Lochinvar COPPER-FIN II CF501, COPPER-FIN II CF1261, COPPER-FIN II CF1441, COPPER-FIN II CF1801, COPPER-FIN II CF2071 Designer's 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.

2 Lochinvar DESIGNER’S GUIDE COPPER- FIN II WATER HEATER 615-889-8900

1.

Lochinvar

o

Water Velocity

(See page 19 for Required

Temperature Rise chart.)

o

Factory Supplied Pump

Capacity

(See page 19 for Pump Operation.)

o

Manifold Pipe Size

When using more than one heater

(See page 20 for Common Water

Manifold Size for Multiple Water

Heater Installation Table.)

o

Storage Tank Circulating

Tappings

(See page 20 for Manifold Pipe

Size.)

o

Placement 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.

4 Lochinvar 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

6 Lochinvar 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 (5.5cm

2

per 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 (5.5cm

2

per 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 (11cm

2

per 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 (22cm

2

per kW) of input, but not less

than 100 square inches (645 cm

2

).

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 (7cm

2

per 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.

8 Lochinvar 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 in

2

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-Lock

TM

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 AL29­4C 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.

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-Lock

TM

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 Protection­Outdoor 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

2

1

/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.

Lochinvar DESIGNER’S GUIDE COPPER- FIN II WATER HEATER 615-889-8900 19

WATER VELOCITY CONTROL

IMPORTANT

To ensure proper velocity through the
heat exchanger, it is necessary to regulate the
temperature rise across the heat exchanger
from inlet to outlet. (This must be done on
initial installation and periodically rechecked).

With the correct temperature rise across the
heat exchanger (See TABLE L), you may be
assured of the proper velocity in the tubes
and long life and economical operation from
the water heater.

PUMP OPERATION

The water heater MUST be connected
with a properly sized and installed,
intermittent operating, all bronze pump
that circulates water between heater
and storage tank.

The pump is sized to heater input and
water hardness. Should water hardness
exceed 25 grains/350 TDS, consult
factory for pump sizing.

The pump chart (Table M) is based on the
following fittings:

6-90° elbows 2 ball valves
2 unions 1 cold water supply tee

Due to pump capacity the following
specifications cannot be exceeded
when using the standard pump:

• Not more than 45 feet of straight pipe.

• For every elbow and tee in excess of
those shown above, DEDUCT 5 FEET
from maximum allowable straight pipe
in heater-to-tank circulating loop.

WATER TREATMENT

In hard water areas, water treatment
should be used to reduce introduction
of minerals into the system. Minerals
in the water can collect in the heat
exchanger tubes causing noise and
inefficient operation. Excessive build-up
of materials in the heat exchanger can
cause a non-warrantable failure.

NOTE:

Care should be taken to

measure temperature

rise and maintain proper

water velocity in the

heat exchanger.

(TABLE L) - REQUIRED TEMPERATURE RISE

MODEL NUMBER TEMPERATURE RISE °F

CF401 12

CF501 15

CF651 20

CF751 23

CF991 19

CF1261 24

CF1441 27

CF1801 34

CF2071 39

(TABLE M) – REQUIRED PUMP

PERFORMANCE FOR WATER HARDNESS

OF 5 TO 25 GRAINS

MODEL GPM FT. HD AMP DRAW HORSE VOLTAGE/

POWER PHASE

CF401-751 55 10 5.8 1/4 120/1

CF991-2071 90 15 7.4 1/2 120/1

NOTE:

A larger pump must be

utilized in situations

where the distance

between the water

heater and tank exceed

those specified.

1.

2.

NOTE:

If a pressure reducing

valve or check valve is

in the system a properly

sized expansion tank

may be required.

20 Lochinvar DESIGNER’S GUIDE COPPER- FIN II WATER HEATER 615-889-8900

Lochinvar

Acceptable Water Quality Levels
Maximum Water Hardness = 25 Grains
Minimum Water Hardness = 5 Grains
Maximum Total Dissolved Solids = 350 PPM
Range of Acceptable pH = 7.2 to 7.8

Standard production Lochinvar water heaters
are designed to operate free of impurity
build-up in the heat exchanger when
properly installed and operated under the
specified water quality conditions.

For installation in areas outside these
parameters, please consult the factory.

Water Flow Switch

Due to the low water content (between 1
and 6 gallons) of the copper finned tube
heat exchanger, a flow switch is factory
installed as a low water cutoff device on
models CF401 thru CF2071. The flow
switch is installed in the outlet piping from
the water heater and wired in series with the
ignition system safety controls.

In most localities, a flow switch is acceptable
as a low water cutoff device on water
heaters requiring forced circulation. It is
prudent to verify acceptance with the local
code official.

Relief Valve

This water heater is supplied with
temperature and pressure relief valve(s)
sized in accordance with ASME Boiler and

Pressure Vessel Code, Section IV “Heating
Boilers.”

ELECTRICAL REQUIREMENTS

(North America)

The appliance is wired for 120 volts.

All wiring between the unit and field
installed devices shall be made of type
T wire [63°F (35°C) rise].

The pump must be wired to run
continuously when unit is firing.

It is recommended that the water heater
and pump be wired on separate circuits
with properly sized breakers.

NOTE:

When the unit is

installed in Canada, it

must conform to the

CAE C22.1,

Canadian Electrical

Code, Part 1,

and/or local Electrical

Codes.

NOTE:

Incorrect piping

of the cold water

supply to the

system will result

in condensate formation

on the

heat exchanger

and operational

problems. Higher water

temperatures reduce

condensate formation.

Refer to drawings in

Appendix A.

2.

1.

3.

(TABLE N) – COMMON WATER MANIFOLD

SIZE FOR MULTIPLE WATER HEATER

INSTALLATION

Pipe sizing chart provides minimum pipe size for

common manifold piping to ensure adequate flow.

NUMBER OF COMMON MANIFOLD SIZE

UNITS (Min.)

CF 401 thru 751

12”
23”
33

1

/2”

44”
55”
65”

CF 991 thru 2071

12

1

/2”

24”
34”
45”
56”
66”

(TABLE O) – AMP DRAW DATA

MODEL FAN(S) CONTROLS PUMP TOTAL AMPS
NUMBER w/PUMP

CF401 3.6 2.7 5.0 11.3

CF501 3.6 2.7 5.0 11.3

CF651 5.4 3.4 5.0 13.8

CF751 5.4 3.4 5.0 13.8

CF991 3.2 7.2 5.8 16.3

CF1261 3.2 7.2 5.8 16.3

CF1441 6.7 7.2 5.8 19.8

CF1801 6.7 7.2 5.8 19.8

CF2071 6.7 7.2 5.8 19.8

2005 Elm Hill Pike • Nashville, TN 37210 • 615-889-8900 • Fax: [phone]

COPPER-FIN II®WATER HEATER

PIPING DIAGRAMS

APPENDIX A

WATER HEATER PIPING DIAGRAMS

PIPING DIAGRAM SINGLE HEATER - SINGLE TANK

BUILDING HOT

WATER SUPPLY

LOCK-TEMP

STORAGE

TANK

DRAIN

FULL PORT

BALL VALVE

SYSTEM

PUMP

SYSTEM

RELIEF VALVE

TEE ELBOW UNION EXPANSION

TANK

CHECK
VALVE

THERMOMETER

COLD WATER SUPPLY

BUILDING RETURN

INLET

OUTLET

LOCHINVAR

WATER HEATER

LEGEND

LIT0133

A1 Lochinvar DESIGNER’S GUIDE COPPER- FIN II WATER HEATER 615-889-8900

This illustration is for concept only and should not be used for any actual installation without engineering
or technical advice from a licensed engineer. All necessary equipment may not be illustrated.

RELIEF VALVE

PIPING DIAGRAM SINGLE HEATER - TWO TANKS

FULL PORT

BALL VALVE

SYSTEM

PUMP

SYSTEM

RELIEF VALVE

TEE ELBOW UNION EXPANSION

TANK

CHECK
VALVE

THERMOMETER

LEGEND

BUILDING HOT

WATER SUPPLY

LOCHINVAR WATER

HEATER

COLD WATER

SUPPLY

BUILDING

RETURN

LOCK-TEMP

STORAGE TANKS

RELIEF VALVE

DRAIN

OUTLET

INLET

LIT0135

Lochinvar DESIGNER’S GUIDE COPPER- FIN II WATER HEATER 615-889-8900 A2

This illustration is for concept only and should not be used for any actual installation without engineering
or technical advice from a licensed engineer. All necessary equipment may not be illustrated.

FULL PORT

BALL VALVE

SYSTEM

PUMP

SYSTEM

RELIEF VALVE

TEE ELBOW UNION EXPANSION

TANK

CHECK
VALVE

THERMOMETER

LEGEND

PIPING DIAGRAM TWO TEMPERATURE INSTALLATION - SINGLE HEATER-SINGLE TANK

HIGH TEMPERATURE

BUILDING RETURN

LOW TEMPERATURE

BUILDING RETURN

DRAIN

INLET

OUTLET

COLD WATER

SUPPLY

140

0

F HOT

WATER SUPPLY

180

0

F HOT

WATER SUPPLY

LOCK-TEMP

STORAGE TANK

LOCHINVAR

WATER HEATER

MIXING

VALVE

CHECK VALVE

RELIEF
VALVE

LIT0136

A3 Lochinvar DESIGNER’S GUIDE COPPER- FIN II WATER HEATER 615-889-8900

This illustration is for concept only and should not be used for any actual installation without engineering
or technical advice from a licensed engineer. All necessary equipment may not be illustrated.

PIPING DIAGRAM TWO HEATERS-SINGLE TANK

FULL PORT

BALL VALVE

SYSTEM

PUMP

SYSTEM

RELIEF VALVE

TEE

ELBOW UNION EXPANSION

TANK

CHECK
VALVE

THERMOMETER

REDUCING

TEE

REDUCING

TEE

LEGEND

LOCHINVAR

WATER HEATER

INLET

INLET

OUTLET

OUTLET

BUILDING RETURN

DRAIN

LOCK-TEMP

STORAGE TANK

COLD WATER

SUPPLY

BUILDING

HOT WATER

SUPPLY

LIT0138

RELIEF
VALVE

COMMON WATER MANIFOLD SIZE FOR MULTIPLE WATER HEATER INSTALLATION

Pipe sizing chart provides minimum pipe size for common manifold piping to insure adequate flow.

NUMBER OF COMMON MANIFOLD SIZE NUMBER OF COMMON MANIFOLD SIZE

UNITS (Min.) UNITS (Min.)

CF 401 thru 751 CF 991 thru 2071

12” 12

1

/2”

23” 24”

33

1

/2” 34”

44” 45”
55” 56”
65” 66”

Lochinvar DESIGNER’S GUIDE COPPER- FIN II WATER HEATER 615-889-8900 A4

This illustration is for concept only and should not be used for any actual installation without engineering
or technical advice from a licensed engineer. All necessary equipment may not be illustrated.

Gray shaded area represents common manifold piping.

FULL PORT

BALL VALVE

SYSTEM

PUMP

SYSTEM

RELIEF VALVE

TEE ELBOW UNION EXPANSION

TANK

CHECK
VALVE

REDUCING

TEE

REDUCING

TEE

LEGEND

PIPING DIAGRAM TWO HEATERS-TWO TANKS

BUILDING

RETURN

LOCHINVAR

WATER HEATER

COLD WATER

SUPPLY

LOCK-TEMP

STORAGE

TANKS

DRAIN

Gray shaded area represents common manifold piping.

INLET

INLET

OUTLET

OUTLET

BUILDING

HOT WATER

SUPPLY

RELIEF
VALVE

LIT0451

THERMOMETER

COMMON WATER MANIFOLD SIZE FOR MULTIPLE WATER HEATER INSTALLATION

Pipe sizing chart provides minimum pipe size for common manifold piping to insure adequate flow.

NUMBER OF COMMON MANIFOLD SIZE NUMBER OF COMMON MANIFOLD SIZE

UNITS (Min.) UNITS (Min.)

CF 401 thru 751 CF 991 thru 2071

12” 12

1

/2”

23” 24”

33

1

/2” 34”

44” 45”
55” 56”
65” 66”

A5 Lochinvar DESIGNER’ S GUIDE COPPER- FIN II WATER HEATER 615-889-8900

This illustration is for concept only and should not be used for any actual installation without engineering
or technical advice from a licensed engineer. All necessary equipment may not be illustrated.

PIPING DIAGRAM MULTI-STACK FRAME W/WATER HEATERS AND STORAGE TANK

LIT0396

Lochinvar DESIGNER’S GUIDE COPPER- FIN II WATER HEATER 615-889-8900 A6

20 Lochinvar DESIGNER’S GUIDE COPPER- FIN II WATER HEATER 615-889-8900

Notes

Lochinvar Corporation • Lebanon, TN • 615-889-8900 / Fax: [phone]

www.Lochinvar.com

CF-DG-05 (Reprint CF-DG-05 1/07) 11/07-Printed in U.S.A.