A. O. Smith GCNH-30 User Manual
Residential Gas Water Heaters
®
®
ULTRA-LOW NOx
A. O. Smith Ultra-Low NOx heaters utilize an innovative burner
system, a combination of radiant heat and excess air to satisfy Air
Quality Management Districts with the requirements of less than
10ng/j for ultra-low NOx emissions.
INTELLIGENT CONTROL LOGIC
The internal microprocessor provides enhanced operating parameters and tighter
differentials for precise sensing and fasting heating response to optimize performance.
SELF-POWERED ELECTRONIC GAS VALVE
Uses a Thermopile to generate the power needed to operate the electronics.
DIAGNOSTICS
The electronic gas control incorporates an LED status indicator that monitors system
operation & service diagnostics.
FVIR COMPLIANT
Equipped with a flame arrestor that provides smooth ignition and ensures that in the
event of accidental exposure to flammable vapors, the vapors are safetly combusted
inside the sealed chamber.
DYNACLEAN™ II DIFFUSER DIP TUBE
Helps reduce lime and sediment buildup, maximizes hot water output. Made from
long-lasting PEX cross-linked polymer.
COREGARD™ ANODE ROD
A. O. Smith’s exclusive aluminum anode has a stainless steel core, protects tank
against corrosion longer versus ordinary steel anodes.
ENHANCED GREEN CHOICE® GAS BURNER
Comprised of inconel alloy and stainless steel ensures long life and exceptional safety.
PUSH-BUTTON PIEZO IGNITOR
Makes lighting pilot fast and easy with one-hand push-button spark ignition.
SIMPLIFIED INSTALLATION
Can be easily installed in the same location as the previous water heater, no special
venting or electrical power is required.
DURABLE TAMPER-RESISTANT BRASS DRAIN VALVE
®
PERMAGLAS
Protects steel tank from corrosion.
CSA/ASME CERTIFIED T&P RELIEF VALVE
Top-mounted T&P Relief Valve available as option.
CODE COMPLIANCE
UBC, CEC, SBCC, CABO, HUD, BOCA National Codes. Meets the thermal efficiency and
standby loss requirements of the U.S. Department of Energy and current edition
ASHRAE/IESNA 90.1. 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.
6-YEAR LIMITED TANK AND PARTS WARRANTY
For complete information, consult written warranty
GLASS COATING
Flame Arrestor
Pilot Assembly/
Combustion Chamber
200 Series Model Shown
®
r
t
Gas Control
View Por
Revised November 2012
Page 1 of 2
AOSRG45800
Residential Gas Water Heaters
®
®
ULTRA-LOW NOx
MODEL
NUMBER
TALL MODELS
GCNH-30 48-1/2
GCNH-40 50-3/4
GCNH-50 849-1/220
GCNT-50* 53-1/422
GNR-40 850-3/4
GNR-50
Recovery capacity based on actual performance tests.
Water Connections – 3/4" on all models.
All models may be ordered from the factory with top T&P.
*GCNT-50 comes standard with side tap connections for optional hydronic heating loop
applications. Plugs are supplied loose and must be installed at installation if side
taps are not used.
SERIES
200
200
200
200
200
200
FIRST
HOUR
RATING
GALLONS
ENERGY
FACTOR
50 .61 30 30,000 31 8
65 .59 40 40,000 41 8
75 .58 50 40 000 41 8
90 .59 50 50,000 52 16
70 .62 40 40 000 41 16
75 .62 50 40 000 41 16
GALLON
CAPACITY
BTU
INPUT
PER HOUR
NATURAL
RECOVERY
90ºF RISE
GALLONS
†
PER HOUR
R
VAL UE
DIMENSIONS IN INCHES
CAB
1659-7/8 56-3/8
62-1/8 58-5/8
60-7/8 57-3/8
64 60
61-7/8 58-3/8
60-7/8
57-3/8
OPTIONAL ANODE
ROD* LOCATION
HOT
CONNECTION
ANODE ROD
(OPTIONAL T&P
LOCATION)
18
20
22
D
13
13
13
11-1/2
13
13
EF
8
8
8
8 49-1/2
E
C
VENT
CONNECTION
(INCHES)
3 or 4
3 or 4
3 or 4
4
3or4
3 or 4
COLD
CONNECTION
APPROXIMATE
SHIPPING
WEIGHT
(LBS)
105
129
151
178
138
160
T&P VALVE
• Burner system complies with 10ng/j Ultra-low NOx SCAQMD
requirements.
• Burner screen acts as a secondary flame arrestor in the event
of accidental exposure to flammable vapors.
• If flammable vapors accidentally enter the combustion
chamber, the flame trap and burner are designed so flames
burn off inside the chamber and cannot escape outside of
the heater.
1/2" GAS
CONNECTION
F
D
A
B
Maximum Hydrostatic Working Pressure: 150 PSI.
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
www.hotwater.com
AOSRG45800
Page 2 of 2
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