Brochure

62
* For outdoor models, change “ATI” to “ATO”. For propane models, change “N” to “P”
** For propane models, minimum is 13,000
*** For propane models, minimum inlet gas pressure is 8.0 in. W.C. and maximum inlet gas
pressure is 14.0 in. W.C.
† Cold climate represents 70°F temperature rise
‡ Warm climate represents 50°F temperature rise
COLD 5/8" (17 mm)
GAS 5-3/4" (147 mm)
Condensate drain port
120 VAC 3" (77 mm)
Drain port 4-7/8" (124 mm)
HOT 6-3/4" (171 mm)
RETURN 3-1/8" (79 mm)
7-1/2" (189 mm)
COLD 5/8" (17 mm)
7-1/2" (189 mm)
17-3/4" (450 mm)
6-1/4" (159 mm)
7" (180 mm)
Φ 4" (102 mm)
15" (381 mm)
Φ 4" (102 mm)
FemaleFemale
23-5/8" (600 mm)
24-7/8" (631 mm)
RETURN 4-5/8" (117 mm) GAS 5-1/8" (131 mm) HOT 6-1/2" (164 mm) COLD 6-3/4" (172 mm) Condensate drain port Drain port 6-1/4" (159 mm) 120 VAC 3-7/8" (174 mm) 7-7/8" (199 mm)
11-1/4" (285 mm)
5-3/4" (147 mm)
Exhaust 2-5/8" (65 mm)
Intake 2-5/8" (68 mm)
RETURN 4-5/8" (117 mm)
GAS 5-1/8" (131 mm)
HOT 6-1/2" (164 mm)
COLD 6-3/4" (172 mm)
Condensate drain port
1/2 (13 mm)
Drain port 6-1/4" (159 mm)
120 VAC 3-7/8" (174 mm)
7-7/8" (199 mm)
120 VAC 3" (77 mm)
GAS 5-3/4" (147 mm)
Condensate drain port
Drain port 4-7/8" (124 mm)
HOT 6-3/4" (171 mm)
RETURN 3-1/8" (79 mm)
5-3/4" (147 mm)
6-1/4" (159 mm)
17-5/8" (448 mm)
540P Indoor (AT-H3P-DV)
540P Outdoor (AT-H3P-OS)
COLD 5/8" (17 mm)
GAS 5-3/4" (147 mm)
Condensate drain port
120 VAC 2-7/8" (72 mm)
Drain port 4-7/8" (124 mm)
HOT 6-3/4" (171 mm)
RETURN 3-1/8" (79 mm)
7-1/2" (189 mm)
COLD 5/8" (17 mm)
7-1/2" (189 mm)
17-3/4" (450 mm)
7" (180 mm)
15" (381 mm)
23-5/8" (600 mm)
24-7/8" (631 mm)
RETURN 4-5/8" (117 mm) GAS 5-1/8" (131 mm) HOT 6-1/2" (164 mm) COLD 6-3/4" (172 mm)
Condensate drain port
Drain port 6-1/4" (159 mm) 120 VAC 2-3/4" (71 mm) 7-7/8" (199 mm)
11-1/4" (285 mm)
RETURN 4-5/8" (117 mm)
GAS 5-1/8" (131 mm)
HOT 6-1/2" (164 mm)
COLD 6-3/4" (172 mm)
Condensate drain port
1/2 (13 mm)
Drain port 6-1/4" (159 mm)
120 VAC 2-3/4" (71 mm)
7-7/8" (199 mm)
120 VAC 2-7/8" (72 mm)
GAS 5-3/4" (147 mm)
Condensate drain port
Drain port 4-7/8" (124 mm)
HOT 6-3/4" (171 mm)
RETURN 3-1/8" (79 mm)
17-5/8" (448 mm)
INDOOR MODEL
OUTDOOR MODEL
Model
Number*
Type
Gas Consumption Input Inlet Gas Pressure***
Minimum**
(BTU/H)
Maximum
(BTU/H)
Minimum
(in. W.C.)
Maximum
(in. W.C.)
ATI-540P-N
Natural 15,000 199,000 4.0 10.5
Model
Number*
Energy
Factor
(EF)
Connections
Sizing Chart
(Number of Showers)
Water Gas
Cold
Climate†
Warm
Climate‡
ATI-540P-N
0.95 3/4” NPT 3/4” NPT 3 4.5
Model
Number*
Clearances (inches) Approx
Shipping
Weight (lbs)
Top Bottom Side Front
ATI-540P-N
12 12 3 4 61