Leaving Chilled Water Piping; Water Strainer; Flow Switch - Trane CGAM Installation & Operation Manual

Installation - Mechanical

Leaving Chilled Water Piping

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NOTICE:
Water Damage!
Standard pressure is 72.5 Psig for all factory installed components on the suction side of water
pump. Standard pressure of components on the discharge side of water pump is 145 Psig. You
MUST drain the system FIRST before releasing the pressure. Failure to do so could result in
water spray which could cause equipment and/or property damage.

Water Strainer

The water strainer is factory-installed with taps for the pressure gauges on the inlet and outlet.
Install pressure gauges in order to measure differential pressure across the filter. This will help to
determine when it is necessary to clean the water strainer.

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.
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:
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Factory installed jumper wire W11 must be removed if using auxiliary contacts and/or additional
proof of flow. See schematics in section
Note: Use caution when connecting the auxiliary contacts. Terminals 1X5-3 and 1X5-9 are to be
NOTICE:
Equipment Damage!
Incorrect wiring of auxiliary contacts could cause equipment damage.
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.
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Air vents (to bleed air from system)
Water pressure gauges with shutoff valves
Vibration eliminators
Shutoff (isolation) valves
Thermometers (if desired)
Balancing valve
Green ON, both yellow OFF — Flow
Green and outside yellow ON — No Flow
Center yellow ON continuously — Miswire
used for field connections of auxiliary contacts. Inadvertant use of 1X5-4 and 1X5-9 will
result in a FALSE FLOW indication.
"Unit Wiring, " p. 183 for more details.
CG-SVX17D-EN