A. O. Smith ATI-320H-N User Manual
Condensing High-
®
Efficiency Gas Tankless
NEW
INDOOR MODELS
ATI-320H-N, ATI-320H-P
OUTDOOR MODELS
ATO-320H-N, ATO-320H-P
COMPARISON
FEATURES NAVIEN NORITZ
Robust temperature safety controls
to prevent PVC meltdowns
SS#316L for secondary HX NO NO YES!
3-digit display window that shows
temperature and error codes for
easy troubleshooting
Outdoor Specific Model Available NO
Included PVC adapter NO NO YES!
NO
Only one HL switchNOOnly one HL switch
NO NO
(requires vent cap)
SPECIFICATIONS
GAS CONSUMPTION INPUT
MODEL
NUMBER
INDOOR
ATI-320H-N 13,000 180,000 5.0 10.5 0.91 8.0 3/4” NPT 25.6 18.5 12.4 73
ATI-520H-N 13,000 199,000 5.0 10.5 0.91 9.0 3/4” NPT 25.6 18.5 12.4 73
OUTDOOR
ATO-320H-N 13,000 180,000 5.0 10.5 0.91 8.0 3/4” NPT 25.6 18.5 12.4 73
ATO-520H-N 13,000 199,000 5.0 10.5 0.91 9.0 3/4” NPT 25.6 18.5 12.4 73
For propane, change "N" to "P" in model number (ATO-320H-P)
MINIMUM
BTU/H
MAXIMUM
BTU/H
INLET GAS
PRESSURE
MINIMUM
W.C.
MAXIMUM
W.C.
ENERGY
FACTOR
INDOOR MODELS
ATI-520H-N, ATI-520H-P
One HL switch with additional thermistor
to monitor exhaust temperatures
NO
HOT/COLD
MAX
GPM*
AND
GAS
CONN.
HEIGHT WIDTH DEPTH
OUTDOOR MODELS
ATO-520H-N, ATO-520H-P
A. O. SMITH
YES!
YES!
YES!
DIMENSIONS IN INCHES
APPROX.
SHIPPING
WEIGHT
(LBS)
.91
Energy Factor
PVC
Venting
0”
Clearance Venting
FEATURES
– ENERGY STAR
Qualified
– Standard PVC
Venting can be
used in all
applications
(adaptor
included in
the box)
– Up to 16 different
temperature
settings without
a remote
– Built-in tempera-
ture and error
code display
– CSA certified
software
– AFR (Air-Fuel Ratio)
Sensor
®
AOSRG71004
Non-Condensing
On/
Off
Temperature
Control
(increase/
decrease)
Temp
Display
Temp
Range
Fahrenheit
& Celsius
Inlet
Water
Temperature
Outlet
Water
Temp
Water
Flow
(GPM)
*Energy
Saving
Mode
Clock/
Time
Diagnostics
Error
Codes
Error
Code
History
Scale
Detection
Code
Audible
Alert
Priority
Button/
Indicator
Additional
Controllers
A. O.SMITH
Remote
Controller
Yes Yes Yes
99 - 175
or 185
Yes Yes Yes Yes Yes Yes Yes Yes (3) No Beeps No No
®
Gas Tankless
110 MODELS – SPECIFICATIONS
GAS CONSUMPTION
INPUT
MODEL
NUMBER
MINIMUM
BTU/H
MAXIMUM
BTU/H
INDOOR
ATI-110-N 19,500 140,000 5.0 10.5 0.82 6.6 3/4” NPT 20.5 13.8 6.7 38
ATI-110-P 19,500 140,000 8.0 14.0 0.83 6.6 3/4” NPT 20.5 13.8 6.7 38
OUTDOOR
ATO-110-N 19,500 140,000 5.0 10.5 0.82 6.6 3/4” NPT 20.5 13.8 6.7 38
ATO-110-P 19,500 140,000 8.0 14.0 0.82 6.6 3/4” NPT 20.5 13.8 6.7 38
INLET GAS
PRESSURE
MINIMUM
W.C.
MAXIMUM
W.C.
ENERGY
FACTOR
MAX
GPM
HOT/COLD
AND
GAS
CONN.
DIMENSIONS IN
INCHES
HEIGHT WIDTH DEPTH
310 MODELS – SPECIFICATIONS
GAS CONSUMPTION
INPUT
MODEL
NUMBER
MINIMUM
BTU/H
MAXIMUM
BTU/H
INDOOR
ATI-310-N 11,000 190,000 5.0 10.5 0.82 8.0 3/4” NPT 20.5 13.8 8.5 43
ATI-310-P 11,000 190,000 8.0 14.0 0.82 8.0 3/4” NPT 20.5 13.8 8.5 43
OUTDOOR
ATO-310-N 11,000 190,000 5.0 10.5 0.82 8.0 3/4” NPT 20.5 13.8 8.5 43
ATO-310-P 11,000 190,000 8.0 14.0 0.82 8.0 3/4” NPT 20.5 13.8 8.5 43
INLET GAS
PRESSURE
MINIMUM
W.C.
MAXIMUM
W.C.
ENERGY
FACTOR
MAX
GPM
HOT/COLD
AND
GAS
CONN.
DIMENSIONS IN
INCHES
HEIGHT WIDTH DEPTH
APPROX.
SHIPPING
WEIGHT
(LBS)
APPROX.
SHIPPING
WEIGHT
(LBS)
510 MODELS – SPECIFICATIONS
GAS CONSUMPTION
INPUT
MODEL
NUMBER
MINIMUM
BTU/H
MAXIMUM
BTU/H
INDOOR
ATI-510-N 11,000 199,000 5.0 10.5 0.82 10.0 3/4”NPT 20.5 13.8 8.5 45
ATI-510-P 11,000 199,000 8.0 14.0 0.82 10.0 3/4” NPT 20.5 13.8 8.5 45
OUTDOOR
ATO-510-N 11,000 199,000 5.0 10.5 0.82 10.0 3/4” NPT 20.5 13.8 8.5 45
ATO-510-P 11,000 199,000 8.0 14.0 0.82 10.0 3/4” NPT 20.5 13.8 8.5 45
INLET GAS
PRESSURE
MINIMUM
W.C.
MAXIMUM
W.C.
ENERGY
FACTOR
MAX
GPM
HOT/COLD
AND
GAS
CONN.
DIMENSIONS IN
INCHES
HEIGHT WIDTH DEPTH
APPROX.
SHIPPING
WEIGHT
(LBS)
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