A.O. Smith T-D2-OS Bedienungsanleitung

T-D2-IN/T-D2-OS Service Manual

Ver. 1.00

CONFIDENTIAL

   

T-D2-IN / T-D2-OS

On-Demand Water Heater

Service Manual

T-D2-IN

A.O. Smith Water Products Company

500 Tennessee Waltz Parkway

Ashland City, TN 37015

Toll Free: 1

877

737

2840

T-D2-OS

T-D2-IN/T-D2-OS Service Manual

Ver. 1.00

CONFIDENTIAL

Table of Contents

Specifications………………………………………...…...………….……………………...…………………………

Exterior view……………………...…….……………………………………………………………………………....

Interior view…………………………….………………………………………………………………………………..

List of main components in the interior view…….…………………………………………………….…

Schematic diagram…………………………………………………………………………………………………….

Wiring diagram………………………………………………………………………………………………………….

Wiring diagram checkpoints for diagnosis………………………..………………….………………….…

Resistance values of the temperature thermistors…………..…………………………………………

Operational flow chart…………………………………………………………………………………………….…

10.

Component specifications………………...…………………………………………………………………….…

11.

FaultAnalysis &Specifications…………………………………………………………………………………..

12.

Controls and settings……………………………………………………………………………………………….…

13.

Components diagrams………………………………………………………………..................................

14.

Parts list……………………………………………………………………………………………………………………..

15.

Revisions……………………………………………………...………………………………………………………......

T-D2-IN/T-D2-OS Service Manual

Ver. 1.00

CONFIDENTIAL

1. Specifications

Model T-D2-IN T-D2-OS

Dimensions H20.5"×W13.8"×D8.5"

Weight 39 lbs.

Combustion

INPUT

BTU/h Max 199,000

Min 11,000

Combustion System

Power vent

Installation Indoor & Direct-vent Outdoor

Fan motor PWMturbo fan PWN multi blade fan motor

Manifold

Pressure*

Max LP 3.5” WC

Natural 2.0” WC LP 4.4” WC

Natural 2.8” WC

Min LP 0.7” WC

Natural 0.4” WC LP 0.9” WC

Natural 0.5” WC

Water control

Flow rate 0.75 to 10.0 GPM

Available set

temperatures 99 to 185°F

default: 122°F

Temperature

dipswitch settings

104°F, 113°F, 122°F, 131°F, 140°F, 158°F, 176°F,185°F

Bypass valve Yes

Thermistors 3 thermistors (In, Out, Mixing)

Operation

Remote controller

model TM-RE30

PCB model T-D2

Indicators Red LED on PCB during operation & 7-SEG LED

Power supply

control Surge absorber & Power ON-OFF switch

Features

Freezeprotection

Ceramic heaters and Auto-firing system

Self-combustion

improvement Air-FuelRatio Detection System

Easy-Link system

Yes (Up to 4 units)

Multiple-system

N/A

*The manifold pressuremeasurement is based on conditions without front cover.

T-D2-IN/T-D2-OS Service Manual

Ver. 1.00

CONFIDENTIAL

2. Exterior view

Top view Bottom view

Side view Front view

COLD 2-7/8" (71mm)

HOT 6-1/2" (164mm)

HOT 5-1/4" (133mm) GAS 4-7/8" (124mm)

GAS 5-1/4" (135mm)

120VAC 3-7/8" (99mm)

120VAC 1-3/8" (36mm)COLD 3-1/4" (84mm)

13-1/8" (334mm)

4-3/8" (113mm)

5-1/8" (130mm)

T-D2-IN

13-3/4" (350mm)

10" (254mm)

1-3/4" (45mm) 1-3/4" (45mm)

1-3/8" (36mm)

3-9/8 ( 101mm)

21-3/8" (544mm)

20-1/4" (520mm)

1-7/8" (47mm)

HOT 5-1/4" (133mm)

120V 1-3/8" (36mm)

GAS 4-7/8" (124mm)

COLD 3-1/4" (84mm)

4-3/8" (113mm)

19-3/8" (493mm)

COLD 2-7/8" (71mm)

1" (26mm)

HOT 6-1/2" (164mm)

9-1/2" (241mm)

120VAC 3-7/8" (99mm)

GAS 5-1/4" (135mm)

2-1/4" (58mm)

T-D2-IN / T-D2-OS Service Manual

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CONFIDENTIAL

Sideview Frontview

Bottom view

Top view

T-D2-OS

13-3/4" (350mm)

10" (254mm)

1-3/4" (45mm) 1-3/4" (45mm)

21-3/8" (544mm)

20-1/4" (520mm)

1-7/8" (47mm)

HOT 5-1/4" (133mm)

120V 1-3/8" (36mm)

GAS 4-7/8" (124mm)

COLD 3-1/4" (84mm)

4-3/8" (113mm)

19-3/8" (493mm)

COLD 2-7/8" (71mm)

1" (26mm)

HOT 6-1/2" (164mm)

9-1/2" (241mm)

120VAC 3-7/8" (99mm)

GAS 5-1/4" (135mm)

1-5/8" (43mm)

5" (128mm)

7-7/8" (203mm)

13-1/8" (334mm)

COLD 2-7/8" (71mm)

HOT 6-1/2" (164mm)

HOT 5-1/4" (133mm) GAS 4-7/8" (124mm)

GAS 5-1/4" (135mm)

120VAC 3-7/8" (99mm)

120VAC 1-3/8" (36mm)COLD 3-1/4" (84mm)

T-D2-IN / T-D2-OS Service Manual

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3. Interior view

T-D2-IN

T-D2-IN / T-D2-OS Service Manual

Ver. 1.00

CONFIDENTIAL

T-D2-IN / T-D2-OS Service Manual

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4. List of main components in the interior view

No.

Description Items# in

components

diagram

Takagi

Part# Common parts

forothermodels

1 Case assembly 001 EK402 (T-D2-IN)

EKK41 (T-D2-OS) T-K3OS

2 Manifold assembly with

gas valve assembly 102 EKH6T (LP model)

T-H2-DV/OS

EKK5K (NA model)

3 Computerboard 701 EK439

4 Igniter 711 EKN74 T-K3, T-K3-Pro, T-K3-SP/OS,

T-H2-DV/OS , T-KJr2-IN/OS,

T-K4-IN/OS, T-M50, T-M32

5 Transformer 702 EKH09 T-K3, T-K3-Pro, T-K3-SP/OS,

6 Waterinlet 404 EKK1U T-K3,T-K3-Pro, T-K3-SP/OS,

T-KJr2-IN/OS, T-K4-IN/OS

7 Water outlet 409 EKK1V T-K3, T-K3-Pro, T-K3-SP/OS,

T-KJr2-IN/OS, T-K4-IN/OS

8 Inletthermistor 407 EKK38 T-K3, T-K3-Pro, T-H2-DV/OS ,

T-M50, T-M32

9 Mixing thermistor 408 EKK1A T-K3, Pro, T-M50

Overheatcut-off fuse 413 EK333 T-K3, T-K3-Pro, T-K3-SP/OS,

T-KJr2-IN/OS, T-K4-IN/OS,

T-M50

Burnerassembly

(Burners)

101 EKH5W T-H2-DV/OS

Hi-limit switch 412 EKN34 T-K3,T-K3-Pro, T-K3-SP/OS,

T-H2-DV/OS , T-M50, T-M32

Fan motor 103 EKK25 (T-D2-IN) T-K3, T-K3-Pro, T-K3-SP,

T-H2-DV/OS , T-M50, T-M32

EKK54 (T-D2-OS) T-K3-OS, T-K4-OS

Freeze protection

thermostat 713 EKJ59 (T-D2-IN) T-K3, T-K3-Pro, T-K3-SP,

T-M32

710 EKK40 (T-D2-OS) T-K3-OS, T-KJr2-OS, T-K4-OS

T-D2-IN / T-D2-OS Service Manual

Ver. 1.00

CONFIDENTIAL

No.

Description Items# in

components

diagram

Takagi

Part# Common parts

forother models

Flow sensor 402 EK438

Heatexchanger assembly

401 TU002 (T-D2-IN)

EK437 (T-D2-OS)

Gas inlet 118 EKK1E T-K3,T-K3-Pro, T-K3-SP/OS,

T-KJr2-IN/OS,T-K4-IN/OS,

T-H2-DV/OS

Heater 414 EKK2R T-K3, T-K3-Pro,T-K3-SP/OS,

T-KJr2-IN/OS, T-K4-IN/OS

Flow adjustmentvalve 402 EK438

Surge box 703 EK428 T-KJr2-IN/OS, T-K4-IN/OS

Outlet drain plug 410 EKK2E T-K3,T-K3-Pro, T-K3-SP/OS,

T-KJr2-IN/OS,T-K4-IN/OS,

M50

Air-fuel ratio rod

(AFR rod) 108 EKK0E T-K3, T-K3-Pro, T-K3-SP/OS,

T-H2-DV/OS, T-M50,T-M32

Flame rod 108 EKK0E T-K3,T-K3-Pro, T-K3-SP/OS,

T-H2-DV/OS, T-M50,T-M32

Igniterrod 109 EKK0F T-K3, T-K3-Pro, T-K3-SP/OS,

T-H2-DV/OS, T-M50,T-M32

Inletdrain plug (water

filter) 405 EKK2B T-K3, T-K3-Pro,T-K3-SP/OS,

T-KJr2-IN/OS, T-K4-IN/OS

120 VAC PowerON-OFF

switch 706 EKK4V T-K3-SP/OS, T-KJr2-IN/OS,

T-K4-IN/OS,T-H2-DV/OS

Gas valve assembly Included in #102

EKH6T (LP model)

T-H2-DV/OS

EKK5K (NA model)

Manifold port N/A N/A

Gas inlet port N/A N/A

Exhaust chamber Included in #401

TU002 (T-D2-IN) T-H2-DV/OS

EK437 (T-D2-OS)

Output thermistor 411 EKK2T

Bypass valve 403 EKK0U

T-D2-IN / T-D2-OS Service Manual

Ver. 1.00

CONFIDENTIAL

5. Schematic diagram

The diagram below refers to both the T-D2-IN and T-D2-OS.

1. When a hot water tap is opened,cold water entersthe T-D2-INor T-D2-OS.

2. The water flow sensor detects this waterflowand sends this information tocomputer.

3. The computer initiatesfan motorand sends signal to igniter to create ignition spark.

4. The main, proportional, and solenoid gas valves open to allow gas input.

5. The gas ignites and flames appear inside the burner chamber.

6. Watercirculates through the heat exchanger and isheated up tothe settemperature.

7. Using thermistors to measure temperatures, the computer modulates the gas and water valves to

ensureproperoutput water temperatures.

8. When the tap is closed, the T-D2-IN or T-D2-OS shuts down.

PCB

Hi-limit SW

Inlet drain

plug filter

Mixing

Thermistor

Drain plug

Main gas valve

Gas solenoid valve 2

Fan motor

Flame rod

Igniter rod

Igniter

O.H.C.F

Heater

Flow adjustment valve

with Flow sensor

Gas proportional valve

Gas solenoid valve 1

Air-fuel ratio rod

Gas solenoid valve 3

Output

Thermistor

Bypass valve

Inlet

Thermistor Transformer

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