Takagi T-K3 Service Manual

T-K3 Service Manual
Ver. 1.05
22
CONFI DENTIAL
10-10. Bypass valve
T-K3 Part # #403 Takagi Part # EKK0 U Checkpoint J2
Failure event
Effects on the T-K3
if the bypass valve
fails
Error codes when
b
y
pass valve fails.
D iagnostic
Color/Number of
wires
Red - Black
The physical appearance of the bypass valve is similar to that of the flow adjustment
valve. However, their functions differ and cannot be substituted for each other.
DC7~16V and 0.09~0.2kΩ
2. Keep s the water temper atur e in the heat e xcha ng er stable, preve nting low-
temperature corrosion by reducing condensation buildup in heat exchanger.
Function
1. Mixes hot water from the heat exchanger with cold water from the water inlet in
or de r to modulate a nd co ntrol the T-K3's outlet water temperature.
1. Vi sual i nspection: conn ection/breakage of wires.
2. Check voltages a nd r esistance: pr oper rang e of val ues shown below.
1. W ater leakage from valve.
2. The valve cannot modu late or mak e open/cl ose positions.
1. W ater leakage from failed valve ca n d am age othe r T-K3 compone nts
2. Temperature fluctuations in th e ho t wate r outpu t.
N/A
>PPE-GF<
1- 7/ 8" (4 7m m)
3- 3/8 " (84 .4 mm)
2 -5/ 8" ( 67 .5 mm )
BYPASS
WATER IN
BYPASS
WATER OUT
Bypass
valve
BYPASS
WATER IN
BYPASS
WATER OUT

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