Lochinvar COPPER-FIN CW 645 User manual

DESIGNER’S GUIDE COPPER-FIN®WAT ER HEAT ER
495,000 – 2,065,000 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 WATER HEATER 615-889-8900 1
Codes . . . . . . . . . . . . . . . . . . . . . . . . .2
Combustion & Ventilation Air . . . . . . . . .5
Contaminants . . . . . . . . . . . . . . . . . . . .6
Determining Total “Free Area” . . . . . . . .5
Electrical Requirements . . . . . . . . . . . .14
Gas Supply . . . . . . . . . . . . . . . . . . . .10
General Venting . . . . . . . . . . . . . . . . . .6
Location of Unit . . . . . . . . . . . . . . . . . .2
Low Water Temperature Delivery . . . . .12
Outdoor Use . . . . . . . . . . . . . . . . . . . .3
Outdoor Installation . . . . . . . . . . . . . . .9
Pump Operation . . . . . . . . . . . . . . . . .12
Relief Valve . . . . . . . . . . . . . . . . . . . .14
Venting Options . . . . . . . . . . . . . . . . . .8
Water Connections . . . . . . . . . . . . . . .11
Water Treatment . . . . . . . . . . . . . . . . .13
Water Velocity Control . . . . . . . . . . . .12
Figures & Tables Index
FIG. 1 Models CW 495-2066
Requirements For Installation
Over Combustible Floor . . . . .3
FIG. 2 Water Heater Equipment
& Control Orientation . . . . . . .4
FIG. 3-6 Combustion &
Ventilation Air . . . . . . . . . . .5,6
FIG. 7 Barometric Damper
Installation . . . . . . . . . . . . . . .8
FIG. 8 Multiple Unit Barometric
Damper Installation . . . . . . . .9
FIG. 9 Outdoor Venting . . . . . . . . . . .9
TABLE A. Clearances From
Combustible . . . . . . . . . . . . .3
TABLE B. Flue Sizes . . . . . . . . . . . . . . . .8
TABLE C. Outdoor Kits . . . . . . . . . . . .10
TABLE D. Gas Supply Pipe Sizing . . . .11
TABLE E. Inlet Gas Pressure . . . . . . . . .11
TABLE F. Required Temperature Rise . . .12
TABLE G. Required Pump Performance .13
TABLE H. Common Water
Manifold Sizes . . . . . . . . . . .14
TABLE I. Amp Draw . . . . . . . . . . . . . .14
Appendix A -
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 WATER HEATER 615-889-8900
1.
Lochinvar
oWater Velocity
(See page 12 for Required Degree
Rise chart.)
oFactory Supplied Pump
Capacity
(See page 12 for Pump Operation.)
oManifold Pipe Size
When using more than one heater
(See page 14 for Common Water
Manifold Size for Multiple Water
Heater Installation Table.)
oStorage Tank Circulating
Tappings
(See page 14 for Manifold Pipe
Size.)
oPlacement of Cold Water
Inlet and Building Return
(See Appendix A for Water Heater
Piping Diagrams.)
o Water Hardness
(See page 13 for Water Treatment
Information.)
In designing
a water heater system,
pay special attention to:
Under no circumstances is the
manufacturer to be held responsible
for water damage in connection
with this unit or any of its
components.

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.
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.
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, on page 9.
2.
4.
3.
Lochinvar DESIGNER’S GUIDE COPPER-FIN WATER HEATER 615-889-8900 3
(FIG. 1) 495-2066 REQUIREMENTS FOR
INSTALLATION OVER COMBUSTIBLE FLOOR
5.
(TABLE A) – CLEARANCES FROM
COMBUSTIBLE CONSTRUCTION
CLEARANCES CW495-2066
Right Side 3"
Rear 3"
Left Side 3"
(24"for Service)
Front ALCOVE*
(30"for Service)
Top 3"
Flue 1"**
* Alcove is a closet without a door.
** Consult local codes and/or vent
material manufacturer.