Installation and Operation Instructions
Document 2192A
Installation and Operation
Instructions for
LT Series
Wall-Mounted, Modulating
Gas Condensing Water Heater with
Recirculation pump
Model LT199NRX1 / LT199PRX1
(199,000 BTU/hr)
• Natural Gas (NG) - Factory Configuration
• Propane (LP) - Factory Configuration
FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician,
qualified in water heater installation and maintenance. Improper installation and/or operation could create
carbon monoxide gas in flue gases which could cause serious injury, property damage, or death. Improper
installation and/or operation will void the warranty.
WARNING
If the information in this manual is not
followed exactly, a fire or explosion may
result causing property damage, personal
injury or loss of life.
Do not store or use gasoline or other
flammable vapors and liquids in the vicinity of
this or any other appliance.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not
use any phone in your building.
• Immediately call your gas supplier from a
nearby phone. Follow the gas supplier's
instructions.
• If you cannot reach your gas supplier, call
the fire department.
Installation and service must be performed
by a qualified installer, service agency, or gas
supplier.
AVERTISSEMENT
Assurez-vous de bien suivres les instructions
données dans cette notice pour réduire au
minimum le risque d’incendie ou d’explosion
ou pour éviter tout dommage matériel, toute
blessure ou la mort.
Ne pas entreposer ni utiliser d’essence ou ni
d’autres vapeurs ou liquides inflammables dans
le à proximité de cet appareil ou de tout autre
appareil.
QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE
GAZ:
• Ne pas tenter d’allumer d’appareils.
• Ne touchez à aucun interrupteur. Ne pas vous servir
des téléphones dans le bâtiment où vous vous
trovez.
• Appelez immédiatement votre fournisseur de
gaz depuis un voisin. Suivez les instructions
du fournisseur.
• Si vous ne pouvez rejoindre le fournisseur de
gaz, appelez le sservice des incendies.
L’installation et l’entretien doivent être assurés par
un installateur ou un service d’entretien qualifié
ou par le fournisseur de gaz.
Page 87
SECTION 10 Part List
10.1 Case Parts
IOM Ref
Part Number
Description
1
ST1224
Exhaust Vent Duct ASSY'
1-1
ST1225
Exhaust Vent Cap Assy
1-2
ST1190
Exhaust and Intake Packing
O-75
ST1244
O ring P75 10 pcs
O-7
ST1242
O ring P7 10 pcs
2
ST1226
Intake Inlet Duct ASSY'
3
ST1227
Air Intake filter Assy
4
ST1006
Ignition Transformer
5
ST1144
Air Pressure Switch
6
ST1143
On-Demand Terminal Block
7
ST1019
Main Power Switch
8
ST1093
Bracket for control display
9
ST1141
Control display of RTGR & LT Premium (PR-952C)
10
ST1099
Front Cover ASSY'
11
ST1139
Printed Circuit Board
12
ST1163
PCB Bracket
13
ST1189
Wiring Through Way Packing
14
ST1146
Water Leak Detector
15
ST1100
DHW Supply Pipe ASSY'
15-1
ST1228
DHW Temperature Sensor Assy
O-10
ST1192
O-ring(P10A)
16
ST1101
Siphon ASSY'
17
ST1102
Recirculation Return Unit ASSY'
17-1
ST1024
Recirculation Return Filter
18
ST1007
Gas Inlet Nipple
19
ST1103
Check valve Return Connection ASSY'
20
ST1104
Water Inlet Pipe ASSY'
20-1
ST1229
Cold Water Temperature Sensor Assy
21
ST1105
Flow Control Valve ASSY'
C-2
ST1054
Star CLIP (Small)
O-16
ST1194
O-ring(P16)
O-20
ST1196
O-ring(P20)
Page 88
1
15-1
15 15-1
1-2
1
O-7
2
O-10
16
1-1
3
17
O-16
O-75
1-1
2
O-20
1-2
17-1
3
19
4
5
8
20
6
O-16
C-2
20-1
9
15
7
10
17-1
17
14
12
18
13
11
19
21
21
C-2
20
16
20-1
Page 89
10.2 Fitting Parts
IOM Ref
Part Number
Description
22
ST1106
Hot water Outlet Block ASSY'
22-1
ST1230
Hot Water Temperature Sensor Assy
22-2
ST1218
Block Packing
23
ST1107
Hot Water Outlet Pipe 1 ASSY'(Premium)
23-1
ST1231
Overheat Switch 95℃ Assy
23-2
ST1167
Overheat Switch Bracket
24
ST1108
Water Chamber Block ASSY'
25
ST1109
Pump Block ASSY'
26
ST1110
Circulation Pump ASSY'
26-1
ST1246
25A Packing 10 pcs
27
ST1111
Hot Water Outlet Pipe 2 ASSY'(Premium)
28
ST1112
Mixing Block ASSY'
29
ST1113
Pump Outlet Pipe ASSY'
30
ST1124
Mixing Pipe ASSY'(Premium)
31
ST1232
Water Mixing Valve Assy
32
ST1114
Recirculation Block ASSY'
33
ST1233
Recirculation Flow Sensor Assy
34
ST1115
Cold Water Inlet Pipe ASSY'(Premium)
35
ST1116
Recirculation Pipe ASSY'
36
ST1117
Cold Water Inlet Block ASSY'(Premium)
37
ST1094
Water Chamber ASSY'
C-1
ST1166
Star CLIP (Large)
C-2
ST1054
Star CLIP (Small)
O-15
ST1193
O-ring(P15)
O-16
ST1194
O-ring(P16)
O-18
ST1195
O-ring(P18)
Page 90
26
22
23
27
28
26-1
37
24
O-18
O-18
C-1
C-1
O-15
C-2
26-1
25
27
29
25
C-1
26
28
C-1
O-18
O-18
31
26-1
29
34
32
30
36
35
33
35
C-2
O-15
23 O-18
22-1
C-1
23-1
O-16
24
C-2
23-1
22-1
O-16
C-2
36
22
C-2
23-2
22-2
C-1
O-16
O-18
C-1
30
31
C-2
32
33
34
O-15
O-16
C-1
C-2
O-18
O-16
C-2
C-1
Page 91
10.3 Fan & Heat Exchanger Parts
IOM Ref
Part Number
Description
38
ST1118
Heat Exchanger ASSY'(Premium)
39
ST1134
Exhaust Pipe Upper
39-1
ST1031
Exhaust Temperature Sensor
40
ST1248
Exhaust Packing 5 pcs
41
ST1119
Burner ASSY'
41-1
ST1204
Ignition Rod ASS'Y
41-2
ST1234
Burner High Limit Switch ASSY'
41-3
ST1199
Burner Gasket
42
ST1191
Burner Head Packing
43
ST1136
Burner Head Bracket
44
ST1120
Blower ASSY'
45
ST1147
MIXER ASSY' KIT_NG
45
ST1148
MIXER ASSY' KIT_LP
46
ST1205
AGM (Cover) ASSY'
47
ST1255
AGM (Actuator)
48
ST1235
Silencer Elbow ASSY'
49
ST1236
Silencer Body ASSY'
50
ST1121
Gas Pipe (upper) ASSY'
50-1
ST1188
Gas Mixer Packing
50-2
ST1247
15A Packing(Green) 10 pcs
51
ST1122
Gas Valve ASSY'
52
ST1123
Gas Pipe (lower) ASSY'(Premium)
52-1
FT1645
15A Packing
53
ST1198
Ignition Rod Gasket
54
ST1095
Flame Observation ASSY'
55
ST1096
Flame Detector Sensor ASSY'
56
ST1165
Flame Detector Sensor Cover
57
ST1187
Flame Detector Sensor Bracket
58
FT1327
Flame Detector Sensor
59
ST1137
Burner Bracket (Left)
60
ST1138
Burner Bracket (Right)
61
ST1254
HEX Connection Pipe ASSY'
C-2
ST1054
Star CLIP (Small)
O-18
ST1195
O-RING(P18)
O-22
ST1245
O ring P22 10 pcs
Page 92
49
45
48
41
44
41-1
41-2
43
46
42
47
59
39-1
41-3
60
53
41
39
50
39-1
44
61
61
40
51
54
41-2
52
58
57
50
56
38
O-22
54
52
50-1
55
47
45
52-1
50-2
50-1
51
55
O-18
C-2
46
48
O-18
C-1
O-18
49
22-2
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