue of a pool heater when it is not firing.
The cold outside air pulled down the flue
may freeze a heat exchanger. This condition
must be corrected to provide adequate freeze
protection.
Hydronic systems anti-freeze
Freeze protection for a pool heater using an indirect coil can
be provided by using hydronic system antifreeze. Follow the
appliance manufacturers instructions. Do not use undiluted or
automotive type antifreeze (see page 40).
Outdoor pool heater installation
A snow screen should be installed to prevent snow and ice
accumulation around the unit or its venting system.
Combustion and ventilation air
Provisions for combustion and ventilation air must be in
accordance with Air for Combustion and Ventilation, of the
latest edition of the National Fuel Gas Code, ANSI Z223.1,
in Canada, the latest edition of CAN/CGA-B149 Installation
Code for Gas Burning Appliances and Equipment, or applicable
provisions of the local building codes.
Provide properly-sized openings to the equipment room to
assure adequate combustion air and proper ventilation when
the unit is installed with conventional venting or sidewall
venting.
Combustion air options
CAUTION
This unit has four combustion air options.
1. Outside Combustion Air, No Ducts
You can direct outside combustion air to this unit using either
one or two permanent openings.
Under no circumstances should the
equipment room ever be under a
negative pressure. Particular care
should be taken where exhaust fans,
attic fans, clothes dryers, compressors,
air handling units, etc., may take away
air from the unit.
Figure 1-2_Outside Combustion Air - Single Opening
Two Openings
The combustion air opening must have a minimum free area of
one square inch per 4000 Btu/hr input (5.5 cm2 per kW). You
must locate this opening within 12" (30 cm) of the bottom of the
enclosure (see FIG. 1-3).
The ventilation air opening must have a minimum free area of
one square inch per 4000 Btu/hr input (5.5 cm2 per kW). You
must locate this opening within 12" (30 cm) of the top of the
enclosure.
Figure 1-3_Outside Combustion Air - Two Openings
2. Outside Combustion Air, Using Ducts
You can direct outside combustion air to this unit using two air
ducts to deliver the air to the mechanical room (see FIG. 1-5).
Each of the two openings must have a minimum free area of one
square inch per 2000 Btu input (11cm2 per kW).
3. Combustion Air from Interior Space
You can direct combustion air to this unit using air from an
adjoining interior space. You must provide two openings from
the mechanical room to the adjoining room (see FIG. 1-4).
Each of the two openings must have a net free area of one square
inch per 1000 Btu input (22cm
square inches (645cm2).
2
per kW), but not less than 100
One Opening
The opening must have a minimum free area of one square
inch per 3000 Btu input (7 cm
opening within 12" (30 cm) of the top of the enclosure (see FIG.
1-2).
2
per kW). You must locate this
10
Figure 1-4_Combustion Air from Interior Space
1 Determine unit location (continued)
All dimensions are based on net free area in square inches.
Metal louvers or screens reduce the free area of a combustion air
opening a minimum of approximately 25%. Check with louver
manufacturers for exact net free area of louvers. Where two
openings are provided, one must be within 12" (30 cm) of the
ceiling and one must be within 12" (30 cm) of the floor of the
equipment room. Each opening must have a minimum net free
area as specified in TABLE 1C, this page. Single openings shall
be installed within 12" (30 cm) of the ceiling.
Installation & Operation Manual
Figure 1-5_Outside Combustion Air Through Ducts
4. Outside Combustion Air - Using Direct Venting
With this option, you can connect combustion air vent piping
directly to the unit. See the information under Direct Venting
starting on page 26 for specific information regarding this
option.
TABLE - 1C
MINIMUM RECOMMENDED COMBUSTION
AIR SUPPLY TO EQUIPMENT ROOM
*Outside Air from
Model
Number
502
652
752
992
1262
1442
1802
2072
2 Openings Directly from
Outdoors
Top
Opening, in
125
(806 cm2)
163
(1052 cm2)
188
(1213 cm2)
248
(1600 cm2)
315
(2032cm2)
360
(2323cm2)
450
(2903cm2)
518
(3342cm2)
Bottom
2
Opening, in
(806 cm2)
(1052 cm2)
(1213 cm2)
(1600 cm2)
(2032cm2)
(2323cm2)
(2903cm2)
(3342cm2)
125
163
188
248
315
360
450
518
*Outside Air from
1 Opening Directly
from Outdoors, in
2
167
(1077 cm2)
217
(1400 cm2)
250
(1613 cm2)
330
(2129 cm2)
420
(2710 cm2)
480
(3097 cm2)
600
(3871 cm2)
690
(4452 cm2)
2
CAUTION
The combustion air supply must be
completely free of any flammable vapors
that may ignite or chemical fumes which
may be corrosive to the appliance. Common
corrosive chemical fumes which must be
avoided are fluorocarbons and other
halogenated compounds, most commonly
present as refrigerants or solvents, such as
Freon, trichlorethylene, perchlorethylene,
chlorine, etc. These chemicals, when
burned, form acids which quickly attack
the heat exchanger finned tubes, headers,
flue collectors, and the vent system. The
result is improper combustion and a nonwarrantable, premature unit failure.
Inside Air from
2 Ducts Delivered from
Outdoors
Top
Opening, in
2
Opening, in
Bottom
250
(1613 cm2)
(1613 cm2)
325
(2097 cm2)
(2097 cm2)
375
(2420 cm2)
(2420 cm2)
495
(3194 cm2)
(3194 cm2)
630
(4065 cm2)
(4065 cm2)
720
(4646 cm2)
(4646 cm2)
900
(5807 cm2)
(5807 cm2)
1035
(6678 cm2)
(6678 cm2)
250
325
375
495
630
720
900
1035
Inside Air from
2 Ducts Delivered from Interior
Space
2
Opening, in
(3226 cm2)
(4194 cm2)
(4839 cm2)
(6388 cm2)
(8130 cm2)
(9291 cm2)
(11614 cm2)
(13356 cm2)
Top
500
650
750
990
1260
1440
1800
2070
2
Opening, in
(3226 cm2)
(4194 cm2)
(4839 cm2)
(6388 cm2)
(8130 cm2)
(9291 cm2)
(11614 cm2)
(13356 cm2)
Bottom
500
650
750
990
1260
1440
1800
2070
2
*Outside air openings shall directly communicate with the outdoors. When combustion air is drawn from the outside through a
duct, the net free area of each of the two openings must have twice (2 times) the free area required for Outside Air/2 Openings. The
above requirements are for the pool heater only; additional gas fired appliances in the equipment room will require an increase in
the net free area to supply adequate combustion air for all appliances.
11
1 Determine unit location
Installation & Operation Manual
Exhaust fans
Any fan or equipment which exhausts air from the mechanical
room may deplete the combustion air supply and/or cause a
down draft in the venting system. Spillage of flue products from
the venting system into an occupied living space can cause a
very hazardous condition that must be immediately corrected.
If a fan is used to supply combustion air to the mechanical
room, the installer must make sure that it does not cause drafts
which could lead to nuisance operational problems with the
pool heater.
Vertical DirectAire™, Horizontal DirectAire™, and Direct Vent
venting systems have specific requirements for combustion air
ducts from the outside which are directly connected to the unit.
See the requirements for combustion air duct in the venting
section.
NOTICE
Use of filters having MERV (Minimum
Efficiency Reporting Value) ratings higher than
4 is not recommended. Higher efficiency
low-micron filters can limit combustion
air leading to either nuisance problems or
potential component damage if used over
prolonged periods of time. Filters having
a MERV rating of 5 to 6 may be used
on a limited basis during the construction
phase of a project provided they are replaced
once filter loading becomes apparent. After
the construction phase is completed, it is
recommended that the filter be changed to a
4 or lower MERV disposable type filter.
Combustion air filter
This unit has a standard air filter located at the combustion air
inlet. This filter helps ensure clean air is used for the combustion
process. Check this filter every month and replace when it
becomes dirty. The filter size on Models 502 - 752 is 12" x 12"
x 1" (30.5 cm x 30.5 cm x 2.5 cm) and 16" x 16" x 1" (40.6 cm
x 40.6 cm x 2.5 cm) on Models 992 - 2072. You can find these
commercially available filters at any home center or HVAC
supply store.
For convenience and flexibility, you can direct the combustion
air inlet from either the back or right side of the unit. To arrange
the combustion air inlet for side entry, follow the steps below:
1. Remove the metal panel from the unit’s side wall (see
FIG. 1-6).
2. Remove screws from the air filter/bracket assembly.
3. Move the filter/bracket assembly from the rear of unit to the
side opening (see FIG. 1-7).
4. Attach filter/bracket assembly to the unit’s side using the
pre-drilled screw holes.
5. Attach the metal panel to the rear combustion air opening
to seal it off.
Figure 1-6_Metal Panel Covering Side Combustion
Air Inlet
NOTICE
CAUTION
During construction the air filter should be checked more frequently to ensure it does not become clogged with
combustion dirt and debris.
Sustained operation of an appliance with a clogged filter may result in nuisance operational problems, bad
combustion, and non-warrantable component failures.
12
Figure 1-7_Moving Air Filter / Bracket Assembly from
Rear of Unit to Side
Installation & Operation Manual
2 Venting
BEFORE YOU BEGIN
Identify your appliance’s vent system:
This manual covers venting requirements for CAT I models and CAT IV vent materials. Be sure to correctly identify the type of
vent system your appliance requires before proceeding.
CP (N,L) 0502
CP (N,L) 0652
CP (N,L) 0752
CP (N,L) 0992
CP (N,L) 1262
CP (N,L) 1442
CP (N,L) 1802
CP (N,L) 2072
Venting options:
A B C
E
F
= Direct Vent Options
CAT IV
= Outdoor Vent Option
D
= B-Vent Material
CAT I
DANGER
Failure to use correct venting materials can result in loss of life from flue gas spillage into working or living
space.
Venting Category Definitions: (Reference National Fuel Gas Code ANSI Z223.1)
CAT I: Negative pressure non-condensing
An appliance that operates with a non-positive vent static pressure with a vent gas temperature that avoids excessive condensate
production in the vent.
CAT IV: Positive pressure condensing
An appliance that operates with a positive vent static pressure with a vent gas temperature that may cause excessive condensate
production in the vent.
CAT IV Flue pipe materials
The following manufacturers supply flue materials suitable for these models when installed as CAT IV. All materials are made with
AL29-4C stainless steel.
Heat-Fab Inc., Saf-T CI Vent with AL29-4C stainless steel
Protech Systems Inc., Fas N Seal Vent with AL29-4C stainless steel
Metal-Fab Inc., Corr/Guard Vent with AL29-4C stainless steel
Or other listed Category IV vent systems suitable for a condensing, positive pressure, gas fired appliance.
A Category IV flue MUST have all vent joints and seams sealed gastight and have provisions for a drain to properly collect and
dispose of condensate that may occur in the venting system.
13
12"
MIN
3'
MIN
Installation & Operation Manual
2 Venting
Vent system options: (Note: Installations shown below are representative, actual installations may vary from those shown.)
This option uses a vertical rooftop flue termination
with air supplied from the equipment room - see
A
CONVENTIONAL NEGATIVE
DRAFT VENTING
page 16.
This option uses a vertical conventional vent for
flue products with air supplied by a pipe from the
B
VERTICAL DIRECTAIRE VENTING
sidewall or rooftop - see page 19.
This option uses a powered vent assembly to
exhaust the flue products out a sidewall with air
D
HORIZONTAL DIRECTAIRE
VENTING
supplied by a pipe from the sidewall - see page 25.
3'
MIN
12"
MIN
This option uses a sealed AL29-4C flue and a
separate combustion air pipe to the outdoors.
E
This system terminates both the flue and
combustion air inlet in the same pressure zone
- see page 26.
NOTE: CAT I B-VENT MATERIALS MAY BE USED WHEN THE
POWERED VENT I S CONNECTED DIRECTLY TO THE OUTSIDE
VENT CAP. IF THE POWERED VENT IS NOT CONNECTED
DIRECTLY TO THE OUTSIDE VENT CAP, THEN CAT IV - AL29-4C
VENT MATERIALS MUST BE USED FROM THE POWERED VENT
TO THE OUTSIDE VENT CAP.
3'
This option uses the installation of a special air
inlet / vent cap on top of the unit - see page 30.
C
This option uses a powered vent assembly
to exhaust the flue products out a sidewall
vent termination with air supplied from the
F
equipment room - see page 22.
SIDEWALL VENTING
NOTE: CAT I B-VENT MATERIALS MAY BE USED WHEN THE
POWERED VENT I S CONNECTED DIRECTLY TO THE OUTSIDE
VENT CAP. IF THE POW ERED VENT IS NOT CONNECTED
DIRECTLY TO THE OUTSIDE VENT CAP, THEN CAT IV - AL29-4C
VENT MATERIALS MUST BE USED FROM THE POWERED VENT
TO THE OUTSIDE VENT CAP.
14
OUTDOOR VENTING
Installation & Operation Manual
2 Venting (continued)
General information
You must supply adequate combustion and ventilation air to this unit. You must provide minimum clearances for the vent
terminal from adjacent buildings, windows that open, and building openings. Follow all requirements set forth in the latest edition
of the National Fuel Gas Code, ANSI Z223.1, in Canada, the latest edition of CAN/CGA Standard B149 Installation Code for Gas
Burning Appliances and Equipment or applicable local building codes. Vent installations for connection to gas vents or chimneys
must be in accordance with “Venting of Equipment” of the above-mentioned standards.
NOTICE
Examine the venting system at least once each year. Check all joints and vent pipe connections for tightness. Also
check for corrosion or deterioration. If you find any problems, correct them at once.
Venting support
Support horizontal portions of the venting system to prevent sagging. Provide an upward slope of at least 1/4 inch per foot
(21mm/m) on all horizontal runs from the unit to the vertical flue run or to the vent terminal on sidewall venting installations.
Do not use an existing chimney as a raceway if another appliance or fireplace is vented through the chimney. The weight of the
venting system must not rest on the unit. Provide adequate support of the venting system. Follow all local and applicable codes.
Secure and seal all vent connections. Follow the installation instructions from the vent material manufacturer.
Barometric damper location
Any venting system option that requires a barometric damper must adhere to the following directions for optimum performance.
The preferred location for the barometric damper is in a tee or collar installed in the vertical pipe rising from the unit’s flue outlet.
The barometric damper MUST NOT be installed in a bull head tee installed on the unit’s flue outlet. The tee or collar containing
the barometric damper should be approximately three feet vertically above the connection to the unit’s flue outlet. This location
ensures that any positive velocity pressure from the unit’s internal combustion fan is dissipated and the flue products are rising
due to buoyancy generated from the temperature of the flue products. Adjust the weights on the damper to ensure that draft is
maintained within the specified range.
TABLE - 2A
FLUE AND AIR INLET PIPE SIZES
MODEL FLUE SIZE AIR INLET SIZE MODEL FLUE SIZE AIR INLET SIZE*
502 6" 6" 1262 12" 12"
652 8" 8" 1442 12" 12"
752 8" 8" 1802 14" 12"
992 10" 10" 2072 14" 12"
*Minimum diameter for air inlet pipe. Installer may increase diameter one pipe size for ease of installation, if needed.
15
2 Venting
Conventional negative draft venting - see page 14.
A
NOTICE
This option uses Type-B double-wall flue outlet piping. The blower brings in combustion air. The buoyancy of the
heated flue products cause them to rise up through the flue pipe. The flue outlet terminates at the rooftop.
Negative draft
The negative draft in a conventional vent installation must be within the range of 0.02 to 0.08 inches w.c. to ensure
proper operation. Make all draft readings while the unit is in stable operation (approximately 2 to 5 minutes).
Connect the flue vent directly to the flue outlet opening on the top of the unit. No additional draft diverter or
barometric damper is needed on single unit installations with a dedicated stack and a negative draft within the
specified range of 0.02 to 0.08 inches w.c. If the draft in a dedicated stack for a single unit installation exceeds the
maximum specified draft, you must install a barometric damper to control draft. Multiple unit installations with
combined venting or common venting with other Category I negative draft appliances require each pool heater to
have a barometric damper installed to regulate draft within the proper range.
Do not connect vent connectors serving appliances vented by natural draft (negative draft) to any portion of a
mechanical draft system operating under positive pressure. Connecting to a positive pressure stack may cause flue
products to be discharged into the living space causing serious health injury.
Before installing a venting system, follow requirements found in the General Venting section.
Installation & Operation Manual
Flue outlet piping
With this venting option, you must use Type-B double-wall vent materials. Vent materials must be listed by a
nationally-recognized test agency for use as vent materials. Make the connections from the unit vent to the outside
stack as direct as possible with no reduction in diameter. Use the National Fuel Gas Code venting tables for doublewall vent to properly size all vent connectors and stacks. Follow the vent manufacturer’s instructions when installing
Type-B vents and accessories, such as firestop spacers, vent connectors, thimbles, caps, etc.
Provide adequate clearance to combustibles for the vent connector and firestop.
When planning the venting system, avoid possible contact with plumbing or electrical wiring inside walls, ceilings,
and floors. Locate the unit as close as possible to a chimney or gas vent.
Avoid long horizontal runs of the vent pipe, 90° elbows, reductions and restrictions.
No additional draft diverter or barometric damper is required on single unit installations with a dedicated stack and
a negative draft maintained between 0.02 to 0.08 inches w.c.
Common Venting Systems
You can combine the flue with the vent from any other negative draft, Category I appliance. Using common venting
for multiple negative draft appliances requires you to install a barometric damper with each unit. This will regulate
draft within the proper range. You must size the common vent and connectors from multiple units per the venting
tables for Type-B double-wall vents in the latest edition of the National Fuel Gas Code, ANSI Z223.1 and/or CAN/
CGA-B149 Installation Code.
16
Common venting systems may be too large when an existing unit is removed.
At the time of removal of an existing appliance, the following steps shall be followed with each appliance remaining
connected to the common venting system placed in operation, while other appliances remaining connected to the
common venting system are not in operation.
1. Seal any unused opening in the common venting system.
2. Visually inspect the venting system for proper size and horizontal pitch. Make sure there is no blockage or
restriction, leakage, corrosion and other unsafe conditions.
3. If possible, close all building doors and windows. Close all doors between the space in which the appliances
remaining connected to the common venting system are located and other building spaces.
Installation & Operation Manual
2 Venting (continued)
4. Turn on clothes dryers and any other appliances 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.
5. Close fireplace dampers.
6. Place in operation the unit being inspected. Follow the lighting instructions. Adjust thermostat so unit will operate continuously.
7. Test for spillage at the draft hood/relief opening after 5 minutes of main burner operation. Use the flame of a match or candle,
or smoke from a cigarette, cigar or pipe.
8. After making sure that each appliance remaining connected to the common venting system properly vents when tested as above,
return doors, windows, exhaust fans, fireplace dampers and other gas burning appliances to their previous conditions of use.
9. Correct any improper operation of the common venting system so that the installation conforms to the latest edition of the
National Fuel Gas Code, ANSI Z223.1, in Canada, the latest edition of CAN/CGA-B149 Installation Code for Gas Burning
Appliances and Equipment. When resizing any portion of the common venting system, resize to approach the minimum size as
determined using the appropriate tables of the latest edition of the National Fuel Gas Code, ANSI Z223.1, in Canada, the latest
edition of CAN/CGA-B149 Installation Code for Gas Burning Appliances and Equipment.
Masonry chimney installations
A masonry chimney must be properly sized for the installation of a high efficiency gas-fired appliance. Venting of a high efficiency
appliance into a cold or oversized masonry chimney can result in operational and safety problems. Exterior masonry chimneys,
with one or more sides exposed to cold outdoor temperatures, are more likely to have venting problems. The temperature of the
flue products from a high efficiency appliance may not be able to sufficiently heat the masonry structure of the chimney to generate
proper draft. This will result in condensing of flue products, damage to the masonry flue/tile, insufficient draft and possible spillage
of flue products into an occupied living space. Carefully inspect all chimney systems before installation.
WARNING
NOTICE
Inspection of a masonry chimney
A masonry chimney must be carefully inspected to determine its suitability for the venting of flue products. A clay-tile-lined
chimney must be structurally sound, straight and free of misaligned tile, gaps between liner sections, missing sections of liner or any
signs of condensate drainage at the breaching or clean out. If there is any doubt about the condition of a masonry chimney, it must
be relined with a properly-sized and approved chimney liner system. An unlined masonry chimney must not be used to vent flue
products from this high-efficiency unit. An unlined chimney must be relined with an approved chimney liner system when a new
appliance is being attached to it. Metallic liner systems (Type-B double-wall or flexible or rigid metallic liners) are recommended.
Consult with local code officials to determine code requirements or the advisability of using or relining a masonry chimney.
Do not vent this unit into a masonry chimney without a sealed stainless steel liner system. Any breaks, leaks,
or damage to the masonry flue/tile will allow the flue products to leak from the chimney and into occupied
living spaces. This could cause serious injury or death due to carbon monoxide poisoning and other harmful
flue products.
Check with local code officials to determine code requirements or the advisability of using a masonry chimney
with a sealed corrosion-resistant liner system.
Vertical vent termination clearances and location
The vent terminal should be vertical and exhaust outside the building at least 2 feet (0.61 m) above the highest point of the roof
within a 10 foot (3.05 m) radius of the termination.
The vertical termination must be a minimum of 3 feet (0.91 m) above the point of exit.
A vertical termination less than 10 feet (3.05 m) from a parapet wall must be a minimum of 2 feet (0.61 m) higher than the parapet
wall.
Keep the vent cap clear of snow, ice, leaves, and debris to avoid blocking the flue.
17
2 Venting
Installation & Operation Manual
Figure 2-1_Vent Termination from Peaked Roof - 10 ft.
or Less From Ridge
NOTICE
Figure 2-3_Vent Termination from Flat Roof - 10 ft.
or Less From Parapet Wall
Vent terminations are not shown in FIG.’s 2-1 thru 2-4. Make sure all vertical vents are installed with vent
terminations recommended by the vent manufacturer.
Figure 2-2_Vent Termination from Peaked Roof - 10 ft.
or More From Ridge
Figure 2-4_Vent Termination from Flat Roof - 10 ft. or
More From Parapet Wall
18
2 Venting (continued)
Vertical DirectAire ™ venting - see page 14.
NOTICE
B
Combustion air inlet piping
The Vertical DirectAire™ vent system is the same as the Conventional Negative Draft vent system, except it pulls
combustion air from the outdoors through a separate air inlet pipe. Follow all requirements in the Conventional
Negative Draft Venting section on page 16.
The Vertical DirectAire™ vent system requires you to install two pipes directly to the unit; one vertical pipe with
a rooftop termination for the flue products and one pipe for combustion air. For this venting option, you must
purchase the DV box adapter from the appliance manufacturer. The DV box attaches to the air inlet of the unit. The
pipe for combustion air attaches to the DV box (see FIG. 2-11 on page 28). Reference page 28 for a list of approved
air intake materials.
Before installing a venting system, follow requirements found in the General Venting section.
Installation & Operation Manual
WARNING
The sidewall or vertical rooftop DirectAire™ combustion air supply system has specific material and installation requirements. The
air inlet pipe connects directly to the unit to supply combustion air. In most installations, the combustion air inlet pipe will be a
dedicated system with one air inlet pipe per unit. You can combine multiple air inlets if the guidelines in Combined Air Inlet Points,
page 20 are followed. The air inlet pipe will be connected to a combustion air inlet cap as specified in this section.
For normal installations, this system uses a single-wall pipe to supply combustion air from outdoors directly to the unit.
In cold climates, use a Type-B double-wall vent pipe or an insulated single-wall pipe for combustion air. This will help prevent
moisture in the cool incoming air from condensing and leaking from the inlet pipe.
Length of air inlet pipe
The installed length of air inlet pipe from the unit to the outside air inlet cap must not exceed 50 equivalent feet (15.2 m). Subtract
5 feet (1.5 m) of equivalent length for each 90° elbow. Subtract 2.5 feet (0.7 m) of equivalent length for each 45° elbow.
Do not exceed the limits for the combustion air inlet piping lengths.
Sidewall air inlet
The sidewall air inlet cap is supplied in the Sidewall Air Inlet Kit. Order the kit from the appliance manufacturer. This sidewall cap
supplies combustion air for a single unit only. See Table 2B, page 21, for kit numbers.
Locate the unit as close as possible to the sidewall where you will install the combustion air supply system.
Locate and install the combustion air inlet cap correctly. Failure to do so can allow the discharge of flue products
to be drawn into the combustion process. This can result in incomplete combustion and potentially hazardous
levels of carbon monoxide in the flue products. This will cause operational problems and the spillage of flue
products. Spillage of flue products can cause personal injury or death due to carbon monoxide poisoning.
Figure 2-5_Sidewall Combustion Air Inlet
Figure 2-6_Air Inlet Cap for Sidewall Termination
19
Installation & Operation Manual
2 Venting
To prevent recirculation of flue products from an adjacent vent cap into the combustion air inlet, follow all applicable clearance
requirements in the latest edition of the National Fuel Gas Code and/or CAN/CGA-B149 Installation Code and instructions in the
Installation and Operation Manual.
Clearances
You must install the combustion air inlet cap at least one foot (0.30 m) above ground level and above normal snow levels.
The point of termination for the combustion air inlet cap must be at least 3 feet (0.91 m) below the point of flue gas termination if
it is located within 10 feet (3.05 m) of the flue outlet. Make sure to properly install the air inlet cap assembly on the air inlet pipe.
Do not install the combustion air inlet cap closer than 10 feet (3.05 m) from an inside corner of an L-shaped structure.
Vertical Rooftop Air Inlet
Use the vertical air inlet terminations available from the appliance manufacturer, recommended and/or supplied by the vent
manufacturer, or use two 90° elbows as described on page 29.
3'
MIN
12"
MIN
You must locate the air inlet termination elbow at least 12"
(30 cm) above the roof or above normal snow levels.
If the air inlet cap is within a 10-foot (3.05 m) radius of the flue
outlet, the point of termination for the combustion air inlet
cap must be at least 3 feet (0.91 m) below the point of flue gas
termination (vent cap).
Do not install the combustion air inlet cap closer than 10 feet
(3.05 m) from an inside corner of an L-shaped structure.
Combined air inlet points
The air inlet pipes from multiple pool heaters can be combined
to a single common connection if the common air inlet pipe has
a cross sectional area equal to or larger than the total area of all
air inlet pipes connected to the common air inlet pipe.
Example: Two 10" air inlet pipes (78.5 in2 area each) have a total
Figure 2-7_Rooftop Combustion Air Inlet
The air inlet point for multiple pool heater air inlets must be provided with an exterior opening which has a free area equal to
or greater than the total area of all air inlet pipes connected to the common air inlet. This exterior opening for combustion air
must connect directly to the outdoors. The total length of the combined air inlet pipe must not exceed a maximum of 50 (15.2 m)
equivalent feet. Subtract 5 feet (1.5 m) for each 90° elbow in the air inlet pipe. You must deduct the restriction in area provided by
any screens, grills or louvers installed in the common air inlet point. These are common on the sidewall air inlet openings. Screens,
grills or louvers installed in the common air inlet can reduce the free area of the opening from 25% to 75% based on the materials
used.
area of 157 in2 and will require a 15" (176.7 in2 area) common
air inlet pipe.
You can terminate the combustion air pipe either horizontally with a sidewall air inlet or vertically with a rooftop air inlet. The
installed length of air inlet pipe from the unit to the outside air inlet cap must not exceed 50 equivalent feet (15.2 m).
20
2 Venting (continued)
Installation & Operation Manual
WARNING
3'
MIN
12"
MIN
Figure 2-8_Vertical DirectAire™ Installation
w/Rooftop Combustion Air Inlet
Only use a sidewall air inlet cap supplied by the appliance
manufacturer or a rooftop air inlet cap supplied by either the vent
or appliance manufacturer. Using any other air inlet cap for single
unit installations or using a common air inlet cap for multiple
units with insufficient free area and/or protections from wind and
weather may result in operational problems and the spillage of
flue products. Spillage of flue products can cause personal injury
or death due to carbon monoxide poisoning.
For single unit installations with sidewall air inlet you must order the sidewall air
inlet kit from the appliance manufacturer. The part number for each SVK kit is
listed by unit size in Table 2B.
For single unit installations with rooftop air inlet (see FIG. 2-8), you must order
the rooftop air inlet kit from the appliance manufacturer. The part number for
each VDK kit is listed by unit size in Table 2B. Purchase the flue pipe, rooftop
flue termination, and air inlet pipe locally.
There is no vent kit for combined air supply systems for multiple units. Make
sure the air inlet cap is properly sized. You must purchase this cap locally.
Venting of flue products
For venting flue products vertically to the outdoors, follow all requirements in
the installation instructions for conventional venting in this manual.
Follow all clearance requirements in Vertical Vent Termination Clearances and
Location on page 17.
A barometric damper is not required in the flue on Vertical DirectAire™
installations if the draft is within the negative 0.02 to 0.08 inches w.c. required
for proper operation. If the draft exceeds this range, install a barometric damper.
TABLE - 2B
DIRECTAIRE KITS
MODEL HORIZONTAL KIT* VERTICAL KIT*
502 SVK3047 VDK3026
652 SVK3048 VDK3027
752 SVK3048 VDK3027
992 SVK3040 VDK3023
1262 SVK3041 VDK3024
1442 SVK3041 VDK3024
1802 SVK3041 VDK3024
2072 SVK3041 VDK3024
*The SVK kits include a DV box adapter and sidewall air inlet cap. The VDK kits include a DV box adapter and a rooftop air inlet cap.
21
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