A. O. Smith ATI-320H-P User Manual

Residential Gas Tankless Water Heaters

TANKLESS HIGH EFFICIENCY CONDENSING MODELS

FEATURES

CONDENSING TECHNOLOGY PROVIDES SIGNIFICANT ENERGY COST SAVINGS

SECONDARY HEAT EXCHANGER IS MADE OF TYPE 316L STAINLESS STEEL

■ Provides additional protection against corrosion

DURABLE COPPER PRIMARY HEAT EXCHANGER

CONTINUOUS MAXIMUM FLOW RATES UP TO 8.0 GPM

ENERGY STAR

OUTDOOR MODELS INCLUDE REMOTE CONTROL AS A STANDARD FEATURE

QUALIFIED

INDOOR MODELS INCLUDE BOTH A REMOTE CONTROL AND POWER CORD AS STANDARD FEATURES

ELECTRONIC IGNITION - NO PILOT LIGHT

BUILT-IN DISPLAY SHOWS OPERATING TEMPERATURE ALONG WITH DIAGNOSTIC AND ERROR CODES

LOW NOx EMISSIONS

COMPLIES WITH LEAD PLUMBING LAW

SAFETY FEATURES:

■ Air-Fuel Ratio (AFR) Sensor

■ Exhaust & Water Temperature Safety Control

■ 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

■ Uses Inexpensive PVC, CPVC, OR ABS Pipe for Intake and Exhaust (solid core only).

Canadian Installations Require ULCS636 Listed PVC or CPVC Pipe for Venting.

■ Category III Stainless Steel venting can also be used

ACCESSORIES

■ Remote Temperature Controller

■ Pipe Cover

■ Neutralizer Kit

■ Plumbing Installation Kits

■ PVC Intake Adaptor

■ Concentric Termination

INDOOR MODELS

ATI-320H-N, ATI-320H-P

OUTDOOR MODELS

ATO-320H-N, ATO-320H-P

WARRANTY

■ 12-year limited warranty on heat exchanger in residential applications

■ 5-year warranty on all parts

Revised April 2012

ANSI Z21.10.3 CSA 4.3

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AOSRG46804

Residential Gas Tankless

Water Heaters

TANKLESS HIGH EFFICIENCY CONDENSING MODELS

MODEL

NUMBER

GAS CONSUMPTION INPUT INLET GAS PRESSURE

FUEL TYPE

MINIMUM

BTU/H

MAXIMUM

BTU/H

MINIMUM

W.C.

MAXIMUM

W.C. HEIGHT WIDTH DEPTH

ENERGY

FACTOR

MAX

GPM*

AND

GAS CONN.

HOT/COLD

DIMENSIONS IN INCHES

APPROX.

SHIPPING

WEIGHT

INDOOR

ATI-320H-N Natural 13,000 180,000 5.0 10.5 0.91 8.0 3/4” NPT 25-3/5 18-1/2 12-2/5 73

ATI-320H-P Propane 13,000 180,000 8.0 14.0 0.91 8.0 3/4” NPT 25-3/5 18-1/2 12-2/5 73

OUTDOOR

ATO-320H-N Natural 13,000 180,000 5.0 10.5 0.91 8.0 3/4” NPT 25-3/5 18-1/2 12-2/5 70

ATO-320H-P Propane 13,000 180,000 8.0 14.0 0.91 8.0 3/4” NPT 25-3/5 18-1/2 12-2/5 70

All dimension in inches. 15-150 psi Water Pressure. 40 psi or above recommended for maximum flow. *Current numbers based on factory testing; 0.4 GPM required for continuous fire after initial ignition.

6-1/4" (161.5mm)

1/2" (12.5mm)

GAS 6" (153.6mm)

HOT 7-1/4" (182.1mm)

120VAC 8-1/2" (216.3mm)

COLD 8-5/8" (220.6mm)

10-1/2" (266.8mm)

Condensate Drain Port

25-1/2" (649mm)

12-1/2" (316mm)

INDOOR MODELS

Male Ø4" (100.8mm)

6-5/8" (168.4mm)

2-3/4" (69.1mm) INTAKE

120VAC 2-1/4" (58.2mm)

HOT 5-5/8" (142.2mm)

18-1/2" (470mm)

12-1/2" (320mm)

3-1/2" (90mm)

Ø4" (102mm) Female

3/4" (18.8mm)

2-3/4" (71.8mm) EXHAUST

1-1/4" (29.2mm) COLD

4-5/8" (116.8mm) GAS

6-1/4" (159.1mm)

Condensate Drain Port

29-1/2" (751mm)

1/2" (12.5mm)

GAS 6" (153.6mm)

HOT 7-1/4" (182.1mm)

120VAC 8-1/2" (216.3mm)

COLD 8-5/8" (220.6mm)

10-1/2" (266.8mm)

Condensate drain port

25-1/2" (649mm)

OUTDOOR MODELS

12-1/2" (316mm)

4-1/2" (115mm)

120VAC 2-1/4" (58.2mm)

18-1/2" (470mm)

12-1/2" (320mm)

3-1/2" (90mm)

4-1/2" (115mm)

1-1/4" (29.2mm) COLD

4-5/8" (116.8mm) GAS

6-1/4" (159.1mm)HOT 5-5/8" (142.2mm)

Condensate drain port

(LBS)

29-1/2" (751mm)

CLEARANCES: Top: 12”; Bottom: 12”; Front: 4”; Back: .05”; Sides: 3”

Flow Rate Vs. Temperature Rise

9.0

8.0

7.0

6.0

5.0

4.0

3.0

Flow Rate (gpm)

2.0

1.0

0.0

0 20 40 60 80 100 120 140

Temperature Rise (°F)

Set Temperature : 125°F & lower Set Temperature : 130 & higher

°F

CLEARANCES: Top: 36”; Bottom: 12”; Front: 4”; Back: 0.5”; Sides: 3”

Pressure Loss

Pressure Loss (psi)

0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0

Flow Rate (gpm)

Set Temperature : 125°F & lower Set Temperature : 130 &high er

°F

Head Feet

For Technical Information call 1-877-737-2840. A. O. Smith Corporation reserves the right to make product changes or improvements without prior notice.

Revised March 2012

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