Hubbell ETXA Series, Описание, установка и руководство по эксплуатации, Страница: 31 / 52

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a. To enter a specific cost per kW∙Hr value, while displaying the Cost
Calculator values above press and release the UP and DOWN buttons
simultaneously.
v. The display shows the cost per kW∙Hr as #.### (Factory Default 0.114)
vi. Press the UP or DOWN button to adjust the cost per kW∙Hr. Holding
the UP or DOWN buttons will fast scroll.
vii. Press the UP and DOWN buttons simultaneously to lock in the cost
per kW∙Hr.
viii. Press the UP or DOWN button to return to Cost Calculator values.
ix. Press the UP or DOWN button to return to normal display mode.
7. Error Code
a. Err1, Future use.
b. Err2, Future use.
c. Err3, Future use.
d. Err4, Future use.
e. Err5, indicates a failure of the inlet thermistor.
f. Err6, indicates a failure of the outlet thermistor.
g. Err7, indicates a failure of the display unit to communicate with the main board.
h. Err8, indicates that water has been detected in the case.
i. Err9, indicates a problem with the flow meter.
Remote Display:
A remote display is supplied and connected to the TK2000 and the TK2250 control board on
pin JP11 as shown below.
Priority and Remote Controls:
Optionally, the tankless water heater may be connected to another electrical device (10A
@240VAC max.) that will give priority to the water heater over that device to ensure that both
do not operate at the same time and/or the tankless water heater may be wired to a remote
switch, relay, or provided with a 24VDC signal (such as from a building maintenance system)
to allow the tankless water heater to be remotely controlled. The diagram and description
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 (calling for heat):
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 (not calling for heat):
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 either operate or be inhibited (displayed as hLd) as determined
by the Remote Control settings as shown above. Loss of 24VDC signal has 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 either operate or inhibit (displayed as hLd)
operation as determined by the Remote Control settings as
shown above.