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OUTPUT TEMPERATURE CHART
Chart is based on properly sized gas line.
540P model
100
(38)
105
(40)
110
(43)
115
(45)
120
(50)
125
(52)
130
(55)
135
(57)
140
(60)
40°F（4℃）
6.3 5.8 5.4 5.0 4.7 4.4 4.2 4.0 3.8
50°F（10℃）
7.6 6.9 6.3 5.8 5.4 5.0 4.7 4.4 4.2
60°F（16℃）
9.5 8.4 7.6 6.9 6.3 5.8 5.4 5.0 4.7
70°F（21℃）
10.0 10.0 9.5 8.4 7.6 6.9 6.3 5.8 5.4
0.0
2.0
4.0
6.0
8.0
10.0
12.0
Output hot water GPM
40°F（4℃） 50°F（10℃） 60°F（16℃） 70°F（21℃）
30
45
Set temp.
℉（℃）
Incoming temp.
℉（℃）
(L/M)
(23.9) (22.0) (20.4) (19.1) (17.9) (16.8) (15.9) (15.1) (14.3)
(28.6) (26.0) (23.9) (22.0) (20.4) (19.1) (17.9) (16.8) (15.9)
(35.8) (31.8) (28.6) (26.0) (23.9) (22.0) (20.4) (19.1) (17.9)
(37.9) (37.9) (35.8) (31.8) (28.6) (26.0) (23.9) (22.0) (20.4)
15
*When the set temperature is 130 °F (55 °C) or higher, maximum flow rate is limited to 8.0 GPM.
Output Temperature vs. GPM (Max. 10.0 GPM) with Various Inlet Water Temperature
Parts List
Owner's Guide
5M2051-1
2000536265
(REV. B)
Item # Description
Part #
540P
(AT-H3P)
713 Switch wire with thermostat for Indoor model
for Outdoor model
N/A
N/A
714
715
716
717
Proportional gas valve wire
24V cables for Indoor model
for Outdoor model
Computer board cover
Cable clamp
100074657
N/A
N/A
100074375
N/A
EX13C
718
719
721
722
723
Exhaust thermistor for Indoor model
Remote fixing plate
Exhaust Hi-limit switch wire
Temperature controller for Indoor model
Fixing plate
100074316
100074644
100074659
100276680
N/A
724
725
726
Temperature remote controller
Pump fixing plate
Recirculation pump assembly
100276687
N/A
100276636
TM-RE43
727
728
729
Pump inlet pipe
Pump outlet pipe
Pump connection
100276638
100276639
100276676
730
731
732
PCB fixing plate
Return thermistor
Closing plug
N/A
100276681
100276683
733
734
735
Three way connection
Heater
Fastner "12.7"
100276686
100076326
100076400
EM190
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