Takagi T-K3 - Gas Valve Assembly

T-K3 Service Manual
Ver. 1.05
16
CONFI DENTIAL
10-4. Gas valve assembly
T-K3 Part # #105 Takagi Part # EKK1W Checkpoint C,H1
F ailure events
Effects on the T-K3
if valves fails.
Error codes when
the valves fail.
111 121 510 701 711
D iagnostic
DC 78~100V / 0.9~1.7K
Ω
DC 78~100V / 0.9~1.3KΩ
DC 78~100V / 1.3~1.9K
Ω
DC 78~100V / 1.3~1.9K
Ω
D C 1~15V / 20~4 0Ω
Blue -Green
1. Visual inspection: connection/breakage of wires.
2. Listen for "clunk" sounds from the gas valves opening right after fan motor
initiates.
3. Check voltages an d resistance of c oils; pr oper r ange of values sh own below.
Blue -light blue
Blue -Orange
1. Gas leak from the unit.
2. Excess carbon monoxide emissions.
3. Lack of water tem perature control .
4. No flames
Blue -Red
Modulates the gas flow from the gas inlet (proportional gas valve)
Function
Opens and closes the gas pathways of the T-K3 (main and solenoid gas valves)
1. Gas leak from the valves.
2. Unab le to open/close (m ai n and so lenoi d gas valves)
3. Unable to modulate the gas flow (proportional gas valve)
Color/Number of
wires
White - Red (Proportional Valve
)
3-5/ 8" (91 .5m m)
1-3 /8 " (34mm)
2-5/8" (67mm)
Proportional valve
Main gas v al ve
Gas
valve
4-1/4" ( 10 8m m) 7/8" (22.2mm)
4-5/8" ( 119 mm )
Solenoid valve
Proportional Valve