Lochinvar SDT065 User Manual

Stainless Steel Indirect Water Heaters

12 Squire Models to Choose From

- 6 Standard Models from 30 to 119 Gallons

- 6 Solar Models from 65 to 119 Gallons

316L Passivated Stainless Steel Tank

304L High Capacity Stainless Steel Coil

Fully Welded Construction

Lochinvar.com

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- a new Class of Water Heater

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Introducing Lochinvar’s newest member of the family, the Squire Stainless
Steel Indirect Water Heater. With 12 models to choose from in capacities from
30-119 gallons, we are sure to have the right size indirect water heater to fit
your application.

Squire now features important enhancements that our customers will recognize
and benefit from such as a welded and passivated stainless steel tank and heat
exchanger, two-inch thick, high-density insulating foam with a tested R Value
of 13.4, and best of all an American made product built in Lebanon, Tennessee.

Stainless Steel Tank Manufacturing

Laser Cut Precision

A CNC laser uses Programmable Logic Controls to precisely cut the Squire Indirect Water
Heater’s tank shell out of 14 gauge 316L stainless steel to a tolerance of .01 inch.

Tank Cylinder Roller

The computer controlled tank cylinder rolling machine ensures that the 316L stainless
steel is transformed into a geometrically perfect cylinder.

Coil Winder

Straight tubes are rolled by a seven axis coil winder and turned into a precise, round

LASER Cut Precision

Robotic Welder

This state of the art six axis programmable robotic welder uses computer guidance to
accurately weld all of the stainless steel fi ttings and coil to the stainless steel tank.

Hydrostatic Leak Test

After it leaves the robotic welder the tank is hydrostatically pressure tested to ensure
quality conformance.

coil used in the indirect water heater to transfer the BTU’s from the heat source to the
potable water stored in the tank.

Passivation Process

Each tank is subjected to a soaking spray of
nitric acid. This treatment washes away any
iron that was left behind during the welding
process and re-establishes the oxide level of the
stainless steel to ensure corrosion resistance.
By removing iron from the welded surfaces, the
Squire is less susceptible to corrosion brought
on by aggressive water.

Robotic Welder

Jacket and Foam

The dent resistant polypropylene jacket and ABS
caps are attached to the tank assembly, and then
high density foam is added using a high pressure
dispensing system to provide insulation that will
keep the heat where it belongs, in the water. The
result is an evenly foam insulated and jacketed
tank with an R-value of 13.4 and stand-by losses

Passivated for Protection

as low as .5°F per hour, depending on model.

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R-13.4 Foam Insulated

Outstanding Features

Six Standard Models from 30 to 119 Gallons

The highest quality indirect water heater in the market also has
one of the widest ranges of gallon capacities. With 6 models
covering gallon capacities from 30 to 119 gallons the Squire is
one of the broadest lines available.

Six Solar Models from 65 to 119 Gallons

With three dual coil models for solar heating in conjunction
with a boiler and three models with a solar coil and an electric
element the Squire line of water heaters has a model to fit any
residential or light duty commercial solar application.

100% Stainless Steel Construction

Squire Water Heaters are constructed with Stainless Steel
materials that are highly resistant to corrosion that results from
poor water quality.

Inside Look

Dent resistant polypropelene jacket*

Boiler
water inlet

Boiler water
outlet

Temperature
& pressure
relief valve

Sensor
well

304L
Stainless
Steel coil

High density
foam
insulation

316L Passivated Stainless Steel Tank

316L Stainless Steel material is used for the tank interior for
superior durability and long life. The rust prohibitive characteristics
of this material make it the perfect material to resist the corrosive
tendencies of domestic water. The passivation process consists
of a treatment method that enhances and increases the superior
corrosion resistance of stainless steel.

304L High Capacity Stainless Steel Coil

The Squire’s 304L Stainless Steel heating coil efficiently transfers high
volumes of BTU’s from the heat source to the domestic water stored in

the tank. The high first hour delivery rivals the best in the industry.

Built in the U.S.A. at Lochinvar’s World Headquarters

A 100% stainless steel indirect water heater built in the USA,
the Squire is completely assembled in Lebanon, Tennessee .

How it Works

Stainless Steel SIT Indirect

The Squire uses the power and efficiency of the

building’s heating boiler or solar array to also generate

domestic hot water for showers, dishwashing, clothes

washing or any potable hot water demand. The

efficiency of the heating boiler could be as much as 20%

higher than a direct-fired tank-type water heater. So, why

not use that efficiency to “indirectly” provide hot water for

all potable applications?

By using the Squire to indirectly heat the domestic water, you
eliminate the additional gas line, electrical connections and
vent ducts needed with direct-fired tank-type water heaters.

Cold water
inlet

*SET models feature metal jacket

Combine our Knight Heating Boiler with our
Squire Indirects for the perfect combination for
your application.

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Fully Welded Construction

Lochinvar utilizes state of the art, highly accurate robotic
welding equipment that results in a fully welded construction
method that requires no gaskets or mechanical sealing
methods. Gaskets and seals are the weak point of any water
storing appliance, therefore Lochinvar’s advanced design

eliminates this potential failure point.

Factory Supplied Tank Sensor (SIT and SDT only)

A tank sensor with built in temperature limit is standard
equipment on all sizes. This sensor accurately monitors the
water temperature and sends a call for heat when the tank
temperature drops below the desired setpoint. This sensor
is 100% compatible and can be directly connected with

Lochinvar’s line of KNIGHT Heating Boilers.

Squire Indirect Water Heaters with a dual coil design
have a coil in the lower portion of the tank to transfer
heat from a solar array to the water that is stored in
the tank.

An additional coil in the upper portion of the tank
will transfer heat from a back-up boiler into the
water. This will ensure that the tank has ample hot
water even at times when the solar array cannot
generate enough heat to suitably heat the tank.

T&P Relief Valve

Supplied with the unit in the carton. (shipped loose)

High Density CFC/HCFC Free Polyurethane Foam

Two inches of R-13.4 High Density Polyurethane foam yields
the lowest standby losses in the industry.

Attractive Rust Resistant Jacket

Resistant to scratches and dents, the Squire will maintain its
classic high quality appearance for years.

Limited Lifetime Warranty*

Lochinvar believes that the Squire is the best built Indirect
Water Heater on the market, we have a Limited Lifetime
warranty to prove it.

*SIT models only

Solar Indirect with SET Electric Back-upSolar Indirect with SDT Dual Coil

Squire Indirect Water Heaters with a single coil and
an electric element are designed to collect heat from
a solar array and transfer the collected heat into
the stored water by way of the indirect coil which is
located in the lower portion of the tank.

An electric element, which is controlled by a factory
supplied thermostat, is positioned in the top half of
the tank to ensure ample hot water even at times
when the solar array is not capable of collecting the
heat required by the DHW demand.

Stainless Steel Indirect SIT Models Dimensions and Specifications

Domestic Coil
Model Water Connection Shipping
Number A B D G H I Conn. Size

SIT030 39-1/2” 20” 32-1/4” 21-3/4” 8-1/4” 3” 1” 1” 79
SIT040 55-1/2” 20” 48-1/2” 25-1/4” 8-1/4” 3” 1” 1” 105
SIT050 47” 24” 39-3/4” 24-1/2” 9-1/4” 3-3/4” 1” 1” 131
SIT065 60” 24” 52-1/4” 28” 9-1/4” 3-1/4” 1-1/2” 1” 147
SIT080 69-1/2” 24” 61-3/4” 28” 9-1/4” 3-1/4” 1-1/2” 1” 177
SIT119 68-1/4” 28” 60-1/4” 31-3/4” 9-1/4” 3-1/4” 1-1/2” 1” 213

Wt. (lbs.)

Heat Source Standby First Continuous 1st Hour Min. Flow Friction
Model Capacity Water Volume Loss Draw Delivery Delivery Coil Load Rate Loss
Number (Gallons) (Gallons) (°F/Hr) Gals. (GPH) (Gallons) (Btu/Hr) (GPM) (Ft. Hd.)

SIT030 27.0 1.1 1.5 24 160 183 99,000 14.0 3.9
SIT040 40.0 1.6 0.9 27 181 208 115,000 14.0 4.5
SIT050 51.6 1.7 0.9 47 209 255 133,000 14.0 5.3
SIT065 67.0 1.9 0.7 65 263 327 154,000 14.0 5.7
SIT080 81.5 2.1 0.6 74 266 347 160,000 14.0 5.7
SIT119 113.4 3.2 0.5 109 349 459 216,000 14.0 6.5

Performance data is based on I=B=R test results. All ratings are based on 180°F boiler water temperature with incoming cold water at 50°F and a Delta T of 77°F.
Includes tank sensor for use with KNIGHT Heating Boiler.

Optional thermostat available for use with other boiler models.

All models standard with a Lifetime
Limited Warranty Against Tank Failure.
All parts are warranted for one year.
Five year limited tank warranty on all
models when installed in a commercial
application..

* SIT models only

*SIT models

Solar Stainless Steel Indirect Dimensions and Specifications

A

D

G

H

I

FROM
PAN EL

TO
PAN EL

COLD WATER
INLET

SOLAR
SENSOR
WELL

SDT Models SET Models

SDT Models Dimensions and Specifications

Domestic Coil
Model Water Connection Shipping
Number A B D E F G H I Conn. Size

SDT065 60” 24” 52-1/4” 47-1/4” 33-3/4” 28” 9-1/4” 3-1/4” 1-1/2” 1” 158
SDT[phone]” 24” 61-3/4” 53-3/4” 40-1/4” 28” 9-1/4” 3-1/4” 1-1/2” 1” 188
SDT119 68” 28” 60-1/4” 54-1/2” 37-1/2” 31-3/4” 9-1/4” 3-1/4” 1-1/2” 1” 224

Wt. (lbs.)

Heat Boiler Heat Standby Continuous 1st Hour Min. Flow Friction
Model Capacity Source Water Source Water Loss Delivery Delivery Coil Load Rate Loss
Number (Gallons) Volume (Gals.) Volume (Gals.) (°F/Hr) (GPH) (Gallons) (Btu/Hr) (GPM) (Ft. Hd.)

SDT[phone].6 204.7 128,000 14.0 3.4
SDT[phone].6 207.1 128,000 14.0 3.4
SDT[phone] 250.2 300.5 181,000 14.0 4.9

Performance data based on incoming cold water at 50°F and a Delta T of 77°F. Delivery ratings for boler coil only. Includes tank sensor for use w/ KNIGHT Heating Boiler.

SET Models Dimensions and Specifications

Domestic Coil
Model Water Connection Shipping
Number A B D F H I Conn. Size

SET065 60” 24” 52-1/4” 28” 9-1/4” 3-1/4” 1-1/2” 1” 149
SET080 69-1/2” 24” 61-3/4” 28” 9-1/4” 3-1/4” 1-1/2” 1” 179
SET119 68-1/4” 28” 60-1/4” 31-3/4” 9-1/4” 3-1/4” 1-1/2” 1” 215

Electric Electric
Heat Source Standby Continuous 1st Hour
Model Capacity Water Volume Loss Delivery Delivery
Number (Gallons) (Gallons) (°F/Hr) (GPH) (Gallons)

SET065 67.0 1.9 0.5 23.9 54.0
SET080 80.9 2.1 0.5 23.9 56.4
SET119 112.4 3.2 0.5 23.9 74.2

All SET models: 4500w 240v 1 phase.

SIT-02 (Replaces SIT-01 3/10)

Lochinvar Corporation • 300 Maddox Simpson Pkwy • Lebanon, TN 37090 • 615-889-8900 / Fax: [phone]

*SET models only

www.Lochinvar.com

Wt. (lbs.)

All models standard with a 5 year
Limited Warranty Against Tank Failure.
All parts are warranted for one year.*

* SET & SDT models only

FG-20M-6/11–Printed in U.S.A.