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October 2012
CANRG46805
TANKLESS HIGH-EFFICIENCY
CONDENSING MODELS
FEATURES
■ Condensing technology provides significant energy cost savings
PRIMARY HEAT EXCHANGER IS CONSTRUCTED OF HRS35 COMMERCIAL
GRADE COPPER
■ Stronger than standard copper and more resilient against erosion
SECONDARY HEAT EXCHANGER IS MADE OF TYPE 316L STAINLESS STEEL
■ Provides additional protection against corrosion
CONTINUOUS MAXIMUM FLOW RATES UP TO 9.0 GPM
CAN BE USED IN RESIDENTIAL AND
LIGHT COMMERCIAL APPLICATIONS
ENERGY STAR
®
QUALIFIED
MODELS INCLUDE REMOTE CONTROL AND POWER CORD
EASY-LINK UP TO 4 UNITS
■ With no additional parts or accessories needed
ELECTRONIC IGNITION-NO PILOT LIGHT
BUILT-IN DISPLAY SHOWS OPERATING TEMPERATURE ALONG WITH
DIAGNOSTIC ERROR CODES
SAFETY FEATURES
■ Air-Fuel Ratio (AFR) Sensor
■ Exhaust & Water Temperature Safety Controls
■ Overheat Cutoff Fuse
INTERNAL FREEZE PROTECTION SYSTEM
POWER DIRECT VENT DESIGN
■ 4” Pipe Vents up to 50 Equivalent Feet or 3” Pipe Vents up to 25 Equivalent Feet
■ ULC s636 approved PVC, CPVC, or Polypropylene Pipe for Intake and Exhaust
(solid core only)
■ Category III Stainless Steel venting can also be used
■ Vertical or Horizontal installation
ACCESSORIES
■ Remote Temperature Controller (Included)
■ Neutralizer Kit
■ Plumbing Installation Kits
■ PVC Intake Adaptor
■ Concentric Termination
WARRANTY
■ 12-year limited warranty on heat exchanger in residential applications
■ 5-year limited warranty on heat exchanger in commercial applications
■ 5-year warranty on all parts
Residential / Light Commercial
Gas Tankless Water Heaters
ATI-520H-N
ATI-520H-P
ANSI Z21.10.3 CSA 4.3
For Technical Information, call 1-888-479-8324. A. O. Smith reserves the right to make product changes or improvements without prior notice.
October 2012
Page 2 of 2
www.hotwatercanada.ca
CANRG46805
Residential / Light Commercial
Gas Tankless Water Heaters
CAPACITY & DIMENSIONS
INDOOR CONDENSING MODELS
MODEL
FUEL
TYPE
GAS CONSUMPTION INPUT INLET GAS PRESSURE
ENERGY
FACTOR
HOT/COLD
GAS CONN.
DIMENSIONS IN INCHES
APPROX.
SHIPPING
WEIGHT
(LBS)
MINIMUM
BTU/H
MAXIMUM
BTU/H
MINIMUM
W.C.
MAXIMUM
W.C.
HEIGHT WIDTH DEPTH
ATI 520H N NATURAL 13,000 199,000 5.0 10.5 .91 3/4” NPT 25-3/5 18-1/2 12-2/5 73
ATI 520H P PROPANE 13,000 199,000 8.0 14.0 .91 3/4” NPT 25-3/5 18-1/2 12-2/5 73
25-1/2"(649mm)
12-1/2"(316mm)
6-1/4" (161.5mm)
1/2" (12.5mm)
10-1/2"(266.8mm)
120VAC 8-1/2" (216.3mm)
COLD 8-5/8" (220.6mm)
HOT 7-1/4" (182.1mm)
GAS 6" (153.6mm)
6-5/8" (168.4mm)
1-1/4" (29.2mm) COLD
29-1/2" (751mm)
3/4" (18.8mm)
Ø4"(102mm) Female
Male Ø4"(100.8mm)
4-5/8" (116.8mm) GAS
120VAC 2-1/4" (58.2mm)
2-3/4" (71.8mm) EXHAUST
2-3/4" (69.1mm) INTAKE
6-1/4" (159.1mm)
HOT5-5/8" (142.2mm)
12-1/2" (320mm)
3-1/2" (90mm)
18-1/2" (470mm)
Condensate DrainPort
Condensate DrainPort
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
020406080100 120
140
Flow Rate vs. Temperature Rise
Pressure Loss
FlowRate(gpm)
TemperatureRise (
°
F)
Flow Rate (gpm)
PressureLoss (psi)
Head Feet
SetTemperature : 125
°
F&lower
SetTemperature: 130
°
F&Higher
0
20
40
60
80
100
120
0
5
10
15
20
25
30
35
40
45
50
0.01.0 2.03.0 4.05.0 6.07.0 8.09.0 10.0
CLEARANCES: Top: 12”; Bottom: 12”; Front: 4”; Back: .05”; Sides:3”
All dimensions in inches.
15-150 psi Water Pressure. 40 psi or above recommended for maximum flow.
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