A
4 0 1
4 0 2
4 0 3
4 0 4
4 0 7
4 0 8
4 0 9
4 1 0
4 1 1
4 1 2
4 1 3
4 1 4
4 1 5
4 1 6
4 1 7
4 1 8
4 1 9
4 2 0
4 1 4
4 2 1
4 2 2
4 2 3
4 2 4
4 2 5
4 2 8
4 1 4
4 2 9
4 1 4
4 3 6
4 3 0
4 3 2
4 3 3
4 1 9
4 3 4
4 3 5
4 3 8
4 4 0
4 4 1
4 4 2
7 0 6
4 4 5
0 5 2
4 1 9
4 1 4
4 2 0
4 4 3
4 3 7
4 0 5
4 4 6
B
B
4 4 8
1 5 2
0 5 2
4 2 7
4 2 7
4 2 0
4 5 2
A
C
4 1 4
4 2 0
4 0 6
4 5 0
4 1 7
4 2 6
4 5 0
4 1 7
4 5 5
4 5 2
4 5 5
1 5 0
4 3 7
4 4 3
4 3 1
C
4 5 1
1 5 0
4 3 7
4 4 3
1 5 2
4 5 3
1 5 2
1 2 7
1 2 6
4 0 5
4 5 4
4 5 4
4 5 4
4 4 9
4 4 4
4 4 7
0 1 0
4 5 7
4 5 8
4 6 3
4 6 2
4 6 2
4 6 2
E.
Components
Diagram
/
Parts
List
Case
assembly
Computer
board
assembly
Water
way
assembly
Burner
assembly
520H
Direct
Vent
Indoor
and
320H
Direct
Vent
Indoor
0 0 1
0 0 7
0 5 4
0 0 6
7 0 3
0 5 2
0 0 4
0 0 3
0 5 2
7 0 2
1 5 2
0 0 5
0 0 2
0 5 1
0 0 8
0 0 9
0 0 4
1 5 2
0 5 2
0 1 1
0 1 2
0 1 3
0 1 4
0 1 0
0 5 2
1 5 2
1 5 2
1 2 4
1 5 2
7 0 4
1 5 6
1 0 1
1 0 2
1 0 3
1 0 4
1 0 5
1 0 6
1 0 7
1 0 8
1 0 9 11 0
1 1 1
1 1 2
1 1 4
1 1 6
1 1 7
1 1 8
1 1 9
1 2 0
1 2 1
1 2 2
1 2 3
1 5 1
1 5 2
1 5 2
1 5 2
1 5 2
7 1 0
1 5 2
1 5 2
1 5 5
1 5 5
0 5 4
1 5 3
1 2 8
0 5 3
7 0 5
1 5 2
1 1 3
7 1 2
7 1 0
7 0 8
1 5 4
1 2 5
Item#
Part#
Description
101
102
103
104
105
106
EKH5W
EKK2X
EKK0G
EKK2V
EKK2W
EKK0E
Burner
assembly
Burner
gasket
Burner
holder
gasket
Burner
window
Rod
holder
gasket
Flame
rod
107
108
109
110
111
EKK32
EKK0F
EKN61
EKK2M
EKH5G
Rod
holder
Igniter
rod
Rod
cap
High
voltage
ignite
cable
Damper
112
113
114
116
117
EKK2N
EKK2D
EKK25
EKK2Y
EKK2K
Combustion
chamber
tube
Pressure
port
Fan
motor
Manifold
gasket
A
Manifold
gasket
B
Item#
Part#
Description
401
402
403
404
405
EKH5P
EKN50
EKK26
EX02A
EX002
Heat
exchanger assembly for
520H
Indoor
and
320H
Indoor
Silicon
ring
Fuse
fixing
plate
18
Overheat
‐
cut
‐
off
fuse
Heater
101
406
407
408
409
410
EKH40
EM222
EZM25
EX006
EZN21
Drain
port
Filter
plug
O
‐
ring
P25
FKM
Water
inlet
filter
O
‐
ring
JASO#
1021
FKM
411
412
413
414
415
EM404
EZN16
EX021
EX01H
EKK2P
Water
inlet
O
‐
ring
JASO#
1016
FKM
Heater
plate
Fastener
“16AG”
Outlet
heater
416
417
418
419
420
EK239
EZM06
EX00H
EZM04
EZM16
Outlet
drain
plug
O
‐
ring
P6
FKM
Mixing
thermistor
O
‐
ring
P4
FKM
O
‐
ring
P16
FKM
421
422
423
424
425
EKH74
EKK38
EKH32
EW00A
EKK27
Cold
pipe
Inlet
thermistor
Water
control
valve
Screw
M3x6
Pipe
heater
fixing
plate
426
427
428
429
430
EKJ47
EW00L
EZM15
EKH33
EKH75
Pipe
heater
120
Pan
screw
M4x6
(W/Washer)
O
‐
ring
P15
FKM
Flow
sensor
Hot
pipe
431
432
433
434
435
EX137
EKN34
EKK2T
EKH30
EKJ02
Joint
elbow
Hi
‐
limit
switch
Output
thermistor
Fastener
“4
‐
11”
Water
outlet
436
437
438
440
441
EZN17
EZM14
EKH6H
EKH4H
EKH4J
O
‐
ring
JASO#
1017
FKM
O
‐
ring
P14
FKM
Drain
tube
Secondary
heat
exchanger
plate
gasket
A
Secondary
heat
exchanger
plate
gasket
B
442
443
444
445
446
EKH6G
EKK24
EX13H
EKH5N
EKH6X
Hi
‐
limit
switch
for
exhaust
Fastener
“14
‐
22”
Thermistor
fixing
plate
Secondary
heat
exchanger
plate
Secondary
heat
exchanger
447
448
449
450
451
EKH66
EKH78
EX13L
EX12K
EKH1Y
Drain
pipe
Secondary
heat
exchanger
out
plate
Exhaust
thermistor
gasket
Fastener
“6
‐
15”
Band
B
452
453
454
455
457
EX13B
EX13P
EX13R
EZM12
EZF03
Header
Flat
heater
3
array
heater
O
‐
ring
P12
FKM
O
‐
ring
P3
EPDM
458
462
463
EX13A
EKH38
EK031
Secondary
heat
exchanger
drain
plug
Heater
fixing
plate
20
Heater
fixing
plate
16
701
702
703
704
705
EKH4E
EKH7W
EM296
EKJ66
EKH79
EKH6V
Computer
board for
520H
models
Computer
board
for
320H
models
Transformer
Junction
box
inner
plate
Freeze
protection
and
EH
‐
IG
wire
for
520H
Indoor
and
320H
Indoor
Gas
valve
wire
Item#
Part#
Description
706
707
708
709
710
EKH6E
EKH6J
EKK12
EKH6F
EKH69
Exhaust
thermistor
assembly
Thermistors
wire
Proportional
gas
valve
wire
Multi
‐
cable
(Only
520H
models)
Flame
rod
wire
711
712
713
714
715
EKH6D
EKH71
EKK3C
EKH6C
EKH67
Switch
wire
PCB
fixing
plate
AC120V
wire
AC120V
Transformer
connecting
wire
Surge
box
716
717
718
720
721
EKK4V
EKH68
EC00X
EKH6A
EKH6B
AC120V
power
ON
‐
OFF
switch
PCB
cover
Nylon
clamp
Exhaust
fan
motor
wire
Exhaust
thermistor
wire
520H Direct
Vent
Indoor
and
320H Direct
Vent
Indoor
Item#
Part#
Description
001
002
003
004
005
EKH5B
EKH5M
EV00K
EM335
EKH5D
Case
assembly for
520H
Indoor
and
320H
Indoor
Front
cover
for
520H
Indoor
and
320H
Indoor
Intake
air
port
assembly
Bracket
Back
guard
panel
006
007
008
009
010
EKJ64
EX13M
EM484
EKK22
EKH23
Junction
box
Rubber
bush
O.H.C.F
for
combustion
chamber
Fastener
Condensate
drain
port
011
012
013
014
EKH5K
EKH4G
EKH4K
EKH73
Duct
Duct
gasket
A
Duct
gasket
B
Duct
cover
plate
051
052
053
054
055
EW000
EW002
EX010
EW02B
EW023
Screw
M4x12
(W/Washer)
Screw
M4x10
(Coated)
Pan
screw
M4x10
Screw
M4x10
Pan
screw
M3x10
Item#
Part#
Description
118
EKH6T
EKH6U
Manifold
assembly
with
gas
valve
assembly
LP
Manifold
assembly
with
gas
valve
assembly
NA
119
120
121
122
123
EM167
EKK2Z
EKK1E
EKK1B
EKN74
Wire
clamp
60
Gas
inlet
ring
Gas
inlet
Igniter
plate
Igniter
124
125
126
127
128
EKH5T
EX12X
EX12Y
EX12Z
EK042
Fan
motor
for
exhaust
HX
protection
plate
(Front)
HX
protection
plate
(Right)
HX
protection
plate
(Left)
O
‐
ring
P20
NBR
150
151
152
153
154
EW012
EW00D
EW003
EW00H
EW006
Screw
M4x8
Pan
screw
M4x8
Screw
M4x10
Screw
M4x12
(W/Washer)
Pan
screw
M4x10
155
156
EW005
EKH4V
Hex
head
screw
M4x8
Flange
gasket
for
fan
motor
7 0 9
4 2 3
7 1 0
7 2 0
1 1 4
7 1 1
7 0 4
7 0 5
7 2 1
7 0 7
7 0 8
7 0 1
7 1 2
1 5 2
7 1 3
7 1 4
7 1 5
7 1 6
0 5 5
7 1 7
0 5 3
0 5 3
0 5 5
0 5 3
7 1 3
7 1 1
7 1 5
0 0 1
7 1 9
