Lochinvar COPPER-FIN II CF401 User manual

DESIGNER’S GUIDE COPPER-FIN II®WATER HEATER
400,000 – 2,070,000 Btu/hr

Dear Specifier/Project Manager,
At Lochinvar, we have long recognized the importance of innovation to any
product or service. Those who enter into business must also accept the challenge
of meeting constantly changing needs.
The designer’s guide you are now holding has been designed to make it more
convenient for you to select the perfect Lochinvar water heater for your projects
and provide correct specifications for your teams.
All information has been organized and presented in a succinct, easy-to-use
manner, so you can use and share information confidently and with minimal
effort.
However, it is important to remember that this guide is not intended to replace our
installation manual. Installers should still refer to our installation manual for
specific installation instructions.
We hope this manual will make your work easier and more productive. As always,
we greatly appreciate your input on additional improvements for the future.
Thanks once again for specifying the Lochinvar family of quality standard
and custom-built water heaters and boilers.
Sincerely,
Lochinvar Corporation
Nashville, TN • 615-889-8900 • Fax: [phone]

Lochinvar DESIGNER’S GUIDE COPPER-FIN II WATER HEATER 615-889-8900 1
Codes . . . . . . . . . . . . . . . . . . . . . . . . .2
Combustion & Ventilation Air . . . . . . . . .6
Contaminants . . . . . . . . . . . . . . . . . . . .7
Determining Total “Free Area” . . . . . . . .7
Electrical Requirements . . . . . . . . . . . .20
Gas Supply . . . . . . . . . . . . . . . . . . . .17
General Venting . . . . . . . . . . . . . . . . . .7
Location of Unit . . . . . . . . . . . . . . . . . .2
Low Water Temperature Delivery . . . . .18
Outdoor Use . . . . . . . . . . . . . . . . . . . .4
Outdoor Installation . . . . . . . . . . . . . .16
Pump Operation . . . . . . . . . . . . . . . . .19
Relief Valve . . . . . . . . . . . . . . . . . . . .20
Venting Options . . . . . . . . . . . . . . . . . .9
Water Connections . . . . . . . . . . . . . . .18
Water Treatment . . . . . . . . . . . . . . . . .19
Water Velocity Control . . . . . . . . . . . .19
Figures & Tables Index
FIG. 1 Models CF 991-2071
Requirements For Installation
Over Combustible Floor . . . . .3
FIG. 2 Models CF 401-751
Special Combustible
Floor Base . . . . . . . . . . . . . . .4
FIG. 3 Water Heater Equipment
& Control Orientation . . . . . . .5
FIG. 4-7 Combustion &
Ventilation Air . . . . . . . . . . .6,7
FIG. 8 Barometric Damper
Installation . . . . . . . . . . . . . . .9
FIG. 9 Multiple Unit Barometric
Damper Installation . . . . . . .10
FIG. 10 Powered Sidewall Venting
(Powered Vent Cap Shown) . . .10
FIG. 11 Powered DirectAire Horizontal
(Powered Vent Cap Shown) . . .11
FIG. 12 Vertical Vent & Air Inlet . . . . .13
FIG. 13 Vertical Vent & Sidewall
Air Inlet . . . . . . . . . . . . . . . .13
FIG. 14 Aire-Lock Direct Vent . . . . . . .14
FIG. 15 Sidewall Vent . . . . . . . . . . . .15
FIG. 16 Outdoor Venting . . . . . . . . .16
TABLE A. Combustible Floor Kits . . . . . . .3
TABLE B. Clearances From
Combustibles . . . . . . . . . . . . .4
TABLE C. Flue Sizes & Inlet
Air Pipe Sizes . . . . . . . . . . . .9
TABLE D. Powered Sidewall Vent Kits . .11
TABLE E. Power DirectAire® Horizontal
Vent Kits . . . . . . . . . . . . . . .12
TABLE F. DirectAire Vertical Air
Inlet Kits . . . . . . . . . . . . . . .14
TABLE G. Direct Vent Kits . . . . . . . . . . .15
TABLE H. Sidewall Vent Kits . . . . . . . . .16
TABLE I. Outdoor Kits . . . . . . . . . . . .17
TABLE J. Gas Supply Pipe Sizing . . . .17
TABLE K. Inlet Gas Pressure . . . . . . . . .18
TABLE L. Required Temperature Rise . .19
TABLE M. Required Pump Performance .19
TABLE N. Common Water
Manifold Sizes . . . . . . . . . . .20
TABLE O. Amp Draw . . . . . . . . . . . . .20
Water Heater Piping Diagrams
Single Heater – Single Tank . . . . . . . . .A1
Single Heater – Two Tanks . . . . . . . . .A2
Two Temperature Installation
Single Heater – Single Tank . . . . . . . . .A3
Two Heaters – Single Tank . . . . . . . . .A4
Two Heaters – Two Tanks . . . . . . . . . .A5
Multi-Stack Frame
Two Heaters Single Tank . . . . . . . . . . .A6
Table of Contents

CODES
The equipment shall be installed in
accordance with those installation
regulations in effect 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.
Where required by the authority having
jurisdiction, the installation must conform to
American Society of Mechanical Engineers
Safety Code for Controls and Safety Devices
for Automatically Fired Boilers, ASME CSD-1.
Where required by the authority having
jurisdiction, the installation must comply with
the Canadian Association Code, CAN/CGA-
B149.1 and/or B149.2 and/or local codes.
LOCATION OF UNIT
Locate the unit 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
air flow.
2Lochinvar DESIGNER’S GUIDE COPPER-FIN II WATER HEATER 615-889-8900
1.
Lochinvar
oWater Velocity
(See page 19 for Required
Temperature Rise chart.)
oFactory Supplied Pump
Capacity
(See page 19 for Pump Operation.)
oManifold Pipe Size
When using more than one heater
(See page 20 for Common Water
Manifold Size for Multiple Water
Heater Installation Table.)
oStorage Tank Circulating
Tappings
(See page 20 for Manifold Pipe
Size.)
oPlacement of Cold Water
Inlet and Building Return
(See Pages Appendix A for Water
Heater Piping Diagrams.)
o Water Hardness
(See page 19 for Water Treatment
Information.)
In designing
a water heater system,
pay special attention to:

The indoor units 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.).
The appliance must be installed
on a level, non-combustible floor.
Concrete over wood is not considered a
non-combustible floor. Maintain required
clearances from combustible surfaces.
For installation on a combustible
floor only when installed on
special base: Units installed over a
combustible floor MUST use the Special
Combustible Floor Base. The unit must be
centered on the base as shown in FIG. 1.
• Provide a base of hollow clay tile or
concrete blocks from 8”to 12”thick
and extending 24”beyond the sides.
• The blocks must be placed in line so
that the holes line up horizontally to
provide a clear passage through the
blocks.
• This procedure should also be
followed if electrical conduit or
radiant heat distribution piping
runs through the floor and
beneath the appliance.
• Ensure that combustible floor base
meets local fire code requirements.
• The correct kit number for the required base
is noted on the rating plate of each unit
and listed in Table A.
2.
3.
4.
Lochinvar DESIGNER’S GUIDE COPPER-FIN II WATER HEATER 615-889-8900 3
(FIG. 1) CF 991-2071 REQUIREMENTS FOR
INSTALLATION OVER COMBUSTIBLE FLOOR
(TABLE A)
COMBUSTIBLE FLOOR KITS
MODEL NUMBER KIT NUMBER
CF401 CFK3301
CF501 CFK3302
CF651 CFK3303
CF751 CFK3304
Under no circumstances is the
manufacturer to be held responsible
for water damage in connection
with this unit or any of its
components.

4Lochinvar DESIGNER’S GUIDE COPPER-FIN II WATER HEATER 615-889-8900
Outdoor models require the installation of
an optional vent cap. Instructions for
placement of the vent cap are included in
the venting section.
Outdoor models must not be installed
directly on the ground. The outdoor unit
must be installed on a concrete brick,
block or other non-combustible pad.
Outdoor models have additional special
location and clearance requirements.
(See Outdoor Venting Pg. 16)
SPECIAL LOCATION:
OUTDOOR USE
Outdoor models have additional location
and clearance requirements. These
requirements must be adhered to carefully,
since wind, rain, snow and cold cannot be
controlled in outdoor applications. See
Outdoor Installation, in the venting
section on page 16.
Lochinvar
5.
(FIG. 2) MODELS CF 401-751 INSTALLED WITH
OPTIONAL COMBUSTIBLE FLOOR BASE
(TABLE B) – CLEARANCES FROM COMBUSTIBLES
CLEARANCES CF 401-751 CF 991-2071
Right Side 1”3”
Rear 1”3”
Left Side 6”3”
(24”for Service) (24”for Service)
Front ALCOVE* ALCOVE*
(24”for Service) (30”for Service)
Top 1”3”
Flue 1”** 1”**
Hot Water Pipes 1”1”
* Alcove is a closet without a door.
** Consult local codes and/or vent manufacturer.

Lochinvar DESIGNER’S GUIDE COPPER-FIN II WATER HEATER 615-889-8900 5
(FIG. 3) WATER HEATER EQUIPMENT AND CONTROL ORIENTATION.
OPERATOR INTERFACE
PANEL
GAS
CONNECTION
DRAIN
LEFT SIDE
OPERATOR INTERFACE
PANEL
BURNER INSPECTION PORT
FRONT
AIR INLET
HOT WATER
OUTLET
COLD WATER
INLET
FLUE PRODUCTS VENT
120V ELECTRICAL
CONNECTION
TERMINAL
STRIP
CF401-751
CF991-2071
FLUE PRODUCTS VENT
GAS CONNECTION
TERMINAL STRIP
DRAIN
BURNER INSPECTION PORT
LEFT SIDE
FRONT
COLD WATER INLET
HOT WATER OUTLET
AIR INLET
BACK

6Lochinvar DESIGNER’S GUIDE COPPER-FIN II WATER HEATER 615-889-8900
COMBUSTION & VENTILATION AIR
Provisions for combustion and ventilation air
must be in accordance with Section 5.3,
Air for Combustion and Ventilation, of the
latest edition of the National Fuel Gas
Code, ANSI Z223.1; in Canada, the latest
edition of CGA Standard B149 Installation
Code for Gas Burning Appliances and
Equipment; or applicable provisions of the
local building codes.
The equipment room must be provided with
properly sized openings to assure adequate
combustion air and proper ventilation when
the unit is installed with conventional venting
or sidewall venting.
If air is taken directly from outside
the building with no duct, provide two
permanent openings:
A. Combustion air opening with a
minimum free area of one square inch per
4000 Btu input (5.5cm2per kW).
This opening must be located within 12”
(30 cm) of the bottom of the enclosure.
B. Ventilation air opening with a minimum
free area of one square inch per 4000
Btu input (5.5cm2per kW). This opening
must be located within 12”(30cm) of the
top of the enclosure.
If combustion and ventilation air is
taken from the outdoors using a
duct to deliver the air to the
mechanical room, each of the two
openings should be sized based on a
minimum free area of one square inch
per 2000 Btu input (11cm2per kW).
If air is taken from another interior
space, each of the two openings
specified above should have a net free
Lochinvar
1.
2.
3.
EXAMPLE OF
SIZING FOR
COMBUSTION
& VENTILATION
AIR OPENINGS
(WATER HEATER
WITH 2,070,000
Btu/hr INPUT):
When combustion and
ventilated air is taken
from directly outside the
building (FIG. 4), divide
the total BTU’s by 4,000.
This yields 517.5 sq.in.
of “Free Area” without
restriction.
(2,070,000 ÷ 4000 =
517.5 sq.in.)
Since the air opening is
50% closed due to
screens and louvers, the
total opening must be
multiplied by 2.
(517.5 sq. in. x 2 =
1,035 sq.in.)
This project requires one
Ventilation Air Opening
with net “Area” of
1,035 square inches with
louver dimensions of 30”
x 35”and one
Combustion Air Opening
with net “Area” of
1,035 square inches with
louver dimensions
of 30”x 35”.
(FIG. 4) COMBUSTION AIR DIRECT FROM OUTSIDE
(FIG. 5) COMBUSTION AIR THROUGH DUCTWORK
(FIG. 6) COMBUSTION AIR FROM AN
INTERIOR SPACE
CAUTION: Under no circumstances should
the equipment room be under a negative
pressure when atmospheric combustion
equipment is installed in the room.

area of one square inch for each 1000
Btu (22cm2per kW) of input, but not less
than 100 square inches (645 cm2).
If a single combustion air opening
is provided to bring combustion
air in directly from the outdoors,
the opening must be sized based on a
minimum free area of one square inch
per 3000 Btu input (7cm2per kW). This
opening must be located within 12”
(30cm) of the top of the enclosure.
CONTAMINANTS
Combustion air drawn from an interior
or exterior space must be free of any
chemical fumes which could be corrosive to
the water heater.
Burning chemical fumes results in the
formation of corrosive acids which attack the
water heater, cause improper combustion
and premature failure of the water heater
and vent.
These fumes are often present in areas
where refrigerants, salts, and solvents are
used. Therefore, be aware of swimming
pool equipment, water softening, and
cooling system placement.
VENTING
General
These water heaters are classified as
Category I appliances when tested to the
latest ANSI Standard. This classification
requires all conventionally vented
combustion products to be vented using
Category I listed vent pipe.
Additionally, it is recommended that this vent
material be double wall construction or
insulated in the field. A Category I
appliance operates with a non-positive static
vent pressure and with flue loss greater than
17 percent.
Vent installations for connection to gas vents
or chimneys must be in accordance with
Part 7, “Venting of Equipment,” of the latest
edition of the National Fuel Gas Code, ANSI
Z223.1, or applicable provisions of the local
building codes.
The connection from the appliance vent
to the stack must be as direct as possible
and sized correctly. The horizontal breeching
of a vent must have at least 1/4”rise per
linear foot. The horizontal portions should
also be supported for the design and weight
of the material employed to maintain
clearances, prevent physical damage and
separation of joints.
The connection from the appliance vent
to the stack or vent termination outside the
building must be made with listed
Lochinvar DESIGNER’S GUIDE COPPER-FIN II WATER HEATER 615-889-8900 7
4.
(FIG. 7) COMBUSTION AIR FROM OUTSIDE,
SINGLE OPENING
CAUTION!
EXHAUST FANS:
Any fan or equipment
which exhausts air
from the equipment
room may deplete the
combustion air supply
and/or cause a down
draft in the venting
system. If a fan is used
to supply combustion
air to the equipment
room, it must by sized
such to make sure that
it does not cause drafts
which could lead to
nuisance operational
problems with the
water heater.

8Lochinvar DESIGNER’S GUIDE COPPER-FIN II WATER HEATER 615-889-8900
Category I double wall vent (or equivalent)
connectors and sized according to vent
sizing tables (FAN column) in the latest
edition of the National Fuel Gas Code.
The Category I vent and accessories, such as
firestop spacers, thimbles, caps, etc., must
be installed in accordance with the vent
manufacturer’s listing. The vent connector and
firestop must provide correct spacing to
combustible surfaces and seal to the vent
connector on the upper and lower sides of
each floor or ceiling through which the vent
connector passes.
Any improper operation of the common
venting system in an existing building should
be corrected when new equipment is
installed, so the installation conforms to the
latest edition of the National Fuel Gas Code,
ANSI Z223.1.
When resizing any portion of the common
venting system, it should be resized to
approach the minimum size as determined
using the appropriate tables in the National
Fuel Gas Code.
The weight of the venting system must not
rest on the water heater. The venting system
must be adequately supported in
compliance with local codes and other
applicable codes.
Vent Terminations
The vent terminal should be vertical and
exhaust outside the building at least 2 feet
(0.6m) above the highest point of the roof
when within a 10 foot (3.05m) radius.
Additionally, vertical terminations must be a
minimum of 3 feet (0.9m) above the roof line,
and when less than 10 feet (3.05m) from a
parapet wall must be a minimum of 2 feet
(0.61m) higher than the parapet wall.
Vent caps should have a minimum clearance
of 4 feet (1.2m) horizontally from, and in no
case above or below [unless a 4 feet (1.2m)
horizontal distance is maintained], electric
meters, gas meters, regulators and relief
equipment.
Maintain a distance of at least 3 feet (0.9m)
above any forced air inlet within 10 feet
(3.05m) and a distance of at least 4 feet
(1.2m) below, 4 feet (1.2m) horizontally
from, or 1 foot (30cm) above any door,
window or gravity air inlet.
Do not terminate the vent in a window well,
stairwell, alcove, courtyard or other recessed
area. The vent can not terminate
below grade. The bottom of the vent
terminal shall be located at least 12 inches
(30cm) above grade and clear of snow, ice,
leaves or other debris.
The distance of the vent terminal from
adjacent public walkways, adjacent
buildings, windows, and building openings
Lochinvar

must be consistent with the National Fuel
Gas Code Z223.1 or in Canada, the latest
edition of CGA Standard B149 Installation
Code for Gas Burning Appliances and
Equipment.
VENTING OPTIONS
Conventional Venting
A conventional venting system utilizes
the natural buoyancy of the heated flue
products to generate a negative draft. This
draft forces flue products to rise vertically
through a rooftop flue termination. The vent
connection is made directly to the top of the
unit and combustion air supplied from the
mechanical room. Properly sizing vent
material and the use of a barometric
damper (when required) will lead to proper
vent operation.
A barometric damper is required when draft
exceeds 0.08 inches of negative water
column. When installed and adjusted
properly, a barometric damper will maintain
draft between 0.02 and 0.08 inches of
negative water column ensuring proper
operation.
The minimum flue pipe diameters for all
models, utilizing negative draft venting are
as follows:
Size vent material using the “FAN” category
of vent sizing tables in the latest edition of
the National Fuel Gas Code. “FAN” applies
to fan-assisted combustion appliances in
Category I.
Multiple unit installations with combined
venting also require barometric dampers to
regulate draft at each unit. Again, the
negative draft must be within the range of
0.02 to 0.08 inches of negative water
column to ensure proper operation.
Lochinvar DESIGNER’S GUIDE COPPER-FIN II WATER HEATER 615-889-8900 9
NOTE:
Flue gases will form a
white plume in winter.
Plume could obstruct
window view. Flue gas
condensate can freeze
on exterior surfaces or
on the vent cap. Flue
gas condensate can
cause discoloration of
exterior building
surfaces. Adjacent brick
or masonry surfaces
should be protected with
a rust resistant sheet
metal plate.
(FIG. 8) BAROMETRIC DAMPER INSTALLATION
(TABLE C)
FLUE SIZES AND INLET AIR PIPE SIZES
MODEL FLUE SIZE DIRECTAIRE
NUMBER INLET SIZE
CF401 6
”
6
”
CF501 6
”
6
”
CF651 8
”
8
”
CF751 8
”
8
”
CF991 10
”
10
”
CF1261 12
”
12
”
CF1441 12
”
12
”
CF1801 14
”
12
”
CF2071 14
”
12
”
NOTE:
A vent system should
never be sized based
only on the vent
connection diameter of
the appliance. For proper
vent design and sizing,
please consult the
National Fuel Gas Code
(ANSI Z223.1).

10 Lochinvar DESIGNER’S GUIDE COPPER-FIN II WATER HEATER 615-889-8900
For this type of installation, it is best to use a
draft control for each water heater located
on the riser between the vent outlet and the
breeching - Location “A”. When this riser is
too short to permit the installation of a draft
control, locate a separate control for each
water heater on the main breeching as
illustrated in Location “B”. If, because of
general crowding or other reasons, neither
of these locations are possible, use a single
large control in the breeching between the
water heater nearest the chimney and the
chimney, as shown in Location “C”.
All draft readings are made while unit is in
stable operation (approximately 5 minutes
running time).
Masonry Chimney
A masonry chimney must be properly sized
for the installation of a high efficiency gas
fired appliance. 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 of the
masonry flue/tile, insufficient draft and
possible spillage of flue products into an
occupied living space.
Carefully inspect all chimney systems during
the project design phase. If there is any doubt
about the sizing or condition of a masonry
chimney, it is prudent to reline the chimney
with a properly sized and approved chimney
liner system. Metallic liner systems (Type “B”
doublewall 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.
Powered Sidewall Venting
This venting system uses a powered
vent cap assembly which pulls the flue products
out of the stack. The fan in the powered vent
cap generates a negative draft at the unit.
Combustion air is drawn from the mechanical
room (See Combustion and Ventilation Air
Requirements, page 6).
Lochinvar
(FIG. 9) MULTIPLE UNIT BAROMETRIC
DAMPER INSTALLATION
(FIG. 10) POWERED SIDEWALL VENTING
(POWERED VENT CAP SHOWN)
NOTE:
Venting of a high
efficiency appliance into
a cold or oversized
masonry chimney can
result in operational and
safety problems.
NOTE:
Common venting
systems may be too
large when an existing
unit is removed. Be
careful to resize any
common venting system
when new appliances
are installed or existing
appliances are replaced.

Powered Sidewall Vent Kits
Models CF401-751 utilize a powered vent cap
which has a fan mounted inside the cap. The
powered vent cap must be placed on an
exterior wall. The powered sidewall vent cap
and accessories are included in a venting kit,
which must be furnished by Lochinvar in
accordance with CSA International requirements.
This venting kit includes the powered sidewall
fan/cap, proving switch and all necessary relays
to interlock with the water heater control system.
Models CF991-2071 utilize an inline fan, which
is positioned on the inside of the sidewall and
connected to a vent hood mounted on the
sidewall exterior. The inline fan and accessories
are included in a venting kit, which must be
furnished by Lochinvar in accordance with CSA
International requirements.
This venting kit includes the inline fan, exterior
vent hood, a tapered vent adapter, barometric
damper, proving switch and all necessary relays
to interlock with the water heater control system.
The connection from the vent to the sidewall
fan/powered vent cap must be made with
listed Type “B” double wall (or equivalent) vent
and accessories. The installer supplies this vent
pipe material.
For models CF401-751, maximum total
equivalent length of the vent pipe cannot
exceed 50 equivalent feet (15.24m).
Models CF991-2071 allow a maximum
total equivalent length of 100 feet (30.48m).
Subtract 5 feet (1.52m) for each elbow in the
vent.
Power DirectAire® Horizontal
This vent system requires the installation of
two vent pipes directly to the unit, one pipe
for flue products and one for combustion air.
Both vent pipes are installed horizontally with
a sidewall termination point. The vent
connection is made directly to the top of the unit
and utilizes either the powered vent cap or inline
fan as described in the side wall venting section
(Pages 10-11).
Lochinvar DESIGNER’S GUIDE COPPER-FIN II WATER HEATER 615-889-8900 11
(TABLE D) POWERED SIDEWALL VENT KIT PART NUMBERS
MODEL FLUE SIZE* SIDEWALL VENT
NUMBER CAP KIT
CF401 6
”
SVK3006
CF501 6
”
SVK3006
CF651 8
”
SVK3008
CF751 8
”
SVK3008
CF991 10
”
SVK3009
CF1261 12
”
SVK3010
CF1441 12
”
SVK3010
CF1801 14
”
SVK3012
CF2071 14
”
SVK3012
(FIG. 11) POWER DIRECTAIRE®HORIZONTAL
(POWERED VENT CAP SHOWN)
3’
12”

The combustion air supply system has specific
vent material and installation requirements.
The air inlet pipe connects directly to the
water heater to supply combustion air. The
combustion air inlet pipe will be a dedicated
system with one air inlet pipe per water
heater. The air inlet pipe must be connected
to a combustion air inlet cap.
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 the following instructions:
The combustion air inlet cap must be installed
at least 1 foot (0.30m) above ground level and
above normal snow levels.
The point of termination for the combustion air
inlet cap must be at least 3 feet (0.91m) below
the point of flue gas termination if it is located
within 10 feet (3.05m) of the flue outlet.
The combustion air inlet cap must not be
installed closer than 10 feet (3.05m) from an
inside corner of an L-shaped structure.
Both the combustion air inlet cap and the
powered vent cap/inline fan vent hood must
be installed on the same wall and in the same
pressure zone.
The Horizontal DirectAire system requires
installation of a single wall pipe to supply
combustion air from outdoors directly to the
water heater. The use of double wall vent
material is recommended in cold climates to
prevent the condensation of airborne moisture.
For models CF401-751, maximum total
equivalent length of the vent pipe and
combustion air inlet pipe cannot exceed
50 equivalent feet (15.24m). Models
CF991-2071 allow a maximum total equivalent
length of 100 feet (30.48m)
for each pipe. Subtract 5 feet (1.52m)
for each elbow in the vent.
Power DirectAire®Horizontal Kits
Models CF401-751 vent kit includes the
powered sidewall fan/cap, proving switch, air
inlet cap and all necessary relays to interlock
with the water heater control system. Lochinvar
must furnish this vent kit in accordance with
CSA International requirements.
Models CF991-2071 vent kit includes the inline
fan, exterior vent hood, a tapered vent adapter,
barometric damper, proving switch, air inlet cap
and all necessary relays to interlock with the
water heater control system. Lochinvar must
furnish this vent kit in accordance with CSA
International requirements.
The installer supplies all vent pipe
material.
Lochinvar
12 Lochinvar DESIGNER’S GUIDE COPPER-FIN II WATER HEATER 615-889-8900
(TABLE E) POWER DIRECTAIRE
®
HORIZONTAL
KIT PART NUMBERS
MODEL FLUE SIZE DIRECT AIR HORIZONTAL
NUMBER INLET SIZE DIRECTAIRE KIT
CF401 6
”
6
”
HDK3031
CF501 6
”
6
”
HDK3031
CF651 8
”
8
”
HDK3032
CF751 8
”
8
”
HDK3032
CF991 10
”
10
”
HDK3026
CF1261 12
”
12
”
HDK3027
CF1441 12
”
12
”
HDK3027
CF1801 14
”
12
”
HDK3028
CF2071 14
”
12
”
HDK3028

DirectAire® Vertical
This vent system requires the installation of two
pipes directly to the unit, one vertical pipe with
a roof top termination for the flue products and
one pipe for combustion air. The combustion
air pipe may terminate horizontally with a
sidewall air inlet or vertically with a roof top
air inlet. Vent connection is made directly to
the top of the unit.
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 of
negative water column. The flue may be
combined with the vent from any other
negative draft, Category I appliances.
Multiple unit installations common vented
with other negative draft appliances require
that each water heater must have a
barometric damper. The common vent and
connectors from multiple water heaters must
be sized per the requirements of the venting
tables for Type “B” double wall vents in the
latest edition of the National Fuel Gas Code,
ANSI Z223.1.
The air inlet pipe connects directly to the
water heater to supply combustion air. The
maximum distance for the air inlet pipe is 50
equivalent feet. Subtract 5 feet (1.52m) for
each elbow in the air inlet pipe.
Single wall vent material is used to supply
the combustion air to each unit. The use of
double wall vent material is recommended
in cold climates to prevent the condensation
of airborne moisture.
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 instructions in
this manual.
The combustion air inlet cap must be
installed at least one foot (0.30m) above
ground level and above normal snow levels.
The point of termination for the combustion air
inlet cap must be at least 3 feet (0.91m)
below the point of flue gas termination (vent
cap), if it is located within 10 feet (3.05m) of
the flue outlet.
Lochinvar DESIGNER’S GUIDE COPPER-FIN II WATER HEATER 615-889-8900 13
EXAMPLE OF
COMBINED AIR
INLET SIZING
Two 8”air inlet pipes
(50.3 in2area each) have
a total area of 100.6 in2
and will require a 12”
(113.1 in2area) common
air inlet pipe.
NOTE:
The use of double wall
vent material for the
combustion air inlet pipe
is recommended in cold
climates to prevent the
accumulation of
condensation on the pipe
exterior.
CAUTION!
Water heaters which
are shut down or will
not operate may
experience freezing due
to convective air flow in
the air inlet pipe
connected to the unit.
Proper freeze
protection must be
provided.
(FIG. 12) VERTICAL VENT AND AIR INLET
3’
12”
(FIG. 13) VERTICAL VENT AND SIDEWALL AIR INLET

14 Lochinvar DESIGNER’S GUIDE COPPER-FIN II WATER HEATER 615-889-8900
The combustion air inlet cap must not be
installed closer than 10 feet (3.05m) from an
inside corner of an L-shaped structure.
The vertical air inlet point for the combustion
air inlet cap must be installed at least one
foot (0.30m) above the rooftop and above
normal snow levels. Lochinvar is required to
supply a vent kit for DirectAire applications.
Each kit includes either a sidewall or roof top
combustion air inlet cap to supply air to a
single water heater (See Table F, Page 14).
Aire-LockTM Direct Vent
This vent system utilizes the internal blower of
the unit to draw all combustion air from
outside and vent the by-products of
combustion to the outdoors. This vent system
requires the installation of two vent pipes
directly to the unit, one pipe for flue products
and one pipe for combustion air. Both vent
pipes can terminate horizontally at a sidewall
or vertically at the rooftop. It is a requirement
that both vent pipes terminate in the same
pressure zone. The vent system has specific
vent material and installation requirements.
The vent piping for flue products uses AL29-
4C vent material and must be sealed “gas-
tight” at all vent joints. The vent connection is
made directly to the top of the unit. The
maximum distance for the flue pipe is 50
equivalent feet (15.2m). Subtract 5 feet
(1.52m) for each elbow in the flue pipe.
The flue products vent pipe is a dedicated
system with one flue pipe per unit.
The combustion air supply pipe connects
directly to the unit to supply combustion air.
The maximum distance for the air inlet pipe is
50 equivalent feet (15.2m). Subtract 5 feet
(1.52m) for each elbow in the air inlet pipe.
Lochinvar
(TABLE F)
DIRECTAIRE VERTICAL SIDEWALL & ROOFTOP AIR INLET KITS
MODEL NUMBER VENT SIZE AIR INLET SIDEWALL AIR ROOFTOP AIR
SIZE* INLET KIT INLET KIT
CF401 6”6”SVK3047 VDK3026
CF501 6”6”SVK3047 VDK3026
CF651 8”8”SVK3048 VDK3027
CF751 8”8”SVK3048 VDK3027
CF991 10”10”SVK3040 VDK3023
CF1261 12”12”SVK3041 VDK3024
CF1441 12”12”SVK3041 VDK3024
CF1801 14”12”SVK3041 VDK3024
CF2071 14”12” SVK3041 VDK3024
(FIG. 14) AIRE-LOCK DIRECT VENT

The combustion air inlet pipe is a dedicated
system with one air inlet pipe per unit. The air
inlet pipe must be connected to the Direct Vent
(DV) box adapter. The air inlet pipe must be
sealed.
Aire-LockTM Horizontal Direct Vent Kits
The vent kit includes a DV box adapter; sidewall
air inlet cap and sidewall vent termination.
Lochinvar must furnish this vent kit in accordance
with CSA International requirements.
Vertical Direct Vent Termination
You must use the vent termination
recommended by the vent manufacturer for
vertical direct vent terminations.
The installer supplies all vent pipe
material.
The combustion air inlet cap must be
installed at least 1 foot (0.30m) above
ground level and above normal snow levels.
The point of termination for the combustion air
inlet cap must be at least 3 feet (0.91m)
below the point of flue gas termination if it is
located within 10 feet (3.05m) of the flue outlet.
The combustion air inlet cap must not be
installed closer than 10 feet (3.05m) from an
inside corner of an L-shaped structure.
Both the combustion air inlet cap and the flue
gas vent termination must be installed in the
same pressure zone.
Sidewall Vent
This vent system utilizes the internal blower of
the unit to vent the by-products of combustion
to the outdoors. This vent system requires the
installation of one pipe for flue products. The
vent pipes terminates horizontally at a
sidewall. The vent system has specific vent
material and installation requirements. The
vent piping for flue products uses AL29-4C
vent material and must be sealed "gastight"
at all vent joints. The vent connection is made
directly to the top of the unit. The maximum
distance for the flue pipe is 50 equivalent feet
(15.2m). Subtract 5 feet (1.52m) for each
elbow in the flue pipe. The flue products vent
pipe is a dedicated system with one flue pipe
per unit.
Sidewall Vent Kits
The vent kit includes a sidewall vent
termination assembly to provide pressure
equalization. Lochinvar must furnish this
vent kit in accordance with CSA
International requirements.
Lochinvar DESIGNER’S GUIDE COPPER-FIN II WATER HEATER 615-889-8900 15
(TABLE G)
AIRE-LOCK DIRECT VENT KIT PART NUMBERS
MODEL FLUE AIR PART
NUMBER SIZE INLET SIZE NUMBER
CF401 6
”
6
”
DVK3004
CF501 6
”
6
”
DVK3004
CF651 8
”
8
”
DVK3005
CF751 8
”
8
”
DVK3005
CF991 10
”
10
”
DVK3000
CF1261 12
”
12
”
DVK3001
CF1441 12
”
12
”
DVK3001
CF1801 14
”
12
”
DVK3002
CF2071 14
”
12
”
DVK3002
(FIG. 15) SIDEWALL VENT

16 Lochinvar DESIGNER’S GUIDE COPPER-FIN II WATER HEATER 615-889-8900
Lochinvar
The installer supplies all vent pipe
material.
Combined Air Inlet Points
In most installations, the combustion air inlet
pipe will be a dedicated system with one air
inlet pipe per water heater.
Multiple air inlets may 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.
The air inlet point for multiple water 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
(15.25m) equivalent feet. Subtract 5 feet
(1.52m) for each elbow in the air inlet pipe.
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.
OUTDOOR INSTALLATION
Units are self venting and can be used
outdoors when installed with the optional
Outdoor Cap. This cap mounts directly to the
top of the water heater and covers the flue
outlet and combustion air inlet openings on the
jacket. No additional vent piping is required.
Maintain a minimum clearance of 3”(76 mm)
to combustible surfaces and a minimum of 3”
(76 mm) clearance to the air inlet.
An outdoor unit should not be located so
that high winds can deflect off of adjacent
walls, buildings or shrubbery causing
recirculation. Recirculation of flue products
may cause operational problems, bad
combustion or damage to controls. The unit
should be located at least 3 feet (0.91m)
from any wall or vertical surface to prevent
adverse wind conditions from affecting
performance.
Multiple unit outdoor installations require
48”(1.22m) clearance between each vent
cap. The outdoor cap must be located 4
feet (1.22m) below and 4 feet (1.22m)
horizontally from any window, door,
walkway or gravity air intake.
(FIG. 16) OUTDOOR VENTING
(TABLE H)
SIDEWALL VENT KIT PART NUMBERS
MODEL FLUE PART
NUMBER SIZE NUMBER
CF401 6
”
SVK3043
CF501 6
”
SVK3043
CF651 8
”
SVK3044
CF751 8
”
SVK3044
NOTE:
Some discoloration
to building exterior
or unit surfaces
can be expected.
Adjacent brick or
masonry surfaces
should be protected
with a rust resistant
sheet metal plate.
NOTE:
Outdoor models must
have an optional
vent cap and air inlet
shield installed.

The combustion air inlet of the outdoor cap
must be located at least one foot (0.30m)
above grade and above normal snow levels.
The water heater must be at least 10 feet
(3.05m) away from any forced air inlet and
at least 3 feet (0.91m) outside any overhang.
Do not install in locations where rain from
building runoff drains will spill onto the
water heater.
Lochinvar must furnish an outdoor vent kit
in accordance with CSA international
requirements. Each kit includes the flue
outlet/combustion air inlet, assembly, gasket
and pump cover.
Freeze Protection-
Outdoor Installation
A snow screen should be installed to prevent
snow and ice accumulation around the
appliance or its venting system.
If for any reason the unit is to be shut off:
(a.) Shut off water supply.
(b.) Drain unit completely.
(c.) Drain pump and piping.
If freeze protection is not provided for the
system, a low ambient temperature alarm or
automatic drain system is recommended.
GAS SUPPLY
The gas pressure regulator supplied is for
low pressure service. If upstream pressure
exceeds 6 oz. (10.5" water column), an
intermediate gas pressure regulator, of the
lock up type, must be installed.
The gas line should be a separate line
direct from meter, unless the existing
gas line is of sufficient capacity. Verify
pipe size with your gas supplier.
Lochinvar DESIGNER’S GUIDE COPPER-FIN II WATER HEATER 615-889-8900 17
(TABLE I) - OUTDOOR VENT KIT PART NUMBERS
MODEL
NUMBER PART NUMBER
CF401 0DK3052
CF501 0DK3052
CF651 0DK3053
CF751 ODK3053
CF991 ODK3049
CF1261 ODK3050
CF1441 ODK3050
CF1801 ODK3051
CF2071 ODK3051
(TABLE J) – GAS SUPPLY PIPE SIZING
Length of Pipe In Straight Feet
Nominal Iron
Pipe Size, Inches 10 20 30 40 50 60 70 80 90 100 125 150 175 200
369 256 205 174 155 141 128 121 113 106 95 86 79 74
697 477 384 328 292 267 256 246 210 200 179 164 149 138
1,400 974 789 677 595 543 502 472 441 410 369 333 308 287
2,150 1,500 1,210 1,020 923 830 769 707 666 636 564 513 472 441
4,100 2,820 2,260 1,950 1,720 1,560 1,440 1,330 1,250 1,180 1,100 974 871 820
6,460 4,460 3,610 3,100 2,720 2,460 2,310 2,100 2,000 1,900 1,700 1,540 1,400 1,300
11,200 7,900 6,400 5,400 4,870 4,410 4,000 3,800 3,540 3,300 3,000 2,720 2,500 2,340
23,500 16,100 13,100 11,100 10,000 9,000 8,300 7,690 7,380 6,870 6,150 5,640 5,130 4,720
Maximum capacity of pipe in thousands of BTU’s per hour for gas pressures of 14” Inches Water Column (0.5 PSIG) or less and a total
system pressure drop of 0.05 Inch Water Column (Based on NAT GAS, 1025 BTU’s per Cubic Foot of Gas and 0.60 Specific Gravity).
11 /4
3
/4
11 /2
1
21
/2
31 /2
3
2
1.
2.

A trap (drip leg) should be provided in the
inlet gas connection to the water heater.
A manual main gas shutoff valve is
provided outside the jacket, upstream
of the main gas valve.
In Canada, derated10% from 2,000 -
4,500 ft., over 4,500 ft. derate must be
in accordance with local authorities.
Consult factory for installations at
higher elevations.
High Altitude Applications
Atmospheric pressure decreases as the
height above sea level increases. At any
altitude above sea level, a cubic foot will
contain less gas than a cubic foot at sea
level. Thus, the heating value of a cubic foot
of fuel gas will decrease as height above
sea level increases.
Specific gravity of a gas with respect to sea
level also decreases with altitude. These
changes in heating value and specific
gravity tend to offset each other.
However, as elevation above sea level is
increased, there is less oxygen per cubic foot
of air. Therefore, heat input rate should be
reduced in an appliance above 2000 feet.
Ratings should be reduced at the rate of 4
percent for each 1000 feet above sea level.
WATER CONNECTIONS
Inlet and Outlet Water Connections
For ease of service, install unions on inlet and
outlet of the water heater.
The connection on the unit marked “Inlet”
should be used for return water from the
storage tank. The connection on the header
marked “Outlet” should be connected to the
inlet of the storage tank. (See Appendix A for
Water Heater Piping Diagrams).
LOW WATER
TEMPERATURE DELIVERY
A number of water heating applications may
require delivered water temperature in a
system below 140°F. Systems such as nursing
homes and hospitals would be examples of
this type of system.
A water heating system that will be operated
at less than 140°F must use a mixing valve
on the outlet side of the storage tank in order
to ensure that the products of combustion do
not condense inside the combustion chamber
of the water heater.
The mixing valve allows the water heater to
operate above 140°F to protect from
condensation, while still allowing a delivery of
colder water to the system fixtures. Also
inherent in this design is the protection of
occupants from water containing bacteria
such as Legionella. Legionella can be
significantly reduced in the water storage
vessel by heating the water to a minimum of
140°F. See Appendix A for piping details.
18 Lochinvar DESIGNER’S GUIDE COPPER-FIN II WATER HEATER 615-889-8900
Lochinvar
(TABLE K) – INLET GAS PRESSURE
MODELS NAT. GAS LPG
CF 401-751
Maximum Allowable 10.5”13”
Minimum Allowable 4.5”8”
CF 991-2071
Maximum Allowable 10.5”13”
Minimum Allowable 4.5”8”
4.
5.
EXAMPLE OF
HIGH ALTITUDE
APPLICATIONS
For example, if a unit’s
input is 100,000 Btu/hr
at sea level, the rated
input at 4000 feet of
elevation can be calculated
by derating input 4% per
1000 feet above sea
level.
[Btu/hr Input]
[1.00 - (Elevation/ 1000’
x 0.04)] = Btu/hr Input
at specified elevation.
[100,000][1.00 -
(4000’/1000’ x 0.04)] =
Btu/hr Input 4000’
elevation.
[100,000][0.84] =
84,000 Btu/hr Input at
4000’ elevation.
3.