HTP Hydra Smart RT-199 User manual

LP-532 REV. 8.13.2014 LP-532 REV. 8.13.2014
Service Manual
HYDRA SMART RESIDENTIAL WATER HEATER
Hydra Smart Residential Water Heater
Service Manual
RT-199 (Residential Water Heater)
• Natural Gas(NG)– Factory Default
• Liquid Propane Gas (LP)– Contact Factory
Model
Hydra Smart Residential Water HeaterService Manual
WARNING
– Donotstoreorusegasolineorother󰘱ammable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neighbor’sphone.Followthegassupplier’sinstructions.
· Ifyoucannotreachyourgassupplier,callthe󰘰redepartment.
– Installationandservicemustbeperformedbyaquali󰘰edinstaller,serviceagencyorthegassupplier.
Iftheinformationintheseinstructionsisnotfollowedexactly,a󰘰reorexplosionmayresult,
causingpropertydamage,personalinjury,ordeath.
120 Braley Road, East Freetown, MA 02717 •1-800-323-9651 •www.htproducts.com
SCAQMD Rule 1146.2
SCAQMD Rule 1146.2
Advanced Heating
& Hot Water Systems

12
LP-532 REV. 8.13.2014 LP-532 REV. 8.13.2014
Chapter 1 Product Characteristics Speci󰘰cations 6
Dimensions 7
Components description 8
Flow chart 9
Time chart 10
Operation󰘱owchart 11
Wiring diagram 13
Chapter 2 Components description Maincontrolboard 17
Temperature sensors 18
Burner overheat switch 19
Freeze Protection Heater 20
Gas leak detector sensor 21
Jumper wire connection 22
Air Pressure switch 23
Mixing valve (DHM) 24
Flow control valve (IWM) 25
Inletwater󰘰lter 26
Ignition Transformer 27
Flame Detection Sensor 28
Air Gas mixer (AGM) 29
Gas valve 30
BLDC motor 31
MetalFiberPremixBurner 32
Heat exchanger 33
Condensate trap 34
Chapter 3 How to use control panel Function explanation 35
Control panel 36
ControllerLCDSpeci󰘰cation 36
Control Panel Mode 36
Domestic hot water temperature control 38
Domestic hot water high temperature control 38
Water flow rate 39
Fan speed 39
Lock mode 40
Operating temperature (Heat Exchanger) 40
DHW Outlet Water Temperature 41
Exhaust Gas Temperature. 41
DHW Inlet Water Temperature. 42
Supply Power Time (X 10 hours) 42
View Burner Operating Time (unit: 1 Hour) 43
View Burner Operating Time (unit: X1000 Hr) 43
View Ignition Cycles (cycles X 10 times) 44
View Ignition Cycles (cycles X 10,000 times) 44
Fault Code History 45
Clear Error Code History 45
System Reset 46
Change DHW flow rate measurement unit 46
Fan, Max RPM Adjustment 47
Fan, Min RPM Adjustment 47
Cascade Mode Setting 48
Common Vent Mode Setting 48
Cascade Master/Slave Setting 49
Number of Cascade water heater 49
Reset Burner Operating Time 50
Reset Ignition Cycles 50
AGM value correction 51
Flame Detection 52
Gas Detection 52
Sensing Air Signal 53
‘I/T’, ‘DHW’, ‘OP’ sensors 53

34
LP-532 REV. 8.13.2014 LP-532 REV. 8.13.2014
Chapter 4 Troubleshooting Error code. 54
Er 10 56
Er 11 57
Er 16 58
Er 20 59
Er 29 60
Er 31 61
Er 32 62
Er 33 63
Er 35 64
Er 38 65
Er 39 66
Er 40 67
Er 41 68
Er 42 69
Er 43 70
Er 65 71
Er 66 72
Er 67 73
Er 72 74
Er 73 75
Er 94 76
Chapter 5 Replacement instructions Main Controller 77
Ignition Transformer 78
Flame Detection Sensor 79
Gas leak detector 79
Air Pressure Switch 80
Gas valve 81
Condensate trap 82
Flow control sensor 83
Cold water inlet filter assembly 84
Cold water inlet filter 85
Mixing valve 85
Air gas mixer(AGM) 86
BLDC Fan assembly 87
Chapter 6 Maintenance Cleaning Air Intake Filter 88
Cleaning Cold Water Inlet Water 88
Flushing Water Heater Pipe 89
Chapter 7 Components diagram Cabinet Parts 90
Heat exchanger parts 91
Memo 92

56
LP-532 REV. 8.13.2014 LP-532 REV. 8.13.2014
Model Name RT-199
Gas Input Rate MAX 199,000 Btu/h
MIN 19,900 Btu/h
Hot Water Capacity
35°F Rise 11.0Gal
45°F Rise 8.5Gal
77°F Rise 5.0Gal
Installation Indoor, Wall Hung, Fully Condensing
Flue System SealedCombustionDirectVent
VentRun 2”(15ft),3″(100ft)Schedule40PVC,CPVC,PP
Ori󰘰ceSize NG(Ori󰘰ce/Needle) 9.5mm(0.374˝)/9.5mm(0.374˝)
LP(Ori󰘰ce/Needle) Consult the factory
Gas Supply Pressure NG 3.5˝WCto14˝WC
LP 3.5˝WCto14˝WC
Manifold Pressure Min(3″) NG:-0.01”WC,LP:-0.11”WC
Max(3″) NG:-0.03”WC,LP:-0.09”WC
Power Supply
Main Supply 120V60Hz
Maximum
Power Consumption 135W
Ignition System Direct Electronic Ignition / Automatic Flame Sensing
Burner System SingleOri󰘰cePremixedFuelModulationMetalFiber
Infrared
GasValveSystem Air ratio valve
Minimum Flow Rate 0.5GPM
Internal Pipe Material Stainless Steel
Dimensions W17.3″–H27.6″–D14.8″
Weight 88lbs
SubHeatExchangerWaterCapacity(DHW) Under 2 Gallon
Control Panel / Main Controller P-920C / GTH-9500C
Water Pressure Min 15 - Max 150 PSI
Connection Sizes
Cold Water Inlet /
Hot Water Outlet 3/4″NPT
Gas Inlet 3/4″NPT
Materials
Casing ColdRolledCarbonSteel
Heat Exchanger Primary Heat Exchanger : Stainless Steel
Secondary Heat Exchanger : Stainless Steel
Safety Devices
FlameRod,BurnerOverheatCutO󰘯Device(302F/150C),
Gas Leak Detector, Exhaust High Limit Switch
(149F/65C), Freeze Protection Ceramic Heater (turns on
at41F/5C,turnso󰘯at59F/15C),Watertemperaturelimit
switch(199F/93C).
Chapter 1 Product Characteristics

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LP-532 REV. 8.13.2014 LP-532 REV. 8.13.2014
Description Diameter
A Exhaust Outlet Pipe collar 3˝
B Air intake collar 3˝
C Gas Inlet Adapter 3/4˝
D DHW Outlet Adapter 3/4˝
E DHW Inlet Adapter 3/4˝
F Condensate drain 1/2˝
GDHWInlet󰘰lter N/A
NO Name of Component
1
ExhaustVentAdapter
2
Air Intake Adapter
3
AGM(Air Gas Mixer)
4
Ignition Transformer
5
Igniter
6
Flame Detection Sensor
7
PrimaryHeatingExchangerAssembly
8
Hot Water Outlet Pipe
9
MixingValve
10
Air Pressure Switch
11
N/A
12
Manual Power Switch
13
WaterAdjustmentValve
14
Main Controller
15
SecondaryHeatExchangerAssembly
16
Gas Inlet Pipe 1
17
Flame sight glass
18
Burner Case
NO Name of Component
19
Exhaust Duct
20
GasValve
21
Gas Inlet Pipe 2
22
BLDC Fan
23
Air Intake Pipe Adapter
24
Gas Inlet Adapter
25
Freeze Protector
26
DHW Outlet Adapter
27
Condensate Trap
28
Cold Water Inlet Adapter
29
Cold Water Inlet Filter
30
Control Panel
31
OP NTC
32
H/L Overheat Switch
33
Ceramic Heater
34
DHW NTC
35
Condensate Trap Hose
36
Burner Overheat Switch
Chapter 1 Product Characteristics Chapter 1 Product Characteristics

910
LP-532 REV. 8.13.2014 LP-532 REV. 8.13.2014
FAN
FAN
FAN
3s 1.5s2s
180s
3s 1.5s2s 10s 1.5s2s
■If normal ignition
Time chartFlow chart
■If Flame Extinguishes
■ Ifabnormalignition(Alarmafterthe10trial)
IGNITION
IGNITION
IGNITION
GASVALVE
GASVALVE
GASVALVE
FLAME DETECTION
FLAME DETECTION
FLAME DETECTION
Chapter 1 Product Characteristics Chapter 1 Product Characteristics

11 12
LP-532 REV. 8.13.2014 LP-532 REV. 8.13.2014
Chapter 1 Product Characteristics Chapter 1 Product Characteristics
Check setting
values (Setting
Temp, Errors)
Initializing equipment
(Timer, Stepping Motor, Gas Valve and
Others)
Clear Watchdog
Check
communication
Check A/DC
Check Error
Check Water Flow
(ignore below 0.39
GPM)
Igniter, Gas
Valve "OFF"
RPM for Pre-purge,
Time Setting
Set RPM for
Pre-purge
Setting for Fan
stop
MCU Testing
Igniter "ON"
Gas Valve "ON"
Igninter "OFF"
Check Fan RPM
Water Flow >= 0.39 GPM, and
Doesn't have Error (Front Panel
"ON")
Step for
Pre-purge
Water Flow >=
0.53 GPM
Step for
Post-purge
Post-purge time
>=
setting RPM
Finish for
Pre-purge
Check condition
for RPM, Flame
Ignition
Igniter "ON"
Time >=
1.5 sec
Gas Valve "On"
Time >= 2sec
Detecting RPM,
Flame (Normal)
MCU testing
cycle >= 30min
Decide controlling calue for Fan,
Mixing valve, AGM, IWM
Gas Valve
"OFF"
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
N
Y
N
N
N
N
N
N
NN
N
N
N
Start
MCU Testing
Check Error
N
Y
Flame Extinction >=
8 times
Ignition Failure >=
10 times
Water Temperature
>= 199 ℉
Opened High Limit
Opened value for
APS
Inlet Temperature
sensor Open or
Short
Exhaust
Temperature sensor
Open or Short
Inlet Temperature
sensor Open or
Short
Exhaust
Temperature sensor
Open or Short
Abnormal MCU
Detecting
False-flame
Detecting Gas
leakage
Jumped Wire
Connection
Tilt Switch Open
and/or Short
Burner High Limit
Switch Switch
Cut-off
Abnormal RPM
sensor
Zero reference error
of supply water
valve
Zero reference error
of mixing valve
Failed self test of
MCU's internal
device
MCU Error
Flame is detected
before ignition
Abnormal DIP
switch setting
Communication
failure
Exhaust
Temperature >=
149℉
ERROR 10
ERROR 11
ERROR 16
ERROR 20
ERROR 29
ERROR 31
ERROR 32
ERROR 33
ERROR 35
ERROR 38
ERROR 39
ERROR 40
ERROR 41
ERROR 42
ERROR 43
ERROR 61
ERROR 65
ERROR 66
ERROR 67
ERROR 70
ERROR 72
ERROR 73
ERROR 76
ERROR 94
C heck s etting
values (S etting
Temp, E rrors )
Initializing equipment
(Timer, S tepping Motor, G as V alve and
Others )
C lear W atchdog
C heck
communication
C heck A/DC
C heck E rror
C heck W ater F low
(ignore below 0.39
G P M)
Igniter, Gas
V alve "OF F "
R P M for P re-purge,
Time S etting
S et R P M for
P re-purge
S etting for F an
stop
MC U T es ting
Igniter "ON"
G a s V a lve "O N"
Igninter "OF F "
C heck F an R P M
W ater F low >= 0.39 G P M, and
Doesn't have E rror (F ront P anel
"ON")
S tep for
P re-purge
Water F low >=
0.53 G P M
S tep for
P os t-purge
P os t-purge time
>=
s etting R P M
F inish for
P re-purge
C heck condition
for R P M, F lame
Ignition
Igniter "ON"
T ime >=
1.5 sec
G a s V a lve "O n"
T ime >= 2s ec
Detecting R P M,
F lame (Normal)
MC U tes ting
cycle >= 30min
Decide controlling calue for Fan,
Mixing valve, AG M, IW M
G a s V alve
"O F F "
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
N
Y
N
N
N
N
N
N
NN
N
N
N
S tart
MC U T es ting
C heck E rror
N
Y
F lame E xtinction >=
8 times
Ignition F ailure >=
10 times
W ater T emperature
>= 199 ¢ µ
Opened High Limit
Opened value for
AP S
Inlet T emperature
sens or O pen or
S hort
E xhaus t
T emperature s ensor
Open or S hort
Inlet T emperature
sens or O pen or
S hort
E xhaus t
T emperature s ensor
Open or S hort
Abnormal MC U
Detecting
F als e-ame
Detecting Gas
leakage
Over range of
s etting R P M
Jumped Wire Disconnected
B urner High Limit
S witch S witch
Cut-o
Abnormal R P M
sens or
Zero reference error
of s upply water
valve
Zero reference error
of mixing valve
F ailed self tes t of
MC U's internal
device
MC U E rror
F lame is detected
before ignition
Abnormal DIP
switch setting
C ommunication
failure
E xhaus t
T emperature >=
149¢ µ
E R R OR 10
E R R OR 11
E R R OR 16
E R R OR 20
E R R OR 29
E R R OR 31
E R R OR 32
E R R OR 33
E R R OR 35
E R R OR 38
E R R OR 39
E R R OR 40
E R R OR 41
E R R OR 42
E R R OR 43
E R R OR 61
E R R OR 65
E R R OR 66
E R R OR 67
E R R OR 70
E R R OR 72
E R R OR 73
E R R OR 76
E R R OR 94
Operation Flow Chart Operation Flow Chart
C heck s etting
values (S etting
Temp, E rrors )
Initializing equipment
(Timer, S tepping Motor, G as V alve and
Others )
C lear W atchdog
C heck
communication
C heck A/DC
C heck E rror
C heck W ater F low
(ignore below 0.39
G P M)
Igniter, Gas
V alve "OF F "
R P M for P re-purge,
Time S etting
S et R P M for
P re-purge
S etting for F an
stop
MC U T es ting
Igniter "ON"
G a s V a lve "O N"
Igninter "OF F "
C heck F an R P M
W ater F low >= 0.39 G P M, and
Doesn't have E rror (F ront P anel
"ON")
S tep for
P re-purge
Water F low >=
0.53 G P M
S tep for
P os t-purge
P os t-purge time
>=
setting R P M
F inish for
P re-purge
C heck condition
for R P M, F lame
Ignition
Igniter "ON"
T ime >=
1.5 sec
G a s V a lve "O n"
T ime >= 2s ec
Detecting R P M,
F lame (Normal)
MC U tes ting
cycle >= 30min
Decide controlling calue for Fan,
Mixing valve, AG M, IW M
G a s V alve
"O F F "
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
N
Y
N
N
N
N
N
N
NN
N
N
N
S tart
MC U T es ting
C heck E rror
N
Y
F lame E xtinction >=
8 times
Ignition F ailure >=
10 times
W ater T emperature
>= 199 ¢ µ
Opened High Limit
Opened value for
AP S
Inlet T emperature
sens or O pen or
S hort
E xhaus t
T emperature s ensor
Open or S hort
Inlet T emperature
sens or O pen or
S hort
E xhaus t
T emperature s ensor
Open or S hort
Abnormal MC U
Detecting
F als e-ame
Detecting Gas
leakage
Over range of
s etting R P M
Jumped Wire Disconnected
B urner High Limit
S witch S witch
Cut-o
Abnormal R P M
sens or
Zero reference error
of s upply water
valve
Zero reference error
of mixing valve
F ailed self tes t of
MC U's internal
device
MC U E rror
F lame is detected
before ignition
Abnormal DIP
switch setting
C ommunication
failure
E xhaus t
T emperature >=
149¢ µ
E R R OR 10
E R R OR 11
E R R OR 16
E R R OR 20
E R R OR 29
E R R OR 31
E R R OR 32
E R R OR 33
E R R OR 35
E R R OR 38
E R R OR 39
E R R OR 40
E R R OR 41
E R R OR 42
E R R OR 43
E R R OR 61
E R R OR 65
E R R OR 66
E R R OR 67
E R R OR 70
E R R OR 72
E R R OR 73
E R R OR 76
E R R OR 94

13 14
LP-532 REV. 8.13.2014 LP-532 REV. 8.13.2014
CN11
CN9
CN10 CN12
CN8
CN6
CN1
CN3
CN14 CN4
CN5
CN7
Wiring diagram
Chapter 1 Product Characteristics Chapter 1 Product Characteristics
Jumper Wire

15 16
LP-532 REV. 8.13.2014 LP-532 REV. 8.13.2014
Connector
Descriptions HT
SELV
no. of location and
type Pin nr. Board Silk
CN9
65001WS-12
1 - Unused -
2 L Power Supply Line HT (120VAC)
3 CP1 Unused HT (120VAC)
4 IT Igniter HT (120VAC)
5 L(HT) Heater HT (120VAC)
6 GV Gas Valve HT (120VAC)
7 EARTH GROUND HT (120VAC)
8 N Power Supply Neutral HT (120VAC)
9-12 N AC Power COM Line HT (120VAC)
CN1
SMW250-03
1
RS-485
RS485 + SELV (5VDC)
2 GND SELV (5VDC)
3 RS485 - SELV (5VDC)
CN4
LWD1140-06
1
FAN
Unused -
2 GND SELV (30VDC)
3 VDD SELV (14VDC)
4 Fan power(start coil) SELV (30VDC)
5 Fan power(end coil) SELV (30VDC)
6 Fan speed feedback signal SELV (14VDC)
CN8
SMW250-04
1
MCU ISP
GND SELV (5VDC)
2 ISP /Reset port SELV (5VDC)
3 ISP TOOL0 Data port SELV (5VDC)
4 VCC SELV (5VDC)
CN11
LWD1140-16
1HWL Unused -
8
2LWL Unused -
10
3HD Unused -
11
4TH Connect to the Display Con-
trol(Thermostat) SELV (14VDC)
12
5APS Air Pressure Switch SELV (14VDC)
13
6EL Jumper Wire SELV (14VDC)
14
7BL Burner Limit SELV (14VDC)
15
8HL High Limit SELV (14VDC)
16
CN5
SMW250-10
1RPM FAN RPM Check SELV(5VDC)
2GND SELV(5VDC)
Connector
Description HT
SELV
no.oflocationand
type
Pin
nr.
Board
Silk
CN7
LWD1140-14
1F.S Flame Detect Sensor SELV(5VDC)
8
2OP.S Operation water temperature sensor SELV(5VDC)
9
3DH.S DHW temperature sensor SELV(5VDC)
10
4I.S Inlet water temperature sensor SELV(5VDC)
11
5BG.S Exhaust temperature sensor SELV(5VDC)
12
6ST.S Unused -
13
7SP.S Unused -
14
CN12
SMW250-07
1
AGM
AGM Stepper motor coil /Y phase SELV(24VDC)
2AGM Stepper motor coil Y phase SELV(24VDC)
3AGM Stepper motor coil /X phase SELV(24VDC)
4AGM Stepper motor coil X phase SELV(24VDC)
5GND SELV(24VDC)
6AGM Stepper motor position SELV(14VDC)
7VDD SELV(24VDC)
CN10
SMW250-08
1
DHM
DHM Stepper motor coil /Y phase SELV(14VDC)
2DHM Stepper motor coil Y phase SELV(14VDC)
3DHM Stepper motor coil /X phase SELV(14VDC)
4DHM Stepper motor coil X phase SELV(14VDC)
5GND SELV(14VDC)
6DHM Stepper motor position SELV(14VDC)
7Unused SELV(14VDC)
8VDD SELV(14VDC)
CN14
SMW250-09
1
IWM
GND SELV(14VDC)
2IWM Stepper motor position SELV(14VDC)
3VDD SELV(14VDC)
4IWM Stepper motor coil X phase SELV(14VDC)
5IWM Stepper motor coil Y phase SELV(14VDC)
6VDD SELV(14VDC)
7IWM Stepper motor coil /X phase SELV(14VDC)
8IWM power IWM Stepper motor coil /Y phase SELV(14VDC)
9Unused -
CN3
SMW250-06
1
WPS
Unused SELV(5VDC)
2Unused SELV(5VDC)
3Unused SELV(5VDC)
4
FLUX1
VCC SELV(5VDC)
5Water Flow Sensor SELV(5VDC)
6GND SELV(5VDC)
Chapter 1 Product Characteristics Chapter 1 Product Characteristics

17 18
LP-532 REV. 8.13.2014 LP-532 REV. 8.13.2014
Description/Part # Main Control Board / 7850P-058 Check Point
(Main PCB) N/A
Function This part controls all components contained in the water heater
Failure Event Abnormalmaincontrolleroperation.
E󰘯ects Whenthemaincontroller hasabnormalcondition,componentsmaynotoperate
properly.
Error Code Er 38
Diagonostic Check each connection and/or wires damage on the PCB
Color/WireNumber N/A
Exhaust temperature Sensor
Water inlet temperature sensor
Heat Exchanger temperature
Water outlet temperature sensor
NO Item Standard
1
Temperature –
Resistance Type
Idling Condition
Temperature(℃) Resistance(kΩ)
0 ± 0.1 ℃-10.99
25 ± 0.1 ℃-3.906
85 ± 0.1 ℃0.552 ± 3%
Blank is for reference measurement
2B Fixed Number
(25/85) 3482.4K ± 2%
3Fixed Number of
Heat dissipation 2.5mW/℃(Min.) (While not boiling)
4Fixed Number of
Heating
8(15)Sec (Max)(63.2% reaching time
while boiling)
5Range of Workable
Temperature -4 ~ 230 F
①②③④⑤⑥⑦
⑧⑨⑩⑪⑫⑬⑭
Chapter 2 Components description Chapter 2 Components description
CN7
Description/Part #
HX Temperature Sensor / 7850P-081
ExhaustTemp.Sensor/7850P070
Water Outlet Sensor / 7850P-019
Water Inlet Sensor / 7850P-015
Check Point
(Main PCB) CN7
Function The controller compares each sensor with setting temperature then goes to safety
shutdownwhenmeasuredtemperatureisoversettingtemperature.
Failure Event Sensormalfunctionoroverheatingconditionisdetected.
E󰘯ects Impropertemperaturemeasurement.
Error Code Er 16, Er 31, Er 33, Er 35
Diagonostic ①Checktemperaturesensorswiringconnection.
②measuresensorresistanceusingamultimeter.
Color/WireNumber
①Exhausttemperaturesensor(white/blue):Connector⑤,⑫
②WaterInlettemperature(blue/blue):Connector④,⑪
③HeatExchangerTemperatureSensor(white/black):Connector②,⑨
④WaterOutletTemperature(yellow/yellow):Connector③,⑩

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LP-532 REV. 8.13.2014 LP-532 REV. 8.13.2014
Description/Part # Freeze protection heater / 7850P-
076
Check Point
(Main PCB) CN9
Function This components prevents the water piping from freezing when water temperature in the
pipesislowerthan33F.
Failure Event Whentemperatureislowerthan33Forceramicheaterisnotworkingproperly.
E󰘯ects Damageoftheproductiscausedbyfreezingcondition.
Error Code N/A
Diagonostic Checktheconnectionaroundtheceramicheater.
Color/WireNumber Ceramic Heater (White) : Connector ⑤,⑪
Description/Part # Burner Overheat Switch /
7850P-009
Check Point
(Main PCB) CN9 ,CN11
Function BunnerOverbheatSwitchpreventsdamagestotheburnerplatecausedby
temperatureexceeding302F.
Failure Event Detectsoverheatingtemperatureisswitchhasanobnormalcondition.
E󰘯ects WaterHeatershutsdownifburnerplatetemperatureexceedsthesetting
temperature
Error Code Er 20, Er 43
Diagonostic
①Checktheconnectionaroundtheburneroverheatswitchandmeasure
resistancebyusingamultimeter.
②ChecktheDipSwitchsetting.
③Checkgasori󰘰cenozzles.
Color/WireNumber ①Burnercase(Red):Connector⑦,⑮
②Heatexchangeroutletpipe(Red):Connector⑧,⑯
①②③④⑤⑥⑦⑧
⑨⑩⑪⑫⑬⑭⑮⑯
① ② ③ ④ ⑤ ⑥
⑦ ⑧ ⑨ ⑩ ⑪ ⑫
Chapter 2 Components description Chapter 2 Components description
CN9
CN9, CN11

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Description/Part # Jumper Wire Connection / 7850P-096 Check Point
(Main PCB) CN 11
Function This part is used to jump out circuit
Failure Event Jumperisdisconnected.
E󰘯ects Thunitshutsdown.
Error Code Er 42
Diagonostic ①Makesurethejumperisproperlyconnected.
Color/WireNumber Jumpedwireconnection(white):connector⑥,⑭
Description/Part # Gas Leak Detection Sensor /
7850P-093
Check Point
(Main PCB) N/A
Function This senosr shutsdown the unit if gas leak is detected
Failure Event Gas leak detection sensor is not operating properly
E󰘯ects Risk of explosion and personal injury
Error Code Er 40
Diagonostic
①Followinstructiononthe󰘰rstpageofthemanual.Checkforleakagearoundthegas
valveandgaspipingbyusingsoapywater.
②Checktheburnerassembly
Color/WireNumber N/A
①②③④⑤⑥⑦⑧
⑨⑩⑪⑫⑬⑭⑮⑯
Chapter 2 Components description Chapter 2 Components description
CN11

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LP-532 REV. 8.13.2014 LP-532 REV. 8.13.2014
Description/Part # MixingValve/7850P054 Check Point
(Main PCB) CN 10
Function ThiscomponentcontrolsDHWoutlettemperaturebymixingcoldandhotwater.
Failure Event ①Water󰘱owisnotdetectedand/orwaterleakageoccursaroundthemixingvalve.
②Abnormalmixingvalveoperation.
E󰘯ects ①Ignitionsequencedoesnotstart.
②Operationofproductisstoppedoncewaterleakageisdetected.
Error Code Er 66
Diagonostic ①Restarttheproduct.
②Checktheconnectionaroundthemixingvalve.
Color/WireNumber
[MixingValve]
DHMYPhase(black):connector①
DHMYPhase(brown):connector②
DHMXPhase(red):connector③
DHMXPhase(orange):connector④
GND(yellow):connector⑤
DHMPositionsensor(green):connector⑥
Flow2sensor(blue):connector⑦
DC14V(white):connector⑧
Description/Part # APS: Air Pressure Switch /
7850P-047
Check Point
(Main PCB) CN 11
Function Thiscomponentmonitorsthe󰘱ueforblockage.
Failure Event
①Combustionnoiseisgenerated.
②Imperfectandlifting󰘱ameoccurs.
③Theunitwillnotignite.
E󰘯ects Pressureduetoexhaustblockagewilla󰘯ectthewaterheateroperation.
Error Code Er 29
Diagonostic
①CheckAPSwiringconnection
②Checkthehoseforblockageorkinking.
③Checkexhaustventforblockage
④CheckAPSresistanceusingamultimeter.
Color/WireNumber Airpressureswitch(blue):connector⑤,⑬
1. Cold water and hot water mixed
2. Step Control Motor Applied.
3. Operating Fluid : 0℃~80℃ (32 ~ 176℉)
4. Operating Pressure: 0~0.98Mpa
5. Supply Voltage : DC24V
6. PPS material Body
7. DHM : Domestic Hot water Mixing Modulation
①②③④⑤⑥⑦⑧
⑨⑩⑪⑫⑬⑭⑮⑯
①②③④⑤⑥⑦⑧
Chapter 2 Components description Chapter 2 Components description
CN11 CN10

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LP-532 REV. 8.13.2014 LP-532 REV. 8.13.2014
Description/Part # Inlet Water Filter / 7850P-017 Check Point
(Main PCB) N/A
Function ThiscomponentconsistsofdurableSTS,PPSmaterialfor󰘰lteringoutdebrisandheavy
metals.
Failure Event Inputcapacityofcoldwaterisnotconstantandthermale󰘲ciencyispoor.
E󰘯ects Noiseattheheatexchangerisgeneratedandpipesareblockedbythedebris.
Error Code N/A
Diagonostic CleantheColdwaterinlet󰘰lter.
Color/WireNumber N/A
Description/Part # FlowControlValve/7850P-053 Check Point
(Main PCB) CN 14, CN 3
Function Thecomponentdetectswater󰘱owandregulateswater󰘱owrateinordertosupply
stablehotwater(Morethan0.5GPM).
Failure Event Water󰘱owrateisnotdetectedandwaterleakageoccursaroundthe󰘱owcontrolvalve.
E󰘯ects ①Ignitionsequencedoesnotstart.
②Operationofproductisstoppedoncewaterleakageisdetected.
Error Code Er 65
Diagonostic ①Restarttheunit
②Checktheconnectionaroundthe󰘱owcontrolvalve.
Color/WireNumber
[IWM(InletWaterModulation)]
GND(yellow):connector①
IWMSteppermotorposition(green):connector②
VDD(white):connector③
IWMSteppermotorcoilXphase(red):connector④
IWMSteppermotorcoilYphase(black):connector⑤
VDD(blue):connector⑥
IWMSteppermotorcoil/Xphase(orange):connector⑦
IWMSteppermotorcoil/Yphase(brown):connector⑧
1.PPSmaterialBody
2.Hallsensorratedvoltage
DC5~24V10mA.Max
3.OperatingFluid:
0℃~80℃(32~176℉)
4.Operatingrange:
1.2~30ℓ(0.32~8gpm)
VCC(red):connector④
Water󰘱owsensor(white):connector⑤
GND(blue):connector⑥
Inletwater󰘰lter
①②③④⑤⑥
①②③④⑤⑥⑦⑧⑨
①②③④⑤⑥⑦⑧
Chapter 2 Components description Chapter 2 Components description

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LP-532 REV. 8.13.2014 LP-532 REV. 8.13.2014
Description/Part # Flame Detection Sensor /
7850P-031
Check Point
(Main PCB) CN 7
Function Detects󰘱ameduringcombustion
Failure Event Ignitionfault.
E󰘯ects Abnormalproductoperation.
Error Code Er 11, Er 39, Er 72
Diagonostic ①Checkthediscolorationof󰘱amemonitoringwindow.
②Checktheconnectionaroundthe󰘱amedetectionsensor.
Color/WireNumber FlameDetectSensor(red)①:connector①
FlameDetectSensor(black)②:connector⑧
Description/Part # Ignition Transformer / 7850P-045 Check Point
(Main PCB) CN 9
Function Generatessparksenergytoignitethefuel.
Failure Event Sparksenergyisnotgenerated.
E󰘯ects Theunitdoesnotignite.
Error Code Er11
Diagonostic ①Checkwiringforproperconnection
②Checkvoltagerange
Color/WireNumber IgnitionTransformer(red):connector④
IgnitionTransformer(red):connector⑩
Input voltage Output current Output voltage
120V60Hz 15 ± 2kW 6 ± 2mA
1.ElectricalCharacteristics
-Maximumworkablevoltage:DC35V
-Maximumallowablecurrent:DC30mA
- Maximum power dissipation :DC 80mW
2.Opticalcharacteristics
-Darkcurrent:0.05uA/MAX(0.6uA)
[Condition: 0LX (Intensity of illumination),
10V(Voltage)]
- Spectrum luminosity curve
: 880nm ( Peak Sensitivity )
- Range of sensing : 800 ~ 1000nm
① ② ③ ④ ⑤ ⑥
⑦ ⑧ ⑨ ⑩ ⑪ ⑫
①②③④⑤⑥⑦
⑧⑨⑩⑪⑫⑬⑭
①②
Chapter 2 Components description Chapter 2 Components description
CN9
CN7

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Description/Part # GasValve/7850P-012 Check Point
(Main PCB) CN9
Function Negative gas valve controls the regulation of gas and air mixture in the combustion
system.
Failure Event
① Gas leakage occurs.
② Gas valve does not operated. (Unable to open/close)
③ Gas flow is not modulated. (Proportional gas valve)
E󰘯ects
① Spark is not generated..
③ Operation of product is stopped.
④ Carbon monoxide exceeding the reference is discharged.
Error Code Er 10
Diagonostic
① Check wiring for proper connection.
② Check the connection and mounting location.
③ Check resistance by using a multimeter.
Color/WireNumber GasValve(purple):connector⑥,⑫
Description/Part # Air Gas Mixer / 7850P-004 Check Point
(Main PCB) CN12
Function Thecomponentprovidesproperairandgasmixturetotheburner.
Failure Event ①Imperfectcombustionoccurs.
②lifting󰘱ameoccurs.
E󰘯ects ①Abnormalproductoperation.
②Carbonmonoxideexceedingthereference.
Error Code Er 67
Diagonostic
①Restartthewaterheater.
②Checkwiringforproperconnection.
③Checkthefanintake.
Color/WireNumber
AirGasMixer(black):①connector (AGM/Y Phase)
AirGasMixer(brown):②connector (AGM/Y Phase)
AirGasMixer(red):③connector (AGM/X Phase)
AirGasMixer(orange):④connector (AGM/X Phase)
AirGasMixer(yellow):⑤connector (GND)
AirGasMixer(green):⑥connector (AGM Position Sensor)
AirGasMixer(white):⑦connector(DC24V)
1.OperatingTemperature:32~140F
2.Usingthegaspressure:5kPa
3.Maximumamountofgas:5.5m3/hr(LNG)
4.T/D(Turn/Downratio):1:10
5.MotorSpeci󰘰cation
- Type : Stepping Motor
- Phase : 4 Phase
-Drivetype:UnipolarDrive/V-Constant
- Supply Power : 24v DC
- Phase excitation system : 2-2
-Stepangle:7.5deg(2-2Phase),(1-2Phase:3.75deg)
- Direction of rotation : CW / CCW (Bidirectional)
- Reduction ratio : 1 / 60
1.Backpressure
:1stvalve:50mbar
:2ndvalve:10mbar
2.Ambienttemperature:
:-15℃...70°C(5~158℉)
3.Maxinletpressure:60mbar
4.OperatingRatings:24V/50Hz
5.ElectricalLoad
:1st+2ndoperator420mAat24VRAC
①②③④⑤⑥⑦
① ② ③ ④⑤ ⑥
⑦ ⑧ ⑨ ⑩ ⑪ ⑫
Chapter 2 Components description Chapter 2 Components description
CN12
CN9

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Description/Part # MetalFiberPremixBurner/
7850P-011
Check Point
(Main PCB) N/A
Function Thecomponentsuppliestheheatsourcebymixingandcombustingtheairand
gas.
Failure Event
①Unabletoinitialize/sustaincombustion.
②Sootoccursonthesurfaceofburner.
③Gasleakageoccursfromburner.
E󰘯ects
①Abnormalcombustion.
②Unstable󰘱amegeneration.
③Ignitionfailure.
Error Code N/A
Diagonostic Visualinspection:Unstable󰘱ameconditionsduringoperation.
Color/WireNumber N/A
Description/Part # BLDC Fan / 7850P-002 Check Point
(Main PCB) CN4
Function Supplies ir and fuel to the burner.
Failure Event
① Abnormal noise occurs at the fan.
② Abnormal fan speed(RPM).
③ Poor connection.
E󰘯ects
① Abnormal combustion.
② Abnormal noise occurs.
③ The unit does not operated.
Error Code Er 41
Diagonostic
① Check vent blockage
② Check BLDC fan wiring for proper connection
③ Check voltage range using a multimeter.
Color/WireNumber
[BLDCFAN]
GND(blue)ⓒ:connector②,30vDC
Fanstartcoil(white)ⓔ:connector④,30vDC
Speedfeedbacksignal(yellow)ⓓ:connecotr⑥ ,30vDC
DC14V(red)ⓑ:connector③,14vDC
Power(black)ⓐ:connector⑤ ,30vDC
1.RatedSpeci󰘰cations
- Motor type : DC BRUSHLESS MOTOR
-RatedVoltage:Vs=24V/Vc=12V
-WorkingVoltage:Vs=10~24V/Vc=12±1.2V
-WorkingAmpere:As=140~800/Ac=17±1.7
- Control System : PWM
ⓐ ⓑ ⓒ ⓓ ⓔ
① ② ③
④ ⑤ ⑥
Chapter 2 Components description Chapter 2 Components description
CN4

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Description/Part # Condensate Trap / 7850P-014 Check Point
(Main PCB) N/A
Function Thecomponentreliablydischargesthecondensategeneratedbythe
combustion.
Failure Event Unneutralizedcondensateisdischarged.
E󰘯ects Productcorrosionandenvironmentaldegradationarecausedbythe
condensate.
Error Code Er41
Diagonostic Check the hose for blockage or bending.
Color/WireNumber N/A
Description/Part # Heat Exchanger(STS) /
7850P-032
Check Point
(Main PCB) N/A
Function Thecomponentheatsthewaterbyabsorbinghigh-temperatureheatgeneratedbythe
burner.
Failure Event ①Waterorexhaustgasleakagethroughthecrack.
②Abnormalheatexchange.
E󰘯ects
①Operationofproductisstopped.
②Exhaustgasleakage.
③Abnormalnoiseoccurs.
Error Code Er33, Er94
Diagonostic Checkthecrackonthesurfaceofheatexchanger.
Color/WireNumber N/A
Chapter 2 Components description Chapter 2 Components description

35 36
LP-532 REV. 8.13.2014 LP-532 REV. 8.13.2014
Function explanation
[Initial power-up condition]
Whenpowerissupplied,zeropointofthemixingvalveischeckedfor6seconds.Afterthat,normal
800stepsfunctionisinprogress.Atthistime,ifzeropointisnotconfirmed,Er66occurs.Aftererroris
automaticallyrestoredwhenzeropointwascon󰘰rmed,normal800stepfunctionisinprogress.
[DHW mode]
 DHWmodeisactivatedbythe󰘱owsensorsensing󰘱owof0.5GPMorabove.WhenthereisDHW
demand,󰘱owsensormonitorthefrequency(range:8Hzto12Hz),within2minutes.DHWtemperaturecanbe
set95~140℉(35℃~60℃).IfthereisDHWdemand,burnerstartsandmixingvalveoperatesautomatically.
Safety device function
[Power supply and frequency stability protection]
 Ifthepowersupplyvoltageislessthan90Vinputfor10seconds,errorcodewillbedisplayed,and
alloutputswillbestoppedexceptforthefanpost-purge.Theerrorwillautomaticallresetwhenvoltageis
abore100V.
 Thereferencefrequecyvalueisdeterminedbycheckingthepowersupplyfrequency50Hzor60Hz.
Iffrequencyisoutsidetherangeof±3Hzfromthereferencefrequency,errorcodewillbedisplayed,andall
outputswillbestoppedexceptforthefanpost-purge.Theerrorwillautomaticallresetwhenthefrequencyis
whithin±3Hzoffrequencystandards.
[Over-heating protection]
 Thewaterheaterhastwoovertemperatureswitch.Overtemperatureswitchisattachedtotheburner
andtheoutletsideagainstthefailureofthetemperaturesensordualprotectiondevice.Overheaterror
occurswhenthetemperatureswitchisopenandcloseuntilthefanisoperated.
[Gas leakage detecting]
 Thecontrollerisdesignedwithabuiltingasleakdetectionsensorthatwillshuttheunitdownincase
ofgasleak.Afaultcodewilloccurifthesensordetectsgasleakformorethan10minutesor3timesin1
hour.
[Mixing valve operation]
 DuringaDHWdemand,mixingvalvemodultaestocontroltheDHWoutlettemperaturebymixing
thecoldandhotwater.WhenthereisnoDHWdemand,mixingvalvestandsvyat800steps.Toprevent
the mixing valve mechanism from getting stuck, it moves 2,000 steps (fully closed) for 5 sec, then moves to
defaultposition(fullyopened)and󰘰nallybackto800step.
Chapter 3 How to use control panel
Control panel
ControllerLCDSpeci󰘰cation
Customized Temperature Control
Advancedtechnologyusedforthe󰘱owsensorandheatcapacitycontrolmakesdomestichotwaterhighly
e󰘲cientbymaintainingconstanttemperatureduringusage.
Chapter 3 How to use control panel
Control Panel Mode
Status display mode
StatusdisplaymodewillbeactivatedwhenbuttonBispressedandheldfor󰘰veseconds
whendisplaypanelispoweredON.

37 38
LP-532 REV. 8.13.2014 LP-532 REV. 8.13.2014
¡É
¢µ
HIGH
¡É
¢µ
HIGH
HIGH
C
F
HIGH
C
F
HIGH
C
F
DomesticHotwatertemperaturecontrol(Range:95~122℉)
DomesticHotwaterhightemperaturecontrol(Range:121℉~140℉)
Turn the dial to set desired DHW
temperature.
Press‘dialbutton’tocomplete
setting.
Press ‘heating water temperature
button’formorethan5secsto
converttemperatureunit(ForC).
Press ‘hot water
temperature control
button’toenter‘DHWtemperature
settingmode.Thedefaulttempera-
ture is set 125℉.
Press ‘hot water temperature
button’for5secstosethigh
temperature.
Turn the dial to set desired
DHWtemperature. Press‘dialbutton’tocomplete
setting.
Press ‘hot water
temperature control
button’toenter
‘DHW temperature
settingmode.Thedefaulttempera-
ture is set to 125℉.
Chapter 3 How to use control panel
HIGH
C
F
HIGH
C
F
HIGH
C
F
HIGH
C
F
HIGH
C
F
Presspowerbuttontoturnonthe
unit.
Presspowerbuttontoturnonthe
unit.
Chapter 3 How to use control panel
Parameter
Detail
Description
A: Li or A: GA
Flow 1
Current Flow Value (Li: Liters/min, GA: Gallons/min)
b: Fr
Fan rpm
Current Fan RPM Value
C: Lc Lock Mode
Lock Mode is In Use (ON) or Unused (OFF)
Allows user to lock out any temperature change.
d: oP
OP Temperature
Current Operating Temperature
E: dH
DHW Temperature
Current DHW Temperature
F: Eh
Exhaust Temperature
Current Exhaust Temperature
h: In
Inlet Temperature
Current Inlet Temperature
L:rt
Running Time
Display Running Time
L:rt
1: PH
Power Supply Time
Power Supply Time: 100 hour increments
2: rh
Burner Operating Time
Burner Operating Time: 1 hour increments
3: rH
Burner Operating Time
Burner Operating Time: 1,000 hour increments
4: It
Ignition Attempts Number
Ignition Attempts Number: 10 times unit displayed
5: IH
Ignition Attempts Number
Ignition Attempts Number: 10,000 times unit displayed
J: AG
N/A
N/A
P-920C
HIGH
P-920C
HIGH
Installer Setting Mode.
StatusdisplaymodewillbeactivatedwhenbuttonBispressedandheldfor󰘰veseconds
whendisplaypanelispoweredOFF.
Index
Default
Parameter
Description
1: EH
E0:00
History
Most Recent History Error Codes (H0 –H9)
2: cE
OFF
Clear Error History
Clears Error History
3: In OFF System Reset
Restores System to Default Settings
(Burner operation time, Ignition cycles, and Supply
power time will not be reset)
Range: ON or OFF
4: Fu GA Flow Unit
Displays Flow Rate in Liters/Minute or Gallons/Minute
Range: GA or Li
5: FH
00
N/A
N/A
6: FL
00
N/A
N/A
7: dr
NO
Reset Burner Operation Time
Reset Burner Operation Time
8: dI
NO
Reset Number of Ignition
Reset Number of Ignition
9: HA
-
N/A
N/A
10: Cn
00
N/A
N/A
11: CI
01
N/A
N/A
12: Eh
ON
N/A
N/A