T-K3 Service Manual
Ver. 1.05
26
CONFI DENTIAL
10-14. Freeze protection heaters
T-K3 Part #
#412
#418(Inl et)
Takagi Part #
EKK2R
EKK2P(Inlet)
C heckpo int
B1
Function
F ailure event
Effects on the T-K3
if heaters fail.
Error codes when
heaters fail.
D iagnostic
Color/Number of
wires
White - White
Prevents the heat exchanger, water valves, and water pipes within the T-K3 from
freezing. The heater s ar e but one of the fr ee ze pr otec tion devices in the T-K3.
Open cir cuit fai lure : ceramic h ea ters do not receive the vol tage needed to heat
up.
Ceramic heaters do not activate, allowing water contained in the heat exchanger
to freeze up, possibly causing the heat exchanger to burst.
The T-K3 has two types of the heaters in it. The one is for protecting of the heat
exchanger and the outlet pipe, the other one is for protecting of the inlet pipe.
N/A
AC 90~110V (during operation)
1. Visual inspection: connection/breakage of wires and the condition of the
heaters.
2. Check: whether those are in the normal range as shown in the following table.
Heater
Inlet Heater
For the heat exchanger
For the outlet pipe
For the inlet pipe
4-3/8" (110mm
j
2-3/4" (70mm )
3-1/2" (90mm)
13" (33 0mm)
1" (25mm)
3/8" (10mm)
7-1/8" (180mm)
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