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below provide details on how connections to the tankless water heater control board are to be
made.
1. Priority Relay (10A@240VAC max.)
a. When the unit is demanding power:
i. The connection between the terminals marked C and NO are closed and
will allow power to pass through.
ii. The connection between the terminals marked C and NC are open and will
not allow power to pass through.
b. When the unit is not demanding power:
i. The connection between the terminals marked C and NO are open and will
not allow power to pass through.
ii. The connection between the terminals marked C and NC are closed and
will allow power to pass through.
2. Remote Control
a. When a 24VDC signal (5mA draw max.) is supplied between terminals P1 and
P2, the heater will operate or be inhibited as determined by the Remote Control
settings as shown above. Loss of 24VDC signal will have the opposite effect.
b. When wired to a volt-free contact (10A max.) between terminal P2 and P3 (output
signal 24VDC@5mA), opening or closing the contact will allow the heater to
operate or inhibit operation as determined by the Remote Control settings as
shown above.
TK2000 Control Board Wiring Detail
Outlet
Thermistor
Inlet
Thermistor
Leak
Detection
F1 F2 F3
Flow
Mete
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