Page 57
XP21
APPLICABLE TO ALL VERSIONS
Compressor Information and Testing
The XP21 uses either a ZPSK4 or ZPSK5 depending on model number. See table 25 for applicable compressor use by
model number.
ELECTRICAL CHARACTERISTICS
Table 24 provides information concerning the electrical characteristics of both the ZPSK4 and ZPSK5 (single−phase).
Table 25. Compressor Electrical Characteristics Comparison
Lennox Model
Lennox
Compressor
Part Number
Copeland Model Voltage Phase LRA RLA
Minimum
Circuit
Ampacity
Max Fuse
/ Ckt Bkr
Run
Capacitor
Start Kit
XP21−024−230−01 thru −04 100504−01 ZPS20K4E−PFV
208/230 1
52 10.3 14.9 25 35/5 370 63W22
XP21−024−230−05 103137−01 ZPS20K5E−PFV 58.3 11.7 20 25 35/5 440 10J42
XP21−036−230−01 thru −03 100504−02 ZPS30K4E−PFV 82 16.7 22.9 35 40/5 440 63W23
XP21−036−230−04 103137−02 ZPS30K5E−PFV 83 15.3 21.1 35 40/5 440 10J42
XP21−048−230−03 100504−03 ZPS40K4E−PFV 96 21.2 28.5 45 45/10 440 10J42
XP21−048−230−04 103137−03 ZPS40K5E−PFV 104 21.2 28.5 45 30/5 440 12J90
XP21−060−230−03 100504−14 ZPS49K4E−PFV 118 23.1 30.9 50 80/7.5 440 63W24
XP21−060−230−04 103137−04 ZPS49K5E−PFV 153 28.8 38 60 40/5 440 12J90
ELECTRICAL CHARACTERISTICS
External mechanical differences between the ZPS*K4 and ZPS*K5 are minimal. The suction and discharge tube height dif-
ferences are less than 0.75". The ZPS40K5 compressor is 0.50" taller than the ZPS40K4. All other ZPS*K5 compressors are
shorter than the equivalent ZPS*K4 compressor. The mounting configuration is the same for both compressor families. The
compressor frame sizes are different and a smaller crankcase heater may be required. In addition, there are difference sin
mounting grommets because of the different frame sizes.
K4 COMPRESSOR MODULATING SOLENOID
These
controls
convert
the
24
volt
AC
power
to
24
Volt
DC.
The
solenoid
is
pulled
in
with
24
volts
DC
and
then
the
coil
is
held
in
by
pulsing
the
voltage
between
6
and
18
volts
DC.
SOLENOID PLUG (24VDC INPUT)
SOLENOID PLUG (24VDC INPUT /
24VDC OUTPUT)
This
control
outputs
24VAC
on
Y2
and
OUT.
The
plug
on
the
compressor
has
a
rectifer
that
converts
the
24VAC
to
24VDC.
The
solenoid
is
pulled
in
with
24VDC.
Figure 27. K4 Compressor Modulating Solenoid
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