NOTE: REFER TO THE TRANE REFRIGERATION
MANUAL FOR COMPLETE SUCTION AND
LIQUID LINE PIPING ARRANGEMENTS.
THIS MANUAL ALSO EXPLAINS EXPAN-
SION VALVE INSTALLATION AND SUPER-
HEAT SETTING.
Method of Attaching
Thermal Bulb to Suction Line
7
Final checkout
Run the unit sequentially through its stages of cooling.
Once proper unit operation is confirmed, perform these final
steps:
1.Inspect the unit for debris and/or misplaced tools and
hardware.
2.If the unit is operated immediately, be sure all valves are
in operating position.
3.Secure all panels including control panel in place.
Operation
Operating the unit
Unit operation unit initialized by turning the control circuit
switch in the control panel.
Seasonal start-up procedure
1.Perform the applicable procedures outline under << Annual
Maintenance>> in the Maintenance Section
2.Test the entire refrigerant system for leaks.
3.Close the system master disconnect switch
4.Start the system
5.Check the operation of all interlocked equipment.
6.Check oil level and operating pressures after the system
has been in operation for 15 to 20 minutes.
7.Check discharge pressure against <<Normal operating
conditions>>. If the pressure is above or below the normal
level, stop the unit and correct the cause.
8.On Scrolls, compressor sightglass oil levels may be
anywhere within the sightglass. Also 2 scrolls manifolded
together will have different levels.
Table 2 - Normal operating conditions
Ambient
Temperature (C)
25
30
40
Discharge pressure (bar)
14-17 17-19 22-25
Suction pressure (bar) 4-6 4-6 4-6
Operation / Maintenance
max. 4m
max. 4m
8 to 12m/s
4m/s
HP
LP
U-trap
4m/s
Evaporator
PIPING DETAILS OF REFRIGERANT COILS
Figure 3B
EXPANSION VALVE
CAPILLARY TUBES
SIGHT
GLASS
STRAINER
LIQUID LINE
FROM RECEIVER
EXPANSION
VALVE
SOLENOID
LIQUID VALVE
EXPANSION
VALVE
EXPANSION VALVE
THERMAL BULBS
EXPANSION VALVE
EQUALIZER LINES
SUCTION LINE
TO COMPRESSOR
Figure 3A
Maintenance
The following maintenance are given as an essential part of
the required maintenance of this equipment. However the
services of a qualified services technician are required to
perform the periodic maintenance procedures as part of a
regular maintenance contact. Perform all maintenance
procedures at the scheduled intervals. This will prolong the
life of the unit and reduce the possibility of costly equipment
failure. Use an <<operator’s log>> to record a weekly
<<operator condition history>> for this machine. The operating
log for this unit can be a valuable diagnostic tool for service
personnel also, the operator, by noticing trends in the operating
conditions can often foresee and prevent problem situations
before they become serious. It may be required for inspection
in the event of warranty claim.
Weekly maintenance
1. Check the compressor oil level. The oil should cover 1/2
of the sight glass when running at full load. Before oil
is added allow the compressor to run continuously for 3-
4 hours. Check the oil level every 30 minutes. If the level
does not return to cover 1/2 of the sight glass contact a
qualified service technician.
2. Trane approved compressor oil:
Trane oil 015E.(R22 refrigerant)
Note:
The lubricating oils recognised by Trane have been
subjected to extensive testing in out laboratories and
have been found to give the required satisfactory results
for use with Trance compressors.
The use of any oil not conforming to Trane required
standard is at the sole responsibility of the user and
could result in warranty cancellation.
Manifolded Suction Headers
Figure 3C
