When replacing Copleand compressors in Armstrong units, it is sometimes necessary to use a compressor plug to adapt the compressor to the unit. There are different plugs for condensers, heat pumps and packaged units.
Compressor Plugs
Locke#
Copeland Code
Plug
Armstrong part no.
Application
L0803
CR22K6-PFV
L4740
42725-001
Condenser & Heat Pump
L4683
CR28KF-PFV-130
L4740
42725-001
Condenser & Heat Pump
L4684
CR34KF-PFV-130
L4740
42725-001
Condenser & Heat Pump
L4725
ZR28KC-PFV-130
L4740
42725-001
Condenser & Heat Pump
L5766
ZR57KC-TF5
L4744
42725-005
Packaged Unit
L5767
ZR72KC-TF5
L4744
42725-005
Packaged Unit
Here is a list of criteria to help you determine which plug a Copeland Compressor needs. Note that there are variations that don t fit these criteria.