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