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leak testing, as flux can seal off pinhole leaks that would
show up later.
When replacing components, all copper joints must be
joined with silver solder or Sil-Fos.
:
To check for contamination, obtain an oil sample from an
old compressor.
• If oil has burned odor, but no color change or
residue — follow instructions in section “Installing A
New Compressor” on page 14.
• If oil has burned odor and shows contamination
(dark color) or feels gritty — follow instructions in
next section, To Flush The System. Remove as
much contamination as possible from system
before installing new compressor.
The system should be flushed with dry
nitrogen. However, you must use R-22 if refrigerant
is used to flush system. This is the only refrigerant
that can be used to flush the system and it must be
recovered.
To Use Refrigerant To Flush The System:
1. Remove suction and discharge lines on compressor and
disconnect capillary tube from condenser. Connect pro-
cess coupling to outlet and inlet tube of condenser.
2. Connect hose to outlet process coupling and
charging cylinder. Connect another hose to inlet
coupling and recovery bag.
3. Open charging cylinder and allow refrigerant to flow
through condenser until discharge into bag is clear.
4. Connect process fitting to compressor suction line.
Flush evaporator and capillary tube.
: If unable to get refrigerant flow through
capillary tube, remove capillary tube from
evaporator and flush again.
5. If cap tube is blocked, replace cap tube.
6. Reassemble system.
All replacement compressors are shipped with rubber plugs in
the suction, discharge, and process tubes and contain the
correct oil charge and a holding charge of inert gas. Models with
Reciprocating Compressors have a low-side process tube
attached to the compressor shell. Models with Rotary
Compressors have a process tube on the high side of the
system soldered into the compressor discharge line
Before installing the replacement compressor, remove the
discharge plug and check for the pop sound of the inert gas
leaving the compressor.
A new compressor which is cold (e.g. after having been kept
in a cold service van) should be left to warm to the surrounding
temperature before the plugs on the compressor connections
are removed. This will help prevent condensation from forming
15
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