56
AC-SVX003A-EN
Evaporator Flow Switch
The flow switch is factory-installed and programmed based
on the operating conditions submitted with the order. The
leaving evaporator temperature, fluid type and fluid
concentration affect the selected flow switch. If the
operating conditions on the job site change, the flow switch
may need to be replaced. Contact your local Trane Sales
office for more information.
The sensor head includes 3 LEDs, two yellow and one
green. Wait 15 seconds after power is applied to the sensor
before evaluating LEDs for flow status. When wired
correctly and flow is established, only the green LED
should be lit. Following are the LED indicators:
• Green ON, both yellow OFF — Flow
• Green and outside yellow ON — No Flow
• Center yellow ON continuously — Miswire
Pump Package
The pump package contains a single pump, triple-duty
valves, service isolation valves, pressure ports, air
separator, expansion tank, and fluid strainer. Included is
-20°F (-29°C) ambient freeze protection for water.
The pump skid contains an independent pump motor
starter panel. The pump starter panel’s power supply is
prewired into the chiller’s control panel assembly. An
independent pump motor supply is not required. Variable
pump speed command is integrated with the chiller
controller, allowing variable flow functionality. Harmonic
filtration is standard.
Pump package applications include short loops, decoupled
systems, and service for an entire loop volume. Because
the fluid distribution system beyond the chiller is unknown,
Trane Select Assist reports Available Head as the head
leaving the chiller at the system supply connection point.
Available Head includes the evaporator head loss, pump
package and free-cooling piping frictional effects head
losses, valve head losses, air separator head loss, and
strainer head loss summation.
See Figure 20, p. 57 for generally recommended field
installed piping components and locations.
NOTICE
Equipment Damage!
Failure to follow instructions could result in
equipment damage.
Do not operate the pump package at NPSH
R
.
Operation at this suction head will cause cavitation.
NPSH
A
should be at least 1.5 to 2.5 times NPSH
R
.
Installation Mechanical
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