Additional Fault Troubleshooting Information - CTM CW-24H Installation & User Manual

ADDITIONAL FAULT TROUBLESHOOTING INFORMATION

The HIGH LIMIT SENSOR and RETURN WATER SENSOR are connected to stage one. Because the
system cannot operate properly without these sensors, four consecutive high limit failures or four
consecutive return sensor failures will cause the system to shut down and lockout.
Since all the systems critical components are connected to stage one, the entire system is shut down
when stage on fails to communicate with the staging controller. Stage one compressor can be
by-passed, however, stage one (1) will continue to operate the systems critical components.
The seawater pump, chill water pump, inlet water and outlet water sensor must be connected to stage
one DDC. Stage one (1) is defined by plugging the assigned DDC module into number one location on
the DDC interface board.
Fatal faults are defined as four (4) consecutive failures on a stage causing that stage to be locked out.
The service light will flash; the display will indicate the fault and lockout condition. The stage can be
cleared and restarted by pressing the SELECT BUTTON. Accumulated stage faults are automatically
cleared, before fourth fault, if the stage operates four hours (4) without any new faults.
High Freon pressure lockout faults are ignored in the heat mode. The compressor will shut down, the
stage delay timer will start when the fault clears and the compressor will start after the stage delay
times out Low Freon pressure fault has a ten (10) minute delay allowing the compressor to come up to
normal operating pressures.
The water outlet temperature is acquired via the freeze-stat sensors.
When a stage is by-passed the staging temperature and staging delay are automatically adjusted so
there is neither a timing nor temperature gap. The next stage in line assumes the by-passed stage's
timing and staging temperature.
The stage controller is factory configured for standard reverse cycle heating. When installing electric
heaters the reverse cycle feature is not available. The heating stages NOT equipped with electric
heaters must be de-selected in the program mode. Use the standard by-pass method to de-select
heater stages that are not installed. Electric heaters should be installed starting with stage one.
BIMINI JUMPERS
Four jumpers are provided on the board for troubleshooting and emergency operation. Moving the
VLV (valve), SWP (sea water pump), and CWP (loop pump) to cover the two pins closest to the black
electric power terminal strip will force those outputs on. Moving the COMP (compressor) jumper will
force the compressor relay on only if the freeze temperature is above 42°F (5.6°C).
CTM Marine Chilled Water Systems Installation & User Manual
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