T-K3 Service Manual
Ver. 1.05
31
CONFIDENTIAL
10-19. Freeze protection thermostat
T-K3 Part #
#705
Takagi Part #
EKJ59
Checkpoint
B1
Function
Failure event
Effects on the T-K3
if the freeze
protection
thermostat fails.
Error codes when the
freeze protection
thermostat fails.
Diagnostic
Color/Number of
wires
Black - Black
(itself)
Activation and deactivation temperatures of the T-K3's freeze protection system
ON mode: 36.5
˚
F (+6.3
˚
F -2.7
˚
F)
2.5
˚
C (+3.5
˚
C -1.0
˚
C)
OFF mode: above 46.4
˚
F
above 8
˚
C
ON mode: 90 VAC - 110 VAC and less than 1
Ω
OFF mode: less than 1 VAC and more than 1M
Ω
1. Visual inspection: connection/breakage of wires and/or the body has been
broken.
2. Check resistance and voltage: proper range of values shown below.
Temperature detecting device which prevents the pipes within the T-K3 from
freezing. When this device detects temperatures below 36.5
˚
F (2.5
˚
C) inside the
T-K3, power is supplied to the electric heaters to prevent the T-K3 from freezing.
1. ON-failure (Always senses freezing temperatures, regardless of actual
temperature).
2. OFF-failure (Never senses freezing temperatures).
1. The freeze protection heaters will always be ON, causing heat damage to
components inside the T-K3.
2. The freeze protection heaters will never be able to turn on, even under freezing
temperatures, causing freeze damage to the T-K3.
N/A
7/ 8" ( 22 .2 mm )
1
-3/
8"
(
33.
5m
m)
1 /4 " ( 5 .7m m)