Takagi T-K3 Service Manual

T-K3 Service Manual
Ver. 1.05
25
CONFI DENTIAL
10-13. Overheat cutoff fuse
T-K3 Part # #411 Takagi Part # EKK0S Checkpoint C2
Function
Failure event
Effects on the T-K3
if the overheat cutoff
fuse fails.
Error codes when
the fuse fails.
111 121
D iagnostic
Color/Number of
wires
Bl ue -Blue
Solder will melt at temperatures exceeding 365
˚
F (
±
9
˚
F) or 185
˚
C (±5
˚
C)
Less than 1Ω
-The overheat cutoff fuse contains solder with a melting point of 365
˚
F (185
˚
C).
-Detects excessive te mpera tur es withi n the T -K3, especially ar ound th e he at
exchanger and combustion chamber. Upon detection, communication between
the computer board and gas valves will sever, shutting down the T-K3 instantly.
The "111" or "1 21 " e rro r code will display.
1. Unable to detect the excessively high temperatures within the T-K3.
1. Flames from burne r m ay penetrate a ruptur ed/dam aged heat exchanger.
2. Gas valves will not operate.
1. Visual inspection: connection/breakage of wires.
2. Check voltages an d resistance: p roper range of values sh own below.
27-1/2" (700mm)

Takagi T-K3 Specifications

General

Type	Tankless
Installation Type	Indoor
Maximum BTU Input	199, 000 BTU/h
Gas Connection Size	3/4"
Vent Size	3"
Hot Water Flow Rate (at 35°C rise)	6.6 GPM
Maximum Input	199, 000 BTU/h