Compu-aire CAG-30 Series, Инструкция по установке и эксплуатации

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not set as expected. check that all
parameters are set
correctly.
Compressor is not
running because of high
or low pressure failure.
Display shows
compressor failure
alarm. Alarm LED is on.
Determine cause of high
or low pressure failure
and remedy. Press
Reset button on MCP.
Complaint Problem Symptom Action
Compressor is not
running because of
loose or broken wiring.
Display shows DX
cooling is on and there
are no compressor
failure alarms.
Test for 24VAC at pin 17
and 27 of MCP terminal
block while shows DX
cooling. If voltage, check
wiring back to
compressor contactor. If
no voltage at pin 27,
check wiring back to
24VAC transformers in
system. If voltage at pin
27 but not at 17, replace
MCP.
Complaint Problem Symptom Action
Chilled water valve is
not opening because of
loose or broken wiring. Display shows chilled
water cooling is on or
economy cooling is on
but, the valve is closed. Test for 24VAC at valve
motor. Check continuity
between pins 3 and 12
of MCP and valve
motor. If continuity, test
for 5VDC to 10VDC
between pin 1 and 12 of
MCP. If no voltage,
replace MCP.
DIP switches on MCP
are set incorrectly. After setting a
temperature set point
sufficiently lower than
room air, and waiting
one minute, the display
never indicates cooling
is on or shows the
wrong type cooling. Refer to the section in
this guide, DIP Switch
Settings, and check that
the compressors are
enabled for DX systems
or disabled for chilled
water systems.
6. System does not heat
or does not heat
sufficiently.
Control parameters are
not set correctly or are
not set as expected.
System seems to
function okay
otherwise. Refer to the section in
this guide, Environment
Control Settings, and
check that all control
parameters are set