24
AC-SVX002C-EN
Evaporator Flow Switch
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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
Factory installed jumper wire W11 must be removed if
using auxiliary contacts and/or additional proof of flow.
See schematics in AC-SVE002*-EN for more details.
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If using auxiliary flow sensing, both yellow LEDs come
on initially when flow is stopped. The center yellow
LED will turn off after approximately 7 seconds. The
LED indicators are otherwise the same as indicated
above.
Indexing Flow Switch
To properly index the flow switch, the following
requirements must be met:
•
The dot must be at a position no greater than 90° off
Index.
•
The torque must be between 22 ft-lb minimum and
74 ft-lb maximum.
•
A minimum distance of 5x pipe diameter must be
maintained between flow switch and any bends,
valves, changes in cross sections, etc.
Figure 8. Proper flow switch indexing
Flow
Top View
Index
The flow switch must have the dot
in the shaded area to the left of this line
for proper indexing (±90° off Index).
Evaporator Label
The brazed plate heat exchanger (BPHE) label,
including barcode, is located under the insulation, in
the locations shown below. Insulation backing over this
area has not been removed, so it can be rolled back to
access the label.
Location of
Label and Barcode
Roll back the insulation
