Installation - Mechanical — Remote Evaporator Option
RTAC-SVX01J-EN 61
1. Use the 70 ton circuit column.
2. From the liquid line sizing example, use a field installed
liquid line of:
1.375 (1 3/8”) inches
3. The actual feet of liquid line installed is: 117 feet
4. The size of the suction accumulator is: 3 5/8 inches
5. The length of the suction line accumulator is: 59 feet
Piping Installation Procedures
The outdoor unit and the evaporator are shipped with a 25
psig holding pressure of dry nitrogen. Do not relieve this
pressure until field installation of the refrigerant piping is
to be accomplished.This will require the removal of the
temporary pipe caps.
Note: UseType L refrigerant-grade copper tubing only.
The refrigerant lines must be isolated to prevent line
vibration from being transferred to the building. Do not
secure the lines rigidly to the building at any point.
All horizontal suction lines should be pitched downward,
in the direction of flow, at a slope of 1/2 inch per 10 feet of
run.
Important: Field installed liquid line service valves are
recommended for installation. Liquid line
service valves are not provided by the
factory.
Note: Although packaged unit condensers and
evaporators are sized to hold complete refrigerant
charge, units with a remote evaporator may not
have the same capability, due to additional piping
requirements.
Refrigerant Sensors
All necessary refrigerant devices, transducers and
solenoids are factory installed and wired to the evaporator
terminal box.
Refrigerant Pressure Relief Valve
Venting
Vent pipe size must conform to the ANSI/ASHRAE
Standard 15 for vent pipe sizing. All federal, state, and
local codes take precedence over any suggestions stated
in this manual.
All relief valve venting is the responsibility of the installing
contractor.
All RTAC remote evaporator units use evaporator pressure
relief valves (see Figure 26, p. 62) that must be vented to
the outside of the building.
Relief valve connection sizes and locations are shown in
the unit submittals. Refer to local codes for relief valve vent
line sizing information.
Relief valve discharge setpoints and capacities rates are
given in Table 33, p. 62. Once the relief valve has opened,
it will re-close when pressure is reduced to a safe level.
Once opened, relief valves may have a tendency to leak
and must be replaced.
Pressure relief valve discharge capacities will vary with
shell diameter and length and also compressor
WARNING
Hazard of Explosion and Deadly Gases!
Never solder, braze or weld on refrigerant lines or any
unit components that are above atmospheric pressure
or where refrigerant may be present. Always remove
refrigerant by following the guidelines established by
the EPA Federal Clean Air Act or other state or local
codes as appropriate. After refrigerant removal, use dry
nitrogen to bring system back to atmospheric pressure
before opening system for repairs. Mixtures of
refrigerants and air under pressure may become
combustible in the presence of an ignition source
leading to an explosion. Excessive heat from soldering,
brazing or welding with refrigerant vapors present can
form highly toxic gases and extremely corrosive acids.
Failure to follow all proper safe refrigerant handling
practices could result in death or serious injury.
NOTICE:
Equipment Damage!
Do not use a saw to remove end caps, as this may
allow copper chips to contaminate the system. Use a
tubing cutter or heat to remove the end caps.
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.
NOTICE:
Equipment Damage!
Do not exceed vent piping code specifications. Failure
to comply with specifications could result in capacity
reduction, unit damage and/or relief valve damage.
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