Slant-Fin SX-150, SX-210 User Manual

SENTRY

High efficiency, cast-iron gas boiler

®

LOWER PROFILE MAKES

PROBLEM INSTALLATIONS EASY

S

The boiler you choose for your home now will
affect your family’s comfort--and pocketbook--for
many years to come. Sentry boilers provide a
blend of efficiency and reliability that will keep your
home comfortably warm and your fuel costs low
year after year. A new Sentry boiler can save up to
30% or more on fuel bills compared to a typical old
boiler operating at 60% efficiency.

ENTR

High efficiency, cast-iron gas boiler

Y

A smarter choice for informed

®

• AGA input:
“S”models 34,000 to 150,000 Btu/hr
“SX”models 150,000 to 210,000 Btu/hr

• Low clearance

• Standing pilot or intermittent ignition.

• Saves energy. AFUE to 84.4%

Sentry is ideal for a wide variety of gas boiler
requirements, as a replacement or for new
installations. Its advanced design provides
years of trouble-free, high efficiency operation
while providing easy installation, even in sites
with low chimney connections or low over­head clearance.

Sentry is a reliable natural draft boiler. Many boil­ers resort to pulsing or condensing technologies,
copper fin-tubes and thermal bypass valves to
attain acceptable efficiency. Sentry achieves high
efficiency with fewer components, so there's less
chance of part failure or losing your heat. Sentry’s
efficiency to 84.4% is among the highest in the
industry. Sentry’s heat exchanger is made of quali­ty cast-iron and assembled with durable metal
push nipples. It's so reliable it comes with a lifetime
limited warranty. Sentry boilers respond quickly to
your thermostat’s call for heat, sending heat within
moments to radiators throughout your home.

Low profile makes problem installations easy.

The Sentry boiler fits into replacement sites with low
chimney breeching or low overhead clearance.

The Sentry “S” models include an integral draft diverter
and do not require a draft hood. They fit into replacement
sites with overhead clearance or chimney breeching as
low as 381⁄2 in. above the floor.* This is nearly a foot and a
half less clearance than required by typical natural draft
boilers. The rear flue outlet on “S” models keeps the vent
pipe out of the way of water and gas piping. Installation is
faster and trimmer.“SX” models utilize an external draft
hood.

“S” model with integral
draft diverter

“SX” model with external
draft hood

The computer-aided design of Sentry’s venting system
enables “S” and “SX” models to perform effectively under a
wide range of draft conditions. Sentry is one of the indus­try’s most versatile and durable high efficiency boilers.

*See installation instructions for specific applications and clearances.

LOW-PROFILE VERSATILITY.
NATURAL DRAFT RELIABILITY

All “S” and “SX” models permit installation in sites with low
chimney breeching or low overhead clearance.

Natural draft reliability and high
efficiency too. Choose intermittent
ignition or standing pilot.

Enjoy the easy installation and reliable operation
that natural draft design provides, plus high
efficiency too. With intermittent pilot ignition,
Sentry AFUE's range from 83.1% to 84.4%.

Standing pilot AFUE to 83% —
highest in the industry!

Sentry standing pilot models are the most efficient
in the industry, according to the I=B=R Boiler
Ratings directory. Now, with AFUE’s to 83%,
you can enjoy standing pilot reliability and high
efficiency too!
All models include an automatic vent damper.

Computer-aided design.
Highest quality manufacturing.
Superior components.

Advanced design heat exchanger with metal push
nipples provides superior performance, longer life.

Computer-aided design of heat exchanger maximizes transfer of
heat from the gas flame to the boiler water which then flows into
your heating system. Superior heat transfer properties permit use of
smaller, compact cast-iron heat exchanger sections. The flue pas­sage design, thermal pin pattern and consistent wall thickness
ensure uniform heat transfer with less thermal strain and metal
fatigue.

Metal push nipples avoid leaks.

Slant/Fin uses only metal push nipples that expand and contract
with the individual boiler sections that they connect. In many ordi­nary boilers, flimsy rubber or plastic gaskets are substituted for
metal push nipples and are subject to deterioration and leaks.

Reliable heavy-duty vent damper saves energy.

The motorized Slant/Fin vent damper increases efficiency of the
boiler by reducing standby losses. Motor closes the chimney vent
when the burner is off, fully opens it in anticipation of combustion.
May be installed horizontally or vertically to accommodate varying
vent pipe requirements. Heavy-duty collar maintains dimensional
stability for smooth operation.

Vent damper shown on “S” model.

Insulated base

Base is constructed of heavy gauge aluminized steel. Thick refracto­ry insulation surrounds combustion chamber, minimizing standby
losses and increasing efficiency.

Long-life burners

Quiet, light and easy to install or remove. Same stainless steel
burners serve natural or propane gas. Special port construction will
not permit flame to “lift” or flash back. Sentry burners last longer too
because of low operating temperature. Input per burner is only
15,000 Btu/hr.

S

ENTR

High efficiency, cast-iron gas boiler

Y

Motorized
heavy-duty
vent damper

®

Cast-iron
heat
exchanger

Thermal pins

Pressure
temperature
gauge

Relief valve

Integral
draft hood
(“S” models only)

Brand
name
controls

Insulated
jacket

Metal
push nipples

Insulated
base

Long life
burners

Highest standing
pilot AFUE
in the
industry.

Blocked vent
safety switch

Not visible in photo

Circulator pump

Rollout safety switch

Gas valve

There are 3 Sentry SX models

ranging in size from 150 to 210 MBh,

A.G.A. input. SX models include an external draft hood.

Make your house a more comfortable home

With a Sentry boiler at the heart of your heating system, you can enjoy deluxe heating comfort
all around your home. A Sentry boiler can be installed to provide heating energy for any or all
these hydronic heating systems:

Zone heating with Slant/Fin hot water baseboard and individual room temperature controls.

1

2

Warm floors with Terra Therma radiant heating by Slant/Fin.

3

Slant/Fin hot water fan-convection heaters under cabinets or stairs.

4

Hot water with a high volume Slant/Fin indirect-fired water heater.
Snow melting for driveway and sidewalks with Terra Therma radiant tubing.

5
6

Pool or spa water heating with a Slant/Fin boiler and external heat exchanger.

1

1

6

6

4

1

3

2

2

3

1

1

2

1

1

5

5

Zone your heating system for even greater fuel savings. By dividing your home into
separate heating zones, you can save energy by heating only those areas you’re
using. Depending on your existing piping arrangement, it may be quite
simple to zone your system.

1

1

2

1

More hot water for your kitchen,
bath and laundry

For a large reserve of hot water for your family all year
long, your installer can provide a Slant/Fin Model WH
indirect-fired water heater. It’s connected just like a
heating zone to the Sentry boiler and will store between
30 and 80 gallons of hot water. Tapping the boiler’s
heating capacity, the Slant/Fin water heater offers far
better efficiency, faster recovery and longer life than an
ordinary direct-fired water heater. The 40 gallon model,
for instance, delivers 195 gallons of hot water per hour!

RATINGS FOR SENTRY BOILERS--NATURAL AND L.P. GAS

C

193/4"

193/4"

193/4"

11/2" Supply

11/2"

Supply

11/2" Supply

3

/4" Drain

3

/4" Drain

3

/4" Drain

3

/4" to air eliminating

system (by others)

3

/4" to air eliminating

system (by others)

3

/4" to air eliminating

system (by others)

Rollout Safety

Switch

(behind

front panel)

Rollout Safety

Switch

(behind

front panel)

Rollout Safety

Switch

(behind

front panel)

Vent Damper*

Vent Damper*

Vent Damper*

Vent Damper*

287/16"

287/16"

32

7

/16"

61/2"

Pressure/Temp.

Gauge

Pressure/Temp.

Gauge

High Limit.

Control

Ignition
Control

High Limit

Control

Ignition
Control

High Limit

Control

Ignition
Control

Blocked Vent

Safety Switch

Blocked Vent

Safety Switch

Blocked Vent
Safety Switch

Supply Piping

(by others)

Supply Piping

(by others)

Combination

Gas Valve

(gas tapping 1/2")

Combination

Gas Valve

(gas tapping 1/2")

Combination

Gas Valve

(gas tapping 1/2")

Ground

Joint Union

Ground

Joint Union

Ground

Joint Union

Circulator:

1/4" Circ. Flange

11/2" Return Tapping

Circulator:

1/4" Circ. Flange

11/2" Return Tapping

Circulator:

1/4" Circ. Flange

11/2" Return Tapping

Sediment Trap

(required)



Sediment Trap

(required)



Sediment Trap

(required)



(Dotted piping

by others.)



(Dotted piping

by others.)



(Dotted piping

by others.)



Integral 

Draft

Diverter

Pressure/Temp.

Gauge

C

A

B

C

A

A

B

B

C

D

DIMENSIONS-Inches

C-VENT DIAMETER

INTEGRAL

B

DIVERTER

DRAFT

EXTERNAL

DRAFT

HOOD

MODEL

NUMBER †

A.G.A.
INPUT

(Btuh)

D.O.E.

CAPACITY

(Btuh)

NET

I=B=R

RATING

WATER
(Btuh) *

WATER

(Sq.Ft.)

EFFICIENCY

(A.F.U.E.%)

STANDING

PILOT

INTERMITTENT

IGNITION

A

S-34 34,000 29,000 25,000 167 80.4 84.0 81⁄8 145⁄8 4_ _
S-60 60,000 51,000 44,000 293 81.6 84.4 11
S-90 90,000 76,000 66,000 440 82.3 84.2 14
S-120 120,000 101,000 88,000 587 83.0 84.1 17
S-150 150,000 125,000 109,000 727 82.4 83.4 20
SX-150 150,000 126,000 110,000 733 82.1 83.2 20
SX-180 180,000 151,000 131,000 873 82.1 83.1 23

1

⁄8 175⁄8 4_ _

1

⁄8 205⁄8 5_ _

1

⁄8 235⁄8 6_ _

1

⁄8 265⁄8 7_ _

1

⁄8 265⁄8 _647

1

⁄8 295⁄8 _748

SX-210 210,000 175,000 152,000 1013 82.0 83.1 261⁄8 325⁄8 _748

* Net ratings are based on a piping and pick-up allowance of 1.15. Slant/Fin
should be consulted before selecting a boiler for installation having unusual
piping and pick-up requirements. Ratings must be reduced by 4% at 2,000
feet elevation and an additional 4% for every additional 1,000 feet elevation
over 2,000 feet.

Dimensions
MODEL S-34

LEFT END VIEW FRONT VIEW RIGHT END VIEW

†Type of gas: after model number, specify gas by name “Natural” or
“Propane”.
Note: All Sentry boilers are tested and rated for capacity under the U.S.

Dept. of Energy (D.O.E.) Test Procedure for boilers.

D

3

⁄16

3

⁄16

Dimensions
MODELS S-60
to S-150

LEFT END VIEW FRONT VIEW RIGHT END VIEW

Dimensions
MODELS SX-150
to SX-210

LEFT END VIEW FRONT VIEW RIGHT END VIEW

*Vent damper may be installed horizontally on all models with use of a common vent elbow.

S

ENTR

High efficiency, cast-iron gas boiler

Y

®

Engineered for comfort,
safety and reliability.

Lower profile,
higher efficiency

Millions of homes are
equipped with Slant/Fin
hydronic heating.

SLANT/FIN CORPORATION, Greenvale, NY 11548 • Phone: [phone]

Fax: [phone] • In Canada: Slant/Fin LTD/LTEE, Mississauga, Ontario

www.slantfin.com ©Slant/Fin Corp. 2002. Printed in the U.S.A. 502 Publication No. S-10