Unit installation

Start-Up
76 SCXF-SVX01K-EN
14. As soon as a compressor starts, verify correct rotation.
If a scroll compressor is allowed to run backwards for
even a very short period of time, internal compressor
damage could occur and compressor life could be
reduced.When rotating backwards scroll compressors
make a loud noise, do not pump, and draw about 1/2
expected amps, and low side shell gets hot.
Immediately shut off a compressor rotating backwards
and correct wiring.
15. Air
Cooled Only: Check condenser fans for proper
rotation. From top of unit, correct rotation direction is
clockwise. If running backwards, correct wiring
.
16. After 10 minutes, start second compressor of manifold
circuits.
17. Allow 10 minutes for circuit operation to stabilize at full
load.
18. 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. 35 from the total.
2. With all circuit compressors running, SLOWLY meter
remaining R-410A into the suction line from the LIQUID
charging connection.
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.
• Air
Cooled Only: Operating pressure
measurement must be made with all condenser
fans running.
Repeat for other circuits.
Start-up 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:
5. 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.
6. 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 start-up. May need up to 12 hours of
operation for system to reach equilibrium and
correctly show moisture.
Normal startup will occur provided thatTracer Summit is
not controlling the module outputs or the generic BAS is
not keeping the unit off.To preventTracer Summit from
affecting unit operation, removeTracer wiring and make
required changes to setpoint and sensor sources.
NOTICE:
Compressor Damage!
Improper power phasing could cause the compressor to
run backward. Compressor could be running backward
if it is noisy, low side shell gets hot, suction pressure
does not drop within 5 seconds after startup and
compressor only draws half of the expected amps. Stop
the compressor immediately and have a qualified
electrician or technician properly trained in 3-phase
power correct the wiring. Failure to do the above could
result in compressor damage.
WARNING
Rotating Components!
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. Failure to follow all
safety precautions could result in rotating components
cutting and slashing technician which could result in
death or serious injury.
NOTICE:
Compressor Damage!
Do not overcharge system. Excessive refrigerant
charging can cause compressor liquid slugging at
startup and compressor (and/or condenser fans short
cycle). Overcharging could result in compressor failure
or reduced compressor life.
NOTICE:
Compressor Damage!
Avoid compressor liquid slugging. Only add liquid in
the suction line when the compressor is running. Use
extreme caution to meter liquid refrigerant in to the
suction line slowly. If liquid is added too rapidly,
compressor oil dilution and oil pump out could occur.
Failure to follow the above could result in compressor
failure or reduced compressor life.