Ton Eflex™ Variable Speed; Tandem; Precision Suction Restrictor; Vfd Programming Parameters - Trane IntelliPak 1 with Symbio 800 Installation, Operation And Maintenance Manual

interchange any two leads to check the internal motor
phasing.
75 Ton eFlex™ Variable Speed Tandem
The 75 Ton eFlex™ variable speed compressor is
manifolded with a CSHN fixed speed compressor. It uses a
patented manifold design that is different from fixed speed
tandems as follows:
1. The variable speed compressor is always first on and
located upstream in the suction line in position 1B;
2. A nozzle in the suction tee, directly upstream of the
manifold set, separates suction oil return to the
upstream variable speed compressor. It also provides a
sump pressure difference to move excess oil from the
variable speed to the fixed speed compressor when
both compressors are running. The nozzle is
specifically sized for this variable speed manifold
compressor combination and must not be removed.
Suction restrictors are not used, and a smaller 3/8" OD
oil equalizer line is used to help maintain the sump
pressure differential.
Figure 119. eFlex variable speed tandem
Fixed
speed
compressor

Precision Suction Restrictor

Tandem manifold compressors that have unequal capacity
sizes use a precision suction restrictor to balance the oil
levels in the compressors (see figure below). This restrictor
is placed in the smaller capacity compressor. When
replacing this compressor, it is imperative that the proper
restrictor is selected from those provided with the
replacement compressor.
When the compressors are restarted, verify that correct oil
levels are obtained with both compressors operating.
RT-SVX072D-EN
Figure 120. Precision suction restrictor
VFD Programming Parameters (Supply/
Relief)
Nozzle
Inflow
Combined
suction
flow
Variable
speed
compressor
Units shipped with an optional variable frequency drive
(VFD) are preset and run tested at the factory. If a problem
with a VFD occurs, ensure that the programmed
parameters listed in have been set before replacing the
drive.
Verify Parameters
Verify parameter 1-23 is set to 60 Hz (or 50 Hz where
applicable) and that parameter 0-06 is set to the correct
supply voltage/frequency range.
1. To check parameter 1-23 press the Main Menu button
2. Scroll down to Load & Motor, press OK
3. Select 1-2, press OK
4. Press down until parameter 1-23 is displayed.
5. When the desired selection has been made, press OK .
Should replacing the VFD become necessary, the
replacement is not configured with all of Trane's operating
Service and Maintenance
WARNING
Hazardous Voltage w/Capacitors!
Failure to disconnect power and discharge capacitors
before servicing could result in death or serious
injury.
Disconnect all electric power, including remote
disconnects and discharge all motor start/run
capacitors before servicing. Follow proper lockout/
tagout procedures to ensure the power cannot be
inadvertently energized. For variable frequency drives
or other energy storing components provided by
Trane or others, refer to the appropriate
manufacturer's literature for allowable waiting periods
for discharge of capacitors. Verify with a CAT III or IV
voltmeter rated per NFPA 70E that all capacitors have
discharged.
twice (if TR150 drive) (press the Back button if the main
menu does not display)
Parameter 1-23 can then be modified by pressing OK
and pressing the Up and Down buttons.
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