Hubbell ETXA Series, Описание, установка и руководство по эксплуатации, Страница: 38 / 52

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Check the Flow Meter:
1. Set the unit to diagnostic mode by pressing and releasing the UP and DOWN buttons
simultaneously.
2. Turn on a hot water tap at a fixture that will ensure a good flow rate through the unit.
3. If the flow rate on the display reads ‘F00.0’ then continue with the next step.
Otherwise, proceed to Check the Temperature Controller.
4. Verify that the wiring from the flow switch is connected to the control board in the
order
WHITE / GREEN / BROWN from left to right on pin
block JP6.
5. With no flow on the unit, using the multi-meter probes with
the setting at Volts – Direct Current, place one probe on the
terminal block where the
WHITE wire is connected (F1
Left) and the other probe where the BROWN wire is
connected (F3 Right). A voltage reading in the appropriate
range (9V) should be indicated.
6. If the voltage reading is not in the appropriate range (9V),
replace the temperature controller.
7. Turn on a hot water tap at a fixture that will ensure a good
flow rate through the unit and using the multi-meter probes
with the setting at Volts – Direct Current, place one probe
on the terminal block where the
WHITE wire is connected
(F1 Left) and the other probe where the GREEN wire is
connected (F2 Middle). A voltage reading in the appropriate
range (4.5V) should be indicated.
8. If the voltage reading is not in the appropriate range
(4.5V), replace the flow meter.
9. If all voltage readings are acceptable, proceed to Check the Temperature Controller.
Check the Temperature Controller: TK2000 Control Board
1. With no flow to the heater.
2. At the top of the temperature controller there are 4 sets of terminal blocks for the
TK2000 control board, verify the wiring is correct as indicated in the wiring diagram
specific to your heater model.
3. Check the voltage on the 2 connections labeled “A” and “B” on terminal block JP3 in the
upper left hand side of the board. A voltage reading in the appropriate range (208-240V)
should be indicated.
3.
If no voltage is present, verify that the wires connected in the terminal blocks are
properly tightened and verify that the opposite end, is properly connected to the power
distribution block, magnetic contactor, or transformer, as applicable. Also check the
control fuse located next to the control board.
4. If voltage is present where the black wires connect to the terminals and there is no
display, replace the temperature controller.
5. Check the voltage between each additional pair of terminals labeled T2, T3 and T4. A
voltage reading in the appropriate range of the incoming power voltage should be
indicated. (i.e. if the incoming power is 480V, then the reading should be 480V across
the pair)
6. If no voltage is present, verify that the BLACK jumper wires in the terminal block labeled
B2, B3 and B4 are properly tightened and verify that the opposite ends of the BLACK
wires are properly jumped to the previous BLACK wire connection terminal or properly
connected the magnetic contactor, as per the unit wiring diagram.
WHITE
GREEN
BROWN