Wine Guardian 99H0204-20, Installation, Operation And Maintenance Manual

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issues related to oil management that can impair performance and jeopardize the
compressor’s lubrication.
•
Provide a
½” (12.7mm) pitch in suction and liquid line toward the condensing unit for
every 10 ft (3 meters) of run to prevent any refrigerant that condenses in the suction
line from flowing to the compressor when the unit is off. These two lines can be routed
together and wrapped together, as long as the suction line is fully insulated, as
previously directed.
•
Suction line riser traps are not required if the riser is properly sized to maintain
refrigerant velocity. Adding a trap will only increase pressure drop.
•
Prevent dips, sags, or other low spots that will trap refrigerant oil, which is an issue
especially with long horizontal runs. Use hard refrigerant copper for longer horizontal
runs to prevent potential oil return problems. (See sample piping chart on page 27)
•
When sweat connections are made in the connecting lines, be sure that the inside of
the tubing is clean before installing the unit. Use a dry nitrogen bleed during brazing.
Note : that compressor suction and discharge valves should be open to the
atmosphere no longer than 15 minutes. Compressors with POE (polyolester) oil will
quickly become contaminated when opened to atmosphere.
Refrigerant Line-Sets
60Hz
Model # Liquid
Line (OD)
Liquid
connection
at
Evaporator
(OD)
Suction
Line (OD)
Suction
connection
at
Evaporator
(OD)
Min.
Suction
Line
Insulation
Thickness
Maximum
“total” Line
Length
Maximum
Lift
(height)
SP25 1/4
”
1/4
” 3/8” 3/8” 3/8” 50’ 15’
Note :
•
Line lengths are expressed in equivalent feet = actual run fitting allowances
(i.e.,
~5’ (12.7 cm) for each bend/elbow allowance).
•
Use only refrigeration-grade dehydrated tubing.
•
Install refrigeration piping per local codes and ASHRAE guidelines.