Specifications - A.O. Smith Water Heater 520 Direct Vent Indoor Service Manual

1. Specifications of the 520 Direct Vent Indoor* and Outdoor
Model
Dimensions
Weight
Max
INPUT
BTU/h
Min
Combustion System
Installation
Fan motor
Max
Manifold
Pressure**
Min
Flow rate
Available set
temperatures
Temperature on
the unit settings
Bypass valve
Thermistors
Remote controller
model
PCB model
Indicators
Power supply
control
Freeze protection
Self-combustion
improvement
Easy-Link system
Multiple-system
* The 520 Direct Vent Indoor means the 520 Indoor in the text.
**The manifold pressure measurement is based on conditions without front cover.
520 Direct Vent Indoor
H25.6"×W18.5"×D12.4"
73 lbs.
Direct-vent
LP 4.9" WC
Natural 3.6" WC
LP 1.0" WC
Natural 0.7" WC
100°F, 105°F, 110°F, 115°F, 120°F, 125°F, 135°F, 140°F,
145°F, 150°F, 155°F, 160°F, 165°F, 170°F, 175°F, 185°F
4 thermistors
(In, Out, Mixing, Exhaust)
Red LED on PCB during operation & 3-digit 7-SEG LED
Surge absorber & Power ON-OFF switch
Ceramic heaters and Auto-firing system
Air-Fuel Ratio Detection System
3
520 Indoor / 520 Outdoor Service Manual
199,000
13,000
Power vent
PWM turbo fan
0.5 GPM to 9.0 GPM
100°F to 185°F
default: 120°F
Yes
9007603005
520
Yes (Up to 4 units)
N/A
CONFIDENTIAL
Ver. 1.00
520 Outdoor
71 lbs.
Outdoor
LP 4.6" WC
Natural 2.8" WC
LP 0.9" WC
Natural 0.6" WC
3 thermistors
(In, Out, Mixing)