Marine Air Systems ECU-Maxx, Руководство по эксплуатации

Страница: 14 / 31

PAGE 14
ECU-Maxx VER:10a 12/1/97
ECU-M
AXX
O
PERATIONS
M
ANUAL
P-8: High Fan Speed Limit
The upper limit of the fan speed can be reduced to tailor the fan output for various
motors. The range of values for the high fan speed are 50 through 80 in arbitrary
units. The high fan limit is not permitted above 220 VAC to prevent excessive
fan noise.
Use the Up and Down buttons to select the fan speed preset. The factory default
setting of this function is 70.
P-9: Low Fan Speed Limit
The low fan limit determines the lowest output allowed for Low Fan speed. The
range of values for the low fan speed are 25 through 49 in arbitrary units.
Use the Up and Down buttons to select the fan speed preset. The factory default
value of this function is 40.
P10: Fan Motor Select
The fan motor select option provides separate low line voltage corrections for
two basic types of motors used in most systems. This option does not select the
fan speed tables for fan speeds 1-6. High and low fan speed limits must be
adjusted for each fan.
SP selects the shaded pole fan option (factory default)
SC selects the split capacitor type fan.
P11: Automatic Fan Speed Spread
Automatic fan speeds are directly related to temperature reduction in cooling
and temperature increases in heating. There are two options available: 1º spread
per fan speed or 2º spread per fan speed. In cooling, the fan speeds increase as
the temperature exceeds the set point. In heating, the fan speed increases as the
temperature decreases in relation to the set point. In both cases, the fan speed
increases as the temperature differential between set point and room tempera-
ture increases.
1 programs 1º per fan speed. This will bring the fan up to high speed when the set
point is 6º from the room temperature. This is the factory default setting.
2 programs 2º spread per fan speed. High fan will be generated at an 12º
difference between set point and actual temperature.
Note: High fan speed is not likely to recur after the set point has been reached on
initial start-up in mode 2 . This option is provided to help reduce overall system noise
by minimizing operation at or near high fan speed.
P12: Automatic Fan Speed Heating Option
Because of the many installation variables, high head pressure can be a problem
in the heating mode. To help reduce head pressure, the automatic fan speed
operation can be reversed in the heating mode. In other words, the fan speed
increases as the set point is approached in heating mode. The fan speed spread
option applies to this option.