Trane R Series - Interconnecting Wiring between RTUA Units and an Air-Cooled Condenser

66 RLC-SVX07A-EN
Installation - Electrical
Interconnecting Wiring between RTUA Units and an Air-Cooled
Condenser
RTCA condensers need the following interconnecting wiring from the RTUA
unit. Refer to Figure 28:
Non-RTCA condensers need the following interconnecting wiring from the
RTUA unit. Refer to Figure 29:
NOTE: If sensor leads are not long enough to make connection at RTUA,
refer to Paragraph "Sensor Connections from Non-RTCA Unit to RTWA on
Page" 74.
NOTE: Staging of the fans of a non-RTCA condenser is the responsibility of
the customer.
12 3 YES NO YES
-
RTUA 1TB9-1 to -8 to RTCA 1TB9-1 to -8, respectively, for controlling
the fan inverters.
-
RTUA 1TB6-1 to -2 to RTCA 1TB6-1 to -2, respectively, to monitor the
factory-installed outdoor air temperature sensor.
-
RTUA 1TB6-3 and -4 to RTCA 1TB6-3 and -4, respectively, to monitor
the factory-installed saturated condensing refrigerant temperature
sensor on Circuit #2.
-
RTUA 1TB6-5 and -6 to RTCA 1TB6-5 and -6, respectively, to monitor
the factory-installed saturated condensing refrigerant temperature
sensor on Circuit #1.
-
115 volt power from the RTUA 1TB4-3 to -11 to RTCA 1TB4-3 to -11,
respectively, to control the fan contactors
-
The field-installed outdoor air temperature sensor on the condenser
needs to be wired to RTUA 1TB8-1 and -2.
-
The field installed saturated condensing refrigerant temperature
sensor for circuit #2 needs to be wired to RTUA 1TB8-3 and -4.
-
The field installed saturated condensing refrigerant temperature
sensor for circuit #1 needs to be wired to RTUA 1TB8-5 and -6.
-
The 115 volt signal to start fans on Circuit #2 comes from
RTUA 1TB4-3.
-
The 115 volt signal to start fans on Circuit #1 comes from
RTUA 1TB4-7.
-
GROUND return for the 115 volt fan signal connects to RTUA 1TB4-11
Table 20 Alarm/Running/Maximum Capacity Menu Settings
Programmable
Relay Setup Setting
(Service Setting Menu)
Relays Output
Configuration
Ta b l e 1 9
Diagnostics that the Alarm
Relay(s) is Active
MMR/
CMR diag.
MAR/
CAR diag.
IFW
Notes:
MMR = Machine Manual Reset
CMR = Circuit Manual Reset
MAR = Machine Auto Reset
CAR = Circuit Auto Reset
IFW = Informational Warnings