Marine Air Systems ECU-Maxx, Operation Manual

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PAGE 15
ECU-Maxx VER:10a 12/1/97
ECU-M
AXX
O
PERATIONS
M
ANUAL
P13: High Water Limit
The high water limit defines the availability of cooling water for the condenser coil.
The water pump and compressor are not allowed to operate above the high water
limit. High water temperatures at the condenser inlet usually indicate a lack of
cooling water. Temperatures at or above the high water limit are indicated by
alternately flashing "H-I" and then "H2O" in the display. Fail-safe protection
levels apply to the high water limit.
The range of the high water limit is 100º F to 150º F, with 140°F being the factory
default value. Use the Up and Down buttons to select the high water limit.
High water limit readings are taken with the compressor running and are
compensated for sensor location which is outside the Freon circuit. Since
cooling water flows inside the Freon circuit, the settings must be appropri-
ately high.
P14: Low Water Limit
The low water limit defines the availability of heat in the condenser water. Heating
can only occur at temperatures above the low water limit. The compressor and water
pump are not allowed to operate below the selected low water limit. Temperatures
at or below the low water limit are indicated by alternately flashing "L-O" then
"H2O" in the display. Fail-safe protection levels apply to the low water limit.
If the optional CAL rod heater is installed, the ECU-Maxx will automatically switch
to the CAL rod heater when the water temperature is below the limit. The LO / H2O
warning will not be displayed when the CAL rod heater is installed!
The range for the low water limit setting is 40º F through 60º F. 50°F is the factory
default setting for this function. Use the Up and Down buttons to select the low water
limit.
Low water limit readings are taken with the compressor running and are compensated for
sensor location which is outside the Freon circuit. Since cooling water flows inside the
Freon circuit, the settings must be appropriately low.
P15: Service / Water Sensor Option
The Service / Water Sensor is used to monitor the Water Temperature going through
the compressor condenser coils. The Service / Water Sensor jack is located on the
416 Option Board and must be programmed ON if it is installed. P13 and P14 require
the Service / Water Sensor be installed!
P16: High Pressure Switch Option
The circuit board is equipped with a pair of Fastons for a high-pressure Freon switch.
This software option can be turned off when the switch is not used or for trouble
shooting purposes.
P17: Low Pressure Switch Option
A pair of Fastons are supplied for an optional low Freon pressure switch. This
software option can be turned off when the switch is not used or for trouble shooting
purposes.