Compressor Handbook - Embraco

COMPRESSORS
HANDBOOK
Chapter
RUNNING DATA AND COMPRESSOR CHECKING PROCEDURES
7.4.2 Standard version RSIR - RSCR EM Series with PTC starting device
(Refer to the RSIR e RSCR electric diagrams represented on Figure 10, page 24)
Verify with a voltmeter the presence of the correct voltage on the “L” and “N” terminals of the
PTC starting device. If there is insufficient voltage, the thermostat is defective due to open contacts,
connections, or an interruption in the cables.
Disconnect the other electrical components if present (motor fan, gear motor, etc.), disconnect
the voltage to the circuit at the supply line, and carry out the following operations and checks:
1. Check the continuity on the terminals L3 of PTC starting device. If continuity lack,s the thermostat
must be replaced due to open contacts.
2. Take off the PTC starting device from the hermetic terminal.
3. If there is a run capacitor (RSCR version) disconnect it.
4. Take off the protector from the PTC starting device and check between points 1 and 3. If there
is no continuity, be sure that the protector has no open contacts due to its trip. In this case,
repeat the check after about 10 minutes. Otherwise, the protector is defective due to open contacts.
5. Check the electric motor according to the procedure described in par.7.5.1.
6. Check the ohmic resistance of the stator run and start windings according to the procedure
described in par.7.5.2.
7. On the PTC starting device check between the two fastons N and 2, the ohmic resistance of
the PTC pill which must be 8÷16 for the 230V model and 2÷4 for the 115V model, at
the ambient temperature of 25 °C. (CAUTION: the ohmic resistance values measured with a
normal tester can be out of the indicated by as much as 25% ÷ 30%).
8. If there is a run capacitor (RSCR version), check it according to the procedure described in
section 7.5.3.
If from all the above checks no problem was found, there is no capillary clogging and the system
does not yet run correctly, replace the compressor.
7.4.3 Standard version RSIR NB - NE - NT - T Series with electromagnetic
current relay
(Refer to the RSIR electric diagram represented in Figure 11, page 25)
PLEASE NOTE: The contacts of the starting relay are normally open.
Verify with a voltmeter the presence of the correct voltage on terminals “1” of relay and “3” of
protector. If there is insufficient voltage, the thermostat is defective due to open contacts, connections,
or there is an interruption in the cables.
Disconnect the other electric components if present (motor fan, gear motor, etc.), disconnect the
voltage to the circuit at the supply line, and carry out the following operations and checks:
1. Check the continuity between the points “1” - “3” of protector: If there is no continuity, be
sure that the protector has no open contacts due to its trip. In this case, repeat the check after
about 10 minutes.
2. Take off the start relay from the hermetic terminal and keeping it in the same vertical position,
(do not incline or overturn) carry out the following continuity checks.
3. Between the terminals “1” and “S” on the relay: If there no continuity the relay is faulty due
to closed contacts.
Doc. Code Emission Revision Date Page
MP01E 2000-04 0 20-02 88 - 98