Chilled Water Pump Performance And Operation - Trane RTAC Installation, Operation And Maintenance Manual

Installation - Electrical
• A field supplied disconnect switch must be installed at
or near the unit in accordance with the National
Electrical Code (NEC latest edition).
• Complete the unit's power wiring connections onto
either the factory supplied cam-type receptacle, or the
factory mounted lug-type connector inside the power
supply box. Terminal lugs are provided for field supplied
wire terminals. For specific termination points, refer to
the ship-with, customer connection diagram.
Chilled Water Pump
Performance and Operation
NOTICE
Proper Water Treatment Required!
The use of untreated or improperly treated water
could result in scaling, erosion, corrosion, algae or
slime.
Use the services of a qualified water treatment
specialist to determine what water treatment, if any, is
required. Trane assumes no responsibility for
equipment failures which result from untreated or
improperly treated water, or saline or brackish water.
Each RTAC unit comes with a 460 Volt, 3 phase, 60 hertz,
centrifugal water pump permanently installed on the RTAC
unit. The shore power panel provides power to the pump
and has a control switch with an indication light that will be
lit when the pump is running. The pump switch can be used
to select between 3 operating modes: Off, Hand, and Auto.
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When the pump is in the "Auto" mode of operation, the
pump is controlled through the RTAC chiller controls. When
the pump is in the "Hand" mode, the pump will run until the
operating mode is changed. When the pump is in the "Off"
mode, the pump will remain off until the operating mode is
changed.
NOTICE
Evaporator Damage!
Failure to follow these instructions could result in
damage to the evaporator.
If insufficient concentration or no freeze inhibitor is
used, the evaporator water flow must be controlled by
the unit controller AND heaters must be used to avoid
catastrophic damage to the evaporator due to
freezing. It is the responsibility of the installing
contractor and/or the customer to ensure that a pump
will start when called upon by the chiller controls.
Even with water pump control, a power loss of as little
as 15 minutes under freezing conditions can damage
the evaporator. Only the proper addition of freeze
inhibitor or complete drainage of the water circuit can
ensure no evaporator damage in the event of a power
failure.
Note: F2-F4 style chillers include optional on-board pump
bypass piping. It is recommended that chiller
maintains control over pump (on-board or skid
mounted) in order to avoid potential freezing
condition.
RTAC-SVX005A-EN