Slant Fin Galaxytm Gg Series Users Manual

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GALAXY
High performance gas boilers

HOT WATER AND STEAM
NATURAL AND
L.P. PROPANE GASES

™

GALAX
Y
Cast-iron boilers

™

Slant/Fin’s Galaxy is one of America’s most trusted
gas boilers. Installed in tens of thousands of homes,
Galaxy is the choice of experienced heating professionals everywhere. For homeowners, it’s the wise choice
for long-term efficiency and reliability.

Fuel saving performance with traditional
cast-iron boiler design
We’ve fine tuned natural draft cast-iron boiler technology to its most advanced state. With AFUE ratings to
84.78%, Galaxy keeps fuel costs low. It doesn’t rely on
complex technologies or exotic materials for its efficiency, so there’s less to pay for now and less to go wrong.
While other boilers become subject to performance and
breakdown problems over the years, you can count on
Galaxy for efficient, trouble-free performance.

Versatility to meet your home’s unique
heating needs
• Sizes from 75,000 to 399,000 Btuh
• Hot water and steam models
• Standing pilot or intermittent pilot
• Natural gas or propane
• Tankless heater optional
• Low profile steam models available

GG SERIES
Hot water models
External draft hood

Lifetime Limited Warranty
Galaxy water boilers are so
reliable they come with a lifetime
limited warranty. Steam models
have a 10-year limited warranty.

GX-GXH SERIES
Hot water with tankless coil
Steam with tankless
coil optional
External draft hood

GXHA SERIES
Steam with tankless
coil optional
Integral draft diverter

Galaxy’s handsome extended jacket conceals controls, wires and
gas valve, giving the boiler a neat, clean appearance. Baked enamel
finish harmonizes nicely with the decor of a finished basement.

A boiler is an important investment in your home.

Advanced Design
Heat Exchanger
The advanced design of Galaxy’s heat
exchanger maximizes the transfer of heat
from the gas flame to the water in your heating system.
Specially tapered thermal pins in the heat
exchanger system are shaped to ensure that
the hot combustion gases “lick” each and
every surface. The flue passage design and
thermal pin pattern ensure uniform heat
transfer, reducing thermal strain and prolonging the life of the casting.

G
ALAXY
Built for superb performance
™

and long life.
Each Galaxy boiler is tested in our factory, not
in your basement.
We test individual Galaxy boiler sections under pressure of
up to 250 p.s.i (at least 20 times the normal residential operating
pressure). Repetitive testing of individual sections, assembled
heat exchanger and completed boiler ensure the leak-free
integrity of every boiler shipped. Plus, complete testing of the
electrical system, valves, wiring and accessories all add to
Galaxy’s high reliability.

Repetetive testing ensures the leak-free integrity of every
Galaxy boiler shipped.

Fast, simple installation. Easy maintenance.
Your Slant/Fin heating contractor can install a new Galaxy
boiler in about a day. Packaged hot water models come fully
pre-wired and pre-set. For easy access, the front panel goes on
and off in seconds. Burners, controls, pilot, combination gas
valve and circulator are all mounted and easily within reach
from the front of the boiler. On PZ steam models, the convenient
speed skimmer trough makes skimming easy for the installer or
homeowner.

GALAXY STEAM MODELS
Galaxy steam models are the industry’s best solution to
system noise and boiler maintenance problems. Galaxy is an
ideal replacement boiler for an old steam heating system or for
new steam heat jobs. High efficiency models, with intermittent
pilot and vent damper, are also among the most efficient steam
boilers you can buy. There are 29 Galaxy steam models, with
choice of standing pilot or intermittent pilot ignition, all with tankless heater optional. An external draft hood is shipped with each
GX and GXH model.

Clearance requirements of just 18" above the boiler make the GXHA
steam model ideal for tight installations.

Larger tappings, dry steam.
The Galaxy produces dry steam and delivers it to the system
through a 21⁄2" supply tapping. This ensures lower steam velocity
and reduces the incidence of water in the mains, resulting in
quieter system operation.
Speed skimmer trough.
In any steam boiler installation, it’s important that the water
is kept free from dirt and contaminants that can cause surging
and noise. With ordinary steam boilers, elimination of these
contaminants is a cumbersome and time-consuming problem.
With the speed skimmer trough built into Galaxy “PZ” steam
boilers, skimming time and efforts are reduced dramatically.
Surface films of grease, oil and other contaminants cascade into
the trough and are discharged through an ordinary 3⁄4" drain cock.
It makes skimming as easy as turning a faucet.
Low profile GXHA models.
Galaxy GXHA steam models do not require an external draft
hood. A built-in integral draft diverter on the four GXHA models
reduce clearance requirements above the boiler to 18", making
them ideal for use in locations with low chimney breaching or
with overhead obstructions.

Speed skimmer trough reduces cleaning time dramatically.

Insulated
jacket

Pressure
temperature
gauge

Thermal
pins

High limit
control
Ignition
control

Automatic, motorized
vent damper.
Increases efficiency of
boiler by reducing standby
losses. Motor closes the
chimney vent when the
burner is off, fully opens
it in anticipation of
combustion. An interlock
prevents burner operation
unless the damper is in
an open position.

Metal
push nipples

Long-life burners.
Stainless steel burners are
quiet, lightweight, long
lasting and easy to install
or remove. Special port
construction will not permit
flame to “lift” or flash back.
Insulated
base

Circulator pump

Long life
burners

Cast-iron
heat
exchanger

Gas valve

Rollout
safety switch

Energy saving
intermittent pilot.*

Metal push nipples.
All cast-iron boilers are made with multiple
sections that are joined together. Slant/Fin uses
only metal push nipples that expand and
contract with the individual boiler sections that
they connect. The rubber gaskets that are
substituted for push nipples in many other
boilers could deteriorate. This results in water
leaking from the boiler and major repair bills.

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

When thermostat calls for
heat, solid state igniter
sparks to light pilot. Sensor
reads pilot flame and opens
main gas valve.
Factory installed. Polarized
receptacle provided for quick
connect to vent damper.
* Some codes may require an
intermittent ignition device.
Please order accordingly.

RATINGS - NATURAL AND L.P. PROPANE GAS
GG SERIES

Hot Water Model
RATINGS FOR WATER

MODEL
NUMBER ±

A.G.A.
INPUT
(Btuh)

D.O.E.
CAPACITY
(Btuh)

NET I=B=R
RATING
WATER
(Btuh)*

GG-75H
GG-100H
GG-125H
GG-150H
GG-175H
GG-200H
GG-225H
GG-250H

75,000
100,000
125,000
150,000
175,000
200,000
225,000
250,000

64,000
83,000
103,000
125,000
145,000
167,000
186,000
209,000

56,000
72,000
90,000
109,000
126,000
145,000
162,000
182,000

RATINGS FOR WATER
WATER
(Sq.Ft.)
371.3
481.3
597.3
742.6
840.6
968.0
1078.0
1211.3

MODEL
NUMBER †

A.G.A.
INPUT
(Btuh)

GG-275H
GG-300
GG-325
GG-350
GG-350H
GG-375
GG-375H
GG-399H

275,000
300,000
325,000
350,000
350,000
375,000
375,000
399,000

D.O.E.
CAPACITY
(Btuh)
228,000
240,000
260,000
280,000
291,000
300,000
304,000
327,000

**
**
**
**
**
**
**

NET I=B=R
RATING
WATER
(Btuh)*

WATER
(Sq.Ft.)

198,000
209,000
226,000
243,000
253,000
261,000
264,000
284,000

1322.0
1390.0
1510.0
1620.0
1684.0
1740.0
1760.0
1893.3

GX and GXH Hot Water Models (tankless heaters) GX, GXH and GXHA Low Pressure Steam Models (optional tankless heater)

MODEL
NUMBER †
GXHA-100
GXH-105
GXHA-120
GXH-125
GXH-150
GXHA-160
GXH-170
GXH-190
GXHA-200
GXH-210
GX-225
GXH-230
GX-250
GXH-250
GXH-275
GXH-300
GXH-300H§

RATINGS STEAM OR WATER
D.O.E.
D.O.E.
A.G.A.
CAPACITY
CAPACITY
INPUT
WATER
STEAM
(Btuh)
(Btuh)
(Btuh)
100,000
—
81,000
105,000
86,000
86,000
120,000
—
97,000
126,000
104,000
104,000
147,000
120,000
120,000
160,000
—
130,000
168,000
137,000
137,000
189,000
155,000
155,000
200,000
—
163,000
210,000
172,000
172,000
225,000
184,000
179,000
231,000
189,000
189,000
250,000
204,000
198,000
252,000
206,000
206,000
273,000
223,000
223,000
300,000
240,000 **
240,000 **
300,000
243,000 **
243,000 **

± GG models: Add suffix “S” for standard water boiler, “P” for
packaged water boiler. Add suffix “E” for intermittent pilot ignition system (available only with 24 volt gas valve). Type of
gas: After model number, specify gas by name “Natural” or
“Propane”
* Net ratings are based on a piping and pick-up allowance of
1.33 (steam) and 1.15 (hot water). 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 addition
al 4% for every additional 1,000 feet elevation over 2,000
feet.

NET I=B=R*

WATER
(Sq.Ft.)
—
495
—
600
695
—
795
895
—
995
1065
1095
1180
1195
1290
1395
1405

WATER
(Btuh)
—
75,000
—
90,000
104,000
—
119,000
135,000
—
150,000
160,000
164,000
177,400
179,000
194,000
209,000
211,000

STEAM
(Btuh)
61,000
65,000
73,000
78,000
90,000
98,000
103,000
116,000
122,000
129,000
134,300
142,000
148,500
155,000
167,000
180,000
182,000

STEAM
(Sq.Ft.)
254
271
304
325
375
408
429
483
508
538
560
591
620
646
696
750
758

TANKLESS
HEATER
CAPACITY
(G.P.M.)‡
21/2
21/2
3
3
31/4
31/2
31/2
33/4
4
4
4
41/4
41/2
41/2
5
51/2
51/2

† GXH and GX models: Add suffix “PT” for standard water
boiler with tankless heater, “PZ” for steam boiler, “PZT” for
packaged steam boiler with tankless heater. Add suffix “E”
for intermittent pilot ignition system (available only with 24
volt gas valve). Type of gas: After model number, specify
gas by name “Natural” or “Propane”.
** CSA output rating (Btuh).
§ Ratings for GXH-300H are for natural gas only.
‡ Tankless heater ratings based on intermittent draw.
NOTE: All boilers under 300,000 Btu input are tested and
rated for capacity under the U.S. Dept. of Energy (D.O.E.)
Test Procedure for boilers.

GALAXY DOE SEASONAL
EFFICIENCY (AFUE)*

MODEL

EFFICIENCY

GG-75 HED
GG-100 HED
GG-125 HED
GG-150 HED
GG-175 HED
GG-200 HED
GG-225 HED
GG-250 HED
GG-275 HED

84.78%
82.78%
82.39%
82.98%
82.45%
83.19%
82.51%
83.40%
82.57%

GXH-105 ED
GXH-125 ED
GXH-150 ED
GXH-170 ED
GXH-190 ED
GXH-210 ED
GX-225 ED
GXH-230 ED
GX-250 ED
GXH-250 ED
GXH-275 ED

81.00
81.00
81.14
81.14
81.14
81.17
81.30
81.21
80.70
81.24
81.28

GXHA-100
GXHA-120
GXHA-160
GXHA-200

81.00
81.20
81.20
81.30

ED
ED
ED
ED

* Includes intermittent pilot and
vent damper. Annual Fuel
Utilization Efficiency based on
constant circulation for hot
water models.

equipment
ALL MODELS include pre-assembled heat exchanger; base; flue collector; gas
burners; gas orifices and manifold assembly; combination gas valve including
manual shut-off, pressure regulator, pilot adj., automatic pilot-thermocouple safety;
pressure relief valve (ASME); draft hood (integral draft diverter in GXHA models);
blocked vent safety switch; rollout safety switch; pre-assembled insulated semiextended jacket (extended as shown); automatic vent damper (except GG-300
through GG-399 and GXH-300).

equipment listed for ALL MODELS, plus built-in air eliminator; pressure and
temperature gauge; circulator; drain cock; 3-way combination control (hi-limit,
circulator relay and lo-limit with differential); tankless heater.

BASIC WATER BOILER (SUFFIX S) includes all equipment listed for ALL MODELS,
plus built-in air eliminator; hi limit control; pressure and temperature gauge.

PACKAGED STEAM BOILER WITH TANKLESS HEATER (SUFFIX PZT) includes
all equipment listed for ALL MODELS and for model PZ, plus tankless heater instead
of cover plate; low limit control.

PACKAGED WATER BOILER (SUFFIX P) includes all equipment listed for ALL
MODELS and for model S, plus 2-way combination control (hi limit and circulator
relay), instead of hi limit control; circulator; drain cock.
PACKAGED WATER BOILER WITH TANKLESS HEATER (SUFFIX PT) includes all

Before purchasing this appliance read important energy costs
and efficiency information available from your contractor.

PACKAGED STEAM BOILER (SUFFIX PZ) includes all equipment listed for ALL
MODELS, plus steam pressure limit control with siphon; pressure gauge; low water
cutoff and water level sight glass (unmounted); drain cock, transformer and junction
box.

OPTIONAL EQUIPMENT Room thermostat. Air package consisting of diaphragm
expansion tank, fill and pressure reducing valve, and automatic air vent. Combustible
floor kit. Intermittent pilot ignition system.

THE HYDRONICS
INSTITUTE

dimensions

GALAXY
®

High efficiency, cast-iron gas boiler

MODEL GG SERIES — HOT WATER

DIMENSIONS
INCHES
A JACKET WIDTH
B DRAFT HOOD HEIGHT
C FLUE COLLAR DIAMETER
D JACKET TOP TO DRAFT HOOD
E CIRCULATOR RETURN FLANGE
G RIGHT SIDE TO SUPPLY
H FRONT TO SUPPLY
GAS VALVE CONNECTION—Size is 1⁄2"

GG-75H GG-100H GG-125H GG-150H GG-175H GG-200H GG-225H GG-250H GG-275H GG-300

GG-325

GG-350 GG-350H GG-375H GG-399H

133/16
133/16
133/16
169/16
169/16
1915/16
1915/16
463/8
531/4
531/4
531/4
531/4
571/2
571/2
5
6
6
6
6
7
7
63/4
13
13
13
13
16
16
11/4
11/4
11/4
11/4
11/4
11/4
11/4
23/4
23/4
23/4
23/4
23/4
23/4
23/4
91/4
91/4
91/4
91/4
91/4
91/4
91/4
f.p.t. for all models, except GG-250 and larger, which are 3⁄4" f.p.t.

2611/16
595/8
8
17
11/2
23/4
91/4

301/16
661/8
9
221/2
11/2
23/4
91/4

235/16
595/8
8
17
11/2
23/4
91/4

235/16
595/8
8
17
11/2
23/4
91/4

2611/16
595/8
8
17
11/2
23/4
91/4

MODEL GX and GXH SERIES
HOT WATER WITH TANKLESS HEATER — LOW PRESSURE STEAM WITH OPTIONAL TANKLESS HEATER

DIMENSIONS
INCHES

GXH-105 GXH-125 GXH-150 GXH-170 GXH-190 GXH-210

GX-225

A JACKET WIDTH
169/16
169/16
1915/16 1915/16
1915/16 235/16
235/16
B DRAFT HOOD HEIGHT
465/8
531/4
551/2
551/2
551/2
551/2
565/8
C FLUE COLLAR DIAMETER
5
6
7
7
7
7
8
D JACKET TOP TO DRAFT HOOD
63/4
13
14
14
14
14
14
E CIRCULATOR RETURN FLANGE
11/4
11/4
11/4
11/4
11/4
11/2
11/2
1/
1/
1/
1/
3/
3/
3/
F TANKLESS COIL CONNECTIONS
2
2
2
2
4
4
4
G RIGHT SIDE TO SUPPLY
31/2
31/2
31/2
31/2
31/2
31/2
31/2
H FRONT TO SUPPLY
93/4
93/4
93/4
93/4
93/4
93/4
93/4
GAS VALVE CONNECTION—Size is 1⁄2" f.p.t. for all models, except GXH-230 and larger, which are 3⁄4" f.p.t.

301/16
661/8
9
221/2
11/2
23/4
91/4

301/16
595/8
10
15
11/2
23/4
91/4

301/16
625/8
10
18
11/2
23/4
91/4

MODEL GXHA SERIES
LOW PRESSURE STEAM WITH OPTIONAL TANKLESS HEATER

GXH-250 GXH-275 GXH-300H GXHA-100 GXHA-120 GXHA-160 GXHA-200

GXH-230

GX-250

235/16
551/2
7
14
11/2

235/16
565/8
8
14
11/2

261/16
551/2
7
14
11/2

261/16
551/2
7
14
11/2

261/16
591/8
9
15
11/2

161/2

161/2

20

231/4

—

—

—

—

5

5

6

7

—

—

—

—

—

—

—

—

3/
4

3/
4

3/
4

3/
4

3/
4

1/
2

1/
2

1/
2

3/
4

31/2
93/4

31/2
93/4

31/2
93/4

31/2
93/4

31/2
93/4

31/2
93/4

31/2
93/4

31/2
93/4

31/2
93/4

VENT TAPPING: 1⁄2" for all water models.
† Standing pilot.
§ Crates for all models are 30" wide, 38" high, depth 30” (GG-75 through GG-225) and (GXH-105 through GXH-190), 38” (GG-250 through GG-399), 40-1/4" (GXH-210 through GXH-300).

GALAXY

Make your house a
more comfortable home

High efficiency, cast-iron gas boiler

®

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

1
2
3
4
5
6

Zone heating with Slant/Fin hot water baseboard and individual room temperature controls.
Warm floors with Terra Therma radiant heating by Slant/Fin.
Slant/Fin hot water fan-convection heaters under cabinets or stairs.
Hot water with a high volume Slant/Fin indirect-fired water heater.
Snow melting for driveway and sidewalks with Terra Therma radiant tubing.
Pool or spa water heating with a Slant/Fin boiler and external heat exchanger.

1

6
6

2
1

1

3

3

4

1

1
1

2

2

1
2
1

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.

Galaxy can provide hot water for
your kitchen, bath and laundry.
Optional tankless heater. This coil type “instant” hot
water maker is located inside the boiler where the
constant flow of hot boiler water heats your fresh water
as it passes through the coil. Recovery is fast and the
total capacity will vary
with the boiler size.
Available on GX Series
hot water or steam
boilers.
Stainless steel bolts
on the cover plate
won’t rust or break off
when servicing the
tankless heater.

Indirect-fired water heaters
If you prefer to have a larger reserve of hot water, your
installer can provide a Slant/Fin Model WH indirectfired water heater. It’s connected just like a heating
zone to the Galaxy 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 directfired water heater.
The 40 gallon model,
INDIRECTFIRED
for instance, delivers
WATER
HEATER
195 gallons of hot
water per hour!
®

BOILER

Typical indirect water heater system.

SLANT/FIN CORPORATION, Greenvale, N.Y. 11548 • Phone: (516) 484-2600
FAX: (516) 484-5921 • Canada: Slant/Fin Ltd/Ltee, Mississauga, Ontario
© Slant/Fin Corp. 2005. Printed in U.S.A 0105. Publication No. GG-10

www.slantfin.com



---

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