Marine Air Systems vector compact - Programming Notes

U11 REVERSE CYCLE OR ELECTRIC HEAT: Units not equipped with reverse cycle heating, or
reverse cycle units operating in seawater temperatures below 40°F, may need to have electric heaters
added. IMPORTANT: the Passport II circuit board reversing valve output is used to control the
optional electric heater. The valve output relay can only carry 6 amps, therefore, a heavy-duty
contactor must be installed to carry the electric heater current. Select one (1) for the electric heat
option, select zero (0) for reverse cycle heating. The factory default is zero (0).
U12 FAN MOTOR TYPE SELECTION: This feature allows the controller to be programmed for
the type of motor on the unit's fan. Zero (0) selects a shaded pole motor, which is used on most Vector
Compact units. Select one (1) for units having "HV" or "EBM" in their model number, these units
have a split capacitor motor. The controller has been factory programmed for the appropriate motor
type.
U15 DE-ICING CYCLE: Under certain extreme conditions ice may build up on the evaporator coil.
Running the a/c at a low set point with the hatches and doors open on a hot humid day would be an
example of this. If the a/c runs for an hour in cool mode and during that time the ambient temperature
does not change by more than one degree, the de-icing cycle will activate turning the unit into reverse
cycle heat for one to three minutes depending on the setting. The programmable parameter may be set
at zero (0), one (1), two (2), or three (3) minutes. If the evaporator coil is still iced up after three
minutes, see the trouble shooting section of this manual. The factory default is zero (0), which is off.
PROGRAMMING NOTES
17