Installation Guide

76 Page
OUTPUT TEMPERATURE CHART
Chart is based on properly sized gas line.
540P model
*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
Output Hot Water GPM
Set Temp. °F(°C)
Incoming Temp.
Parts List
Owner's Guide
5M2051
2000536265
(REV. A)
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