Final Refrigerant Charge; Startup Procedure; Instructions - Trane Technologies IntelliPak Signature SCWF Installation, Operation And Maintenance Manual

Start-up
NOTICE
Compressor Damage!
Failure to follow instructions below could result in
compressor damage.
Improper power phasing will cause compressor to run
backwards. Compressor could be running backwards
if it is noisy, low side shell gets hot, suction pressure
does not drop within 5 seconds after startup, and
compressor only draws ½ expected amps. Stop the
compressor immediately and have a qualified
electrician or technician properly trained in 3 phase
power correct the wiring.
WARNING
Rotating Components!
Failure to disconnect power before servicing could
result in rotating components cutting and slashing
technician which could result in death or serious
injury.
During installation, testing, servicing and
troubleshooting of this product it may be necessary
to work with live and exposed rotating components.
Have a qualified or licensed service individual who
has been properly trained in handling exposed
rotating components, perform these tasks.
15. Allow 10 minutes for circuit operation to stabilize at full
load.
16. Complete charging, if required.

Final Refrigerant Charge

If full charge was not used during installation, follow these
steps:
1. Determine remaining charge required by subtracting
charge added during "Preliminary Refrigerant
Charging," p. from the total.
2. With all circuit compressors running, SLOWLY meter
remaining R-410A into the suction line from the LIQUID
charging connection.
NOTICE
Compressor Damage!
Overcharging system could result in compressor
failure and/or reduced compressor life.
Do not overcharge system. Excessive refrigerant
charging can cause compressor liquid slugging at
startup, and conditions where compressors and/or
condenser fans short cycle.
74
NOTICE
Compressor Damage!
Failure to follow instructions below could result in
compressor failure and/or reduced compressor life.
To prevent compressor liquid slugging, only add
liquid in the suction line when the compressor is
running. Use extreme caution to meter liquid
refrigerant into the suction line slowly. If liquid is
added too rapidly, compressor oil dilution and oil
pumpout could occur.
3. Use an accurate scale to measure and record amount
of R-410A added.
4. After unit has been operating for approximately 30
minutes at full load, measure and record operating
pressures.
5. Repeat for other circuits.
6. Confirm, and adjust charge, if necessary, by checking
subcooling at AHRI 340/360 full load operating
conditions (80°/67°F db/wb entering evaporator, ~300
cfm/ton, 85°/95°F EWT/LWT).
Water-cooled subcooling should be 8-10°F.

Startup Procedure

Using the startup log on the following pages, establish
nominal conditions for consistent measurements as
follows:
• Leaving air greater than 60°F
• Entering air temperature = 70 to 90°F
• Entering water temperature > 60°F
With all compressors running at full load:
1. Compute superheat from the suction line pressure and
temperature at the compressor on each circuit. Adjust
the thermal expansion valve settings if necessary.
Superheat should be between 14 and 20°F.
2. Inspect refrigerant flow in the liquid line sight glass.
Flow should be smooth and even, with no bubbles once
the system has stabilized.
Note: Sight glass moisture indicator may show caution
or wet at startup. May need up to 12 hours of
operation for system to reach equilibrium and
correctly show moisture.
Normal startup will occur provided that Tracer™ Summit is
not controlling the module outputs or the generic BAS is not
keeping the unit off. To prevent Tracer Summit from
affecting unit operation, remove Tracer wiring and make
required changes to setpoint and sensor sources.
Operating and Programming Instructions
See Self-Contained Programming Guide, PKG-SVP01*-
EN, for available unit operating setpoints and instructions.
A copy ships with each unit. For units with VFD option, see
installer guide that ships with each VFD.
SCXF-SVX01T-EN