Contractor
Service Tips
Tip C
2
a rd
Single Phase Burns
Extensive Copeland testing and field experience has
proven that single phase motor burns are caused by
the malfunction or misapplication of the system
contactor(s).
Contactors play a role in any compressor overload
protection scheme, but are particularly important
when they are part of a pilot-operated protection
system.
Contactors have a limited life and should be
inspected during routine maintenance and replaced
every time a compressor is installed.
The Copeland warranty does not extend to external
electrical components furnished by others, and the
failure of such components resulting in compressor
failure will be taken into consideration by Copeland in
determining the warranty status of returned
compressors.
Please refer to Copeland Contactor Application
Specifications on the back of this card for additional
information.
Copeland Contactor Application Specifications
The followingContactor
Copeland Contactor
Application
Specifications are
Selection
Guide
based on contactor ratings as listed with U.L.
Copeland Contactor Application Specifications
A. The
Thefollowing
contactor
must meet
the operational
test criteriaare
in
Copeland
Contactor
Applicationand
Specifications
ARI (Air Conditionings
and Refrigeration
Institute)
based on contactor
ratings as listed
with U.L.Standard
780-78,
“Standard
Formeet
Definite
Purpose Contactors.”
A.
The contactor
must
the operational
and test criteria in
B. The
contactor
must be certified
by the manufacturer
to close
ARI
(Air Conditionings
and Refrigeration
Institute) Standard
at 780-78,
80% of the
lowestFor
nameplate
voltage Contactors.”
at normal room
“Standard
Definite Purpose
temperatures
(166
Volts
for contactors
used on 208/230
Volt
B.
The contactor
must
be certified
by the manufacturer
to close
rated
equipment).
at 80%
of the lowest nameplate voltage at normal room
C. Ontemperatures
single contactor
the rating
contactor
(166 applications,
Volts for contactors
used of
onthe
208/230
Volt
forrated
bothequipment).
full load amperes and locked rotor amperes (LRA)
must
be greater
than applications,
the corresponding
nameplate
amperage
C.
On single
contactor
the rating
of the contactor
rating
of the
motor
RLA, plus
nameplate
for both
fullcompressor
load amperes
and locked
rotorthe
amperes
(LRA)
amperage
ratingsthan
of any
or other accessories
must be greater
thefans
corresponding
nameplatealso
operated
through
contactor.
amperage
rating the
of the
compressor motor RLA, plus the
amperage
ratings ofeach
any fans
or othermust
accessories
D. Fornameplate
two contactor
applications,
contactor
have a
also
operated
through
therating
contactor.
part
winding
locked
rotor
equal to or exceeding the
half
locked applications,
rotor rating of
thecontactor
compressor.
D.
Forwinding
two contactor
each
must have a
locked
rotor
rating than
equal50%
to orofexceeding
the
Sincepart
half winding
the winding
LRA
is larger
the compressor
half winding
lockeddefinite
rotor rating
of thecontactor
compressor.
full winding
LRA, some
purpose
manufacturhalf the
winding
LRA isfor
larger
50% of the
compressor
ersSince
oversize
their
contactors
twothan
contactor
applications.
full winding
LRA,
some definite
purpose contactor
manufacturCheck
with the
contactor
manufacturer
to determine
if larger
ers oversize
contactors
for two contactor
applications.
contactors
aretheir
needed
for two-contactor
applications.
Check with the contactor manufacturer to determine if larger
contactors are neededTime
for two-contactor
Delay Relaysapplications.
Delay Relays
For part winding startTime
applications,
a time delay relay is
required
between
contactors
with a setting
1 second
For part
winding
start applications,
a timeof
delay
relay isplus or
minus
1/10between
second.contactors
The operation
a delayofrelay
can be
required
with aofsetting
1 second
plus or
affected
by low
voltage.
minus 1/10
second.
The operation of a delay relay can be
In order by
to low
insure
reliability, time delay relays listed as meeting
affected
voltage.
Copeland
specifications
for nominal
208/230
control
In order
to insure reliability,
time delay
relaysVolt
listed
as meeting
systems
must
be guaranteed
by the 208/230
manufacturer
to function
Copeland
specifications
for nominal
Volt control
properly
170 be
Volts
in a –40°by
ambient.
systemsatmust
guaranteed
the manufacturer to function
properly at 170 Volts in a –40°F ambient.
ForFor
information
see AE
AEBulletin
Bulletin10-1244
10-1244.
informationon
ontime
timedelay
delay relays,
relays, see
.
Form No. 2000DS-67 R2 Issued 1/06
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© 2006 Emerson Climate Technologies. Printed in the USA.