A.O. Smith T-M50 ASME Bedienungsanleitung

T-M50 / T-M50 ASME Service manual

Ver. 1.05

CONFIDENTIAL

T-M50 / T-M50 ASME

On-Demand Water Heater

Service manual

T-M50

A.O. Smith Water Products Company

500 Tennessee Waltz Parkway

Ashland City, TN 37015

Toll Free: 1

877

737

2840

T-M50 / T-M50 ASME Service manual

Ver. 1.05

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.

Fault Analysis & Specifications……………………………………………………………........................

12.

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

13.

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

14.

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

15.

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

T-M50 / T-M50 ASME Service manual

Ver. 1.05

CONFIDENTIAL

1. Specifications

Unit Model T-M50 / T-M50 ASME

Unit dimensions H25.3"×W24.8"×D11.8"

Weight 102 lbs.

Max 380,000

INPUT

BTU/h

Min 15,000

Combustion System

Power vent

Installation Indoor, Outdoor, Direct vent

Fan motor PWM Turbo fan

Max LP 3.7”WC

Natural 2.7”WC

Combustion

Manifold

Pressure*

Min LP 0.9”WC

Natural 0.7”WC

Flow rate 0.5 to 14.5 GPM

Available set temp.

100°F to 185°F

default set 120°F

Temperature

dipswitch setting

100°F, 115°F, 120°F, 135°F, 145°F, 155°F, 165°F, 185°F

Bypass valve Yes

Water control

Thermistors 3 thermistors (In, Out, Mixing)

Available remote

controller TM-RE30

PCB Model Central board: MC50 (Part # EM306) /

Right and left computer board:T-M50 (Part # EM307)

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

Operation

Power supply

control GFI (Excluding surge absorber)

Freeze protection

Ceramic heaters, Auto-FM system and Auto-firing system

Self-combustion

improvement Air Fuel Ratio detection system

Easy-link system

Yes

Future

Multi-unit system

Yes

*The manifold pressure measurement is base on conditions without front cover.

T-M50 / T-M50 ASME Service manual

Ver. 1.05

CONFIDENTIAL

5" (1 27mm)

24-7/ 8" (632 .9mm)

25-1 /4" (64 2m m)

7-3/8 " (18 6m m) GAS

1-5/ 8" (40mm) C OLD

12-1 /4 " (311 .5mm)

4-7/8" (12 2.9mm)

1/2" (11.9m m)

5-3/8" (137.3 mm) HO T

4-3/ 8" (11 0.8mm) GA S

7-5/8" (194.3 mm) C OLD

4" ( 100mm) 1 20 VAC

6-3/ 4" (171 .3mm) 12 0 VAC

1/2" (12.5 mm)

2-1/ 2" (62.1m m)

5-7/ 8" (15 0mm ) HOT

15" (381mm )

8" ( 203mm)

29-7/8 " (7 59 mm)

GAS

COLD

HOT

7-3/8 " (18 6m m)

4" ( 100mm)

4-3/8" (110.8 mm)

6-3/8" (17 1.3mm)

1-5/8" (40mm)

5-7/ 8" (15 0m m)

6-3/4 " (137.3mm)

7-5/8" (19 4.3mm)

4-7/ 8" (123.7mm)

8" ( 203.2m m)

2. Exterior view

Side view Front view

Top view Bottom view

T-M50 / T-M50 ASME Service manual

Ver. 1.05

CONFIDENTIAL

3. Interior view

4 4

2122 23

24 25

T-M50 / T-M50 ASME Service manual

Ver. 1.05

CONFIDENTIAL

4. List of main components in the interior view

No. Description

Items# in

components

diagram

Takagi

Part #

Common parts

For other models

1 Case assembly 001 EM305

2 Burner assembly (Burners) 101 EM445

3 Igniter 102 EKN74

T-K3, T-K3-Pro, T-K3-SP/OS,

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

T-K4-IN/OS, T-D2-IN/OS,

T-M32

EM302

(LP model)

4 Manifold assembly with gas

valve assembly 114

EM303

(NA model)

5 Fan motor 416 EKK25

T-K3, T-K3-Pro, T-K3-SP,

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

T-D2-IN/OS,T-M32

6 Flame rod 103 EKK0E

T-K3, T-K3-Pro, T-K3-SP/OS,

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

T-D2-IN/OS, T-M32

7 AFR rod 103 EKK0E

T-K3, T-K3-Pro, T-K3-SP/OS,

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

T-D2-IN/OS, T-M32

8 Igniter rod 104 EKK0F

T-K3, T-K3-Pro, T-K3-SP/OS,

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

T-D2-IN/OS, T-M32

9 Gas inlet 124 EM284

401 EM308

(Regular model)

10 Heat exchanger

444 EM323

(ASME model)

11 Exhaust combining box 128 EM331

T-M50 / T-M50 ASME Service manual

Ver. 1.05

CONFIDENTIAL

No. Description

Items# in

components

diagram

Takagi

Part #

Common parts

For other models

12 Water control valve 418 EKH32 T-H2-DV/OS, T-M32

13 Water inlet 434 EM295

14 Water outlet 439 EM309

15 Inlet thermistor 424 EKK38 T-K3, T-K3-Pro, T-H2-DV/OS,

T-D2-IN/OS, T-M32

16 Output thermistor 405 EKK2T T-K3, T-K3-Pro, T-H2-DV/OS,

T-D2-IN/OS, T-M32

17 Mixing thermistor 430 EKK1A T-K3, T-K3-Pro, T-D2-IN/OS

18 Hi-limit switch 403 EKN34

T-K3, T-K3-Pro, T-K3-SP/OS,

T-H2-DV/OS, T-D2-IN/OS,

T-M32

19 Overheat cut-off fuse 402 EK333

T-K3, T-K3-Pro, T-K3-SP/OS,

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

T-D2-IN/OS

20 Heater101 426 EX002 T-D2-IN/OS, T-M32

21 Inlet drain plug (water filter) 437 EX006 T-H2-DV/OS, T-M32

22 Outlet drain plug 442 EKK2E

T-K3, T-K3-Pro, T-K3-SP/OS,

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

T-D2-IN/OS

23 Left / Right computer board 701 EM306

24 Central computer board 702 EM307

25 Transformer 718 EM296 T-H2-DV/OS

26 GFl 720 EM207 T-M32

27 Freeze protection thermostat

140 EM286

28 Heater 502 425 EX001

29 Surge box 722 EM385 T-M32

30 Manifold port N/A N/A

31 Gas inlet port N/A N/A

T-M50 / T-M50 ASME Service manual

Ver. 1.05

CONFIDENTIAL

5. Schematic diagram

1. When a hot water tap is opened, cold water enters the T-M50.

2. The water flow sensor detects this water flow and sends this information to computer.

3. The computer initiates fan motor and 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. Water circulates through the heat exchanger and is heated up to the set temperature.

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

ensure proper output water temperatures.

8. When the tap is closed, the T-M50 shuts down.

Heat

Exchanger

Output

Thermistor

Water

control

valve

Flow sensor

Mixing

Thermistor

Exhaust Output

Thermistor Heat Exchanger

Water control

vale

Flow sensor

Inlet

Thermistor

Computer board

Burner

Gas valve

Fan motor

Hot water

outlet

Cold water

inlet

Gas

Inlet

Thermistor

120 VAC

T-M50 / T-M50 ASME Service manual

Ver. 1.05

CONFIDENTIAL

6. Wiring diagram

BK:BLACK

P:PURPLE

LB:LIGHT BLUE

BL:BLUE

G;GREEN

Y:YELLOW

O:ORANGE

BR:BROWN

Heater

Thermostat

Inlet

thermistor

Output

thermistor

Mixing

thermistor

GFI

Tra n s-

for m er

12 3 4 5 6

O F F

120 VAC

10A

Ground

BK BR

Ground

Air-fuel

ratio rod

Ground

Flame

rod

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

SV1

SV2

SV3

Remote

controller

Parent

Ground

Inlet

thermistor

Output

thermistor

Mixing

thermistor

12 3 4 5 6

O F F

Air-fuel

ratio rod

Ground

Flame

rod

SV1

SV2

SV3

Igniter

rod

Heater

RYGWBK

ROYGW

RYGW

ROYGW

Water

Control

valve

Water

Control

valve

B K

BK B K

WR B K

WR B K R

WBK

Gas

Porpor-

tional

Valve

Flow

Sensor

WR BK

WR BK R

Hi-

limit

O.H.C.F

BL BL

Hi-

limit

O.H.C.F

BL B L

Flow

Sensor

Left side unit Right side unit

Surge

box

MAX button

MIN button

Increase button

Decrease button

Burning lamp

Communication

lamp (right)

Communication

lamp (left)

Multi-system

on line lamp

Lower bank of

dipswitches

Upper bank of

dipswitches

7 Seg LED

Pump test run

Error call

button

Burning lamp

port

Pump

port

Button to check

unit number

Priority SW

Alarm

contact

Draft switch

Dipswitches

MAX button

MIN button

Increase button

Decrease button

Dipswitches

Gas

Porpor-

tional

Valve

Igniter

rod

A A

G G

TM-RE30

T-M50 / T-M50 ASME Service manual

Ver. 1.05

CONFIDENTIAL

7. Wiring diagram check points for diagnosis

Check-

point

Parts and Description

Color of wires Normal Range

A1 100 V Power supply White –Black (A)

Brown –Brown (A1) 90 to 110 VAC

A2,A3

120 V Power supply Black - White 108 to 132 VAC

B Igniter Purple –Purple 90 to 110 VAC

Light blue - blue at COM (MV)

78 to 100 VDC (during operation)

/ 0.9 to 1.3 kΩ

Green - blue at COM (SV1) 78 to 100 VDC (during operation)

/ 1.3 to 1.9 kΩ

Orange - blue at COM (SV2) 78 to 100 VDC (during operation)

/ 1.3 to 1.9 kΩ

C Gas valves

Red - blue at COM (SV3) 78 to 100 VDC (during operation)

/ 0.9 to 1.7 kΩ

C1 Hi-Limit switch Blue - Blue

Less than 1 VDC

and

Less than 1 Ω

C2 Overheat cutoff fuse Blue - Blue

Less than 1 VDC

and

Less than 1 Ω

D1 White - White 15 VDC

Easy-link and

Multi-unit link

connectors

Black –Blue

Black –Red

15 VDC

(during Easy-link operation)

E1 Mixing thermistor Black - Black

E2 Output thermistor Black - Black

E3 Inlet thermistor Black - Black

See table on p.12

F Remote controller Black - White 11 to 25 VDC

Red - Blue 110 to 160 VDC

Yellow - Blue 13 to 17 VDC

G Fan motor

Orange - Blue 2 to 6.5 VDC

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