Table of Contents
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Item #
Description
116
Pressure port
117
Combustion chamber tube
118
Gas inlet
119
Gas inlet ring
121
Surge box plate
150
O-ring P18 NBR (Black)
151
O-ring P20 NBR (Black)
152
Silicon ring for Outdoor models
153
Exhaust port for Outdoor models
401
Primary heat exchanger assembly
402
Flow adjustment valve / Flow sensor
403
Bypass valve (540HX3)
404
Water inlet
405
Inlet drain plug
406
Inlet water filter
407
Inlet thermistor
408
Outlet thermistor
409
Water outlet
410
Outlet drain plug
411
Heat exchanger thermistor (540HX3)
412
Hi-Limit switch
413
Overheat-cut-off fuse
414
Pipe heater
415
Inlet heater for Indoor model
415
Inlet heater for Outdoor model
416
Drain plug detector assembly
417
Inlet heater
418
Secondary heat exchanger for Indoor model
Secondary heat exchanger for Outdoor model
419
3ʺ PVC adapter
420
Inlet pipe heater
421
Upper drain tube
422
Band A
423
Lower drain tube
450
Pipe heater fixing plate
451
Heater fixing plate 16
452
Fuse fixing plate 18
453
Fuse fixing plate 14
454
O-ring P4 FKM
455
O-ring P6 FKM
456
O-ring P14 FKM
457
O-ring P15 FKM
458
O-ring P16 FKM
459
Fastener "4-11"
460
Fastener "14-22"
461
Fastener "16A"
462
Fastener "16-25A"
463
Fastener "6-15"
464
Flat heater
465
Drain pipe
466
Cold pipe
467
Stainless heat exchanger out pipe
468
Header connection
469
Drain port
470
Thermistor fixing plate
471
Exhaust thermistor gasket
472
Hi-limit switch for exhaust
473
Gasket
240HX3
100342435
N/A
100074398
100074680
N/A
100074412
100342438
61
Page
Owner's Guide
Parts list
Model
340HX3
540HX3
100074227
100074528
100074616
100074526
N/A
100074533
100074242
100074678
100074679
100276637
100074624
100074625
100074377
100074381
100074382
100074626
100074374
100074681
100074383
100074281
100074280
100074334
100074682
100074683
100074684
100342423
100074629
100074700
100074701
100310706
100076328
N/A
N/A
N/A
100074273
100074310
100074251
100074331
100076303
100076305
100076306
100076307
100076308
100074282
100074290
100074410
100074389
100074297
100074686
100342436
100342437
100074690
100074691
100074692
100074291
100074296
100074289
100074693
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