Daikin Navigator WWV - Flow Switch Wiring and Setup; Flow Switch Setup Procedure; Remote Flow Switch Mounting

53
IOM 1264-4
WWW.DAIKINAPPLIED.COM
MAINTENANCE
It is required that the ow switch be mounted such that the
electrical connection and indentation ‘mark’ are pointed in the
direction of ow as shown in Figure 33.
If the ow sensor is to be mounted away from the unit, the sensor
should be mounted on the wall of the outlet pipe of evaporator
and condenser, 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 reect ow leaving the barrel. If installation on the
inlet pipe is necessary, contact Chiller Technical Response at
TechResponse@DaikinApplied.com to review the jobsite details.
Figure 33: Mount in Direction of Flow
It is important that the ow switch be mounted so that the probe
is su󰀩ciently inserted into the uid stream. Figure 34 illustrates
the recommended orientation of the sensor. It may not be
mounted directly on top or directly on the bottom of a horizontal
pipe.
NOTICE
DO NOT alter or relocate factory installed ow switch. If issues exist, contact
Chiller Technical Response at TechResponse@DaikinApplied.com.
Figure 34: Remote Mounting Guidelines for Flow Switch
If needed, the adapter is threaded into the pipe using pipe
sealant appropriate for the application. The ow 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 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 ow switch. The unit
controller’s digital input is a DC signal which is supplied through
the switch output of the ow switch for ow 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 ow switch comes from the factory set at a default velocity
of 20 cm/s. This value is typically well below the minimum water
ow specied for the unit evaporator and condenser so eld
adjustment is required for adequate low ow protection. Table 31
shows the calculated gallons per minute (gpm) for Schedule 40
steel pipe for various uid velocities from 20 cm/s to 300 cm/s.
The ow switch has an overall range of adjustment from 3 cm/s
to 300 cm/s.
Step 1: Adjust ow through the evaporator to the minimum
desired operating gpm. Maintain this ow throughout the setup
procedure.
Step 2: Once steady state minimum desired operating ow is
obtained, perform the ‘Teach’ function on the ow switch. The
‘Teach’ function is initiated by holding down the minus ‘-’ button
on the face of the ow 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 ash green as shown
in Figure 35.
Figure 35: Automatic Teach of Setpoint