Precision Suction Restrictor; Vfd Programming Parameters - Trane IntelliPak 3 with Symbio 800 Installation, Operation And Maintenance Manual

Service and Maintenance
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 105. 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.
Figure 106. Precision suction restrictor
VFD Programming Parameters (Supply/
Condenser for Low Ambient Option)
Units shipped with variable frequency drives (VFD) are
preset and run tested at the factory. If a problem with a
152
VFD occurs, ensure that the programmed parameters
listed in
fan VFDs and for condenser fan VFDs (if low ambient
option is installed), have been set before replacing the
drive.
Verify Parameters
Verify parameter 1-23 is set to motor nameplate frequency.
1. To check parameter 1-23 press the Main Menu button
2. Scroll down to Load & Motor, press OK
Nozzle
3. Select 1-2, press OK
Inflow
4. Press down until parameter 1-23 is displayed.
Combined
suction
flow
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
Variable
speed
parameters. The VFD must be programmed before
compressor
attempting to operate the unit.
To verify and/or program a VFD, use the following steps:
1. At the unit, turn the 115 volt control circuit switch to the
Important: HIGH VOLTAGE IS PRESENT AT TERMINAL
2. To modify parameters:
3. Repeat
4. To reset all programming parameters back to the
Table 72, p. 153 and Table 73, p. 155
twice (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.
Off position.
BLOCK OR OPTIONAL UNIT DISCONNECT
SWITCH.
a. Press Main Menu twice (press Back if the main
menu does not display)
b. Use the Up and Down buttons to find the parameter
menu group (first part of parameter number)
c. Press OK
d. Use the Up and Down buttons to select the correct
parameter sub-group (first digit of second part of
parameter number)
e. Press OK
f. Use the Up and Down buttons to select the specific
parameter
g. Press OK
h. To move to a different digit within a parameter
setting, use the Left and Right buttons (Highlighted
area indicates digit selected for change)
i. Use the Up and Down buttons to adjust the digit
j. Press Cancel to disregard change, or press OK to
accept change and enter the new setting
Table 72, p. 153 and
supply fan VFDs and for condenser fan VFDs (if low
ambient option is installed).
factory defaults:
a. Go to parameter 14-22 Operation Mode
for supply
Table 73, p. 155 for
RT-SVX080A-EN