Installation - Trane RTRA Series Installation Operation & Maintenance

The RTRA series features Trane's exclusive Adaptive Con-
trol logic, which monitors the control variables that govern
the operation of the chiller unit. Adaptive Control logic can
correct these variables, when necessary, to optimize oper-
ational effiencies, avoid chiller shutdown, and keep pro-
ducing chilled water. An optional remote display is avail-
able to monitor unit operation from a remote location.
Compressor unloaders are solenoid actuated and oil pres-
sure operated. Each refrigerant circuit its provided with an
operating charge of refrigerant and oil, filter drier, elec-
tronic expansion valve, and charging valves.
The evaporator is fully insulated, has heat tape protection
(option), and is equipped with water drain and vent con-
nections.
Unit description
The RTRA units are on compressor, helical-rotary type, air-
cooled liquid chillers designed for installation indoors.
Compressor circuits are completely assembled hermetic
packages that are factory-piped, wired, leak-tested, dehy-
Installation responsibilities
Generally, the contractor must do the following when
installing an RTRA units :
1. Install unit on a flat foundation, level (within 1/4" [6mm]),
and strong enough to support unit loading.
2. Install unit per the instructions contained in the instal-
lation-mechanical and installation-electrical sections of
this manual.
3. Install any optional sensors and make electrical con-
nections at the UCM-CLD.
Note : The air ambient temperature sensor (6R3), has to
be field installed. It should be set in the inlet condenser
air flow.
4. Where specified, provide and install valves in water
piping upstream and downstream of evaporator water
connections to isolate the evaporator for maintenance,
and to balance/trim system.
5. If desired, supply and install flow switches in the chilled
water piping; interlock each switch proper pump starter
to ensure unit can only operate if water flow is estab-
lished. Chilled water protection is provided by the UCM-
CLD without the need for a chilled water flow switch. A
flow switch for chilled water is strictly discretionary.
6. Furnish and install pressure gauges in inlet and outlet
pipings of the evaporator.
7. Furnish and install a drain valve to the bottom of the
evaporator.
8. Install a strainer in the entering water line, to prevent
water-born debris from entering the system.
9. Where specified, furnish and install strainers ahead of
all pumps and automatic modulating valves.
10. Provide and install field wiring.
11. Start unit under supervision of a qualified service tech-
nician.
12. Install heat tape and insulate the chilled water lines and
any other portions of the system, as required, to prevent
sweating under normal operating conditions or freez-
ing during low ambient temperature conditions.
drated, charged, and tested for proper control operation
before shipment.
Figures 1 thru 3 show a typical RTRA unit and its compo-
nents. Table 1 contains RTRA general data
Warnings and cautions
Warnings and Cautions appear in boldface type at appro-
priate points in this manual.
Warnings are provided to alert personnel to potential
hazards that can result in personal injury or death; they
do not replace the manufacturer's recommendations.
Cautions alert personnel to conditions that could result
in equipment damage.
Your personal safety and reliable operation of this machine
depend upon strict observance of these precautions. The
Trane Company assumes no liability for installation or ser-
vice procedures performed by unqualified personnel.

Installation

Important : All relief valve venting is the responsibility
of the installing contactor.
Nameplates
The RTRA «unit» nameplates are applied to the exterior
and interior surface of the Control Panel door (figure 4). A
«compressor» nameplate is located on the compressor.
Unit Nameplate
The «unit» nameplate provides the following information :
- Model number
- Serial number
- Month/year
- Compressor quantity
- Fan quantity
- Volt/Hertz/phase
- Full load amp
- Max. kW
- Auxiliary
- Control
- Starting amps
- Rated load amp
- High pressure
- Low pressure
- Refrigerant
- Oil
- Max. working pressure
- European Community marking (CE)
7