Service & Maintenance
102 RT-SVX35H-EN
VFD Programming Parameters
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 Table 39 have been set before
replacing the drive.
Note: Check to make sure that parameter 1-23 is set to 60
Hz. To check parameter 1-23 press the Main Menu
button (press Back b
utton if the main menu does
n
ot display), use the Down button to scroll down to
Load & Motor, press OK, use the Down button to
select 1-2, press OK, and finally use the Down
button until parameter 1-23 is displayed. Parameter
1-23 can then be modified by pressing OK button
and using Up and Down buttons. When the desired
selection has been made, press the OK button.
Should replacing the a VFD become
necessary, the
r
eplacement is not configured with all of Trane's operating
parameters. The VFD must be programmed before
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 1S70
to the "Off" position.
2. Turn the 24 volt control circuit switch to the "Off'
position.
3. To modify parameters:
(a) Press Main Menu button (press [Back] button if the
m
ain menu does not display)
(b) Use the Up and Down Arrow buttons to find the
parameter menu group (first part of parameter
number)
(c) Press OK
(d) Use Up and Down Arrow buttons to select the
correct parameter sub-group (first digit of second part
of parameter number)
(e) Press OK
Table 38. Refrigerant coil fin data
Evaporator Coil
Casing Size (ft
2
)
Rows/Fin
Series Tube Diameter/Surface
2
20.3 4/168 1/2"/Enhanced
20.3 4/168 1/2"/Enhanced
3 25.5 5/168 3/8"/Enhanced
4 32.5 5/168 3/8"/Enhanced
5 38 4/168 1/2"/Enhanced
6 43 6/168 3/8"/Enhanced
9 59.3 6/148 1/2"/Enhanced
Table 39. Supply and exhaust fan VFD programming parameters
(a)
Menu Parameter Description Setting Description
Load & Motor
1-21 Motor Power Set Based on Motor Nameplate
Set only for applications using 3hp Hi-Efficiency
motors. Set to 2.2 kW/3hp.
1-22 Motor Voltage Set Based on Motor Nameplate
Set only for 200/230v 60hz & 380/415 50hz
applications
1-24 Motor Current Set Based on Motor Nameplate Sets the motor FLA
1-25 Motor Speed Set Based on Motor Nameplate Sets the motor rpm
Limits & Warnings 4-18 Current Limit 100% x Rated Current Limits the maximum current to motor
(a) These parameters are motor specific and the actual motor nameplate rating must be used. Do not use the unit nameplate values.
WARNING
Hazardous Voltage w/Capacitors!
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 an appropriate voltmeter that all
ca
pacitors have discharged. Failure to disconnect power
and discharge capacitors before servicing could result in
death or serious injury.
HIGH VOLTAGE IS PRESENT AT TERMINAL BLOCK 1TB1
OR UNIT DISCONNECT SWITCH 1S14.
For additional information regarding the safe discharge
of capacitors, see PROD-SVB06A-EN
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