Trane RAUL 190, Manual, Page: 7 / 24

7 RAU-SVX01G-GB
Installation
Insulation of refrigerant lines
Insulate refrigerant lines from building itself to avoid transmission to building structure of vibrations normally
caused by pipework.
Also avoid bypassing the unit’s damping system by fi xing the refrigerant lines or the electrical ducts very rigidly.
Vibrations may propagate into building structure through rigidly fi xed refrigerant lines.
Pressure tests. Leak detection
During operations, take the following precaution:
1. Neither oxygen nor acethylene should be used instead of refrigerant and nitrogen to detect leaks, otherwise a
violent explosion may occur.
2. Always use valves and manometers to check the test pressure in system. Excessive pressure may either cause
pipes to rupture, damage unit, or cause an explosion, causing possible physical injury.
Carry out liquid line and hot gas line pressure tests in accordance with current standards.
The test pressures applied to the liquid line and the hot gas suction line must comply with the country’s standards.
Caution: Do not go more than 0.7 bar above the high pressure switch setpoint.
Introduce enough refrigerant into circuit in order to obtain a pressure of 85 to 100 kPa. Search for possible leaks
using detector. This operation should be carried out with great care throughout the system.
If leaks are detected, pump down the refrigerant, and repair defective component. Repeat test process, to check that
the repair can withstand rated pressure.
Refrigerant charge (all split system types)
Units ship with a nitrogen holding charge and isolating valves.
After system pressure and vacuum testing, fi ll up unit with refrigerant. The refrigerant complement will be charged
according to the diameter and the length of the refrigerant piping work up to obtain the correct superheat and
subcooling temperatures.
Oil charge
The oil quantity necessary for the split system has also to be adjusted according to the diameter and the length of
the refrigerant piping work.
Important note: These operations have to be performed by a specialist according to the rules of the art. The results
have to be written on a start up record by the Trane engineer or the client’s specialist who has performed this start
up. The quantity of refrigerant and oil added are at the client’s charges.