ATI-540P Installation Manual

27 Page

Determine the vent diameter (D) and the total vent length based on the number of water

height (H). See the table below.
 Total vent length (L)="H"+"W"
 Vent diameter="D"
WARNING
 A Non-Return Valve must be installed for each water heater. This prevents
the escape of combustion gas through non-operating appliances.
 For detailed instructions on the common-venting system, refer to the
instructions that are packaged with the vent parts or web site.
NOTICE
 Regarding the clearances
between the exhaust
   
   pp. 28
to 30.
 Insert bird screen in
elbow terminals.
*Diameters of pipes are in accordance with Centrotherm's specifications.
**One elbow is equivalent to 5 ft (1.5 m) linear length, and the maximum number of elbows is 5.
Common-venting system
Vent
Diameter*
(D)
Max.
No.of
water
heaters
Max. Vertical and
Horizontal
(Total) Vent Length** (L)
DIP switch settings
540P Indoor
(Lower bank of
DIP switches)
4 in
(110 mm)
2 25 ft (7.6 m)
1 2 3 4 5 6 7 8
ON
No.3 : ON
No.4: OFF
5 in
(125 mm)
2 50 ft (15.2 m)
3 20 ft (6.1 m)
6 in
(160 mm)
2 100 ft (30.5 m)
3 75 ft (22.9 m)
4 50 ft (15.2 m
5 25 ft (7.6 m)
6 20 ft (6.1 m)
8 in
(200 mm)
3 100 ft (30.5 m)
4 100 ft (30.5 m)
5 85 ft (25.9 m)
6 65 ft (19.8 m)
7 50 ft (15.2 m)
8 41 ft (12.5 m)
10 in
(250 mm)
5 100 ft (30.5 m)
6 100 ft (30.5 m)
7 100 ft (30.5 m)
8 100 ft (30.5 m)
Installaon
Installaon Manual
Intake
Exhaust
"D"
Elbow terminal
Elbow terminal
"W"
Non-Return Valve
"H"
 For common-venting,
adjust only the No.3
and No.4 DIP switches
in the LOWER bank of
DIP switches. (Refer to
p.24 for the location of
the DIP switches.)
 Turn off the power sup-
ply to the water heater
before changing the
DIP switch settings.
 Failure to observe
these warnings could
lead to carbon monox-
ide poisoning or death.
WARNING