A. O. Smith FCG-100 User Manual

Residential Gas Water Heaters

®

FEATURES

HIGHEST RECOVERIES AND FIRST HOUR RATINGS

Capacity/input combinations up to 98 gallons/75,100 BTUs produce recoveries up to 81 gallons
per hour, with deliverable hot water up to 150 gallons.

DYNACLEAN™ DIFFUSER DIP TUBE

Helps reduce lime and sediment buildup, maximizes hot water output. Made from long lasting
PEX cross-linked polymer.

GREEN CHOICE® GAS BURNER

Pateneted “Eco-Friendly” design reduces NOx emissions by up to 33% and complies with less
than 40 ng/j requirements for NOx emissions.

COREGARD™ ANODE ROD

A.O. Smith’s exlusive aluminum anode has a stainless steel core, protects tank against
corrosion.

HEAT TRAP NIPPLES

Factory-installed on most models

PUSH-BUTTON PIEZO IGNITOR

Makes lighting pilot fast and easy with one-hand push-button spark ignition.

DURABLE, TAMPER-RESISTANT BRASS DRAIN VALVE

BLUE DIAMOND® GLASS COATING

Provides superior corrosion resistance compared to industry-standard glass lining.

THICK, “ENVIRONMENTALLY-FRIENDLY” NON CFC-FOAM INSULATION
Improves efficiency.

CSA CERTIFIED AND ASME RATED T&P RELIEF VALVE

Top-mounted T&P relief valve available as option.

CODE COMPLIANCE

Meets UBC, CEC, SBCC, HUD and BOCA National Codes. Meets the thermal efficiency and standby
loss requirements of the U.S. Department of Energy and current edition of ASHRAE/IESNA 90.1
and meets the Federal Energy Efficiency Standards effective January 20, 2004, according to the
National Appliance Energy Conservation Act (NAECA) of 1992.

DESIGN-CERTIFIED BY CSA INTERNATIONAL

According to ANSI Z21.10.1 - CSA 4.1 standards governing storage-type water heaters.

FLAMMABLE VAPOR IGNITION RESISTANT COMPLIANT DESIGN

See other side.

6-YEAR LIMITED TANK AND PARTS WARRANTY

For complete information, consult written

Series 100/101

®

Revised November 2012

Low Lead Content

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AOSRG45400

®

Residential Gas Water Heaters

MODEL

NUMBER

SERIES

FIRST
HOUR

RATING

GALLON

CAPACITY

(GPH)

GCVT-40

GCVT-50

GCVX-50

GCV-65

FCG-75*

FCG-100*

300

300

100

100

300

300

Recovery capacity based on actual performance tests. Water Connections – 1" on 75-gallon model, 1-1/4" on 100-gallon model, 3⁄4" on all other models.
* Not equipped with FVIR Technology. 75 and 100-gallon models have factory-installed (non-heat trap) nipples, 75-gallon model has 80% efficiency,
998 BTU/hr. standby loss; 100-gallon model has 80% efficiency, 1146 BTU/hr. standby loss.

† Propane Gas – GCVT-40: 45,000 BTU input; GCVT-50: 45,000 BTU input; GCVX-50: 55,000 BTU input; GCV-65: 62,500 BTU input.

For 10-Year Tank and 6-Year Parts Warranty, change “G” to “X” in Model Number (example: XCVT-40), or change “F” to “P” in model number (example: PCG-75).
The FVIR Series 100 models are certified from sea level to 7,700 ft. elevations. The FVIR Series 300 models are certified from sea level to 10,100 ft. elevations.
The 75 & 100-gallon models are certified to 7,700 ft. elevations.

75 40 51

90 50 51

93 50 67

116 65 67

N/A 74 81

N/A 98 81

RECOVERY

90°F RISE

PER HOUR

ENERGY
FACTOR

BTU INPUT

PER HOUR
NATURAL

†

0.60 50,000 16

0.58

0.58

0.57

50,000 8

65,000 16

65,000

N/A 75,100 16

N/A

75,100 10

R

VALUE

A B C D E F

61-3/4 58-1/4 20 13 8 51-3/4

60-3/4 57 20 13 8 50-1/4

63-7/8 59-1/2 22 15-1/2 8 54-1/8

65 60 24 15-1/2 8 54-1/4

16

61 57 26-1/2 14-3/4 16 50-1/4

68-1/2 65 27-3/4 15-3/16 16 57-3/8

Flammable Vapor Ignition Resistant FVIR

DIMENSIONS (INCHES)

HOT CONNECTION

DRAFT

HOOD

OUTLET

4

4

4

4

4

4

Water Heaters

FVIR design meets American National Standards Institute standards

(ANSI Z21.10.1 - 4.1 CSA Standards) that deal with the accidental or
unintended ignition of flammable vapors, such as those emitted by gasoline.

FVIR gas water heaters feature a sealed combustion chamber with air intake
screen and a fireproof Corderite flame arrestor built into the water heater base.
In addition, a thermal cutoff (TCO) device, integral with the thermocouple, is
designed to shut off gas flow to the burner and pilot if poor combustion is detected.

E

C

APPROX.

SHIPPING

WEIGHT

(LBS)

138

153

195

215

275

350

ANODE ROD*

COLD
CONNECTION

If flammable vapors
accidentally enter the
combustion chamber,
the Corderite flame
arrestor is designed
so flames burn off
the top surface and
cannot escape down
through the arrestor.

A. Easy-to-light

piezo ignitor

For Technical Information and Automated Fax Service, call 800-527-1953. A. O. Smith Corporation reserves the right to make product changes or improvements without prior notice.

Revised November 2012

B. View port for easy

burner inspection
inside sealed
combustion chamber

www.hotwater.com

T&P VALVE

1/2" GAS
CONNECTION

D

*Location for optional top-mounted
T&P Valve if ordered from factory.

(FVIR models only)

A

B

F

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