ATI-540P Installation Manual
4 Page
Specicaons
Installaon Manual
SPECIFICATIONS
*40 psi or above is recommended for maximum flow.
**Water heater Category — water heaters of other than direct vent type, for outdoor installation, are divided into four
categories based on static pressure produced in the vent and flue loss.
Category I - a water heater that operates with a non-positive vent static pressure and with a vent gas temperature
that avoids excessive condensate production in the vent.
Category II - a water heater that operates with a non-positive vent static pressure and with a vent gas temperature
that may cause excessive condensate production in the vent.
Category III - a water heater that operates with a positive vent static pressure and with a vent gas temperature that
avoids excessive condensate production in the vent.
Category IV - a water heater that operates with a positive vent static pressure and with a vent gas temperature that
may cause excessive condensate production in the vent.
***These are equivalent lengths that include head loss for elbows, tees, unions, etc.
NOTE:
The manufacturer reserves the right to discontinue, or change at any time, specifications or designs
without notice and without incurring obligation.
Model
540P Indoor 540P Outdoor
Natural Gas Input (Operating Range) BTU/h
Min: 15,000
Max.: 199,000
Propane Input (Operating Range) BTU/h
Min: 13,000
Max.: 199,000
Gas Connection 3/4" NPT
Water Connections 3/4" NPT
Water Pressure* psi (MPa) 15 - 150 (0.1 - 1)
Natural gas
Inlet Pressure
" W.C. (kPa) Min 4.0 (1.00) Max. 10.5 (2.61)
Propane
Inlet Pressure
" W.C. (kPa) Min 8.0 (1.99) Max. 14.0 (3.48)
Weight lbs. (kg) 61.0 (27.7)
Dimensions
inch
H 22.4 x W 17.7 x D 10.7
H 570 x W 450 x D 272
mm
Ignition Electric Ignition
Electric
Supply VAC / Hz 120 / 60
Consumption
Operation
With pump W / A 108.6 / 1.34
Without pump W / A 87.6 / 1.10
Standby W / A 4.6 / 0.10
Freeze-Protection W / A 192.3 / 1.63
Water heater Category**
Category IV
N/A
Maximum Pipe length***
(Hot Water supply line and
Dedicated Return line)
Pipe
Diameter
3/4"
( 19 mm)
500 ft (152.4 m)
1/2"
( 13 mm)
200 ft (61.0 m)