Trane Rtaaiom3 Manual

81RTAA-IOM-3
Figure 41
(Continued from Previous Page)
1 Schrader valve
2 Suction temperature sensor*
3 Manufacturing process tube
4 Suction service valve (optional)
5 Motor winding thermostat*
6 Discharge temperature sensor
7 Pressure relief valve (450 psi)
8 High pressure cutout (405 psi)*
9 Discharge check valve
10 Evaporator waterside vent
11 Discharge line shutoff valve
12 Oil separator in/out cap
13 Saturated condensing temperature
sensor*
14 Condenser header
15 Subcooler header
16 Liquid line...

82RTAA-IOM-3
Figure 43
RTAA Compressor Oil System
Schematic
Oil System Operation
Overview
Oil that collects in the bottom of the oil
separator is at condensing pressure
during compressor operation;
therefore, oil is constantly moving to
lower pressure areas. Refer to
Figure 43.
As the oil leaves the separator, it passes
through the air-cooled oil cooler at the
top of the condensing coils. It then
goes through the service valve and
filter. At this point, some of the oil is
used to control the slide valve...

83RTAA-IOM-3
Oil Separator
The oil separator consists of a U-
shaped tube, joined at the top by the
refrigerant discharge line from the
compressor. As shown in Figure 44, the
discharge line is essentially tangential
to the U-tubes. This causes the
refrigerant to swirl in the tubes and
throws the oil to the outside, where it
collects on the walls and flows to the
bottom. The compressed refrigerant
vapor, stripped of oil droplets, exits out
the top of the oil separator and is
discharged into the condensing...

84RTAA-IOM-3
Slide Valve Movement
Movement of the slide valve piston
determines slide valve position which,
in turn, regulates compressor capacity.
Oil flow into and out of the cylinder
governs piston movement, and is
controlled by the normally-closed, load
and unload solenoid valves.
The solenoid valves receive
momentary pulsating “load” and
“Unload” voltage signals from the
UCM based on system cooling
requirements. 
To load the compressor,
the UCM opens the load solenoid valve
while keeping the unload...

85RTAA-IOM-3
Figure 45
Fan Configurations – RTAA 130-200 Tons
15 F Minimum Ambient
All fans will be Full Airflow (Full Pitch Blade) Fans:
Circuit #1 is on the right side of the unit from the control panel.
Circuit #2 is on the left side of the unit from the control panel.
# Of Fans # Of Fans UCM  Outputs
Tons Circuit #1 Circuit #2 Per Circuit # Fan Steps/Circuit
130 5 5 4 5 & 5 respectively
140 5 5 4 5 & 5 respectively
155 6 5 4 6 & 5 respectively
170 7 5 4 7 & 5 respectively
185 7 6 4 7 & 6...

86RTAA-IOM-3
Figure 46
Fan Configurations - RTAA 130-400 Tons - 0 F Minimum Ambient
The 0 F AMBIENT OPTION will have Half Airflow (Half Pitch Blade) Fan.
# Of Fans # Of Fans UCM  Outputs
Tons Circuit #1 Circuit #2 Per Circuit Fan Steps/Circuit
130 5* 6* 4 9 & 10 respectively
140 5* 6* 4 9 & 10 respectively
155 6* 6* 4 10 & 10 respectively
170 7* 6* 4 11 & 10 respectively
185 7* 7* 4 11 & 11 respectively
200 7* 7* 4 11 & 11 respectively
215 7* 7* 4 11 & 11 respectively
240 10** 7* 4 9 & 11 respectively...

87RTAA-IOM-3
Operating Principles –
Adaptive Control
™
Microprocessor Logic
General
The exclusive Trane Adaptive Control
logic is comprised of a system of
individual modules called the Unit
Control Module (UCM), located in the
Control Panel. The system consists of
four types of microprocessor-based
components and the operator interface,
as shown in Figures 47 thru 51. The
processors are:
Chiller Module (Base or Deluxe) - 1U1
Communication and Setpoint Reset
Option Module - 1U2
Expansion Valve Module -...

88RTAA-IOM-3
Figure 47
RTAA Control Panel –
130 to 200 Tons
LEGEND:
Device
Designation Description
1F1-6 Fan Fuses, Circuit 1
1F7-12 Fan Fuses, Circuit 2
1F15 Control Circuit Fuse
1F16, 1F17 Control Power
Transformer Fuses
1K1, 1K5 Start Contactors
1K2, 1K6 Run Contactors
1K4, 1K8 Transition  Contactors
1K3, 1K7 Shorting  Contactors
1K9-12 Fan Contactors, Circuit 1
1K13-16 Fan Contactors, Circuit 2
1S1, 1S2 Non-fused  Disconnect
Switch
1T1 Control Power
Transformer
1T2 Under/Over Voltage
Transformer...

89RTAA-IOM-3
Figure 48
RTAA Control Panel –
240 to 300 Tons
LEGEND:
Device
Designation Description
1F1-6 Fan Fuses, Circuit 1
1F7-12 Fan Fuses, Circuit 2
1F15 Control Circuit Fuse
1F16, 1F17 Primary  Transformer
Fuses
1K1, 1K2 Start Contactors, Circuit 1
1K3, 1K4 Start Contactors, Circuit 2
1K9-12 Fan Contactors, Circuit 1
1K13-16 Fan Contactors, Circuit 2
1S1, 1S2 Non-fused  Disconnect
Switch
1T1 Control Power
Transformer
1T2 Under/Over Voltage
Transformer
1T3-8 Compressor Current
Transformer, Circuit...

90RTAA-IOM-3
Figure 49
RTAA Control Panel –
340 to 400 Tons
LEGEND:
Device
Designation Description
1F1-6 Fan Fuses, Circuit 1
1F7-12 Fan Fuses, Circuit 2
1F15 Control Circuit Fuse
1F16, 1F17 Primary  Transformer
Fuses
1K1, 1K2 Start Contactors, Circuit 1
1K3, 1K4 Start Contactors, Circuit 2
1K9-12 Fan Contactors, Circuit 1
1K13-16 Fan Contactors, Circuit 2
1S1, 1S2 Non-fused  Disconnect
Switch
1T1 Control Power
Transformer
1T2 Under/Over Voltage
Transformer
1T3-8 Compressor Current
Transformer, Circuit...