Hubbell JHX, Инструкция по установке, эксплуатации и обслуживанию, Страница: 27 / 44

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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. LEA H2O, indicates that water has been detected in the case
Remote Display
An optional remote display may be supplied and connected to the TK2000 control board 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 booster heater over that device to ensure that
both do not operate at the same time and/or the tankless booster 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 booster heater to be remotely controlled. The diagram and
description below provide details on how connections to the tankless booster 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 H1d) 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.