Brochure

540H SERIES
Specifications
Complies with Ultra-Low NOx regulations. Utilizing commercial-grade copper alloy
for the heat exchanger tubing, the 540H is also suitable for heavier residential
usages such as combination space heating and domestic recirculation systems.
Indoor models have an integrated temperature controller and outdoor models
include a remote control as a standard feature. Indoor models are certied up to
10,100 ft. altitude.
Model Number* Type
Gas Consumption Input Inlet Gas Pressure**
UEF
Minimum
(BTU/H)
Maximum
(BTU/H)
Minimum
(in. W.C.)
Maximum
(in. W.C.)
ATI-540H-N Natural 15,000 199,000 4.0 10.5 0.93
ATO-540H-N Natural 15,000 199,000 4.0 10.5 0.95
*For propane models, change “N” to “P”
**For propane models, minimum fire rate is 13,000 BTU/H, minimum inlet gas pressure is 8.0 in. W.C. and maximum inlet gas pressure is 14.0 in. W.C.
CONDENSING
Model Number*
Maximum
GPM
Hot/Cold
Connections
Gas
Connection
Clearances (in.)
Approx
Shipping
Weight (lbs)
Top Bottom Side Front
ATI-540H-N 10 3/4" NPT 3/4" NPT 12 12 3 4 71
ATO-540H-N 10 3/4" NPT 3/4" NPT 36 12 3 24 69
ANSI Z21.10.3 • CSA 4.3
540H
Temperature
Settings
Built In / without remote 120°F (default) 140°F
With 100209924 remote (max. distance 400’ from heater, non-polarized 20 gauge wiring.)
100°F to 160 °F with 5°F intervals (13 options), 120°F Default Factory Setting
Electric 120 V 89 W / 0.74 A (Operation) 4 W / 0.04 A (Standby) 175 W / 1.5 A (Freeze-Protection)
ATI-540H-N ATO-540H-N
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