Daikin Trailblazer AGZ030E-070E Installation, Operation And Maintenance Manual page 125

Figure 96: Flow Switch Details
It is commended, if possible, that the flow switch be mounted
such that the electrical connection and indentation 'mark' are
pointed in the direction of flow as shown in
important that the flow switch be mounted so that the probe is
sufficiently inserted into the fluid stream. It may not be mounted
directly on top or directly on the bottom of a horizontal pipe.
Figure 97: Remote Mounting Guidelines for Flow Switch
If the flow sensor is to be mounted away from the unit, the
sensor should be mounted on the wall of the outlet pipe of
evaporator, or in a run of straight pipe that allows 5 to 10 pipe
diameters prior to the sensor and 3 to 5 pipe diameters of
straight pipe after the sensor. Flow switch is placed in outlet
pipe to reflect flow leaving the barrel. If installation on the
inlet pipe is necessary, contact Chiller Technical Response
at TechResponse@DaikinApplied.com to review the jobsite
details.
NOTE: DO NOT alter or relocate factory installed flow switch.
If issues exist, contact Chiller Technical Response at
TechResponse@DaikinApplied.com.
If needed, the adapter is threaded into the pipe using pipe
sealant appropriate for the application. The flow sensor is
mounted onto the adapter using silicone grease. Carefully
apply lubricant to the inside threads and o-ring so temperature
probe does not become coated with lubricant. Torque the
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adapter/sensor connection to 18.5 ft/lbs.
Wiring
Refer to wiring diagram in the unit control panel. Either AC or
DC is used to power the flow switch. The unit controller's digital
input is a DC signal which is supplied through the switch output
of the flow switch for flow indication. It is required that the AC
and DC commons of power be separated. Contact Chiller
Technical Response for alternate wiring scenarios.
Flow Switch Setup
The flow switch comes from the factory set at a default velocity
of 300 cm/s. This value is typically well below the minimum
water flow specified for the unit's evaporator and condenser so
field adjustment is required for adequate low flow protection.
Table 87
Schedule 40 steel pipe for various fluid velocities from 15 cm/s
to 60 cm/s. The flow switch has a range of adjustment from 3
Figure 97. It is cm/s to 300 cm/s.
Step 1: Adjust flow through the evaporator to the minimum
desired operating gpm. Maintain this flow throughout the setup
procedure.
Step 2: Once steady state minimum desired operating flow is
obtained, perform the 'Teach' function on the flow switch. The
'Teach' function is initiated by holding down the minus '-' button
on the face of the flow switch for 15 seconds. During this 15
second period, LEDs '0' and '9' will be lit green. Once the
'Teach' function is completed, the outer LEDs will flash green
as shown in
Figure 98: Automatic Teach of Setpoint
Step 3: After the 'Teach' function is completed and the outer
LEDs flashed, the flow switch will indicate a new set point
based upon the current flow which should still be at the steady
state minimum desired operating flow.
typical display for this condition. All LEDs to the left of the
SP LED are lit green. The SP LED is lit RED (or may toggle
amber) which indicates that the flow switch is OPEN. Typically,
an increase in fluid flow is between 15% to 30% above the
'Teach' function flow is required for the SP LED to turn AMBER
and the flow switch to CLOSE indicating acceptable flow.
125
Startup and Shutdown Procedures
are the calculated gallons per minute (gpm) for
Figure 98.
IOM 1207-6 • TRAILBLAZER
Figure 99 shows a
MODEL AGZ CHILLERS
®