Takagi T-K3 Service Manual page 61

To sum it up in a chart:
5 minutes have
elapsed since prior
operation?
No
Yes
Yes
Yes
Yes
Outdoor installation:
After 25 minutes have elapsed since the T-K3's previous firing operation, the computer w ill
continually check the temperatures of the inlet and outlet ther mistors. The automatic firing
system w ill not activate at all unless these 25 minutes have elapsed.
When the computer checks for these temperatures, the freeze protection firing system w ill
activate if:
T ≤ 37°F and T ≤ 43°F
in out
where T is the temperature of inlet thermistor and T
in
To sum it up in a chart:
25 minutes have
elapsed since prior
operation?
No
Yes
Yes
Yes
Yes
Inlet ther mistor Outlet
temperature temperature
Any Any
Above 39°F Any
Any Above 50°F
39°F and below 50°F and below
Any 37°F and below
OR
Inlet ther mistor Outlet
temperature temperature
Any Any
Above 37°F Any
Any Above 43°F
37°F and below 43°F and below
Any 37°F and below
ther mistor Will automatic firing
be activated?
NO
NO
NO
YES
YES
T ≤ 37°F
out
is the temperature of the outlet ther mistor.
out
ther mistor
61
CONFIDENTIAL
T-K3 Servi c e Manual
Ver. 1.05
Will automatic firing
be activated?
NO
NO
NO
YES
YES