Lochinvar EW 150 User manual

DESIGNER’S GUIDE EFFICIENCY+®WATER HEATER
150,000 – 300,000 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 our 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
Lochinvar Corporation • 615-889-8900 / Fax: [phone]

Lochinvar DESIGNER’S GUIDE EFFICIENCY+ WATER HEATER 615-889-8900 1
Clearances . . . . . . . . . . . . . . . . . . . . . .3
Codes . . . . . . . . . . . . . . . . . . . . . . . . .2
Combustion & Ventilation Air . . . . . . . . .3
Contaminants . . . . . . . . . . . . . . . . . . . .5
Conventional Venting . . . . . . . . . . . . . .8
Direct Venting . . . . . . . . . . . . . . . . . . .11
Electrical Requirements . . . . . . . . . . . .17
Gas Supply . . . . . . . . . . . . . . . . . . . .15
General Venting . . . . . . . . . . . . . . . . .13
Location of Unit . . . . . . . . . . . . . . . . . .2
Low Water Temperature Delivery . . . . .16
Outdoor Installation . . . . . . . . . . . . . .14
Outdoor Use . . . . . . . . . . . . . . . . . . . .3
Pump Operation . . . . . . . . . . . . . . . . .16
Relief Valve . . . . . . . . . . . . . . . . . . . .17
Water Connections . . . . . . . . . . . . . . .16
Water Treatment . . . . . . . . . . . . . . . . .17
Water Velocity Control . . . . . . . . . . . .15
Figures & Tables Index
FIG. 1 Water Heater Equipment
and Control Orientation . . . . .3
FIG. 2-5 Combustion & Ventilation Air .4,5
FIG. 6 Barometric Damper
Installation . . . . . . . . . . . . . . .8
FIG. 7 Multiple Unit Barometric
Damper Installation . . . . . . . . .8
FIG. 8 E+ DirectAire Vent With
Sidewall Air Inlet . . . . . . . . .10
FIG. 9 E+ DirectAire Vent With
Rooftop Air Inlet . . . . . . . . . .10
FIG. 10 Horizontal Direct Vent . . . . . .12
FIG. 11 Horizontal Direct Vent Caps .12
FIG. 12 Multiple Sidewall
Direct Vent Caps . . . . . . . . .13
FIG. 13 Vertical Direct Vent . . . . . . . .13
FIG. 14 Outdoor Venting . . . . . . . . .14
TABLE A. Clearances From
Combustible Construction . . . .3
TABLE B. Conventional Venting,
Vent Connection Size . . . . . . .8
TABLE C. E+ DirectAire Vent Kits . . . . .10
TABLE D. Horizontal Direct Vent Kits . . .12
TABLE E. Vertical Direct Vent,
Flue And Air Inlet Sizes . . . . .13
TABLE F. Outdoor Vent Kits . . . . . . . . .14
TABLE G. Gas Supply Pipe Sizing . . . .15
TABLE H. Inlet Gas Pressure . . . . . . . . .15
TABLE I. Required Temperature Rise . .16
TABLE J. Required Pump Performance 17
TABLE K. Common Water
Manifold Size . . . . . . . . . . .17
TABLE L. Amp Draw Data . . . . . . . . . .17
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 w/Water Heaters
and Storage Tank . . . . . . . . . . . . . . . .A6
Table of Contents

2Lochinvar DESIGNER’S GUIDE EFFICIENCY+ WATER HEATER 615-889-8900
Lochinvar
CODES
The equipment MUST be installed in
accordance with those installation regulations
in effect in the local area where the installation
is to be made. These MUST be carefully
followed in all cases. Authorities having
jurisdiction MUST be consulted before
installations are made. In the absence of such
requirements, the installation MUST 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, No. (CSD-1). All boilers conform
to the latest edition of the ASME Boiler and
Pressure Vessel Code, Section IV. Where
required by the authority having jurisdiction,
the installation MUST comply with the
Canadian Gas 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 airflow. Under no circumstances
is the manufacturer to be held responsible
for water damage in connection with this
unit or any of its components.
•Water Velocity – Flow Rate
(See page 16 for Required
Temperature Degree Rise chart.)
•Factory Supplied
Pump Capacity
(See page 16 for Pump Operation.)
• Manifold Pipe Size
When using more than one heater
(See page 17 for Common Water
Manifold Size for Multiple Water
Heater Installation table.)
•Storage Tank Circulating
Tappings
(See page 17 for Manifold Pipe
Size.)
• Placement of Cold Water Inlet
and Building Return
(See Appendix A for Water Heater
Piping Diagrams.)
• Water Hardness
(See page 16 for Water Treatment
Information.)
In designing a hot
water heater system,
pay special attention to:
1.

The indoor unit 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.)
Units located in a residential garage
MUST be installed so that burners and
ignition devices have a minimum clearance
of 18" (46 cm) above the floor. The units
shall be located or protected to prevent
physical damage by a moving vehicle.
The appliance MUST be installed on a
level floor. A combustible wood floor may
be used without additional bases or special
floor buildup. Maintain required clearances
from combustible surfaces.
The appliance MUST NOT be installed on
carpet or other combustible material other
than wood flooring.
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 15.
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; or in Canada, the latest edition of
CGA Standard B149 Installation Code for
Gas Burning Appliances and Equipment; or
provisions of the local building codes.
3.
5.
4.
Lochinvar DESIGNER’S GUIDE EFFICIENCY+ WATER HEATER 615-889-8900 3
(TABLE A)
CLEARANCES FROM COMBUSTIBLE CONSTRUCTION
RIGHT SIDE 1”
REAR 1”
LEFT SIDE 6”(24”suggested for service)
FRONT 3”(24”suggested for service)
Suitable for closet installation
TOP 3”
*Allow sufficient space for servicing pipe connections, pump and other
auxiliary equipment, as well as the appliance.
(FIG. 1) WATER HEATER EQUIPMENT &
CONTROL ORIENTATION
FLUE PRODUCTS
VENT
HOT WATER
OUTLET
BURNER INSPECTION
PORT
GAS
CONNECTION
COLD WATER
INLET
BACK
TERMINAL STRIP
(INSIDE)
FRONT
DRAIN
120V ELECTRICAL
CONNECTION
AIR INLET
EW 150-300
LEFT SIDE
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 be sized to make
sure that it does not
cause drafts which
could lead to nuisance
operational problems
with the water heater.
2.

4Lochinvar DESIGNER’S GUIDE EFFICIENCY+ WATER HEATER 615-889-8900
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/hr input (5.5 cm2per 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/hr input (5.5 cm2per kW).
This opening MUST be located within 12”
(30 cm) 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/hr
(11 cm2per kW).
If air is taken from another interior space, each
of the two openings specified above should
have a net free area of one square inch per
1000 Btu/hr (22 cm2per kW) input, but
not less than 100 square inches (645 cm2).
Lochinvar
2.
(FIG. 4) COMBUSTION AIR FROM AN
INTERIOR SPACE
(FIG. 3) COMBUSTION AIR THROUGH
DUCTWORK
3.
(FIG. 2) COMBUSTION AIR DIRECT FROM
OUTSIDE
1.
EXAMPLE OF
SIZING FOR
COMBUSTION
& VENTILATION
AIR OPENINGS
(WATER HEATER
WITH 300,000
BTU/HR INPUT):
When combustion and
ventilated air is taken
from directly outside the
building (FIG. 2), divide
the total BTU’s by 4,000.
This yields 75 sq.in. of
“Free Area” without
restriction.
(300,000/4,000 =
75 sq.in.)
Since the air opening is
50% closed due to
screens and louvers, the
total opening MUST be
multiplied by 2.
(75 sq.in. x 2 =
150 sq.in.)
This project requires one
Ventilation Air Opening
of 150 square inches
with louver dimensions
of 12” x 15”= 180
sq.in. and one
Combustion Air Opening
of 150 square inches
with louver dimensions
of 12” x 15”.

Lochinvar DESIGNER’S GUIDE EFFICIENCY+ WATER HEATER 615-889-8900 5
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/hr (7 cm2per kW). This opening
MUST be located within 12”(30 cm) 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 and 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
Vent installations for connection to gas vents or
chimneys should 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, using the proper vent table.
The horizontal breaching of a vent MUST
have at least 1/4”rise per linear foot.
The horizontal portions shall 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 Type “B” double
wall vent (or equivalent) for conventional vent
applications.
When utilizing direct vent capabilities,
connections MUST be made with AL29-4C
stainless steel (or equivalent) vent material.
Material should be sized according to vent sizing tables
(FAN column) in the latest edition of the National Fuel
Gas Code.
4.
CAUTION! Under no circumstances should the
equipment room be under a negative pressure
when atmospheric combustion equipment is
installed in the room.
(FIG. 5) COMBUSTION AIR FROM A
SINGLE OPENING
NOTE:
The weight of the
venting system MUST
NOT rest on the water
heater. It should be
properly supported.
WARNING
Vent connectors serving
gas appliances, which
operate under a
negative vent pressure,
shall not be connected
into any portion of
mechanical draft
systems operating under
positive vent pressure.

6Lochinvar DESIGNER’S GUIDE EFFICIENCY+ WATER HEATER 615-889-8900
The vent materials and accessories, such as
firestop spacers, thimbles, caps, etc., MUST
be installed in accordance with the
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 the existing building should
be corrected when new equipment is installed,
so that the installation conforms to the latest
edition of the National Fuel Gas Code, ANSI
Z223.1.
The efficiency of this appliance allows its
products of combustion to be vented through a
smaller vent pipe when compared to units of
the same Btu/hr capacity. For this reason,
resizing common venting systems is
recommended for proper operation.
When resizing any portion of the common
venting system, it should be resized to
approach the minimum size as determined
using the appropriate tables (FAN column) in
the National Fuel Gas Code.
Failure to resize a common venting system
could lead to the formation of condensate and
premature deterioration of the vent material.
Flue gas condensate can freeze on exterior
walls or on the vent cap. Frozen condensate
on the vent cap can result in a blocked flue
condition. Some discoloration to exterior
building surfaces can be expected. Adjacent
brick or masonry surfaces should be protected
with a rust resistant sheet
metal plate.
Vent connectors serving appliances vented by
natural draft shall not be connected to
any portion of a mechanical draft system
operating under positive pressure.
Connection to a positive pressure stack may
cause flue products to be discharged into the
living space causing serious health injury.
Locate units as close as possible to a chimney
or gas vent.
VENT TERMINATIONS
When locating the vent cap, consider the
effects of snow, leaf dropping, etc., to insure
that no blockage occurs.
The distance of the vent terminal from adjacent
public walkways, adjacent buildings, windows
that open and building openings MUST
comply with the latest edition of the National
Fuel Gas Code, ANSI Z223.1.
The vent terminal should be vertical and
exhaust outside the building at least 2 feet
(0.6 m) above the highest point of the roof
within a 10 foot (3.05 m) radius of the
termination.
Lochinvar
IMPORTANT!
The vent cap should
have a minimum
clearance of 4 feet
horizontally from electric
meters, gas meters,
regulators, air inlets and
air relief equipment.
Additionally, the vent
cap should never be
located above or below
these items, unless a 4
foot horizontal distance
is maintained.

The vertical termination MUST be a minimum
of 3 feet (0.9 m) above the point of exit in the
rooftop.
A vertical termination less than 10 feet
(3.05 m) from a parapet wall MUST be a
minimum of 2 feet (0.6 m) higher than the
parapet wall.
The vent cap shall terminate at least 3 feet
(0.9 m) above any forced air inlet within 10
feet (3.05 m). The vent shall terminate at least
4 feet (1.2 m) below, 4 feet (1.2 m)
horizontally from or 1 foot (0.30 m) above
any door, window, or gravity air inlet to the
building.
Do not terminate the vent in a window well, stairwell,
alcove, courtyard, or other recessed area. The vent
cannot terminate below grade.
MASONRY CHIMNEY
A masonry chimney MUST be properly sized
for the installation of a high efficiency gas fired
appliance. Venting of a high efficiency
appliance into a cold or oversized masonry
chimney can result in operational and safety
problems.
Exterior masonry chimneys, with one or more
sides exposed to cold outdoor
temperatures, are more likely to have
venting problems. For this reason, exterior
masonry chimneys are not generally
recommended to vent high efficiency gas
appliances.
An interior masonry chimney, which is not
exposed to the outdoors below the roofline,
may be used to vent high efficiency gas
appliances based on the results of careful
inspection, proper sizing and local code
approval. If there is any doubt about the sizing
or condition of a masonry chimney, it MUST
be relined with a properly sized and approved
chimney liner system.
An interior masonry chimney MUST be
carefully inspected to determine its suitability
for the venting of flue products.
A clay tile lined chimney MUST be structurally
sound, straight and free of misaligned tile,
gaps between liner sections, missing sections
of liner or any signs of condensate drainage at
the breeching or clean out. If there is any
doubt about the condition of a masonry
chimney, it MUST be relined.
Metallic liner systems (Type “B” double-wall,
flexible, or rigid metallic liners) are
recommended to line or reline an existing
masonry chimney. Consult with local code
officials to determine code requirements or
the advisability of using a lined masonry
chimney or relining of a masonry chimney.
Lochinvar DESIGNER’S GUIDE EFFICIENCY+ WATER HEATER 615-889-8900 7
NOTE:
An unlined masonry
chimney MUST NOT be
used to vent flue
products from this high
efficiency appliance.

8Lochinvar DESIGNER’S GUIDE EFFICIENCY+ WATER HEATER 615-889-8900
CONVENTIONAL VENTING –
NEGATIVE DRAFT
Size vent material according to the “FAN”
column of vent sizing tables in the latest edition
of the National Fuel Gas Code.
“FAN” applies to Category I fan-assisted
combustion appliances with natural draft.
Utilize Category I Type “B” vent material
for all conventional venting applications.
A bell increaser is provided and installed
directly on the water heater vent outlet.
The bell increases the water heater vent
size by 1 inch (25.4 mm) in diameter. The vent
connection is made directly to the bell
increaser on the top of the unit. No additional
draft diverter or barometric damper is
required.
When each unit is installed with an individual
vent, and the negative draft is higher than the
specified range of 0.02 to 0.05 inches of
water column, a barometric damper will be
necessary.
Multiple unit installations with combined
venting require barometric dampers to regulate
draft at each unit. The negative draft MUST
be within the range of 0.02 to 0.05 inches of
water column to ensure proper operation.
All draft readings are made while unit is in
stable operation (approximately 2 to 5
minutes).
Lochinvar
(FIG. 7) MULTIPLE UNIT BAROMETRIC
DAMPER INSTALLATION
WATER HEATER/BOILER
BAROMETRIC DAMPER ON SINGLE UNIT INSTALLATION
Lined
Chimney
WATER HEATER/BOILER
BAROMETRIC DAMPER ON SINGLE UNIT INSTALLATION
(FIG. 6) BAROMETRIC DAMPER INSTALLATION
(TABLE B)
CONVENTIONAL VENTING, VENT CONNECTION SIZE
MODEL DIAMETER
EW 150 5”
EW 200 5”
EW 250 6”
EW 300 6”
NOTE:
An unlined masonry
chimney MUST NOT be
used to vent flue
products from this high
efficiency appliance.