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T-H3-DV
Takagi T-H3-DV Service Handbook
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COMPONENTS
On-Demand W
ater Heat
er Ser
vice Handbook for 240, 340 & 540 Condensing Models •
71
COMPONENT
DIAGRAMS
/
ITEM
NUMBERS
Indoor
model
Outdoor
model
Case assembly
052
052
003
007
002
050
006
704
005
052
702
704
008
052
050
052
717
702
713
004
002
001
001
004
Temperature
remote controller
724
723
722
056
Temperature controller
Indoor
model
722
722
722
722
70
72
Table of Contents
Default Chapter
2
Table of Contents
2
Specifications
4
Introduction
5
General Installation Guidelines
5
Normal Operation
6
Activation
6
Operation
6
Shutdown
6
Troubleshooting
7
Preliminary Checklist
7
Gas/Water/Electric
7
Remote Controller
7
High Altitude
7
Long Vent Run
7
Hard Water
7
New Installations
7
External Problem
7
Next Step
8
General Issues
8
Water Is Not Hot Enough
8
Water Is too Hot
8
Temperature Fluctuates When a Fixture Is Opened
9
Unit Does Not Ignite When Water Goes through It
10
Abnormal Sounds Come from the Unit
10
Error Codes
11
Code 031: Incorrect DIP Switch Settings
14
Code 101: Abnormal Combustion
14
Code 111 or 121: Ignition Failure / Flame Loss
14
Code 311, 321, 331 or 341: Thermistor Failure
16
Code 391: Air-Fuel Ratio Rod Failure
17
Code 441: Flow Sensor Failure (Easy-Link or Multi-Link System Only)
17
Code 510: Abnormal Main Gas Solenoid Valve (MV)
17
Code 551: Abnormal Solenoid Gas Valve (SV1, SV2, And/Or SV3)
18
Code 611: Abnormal Fan Motor
18
Code 651: Flow Adjustment Valve Fault (Easy-Link or Multi-Link System Only)
18
Code 661: Bypass Valve Fault (540 (T-H3) Model Only)
19
Code 701: Computer Board Fault / Proportional Gas Valve Fault
19
Code 711: High Limit Switch / Overheat Cutoff Fuse Circuit Is Compromised
19
Code 721: False Flame Detection
20
Code 741: Remote Control Problem
20
Code 751: Temperature Controller Problem
20
Code 761: Communication Error in Easy-Link or Multi-Link System
20
Code 941: Abnormal Exhaust Temperature
21
Code 991: Abnormal Combustion
21
Dip Switch Settings
23
High Altitude Settings
26
Wiring Diagrams
30
Service Procedures
32
Unit Draining and Filter Cleaning
32
Checking for a Crossed Connection
33
Checking for a Reversed Connection
33
Checking the Inlet Gas Pressure and Pressure Drop
33
Checking and Adjusting the Manifold Gas Pressure
34
Checking the Manifold Gas Pressure
34
Adjusting Maximum Manifold Pressure
35
Adjusting Minimum Manifold Pressure
35
Checking the Overheat Cutoff Fuse (OHCF)
35
Checking the Flow Sensor
36
Cleaning the Rod Assembly (Flame Sensor and Air/Fuel Ratio Rod)
36
Descaling the Unit
38
Cleaning the Combustion Components
39
Easy-Link Connections with Previous Models (540 [T-H3] Only)
43
DIP Switch Setting on the 540 (T-H3) Computer Board
43
Temperature Settings
44
Diagnostic Mode
45
Individual Unit
45
Multiple Units in a Linked System (540 [T-H3] Models Only)
45
Maintenance
49
Flow Sensor/Control Valve Removal and Installation
51
Removal
51
Installation
51
Burner Removal and Installation
52
Burner Removal
52
Burner Installation
54
Gas Valve/Manifold Plate: Removal and Installation
55
Gas Valve/Manifold Plate Removal
56
Gas Valve/Manifold Plate Installation
57
Replacing the Heat Exchanger
60
Preparing the New PRIMARY Heat Exchanger for Installation
65
Preparing the New SECONDARY Heat Exchanger for Installation
65
Installing the Heat Exchanger Assembly
66
Restarting the Unit
70
Component Diagrams/Item Numbers
71
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Installation Manual And Owner's Guide
64 pages
5
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Takagi T-H3-DV Specifications
General
Brand
Takagi
Model
T-H3-DV
Category
Water Heater
Language
English
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