Unit installation

Installation - Mechanical
SCXF-SVX01K-EN 35
Preliminary Refrigerant Charging
To charge the system:
1. Verify system leak check (including interconnecting
piping for air cooled systems) and evacuation are
complete before adding refrigerant. See “Refrigerant
LeakTest Procedure,” p. 84 and “System Evacuation
Procedures,” p. 86 in Maintenance section
2. Ensure field supplied unit disconnect is "OFF". Verify
that the unit 115 volt control circuit switch is "OFF" and
reset relays have been unplugged, to prevent
inadvertent compressor starts.
3. Turn field supplied unit disconnect "ON" to energize
crankcase
heaters. Verify crankcase heaters are
operating.
4. Verify all service valves are open.
5. See CSC General data Table 1, p. 11 , Table 2, p. 12 or
Table 5, p. 14 for unit refrigerant charge.
6. See Table 25, p. 36 for additional charge required
based on field piping size and length. Add this to the
c
harge amount fromStep 5 for the total charge.
Note: Step
6 not required for field piping under 25
feet, or for water cooled system.
7. At the liquid line angle valve add as much R-410A
LIQ
UID as possible up to, but not exceeding, total
charge amount. Depending on conditions, it may not
be possible to add more than 60% of the total charge.
This will be adequate for compressor startup. More
charge will be added after compressors are started.
Use an accurate scale to measure and record
preliminary amount of R-410A added to each circuit.
• Air Cooled Only: Add charge at the condenser
access valve or field supplied discharge line access
valve. If angle valve is used for charging, liquid line
solenoid valve should be open.
WARNING
Confined Space Hazards!
Do not work in confined spaces where refrigerant or
other hazardous, toxic or flammable gas may be
leaking. Refrigerant or other gases could displace
available oxygen to breathe, causing possible
asphyxiation or other serious health risks. Some gases
may be flammable and or explosive. If a leak in such
spaces is detected, evacuate the area immediately and
contact the proper rescue or response authority. Failure
to take appropriate precautions or to react properly to
such potential hazards could result in death or serious
injury.
WARNING
Hazard of Explosion!
Use only dry nitrogen with a pressure regulator for
pressurizing unit. Do not use acetylene, oxygen or
compressed air or mixtures containing them for
pressure testing. Do not use mixtures of a hydrogen
containing refrigerant and air above atmospheric
pressure for pressure testing as they may become
flammable and could result in an explosion. Refrigerant,
when used as a trace gas should only be mixed with
dry nitrogen for pressurizing units. Failure to follow
these recommendations could result in death or serious
injury or equipment or property-only damage.
WARNING
Hazardous Pressures!
If a heat source is required to raise the tank pressure
during removal of refrigerant from cylinders, use only
warm water or heat blankets to raise the tank
temperature. Do not exceed a temperature of 150°F. Do
not under any circumstances apply direct flame to any
portion of the cylinder. Failure to follow these safety
precautions could result in a violent explosion, which
could result in death or serious injury.
CAUTION
FreezingTemperatures!
Do not allow liquid refrigerant to contact skin. If it
does, treat the injury similar to frostbite. Slowly warm
the affected area with lukewarm water and seek
immediate medical attention. Direct contact with liquid
refrigerant could cause minor or moderate injury.
NOTICE:
Compressor Damage!
If it becomes necessary to remove or recharge the system
with refrigerant, it is important that the following actions
are taken.To prevent cross contamination of refrigerants
and oils, use only dedicated R-410A service equipment.
• Disconnect unit power before evacuation and do not
apply voltage to compressor while under vacuum.
• Due to presence of POE oil, minimize system open
time. Do not exceed 1 hour.
• Allow the crankcase heater to operate a minimum of 24
hours before starting compressors.
• Do not allow liquid refrigerant to enter the suction line.
Excessive liquid accumulation in the liquid lines could
result in compressor damage.
• Do not operate the compressors without some
refrigerant in each circuit.
Failure to follow these instructions could result in
compressor failure.