Trane RTAC 140-500 ton units (60 Hz) User Manual
82
RTAC-SVX01F-EN
Installation - Electrical
If the ECLS input develops an open or short, the LLID will report either a very high or
very low value back to the man processor. This will generate an informational
diagnostic and the unit will default to using the Front Panel (DynaView) Current Limit
Setpoint.
very low value back to the man processor. This will generate an informational
diagnostic and the unit will default to using the Front Panel (DynaView) Current Limit
Setpoint.
The TechView Service Tool must be used to set the input signal type from the factory
default of 2-10 VDC to that of 4-20 mA current. TechView must be also be used to
install or remove the External Current Limit Setpoint Option for field installation, or
can be used to enable or disable the feature (if installed).
default of 2-10 VDC to that of 4-20 mA current. TechView must be also be used to
install or remove the External Current Limit Setpoint Option for field installation, or
can be used to enable or disable the feature (if installed).
ECLS and ECWS Analog Input Signal Wiring Details:
Both the ECWS and ECLS can be connected and setup as either a 2-10 VDC (factory
default), 4-20 mA, or resistance input (also a form of 4-2OmA) as indicated below.
Depending on the type to be used, the TechView Service Tool must be used to
configure the LLID and the MP for the proper input type that is being used. This is
accomplished by a setting change on the Custom Tab of the Configuration View
within TechView.
default), 4-20 mA, or resistance input (also a form of 4-2OmA) as indicated below.
Depending on the type to be used, the TechView Service Tool must be used to
configure the LLID and the MP for the proper input type that is being used. This is
accomplished by a setting change on the Custom Tab of the Configuration View
within TechView.
The J2-3 and J2-6 terminal is chassis grounded and terminal J2- 1 and J2-4 can be
used to source 12 VDC. The ECLS uses terminals J2-2 and J2-3. ECWS uses
terminals J2-5 and J2-6. Both inputs are only compatible with high-side current
sources.
used to source 12 VDC. The ECLS uses terminals J2-2 and J2-3. ECWS uses
terminals J2-5 and J2-6. Both inputs are only compatible with high-side current
sources.
Figure 32
Wiring Examples for ECLS and ECWS
Chilled Water Reset (CWR)
CH530 resets the chilled water temperature set point based on either return water
temperature, or outdoor air temperature. Return Reset is standard, Outdoor Reset is
optional.
CH530 resets the chilled water temperature set point based on either return water
temperature, or outdoor air temperature. Return Reset is standard, Outdoor Reset is
optional.
The following shall be selectable:
•
One of three Reset Types: None, Return Water Temperature Reset, Outdoor Air
Temperature Reset, or Constant Return Water Temperature Reset.
Temperature Reset, or Constant Return Water Temperature Reset.
•
Reset Ratio Set Points.
For outdoor air temperature reset there shall be both positive and negative reset
ratio's.
ratio's.