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Model ERCH-HP Energy Recovery Unit
Troubleshooting - Controller Alarms
The first step in troubleshooting the unit is to check
the on-board alarm indicators. Several of the electronic
controls in the unit monitor the system for faults and will
go into alarm, shutting down the unit or a single function
within the unit.
DDC Controller
Check the screen on the DDC for an alarm condition. If
the DDC is
in an alarm
condition, a
message will
show on the
DDC screen.
The DDC is located in the main control center. If the
DDC is in alarm condition, the alarm button will blink
red. Press the alarm button to see the specific condition
or to reset the DDC. Refer to the DDC Installation
Operations and Maintenance manual for detailed
information on fault codes and see the unit-specific
wiring diagram.
Phase Monitor
The phase monitor has two
LED indicator lights, one
red and one green. Green
indicates proper operational
status, red indicates the unit
has detected a fault and is in
alarm condition.
Variable Frequency Drive (VFD)
Variable frequency drives have a
display screen that will show an
alarm condition. If a fault such
as a voltage spike occurs, the
VFD will go into alarm and will
not reset until a hard restart is
performed. See the unit-specific
manufacturer’s manual supplied
with the unit. VFDs are located in
the main control center.
FX05 Furnace Controller
Present only if an indirect gas-fired furnace option is
present.
The FX05 furnace controller will display an alarm
condition if present. The controller will be found in the
furnace control cneter. See the
furnace installation, operation
and maintenance manual and
the controller manufacturer’s
unit-specific manul for further
information.