Takagi T-K3 Service Manual

T-K3 Service Manual
Ver. 1.05
31
CONFI DENTIAL
10-19. Freeze protection thermostat
T-K3 Part #
#705
Takagi Part #
EKJ59
C heckpo int
B1
Function
Failure event
Effects on the T-K3
if the freeze
protection
thermostat fails.
Error codes when the
freeze protection
thermostat fails.
D iagnostic
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 m ode: above 46.4˚Fabove 8˚C
ON mo de : 90 VAC - 110 VAC and less than 1Ω
OFF mode: less than 1 VAC and more than 1MΩ
1. Visual inspection: connection/breakage of wires and/or the body has been
brok en .
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-fa ilure ( Never senses fr eezing temp er atu res) .
1. The freeze protection heaters will always be ON, causing heat damage to
compon en ts 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 .2mm)
1-3/8" ( 33.5mm)
1/4" (5.7mm)

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