Trane Optimus RTHD, Installation, Operation And Maintenance Manual

Page: 47 / 96

Installation Electrical
RTHD-SVX01K-EN 47
Hardware Interface or Tracer (if Tracer is installed). Order
for precedence for all setpoints, TD7/Tracer
®
TU, then
External then Tracer from lowest to highest priority. If one
of the higher priority setpoints drops out due to a bad
sensor or communication loss then base loading shall go
to the next lowest priority of command and setpoint. The
command settings and control setpoints associated with
base loading are explained below.
Base Loading Control Setpoint
This setpoint has three possible sources, an External
Analog Input, TD7/Tracer
®
TU or Tracer
®
.
• TD7/Tracer
®
TU Base Loading Control Setpoint
• The range is 40 - 100% Compressor Load (Max %RLA).
The default is 50%.
• Tracer Base Loading Control Setpoint
• The range is 40 - 100% Compressor Load (Max %RLA).
The default is 50%.
• External Base Loading Setpoint
This is an Analog Input that sets the base loading setpoint.
This signal can be controlled by either a 2-10Vdc or 4-20ma
Signal based on configuration information. The equations
show the relationship between input and percent
compressor load:
If the input is configured as a 4 - 20 mA:
% Load = 3.75 * (mA Input) + 25
If the input is configured as a 2 - 10 Vdc:
% Load = 7.5 * (Vdc Input) + 25
Ice Building Contact - Optional
Symbio™ 800 accepts a contact closure input to initiate Ice
Building. When in the ice building mode, the compressor
will be fully loaded (not given a low setpoint) and will
continue to operate until the ice contacts open or the
return water temperature reaches the Ice Termination
Setpoint. If terminated on return setpoint, Symbio™ 800
will not allow chiller to restart until ice building contact is
opened.
Ice Machine Control - Optional
Symbio™ 800 provides an output contact closure that can
be used as a signal to the system that ice building is in
operation. This relay will be closed when ice building is in
progress and open when ice building has been terminated
by either Symbio™ 800 or remote interlock. It is used to
signal the system changes required to convert to and from
ice building.
External Chilled Water Setpoint - Optional
Symbio™ 800 will accept either a 2-10 Vdc or a 4-20 mA
input (J9-4, J9-5) signal, to adjust chilled water setpoint
remotely.
External Demand Limit Setpoint - Optional
Symbio™ 800 will accept either a 2-10Vdc or a 4-20mA
input (J7-11, J7-12) signal to adjust the demand limit
setpoint from a remote location.
Percent Condenser Pressure Output - Optional
Symbio™ 800 provides a 2-10 Vdc analog output to
indicate percent High Pressure Cutout (HPC) condenser
pressure.
Percent HPC = (Condenser Pressure/High Pressure Cutout
Setpoint)*100
Compressor Percent RLA Output - Optional
Symbio™ 800 provides a 2-10 Vdc analog output to
indicate %RLA of compressor starter average phase
current. The values of 2 to 10 Vdc correspond to 0 to 120%
RLA.
AFD Drive (Optional)
Trane TR200 drive is an electronic motor controller that
converts AC mains input into a variable AC waveform
output. The frequency and voltage of the output are
regulated to control the motor speed or torque.
TR200 drive includes the following features:
• Soft start to minimize inrush current
• Improved harmonic mitigation with DC link reactor
• Integrated power fuse
• Graphical LCD keypad
• Unit Mounted with factory pre-wiring
• ‘Trane Drive Utility’ for configuration and tracking
See Service Manual BAS-SVM01A-EN for more
information.
AFD Drive Installation
The AFD drive is manufactured with a jumper installed
between terminal 12 (+24Vdc source) and terminal 37
(Safe Stop digital input). This jumper must be removed
prior to unit operation. See
Figure 21 for view of jumper as
it would be installed on drive from manufacturer.
NOTICE
Equipment Damage!
Verify/remove jumper between AFD terminals 12 and
37 before unit operation. Failure to remove jumper
could cause equipment damage.