Trane RT-SVX38C-EN, Installation, Operation And Maintenance Manual

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Pre-Start
30 RT-SVX38C-EN
Yellow (phase C) to L3
• Close the field-supplied main power disconnect switch
or circuit protector switch that provides the supply
power to the unit.
Note: Upon closing main power disconnect and the
unit-mounted disconnect switch or circuit breaker,
the phase monitor will verify proper phasing. If LED
on face of the monitor is red, correct supply power
fault.
To prevent injury or death from electrocution, it is the
responsibility of the technician to recognize this hazard
and use extreme care when performing service
procedures with the electrical power energized.
• Observe the ABC and CBA phase indicator lights on the
face of the sequencer. The ABC indicator light will glow
if the phase is ABC. If the CBA indicator light glows,
open the disconnect switch or circuit protection switch
and reverse any two power wires.
• Restore the main electrical power and recheck the
phasing. If the phasing is correct, open the disconnect
switch or circuit protection switch and remove the
phase sequence indicator.
Compressor Crankcase Heaters (Optional)
Each compressor can be equipped with a crankcase heater
(on some units the crankcase heater comes standard). The
proper operation of the crankcase heater is important to
maintain an elevated compressor oil temperature during
the OFF cycle to reduce oil foaming during compressor
starts. Oil foaming occurs when refrigerant condenses in
the compressor and mixes with the oil. In lower ambient
conditions, refrigerant migration to the compressor could
increase.
When the compressor starts, the sudden reduction in
crankcase pressure causes the liquid refrigerant to boil
rapidly causing the oil to foam. This condition could
damage compressor bearings due to reduced lubrication
and could cause compressor mechanical failures.
Before starting the unit in the “Cooling” mode, set the
system switch to the OFF position and turn the main power
disconnect to the ON position and allow the crankcase
heater to operate a minimum of 8 hours.
Before closing the main power disconnect switch, ensure
that the “System” selection switch is in the OFF position
and the “Fan” selection switch is in the “Auto” position.
Close the main power disconnect switch and the
unit-mounted disconnect switch, if applicable.
Note: Upon closing main power disconnect and the
unit-mounted disconnect switch or circuit breaker,
the phase monitor will verify proper phasing. If LED
on face of the monitor is red, correct supply power
fault.
To prevent injury or death from electrocution, it is the
responsibility of the technician to recognize this hazard
and use extreme care when performing service
procedures with the electrical power energized.
ReliaTel™ Controls
Upon power initialization, the RTRM performs
self-diagnostic checks to ensure that all internal controls
are functional. It also checks the configuration parameters
against the components connected to the system. The
Liteport LED located on the RTRM module turns on within
one second of power-up if internal operation is okay.
Use one of the following “Test” procedures to bypass
some time delays and to start the unit at the control panel.
Each step of unit operation can be activated individually by
temporarily shorting across the “Test” terminals for two to
three seconds. The Liteport LED located on the RTRM
module will blink when the test mode has been initiated.
The unit can be left in any “Test” step for up to one hour
before it will automatically terminate, or it can be
terminated by opening the main power disconnect switch.
Once the test mode has been terminated, the Liteport LED
will glow continuously and the unit will revert to the
“System” control.
WARNING
Live Electrical Components!
During installation, testing, servicing and
troubleshooting of this product, it may be necessary to
work with live electrical components. Have a qualified
licensed electrician or other individual who has been
properly trained in handling live electrical components
perform these tasks. Failure to follow all electrical safety
precautions when exposed to live electrical
components could result in death or serious injury.
WARNING
Live Electrical Components!
During installation, testing, servicing and
troubleshooting of this product, it may be necessary to
work with live electrical components. Have a qualified
licensed electrician or other individual who has been
properly trained in handling live electrical components
perform these tasks. Failure to follow all electrical
safety precautions when exposed to live electrical
components could result in death or serious injury.