Daikin WGZ030DW Installation, Operation And Maintenance Manual page 91

circuit is higher than 5.1K Ohms. The module will lockout
the compressor if the number of Code 4 Alerts exceeds the
user configurable number of Code 4 events within a 24 hour
period. Once the module has locked out the compressor, a
power cycle or Modbus reset command will be required to
clear the lockout.
Code 5 – Reserved for Future Use
Code 6 – Missing Phase: The module will flash the red
Alert LED six times indicating a missing phase in one of the
three leads to the compressor. A Code 6 Alert will open the
M2-M1 contacts. The Alert will reset after 5 minutes and the
M2-M1 contacts will close if the missing phase condition is
not present. The module will lockout the compressor after 10
consecutive Code 6 Alerts. Once the module has locked out
the compressor, a power cycle or Modbus reset command
will be required to clear the lockout.
Code 7 – Reverse Phase: The module will fl ash the red
Alert LED seven times indicating a reverse phase in two
of the three leads to the compressor. A Code 7 Alert will
open the M2-M1 contacts. The module will lockout the
compressor after one Code 7 Alert. A power cycle or
Modbus reset command will be required to clear the lockout.
Code 8 – Reserved For Future Use
Code 9 – Module Low Voltage
The module will fl ash the red Alert LED nine times indicating
low module voltage (see Table 2) on the T2-T1 terminals for
more than 5 seconds. A Code 9 Alert will open the M2-M1
contacts. The Alert will reset after 5 minutes and the M2-M1
contacts will close if the T2-T1 voltage is above the reset
value
Resetting Alert Codes
Resetting Alert codes can be accomplished in two different
ways. First, Alert codes can be reset manually by cycling
power to the module (disconnect T2 or T1 for 5 seconds). The
second way to reset Alert codes is to send a Modbus reset
command from the master controller. If the fault that initiated
the Alert code is absent after one of the above resets is
performed, the Alert code will be cleared and CoreSense will
allow normal operation. If the fault is still present after the reset
is performed the fault code will continue to be displayed via the
green or red flashing LED.
Optional Controls
Phase/Voltage Monitor (Optional)
The phase/voltage monitor is a device that provides protection
against three-phase electrical motor loss due to power failure
conditions, phase loss, and phase reversal. Whenever any
of these conditions occur, an input relay is deactivated,
disconnecting power to the thermostatic control circuit. The
compressor does a rapid shutdown including a pump down
cycle.
The input relay remains deactivated until power line conditions
return to an acceptable level. Trip and reset delays have been
provided to prevent nuisance tripping due to rapid power
fluctuations.
www.DaikinApplied.com
When three-phase power has been applied, the input relay
should close and the "run light" should come on. If the relay
does not close, perform the following tests.
1. 1. Check the voltages between L1-L2, L1-L3, and L2-
L3. These voltages should be approximately equal and
within +10% of the rated three-phase line-to-line voltage.
2. 2. If these voltages are extremely low or widely
unbalanced, check the power system to determine
thecause of the problem.
3. 3. If the voltages are good, turn off the power and
inter-change any two of the supply power leads at the
disconnect switch.
This may be necessary, as the phase/voltage monitor is
sensitive to phase reversal. Turn on the power. The relay
should now close after the appropriate delay.
Factory settings are as follows:
Voltage Setting, set at nameplate voltage.
Trip Delay Time, 2 seconds
Restart Delay Time, 60 seconds
Hot Gas Bypass (Optional)
This option allows passage of discharge gas to the evaporator,
permitting operation at lower loads than available with
compressor unloading. It also keeps the velocity of refrigerant
gas high enough for proper oil return at light load conditions.
The pressure regulating valve is a Sporlan SHGBE-8 and
factory set to begin opening at 69 psig and can be changed
by changing the pressure setting. The adjustment range is
0 to 100 psig. To raise the pressure setting, remove the cap
on the bulb and turn the adjustment screw clockwise. To
lower the setting, turn the screw counterclockwise. Do not
force the adjustment beyond the range it is designed for, as
this will damage the adjustment assembly. The regulating
valve opening point can be determined by slowly reducing
the system load while observing the suction pressure. When
the bypass valve starts to open, the refrigerant line on the
evaporator side of the valve will begin to feel warm to the
touch.
When performing valve checkout procedure the hot gas line can become
hot enough in a short period of time to cause personal injury. Be sure to
read and understand the installation, operation, and service instructions
within this manual.
91 IOM 1322 • WATER-COOLED SCROLL COMPRESSOR
Unit Controller Operation
WARNING