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Manual 2100-738A
Page
66 of 71
COMPRESSOR SOLENOID
A nominal 24-volt direct current coil activates the
internal compressor solenoid. The input control
circuit voltage must be 18 to 28 volt ac. The coil
power requirement is 20 VA. The external electrical
connection is made with a molded plug assembly.
This plug contains a full wave rectifier to supply direct
current to the unloader coil.
Compressor Solenoid Test Procedure
–
If it is suspected
that the unloader is not working, the following methods
may be used to verify operation.
1. Operate the system and measure compressor
amperage. Cycle the compressor solenoid on
and off at 10-second intervals. The compressor
amperage should go up or down at least 25%.
2. If Step 1 does not give the expected results, shut
unit off. Apply 18 to 28 volt ac to the solenoid
molded plug leads and listen for a click as the
solenoid pulls in. Remove power and listen for
another click as the solenoid returns to its original
position.
3. If clicks can’t be heard, shut off power, remove the
control circuit molded plug from the compressor and
measure the solenoid coil resistance (see Table 17).
4. Next, check the molded plug.
Voltage Check
: Apply control voltage to the plug wires
(18 to 28 volt ac). The measured
dc
voltage at the
female connectors in the plug should be around 15 to
27 vdc.
Resistance Check
: Measure the resistance from the end
of one molded plug lead to either of the two female
connectors in the plug. One of the connectors should
read close to 0 ohms, while the other should read
infinity. Repeat with other wire. The same female
connector as before should read zero, while the other
connector again reads infinity. Reverse polarity on the
ohmmeter leads and repeat. The female connector that
read infinity previously should now read close to 0 ohms.
Replace plug if either of these test methods does not
show the desired results.
TABLE 17
Solenoid Coil Resistance
Compressor Model
Solenoid Ohms
ZPS***K4
33.6 Ω
ZPS***K5
350 Ω or 1640 Ω
ZPS***K6
1640 Ω
Summary of Contents for Q-TEC Series
Page 16: ...Manual 2100 479 Page 6 of 11 FIGURE 1 TYPICAL AIR CONDITIONING SYSTEM COOLING CYCLE MIS 369...
Page 17: ...Manual 2100 479 Page 7 of 11 FIGURE 2 TYPICAL HEAT PUMP SYSTEM COOLING CYCLE MIS 368...
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Page 92: ...Manual 2100 738A Page 60 of 71 FIGURE 36 Water Source Heat Pump Cooling Cycle...
Page 93: ...Manual 2100 738A Page 61 of 71 FIGURE 37 Water Source Heat Pump Heating Cycle...
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Page 125: ...Manual 2110 1558 Page 14 of 23 OPTIONAL CLIMATE CONTROLS SEXP 560 3 2 1...
Page 127: ...Manual 2110 1558 Page 16 of 23 OPTIONAL CLIMATE CONTROLS 1 3 2 4 SEXP 639 5...
Page 129: ...Manual 2110 1558 Page 18 of 23 OPTIONAL CLIMATE CONTROLS 6 4 2 3 1 5 SEXP 646...
Page 131: ...Manual 2110 1558 Page 20 of 23 OPTIONAL CLIMATE CONTROLS SEXP 645 4 3 2 5 6 1...
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