Aerco Benchmark G-00-711, Руководство пользователя

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TROUBLESHOOTING
8-3
Note: The procedures in step 4 test and
ensure the integrity of wiring inside and
outside of the control panel as well as the
connections of the control box connectors.
5. If there is no continuity, check for loose
connectors at the switch end of the wires.
Check the pins in the 1” diameter connector
on the bottom of the control box for proper
insertion and/or signs of wear.
8.3 LOW WATER LEVEL
A LOW WATER LEVEL message indicates that
water level in the unit is too low. Check that the
shut-off valves on the supply and return of the
unit are open and that there is water in the shell.
(Momentarily opening the relief valve and
looking for a strong flow of water will verify that
there is sufficient water level). If there is
sufficient water level, try to reset the unit by
pressing the low water level reset button and the
Annunciator clear button. If the unit fires but the
message will not clear, replace the Annunciator.
If the unit does not fire and the message will not
clear check the following.
8.2.1 Water Level Probe
8.2.2 Wiring & Connections
8.2.3 Water level Circuit
Recommended Troubleshooting Equipment
•
Digital Volt/Ohmmeter (DVM)
8.3.1 WATER LEVEL PROBE
1. Disconnect the electric power to the unit.
2. Remove the unit side and top panels and
remove wire #138 from the water level
probe.
WARNING!
THIS WIRE HAS A POTENTIAL OF 12
VAC. BE SURE TO REMOVE POWER
FROM THE UNIT BEFORE
DISCONNECTING OR HANDLING THE
WIRE.
3. Connect an AC voltmeter between wire
#138 and the unit frame.
4. Reapply AC power to the unit. The AC
voltmeter should read approximately 120
VAC. If approximately 120 VAC is not read
on the AC voltmeter, proceed to section
8.3.2.
5. If 120 VAC is read on the AC voltmeter,
disconnect power to the unit and ground the
probe to the unit shell.
6. Reconnect AC power to the unit. If the fault
still does not clear, proceed to section 8.3.2.
If the fault clears
,
replace the probe.
8.3.2 WIRING AND CONNECTIONS
1. Disconnect AC power to the unit.
2. Remove the unit side and top panels
disconnect wire #138 from the water level
probe and unplug the one ¾" connector
from the control box.
3. Referring to system schematic 161453 in
Appendix H, locate wire #138.
4. Using an ohmmeter check wire #138 for
continuity
5. If wire #138 does not have continuity, repair
as necessary.
6. If wire #138 has continuity, check the probe
end of the wire for a loose connector.
7. Check the pin in the 1 ¾" connector for
proper insertion or signs of wear.
8. If the connector and pin are okay, reconnect
wire #138 to the water level probe.
9. Reconnect the 1 ¾" connector to the control
panel.
10. Reconnect electric power to the unit. If the
water level fault still does not clear, see
Section 8.3.2.
8.3.3 WATER LEVEL CIRCUIT
1. Remove AC power from the unit.
2. Open the control box to expose the wiring
and internal components.
WARNING!
THE WIRES AND COMPONENTS IN THE
CONTROL PANEL USE 120VAC POWER.
DO NOT TOUCH ANY WIRES OR
COMPONENTS IN THE CONTROL BOX
WITH POWER APPLIED
.
3. Remove wires #114 and #60 from terminals
LLCO and G.
4. Using an ohmmeter, check continuity
between wire #114 in the control box, and