Daikin IOM 1062, Инструкция по установке, эксплуатации и обслуживанию, Страница: 21 / 32

IOM 1062 Direct Drive Fluid Coolers 21
Sensor Failure Operation (SF): establishes how the A419 control operates the fan in the
event of a sensor or sensor wiring failure. The user may select either to run the equipment
continuously or to shut it down. When the control detects a sensor circuit failure, the LCD
flashes SF alternately with OP if the sensor circuit is open, or SH if the sensor circuit is
shorted. Before indicating a failure, the control implements a 1-minute delay, which allows
verification of failure condition and avoids nuisance failure indications.
Temperature Offset (OFS): establishes the temperature setpoint shift (F° or C°) applied
when the binary input (BIN) and common (COM) terminals are connected together. The
Temperature Offset may be set from 0 to 50F° or C°. See the
Offset Function section on
page 21.
Temperature Units:
establishes the units of temperature (Fahrenheit or Celsius) displayed
on the LCD.
Functions Set by Jumper Position
For instructions on positioning jumpers, see Positioning the Jumpers on page 23 in the
Adjustments section. Refer to Figure 12 for jumper locations.
Heating/Cooling: Removing or installing the upper jumper at P4 establishes whether the
control operates in the Heating or Cooling mode.
Setpoint Mode: Removing or installing the lower jumper at P4 establishes whether
Setpoint is the Cut-in temperature or Cut-out temperature.
Keypad Lock: Removing or installing the jumper at P5 establishes whether the keypad is
locked or unlocked. Locking the keypad deters accidental or unauthorized changes to all of
the function parameters.
Temperature Offset Function
The Temperature Offset function shifts Heating setpoint lower and Cooling setpoint higher
by the value
in
the Temperature Offset. This function is not normally used on fluid cooler
applications.
The Temperature Offset is activated by closing a circuit between BIN and COM. (See
Figures 7, 8, or 9.) The BIN and COM terminals may be connected to a user-supplied
external switching device, such as a time clock, that has a set of SPST contacts.
This option enables the control to alternate between two temperature setpoints based on the
position of the binary input switch. The number of degrees added to, or subtracted from,
Setpoint is established in the Temperature Offset function (OFS) using the keypad, as
described in
Setting Other Functions on page 26 .
Table 12 shows an example of the effect of the Temperature Offset function when
it
is
active.
Table 12, Sample Offset Function Effect
Mode Setpoint
Temperature
Offset Value
Shifted
Setpoint*
Cooling 70° 8° 78°
Heating 70° 8° 62°
*Setpoint when switch is closed.
When the binary input (BIN) is connected to the common (COM), the Offset function is
enabled and
BIN
is displayed on the LCD above the °F or °C symbol, as shown in Figure 4.