75 Page
Parts List
Owner's Guide
Item # Description
Part #
540P
(AT-H3P)
401 Primary heat exchanger assembly for 540P model 100276637
402
403
404
405
406
Flow adjustment valve / Flow sensor
Bypass valve
Water inlet
Inlet drain plug
Inlet water filter
100074624
100074625
100074377
100074381
100074382
407 Inlet thermistor 100276682
408 Outlet thermistor 100074374
409
410
411
Water outlet
Outlet drain plug
Heat exchanger thermistor
100074681
100074383
100074281
412 Hi-Limit switch 100074280
413
414
Overheat-cut-off fuse
Pipe heater
100074334
100074682
415 Inlet heater for Indoor model
Inlet heater for Outdoor model
100074683
100074684
416
417
Drain tube
Inlet heater
100074685
100074629
418 Secondary heat exchanger for Indoor model
Secondary heat exchanger for Outdoor model
100074700
100074701
450
451
452
453
Pipe heater fixing plate
Heater fixing plate 16
Fuse fixing plate 18
Fuse fixing plate 14
100074273
100074310
100074251
100074331
454
455
456
457
100076303
100076305
100076306
100076307
EZM04
EZM06
EZM14
EZM15
458
459
460
461
Fastener “4-11”
Fastener “14-22”
Fastener “16A”
100076308
100074282
100074290
100074410
EZM16
EM192
462
463
464
465
Fastener “16-25A”
Fastener “6-15”
Flat heater
Drain tube
100074389
100074297
100074686
100276674
466 Cold pipe 100276640
467
468
469
470
Stainless heat exchanger out pipe
Header connection
Drain port
Thermistor fixing plate
100074690
100074691
100074692
100074291
EX13H
471
472
473
Exhaust thermistor gasket
Hi-limit switch for exhaust
Gasket
100074296
100074289
100074693
EX13L
701 Computer board 100276677
702
703
704
Rubber grommet
Surge box
120 VAC wire for Indoor model
100076470
100076100
100074601
EX00B
706
707
708
120 VAC Power ON-OFF switch
Remote controller wire
Gas valve wire
100074326
100074650
N/A
709
711
Flame rod wire
Igniter assembly
N/A
100276678
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