Daikin SWP Series Installation Manual page 20

Clogged Filter Switch
A clogged filter switch (PC5) is provided to indicate when the
unit filters are to be changed. The switch is factory set to close
at 1 .0 inches of H O. The switch has a field-adjustable set
2
point range of 0 .05 to 5 .0 inches of H
screw clockwise to decrease differential pressure setting . Turn
the adjustment screw counterclockwise to increase differential
pressure setting. When the filter pressure differential exceeds
the switch setpoint, MicroTech III controller displays a clogged
filter indication. The unit is allowed to continue operation. PC5 is
located in the main control panel .
Phase Fail/Under Voltage
Protection
The phase voltage monitor (page
voltage, phase imbalance, and phase loss (single phasing)
when any one of three line voltages drops to 74% or less of
setting . This device also protects against phase reversal when
improper phase sequence is applied to equipment and protects
against low voltage (brownout) when all three line voltages drop
to 90% or less of setting . An indicator run light is ON when all
phase voltages are within specified limits. The phase voltage
monitor is located on the load side of the power block with a set
of contacts wired to the 115-volt control circuit to shut down the
unit whenever phase voltages are outside the specified limits.
IM 1032-2 • Self-Contained Air Conditioning System
O . Turn the adjustment
2
19) protects against high
Duct High Limit
A duct high limit (DHL) pressure control is provided as
standard with all units with variable air volume control . The
duct high limit is intended to protect the ductwork, etc . from
over pressurization caused by tripped fire dampers or a control
failure . When the duct pressure exceeds the setting of the
control, the unit de-energizes via the MicroTech III controller,
which displays an alarm condition . After the reason for trip is
identified and corrected, reset the control via the MicroTech III
keypad/display interface .
The duct high limit control is factory installed, including sensing
tubing, and preset for a 3 .0" inches of H2O trip point . The control
can be readjusted in the field to match the specific ductwork of
a project. The switch has a field-adjustable set point range of
0 .05 to 5 .0 inches of H O . Turn the adjustment screw clockwise
2
to decrease differential pressure setting . Turn the adjustment
screw counterclockwise to increase differential pressure setting .
The DHL is located in the main control panel .
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