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TABLE 9—TWO-SPEED COMPRESSOR
(WINDING RESISTANCE AT 70°F ± 20°)
WINDING
3 TON
T1-T2
0.80
T1-T3
3.20
T1-T7
1.30
T1-T8
3.10
MECHANICALLY INTERLOCKED CONTACTORS
The 2-speed products are equipped with mechanically interlocked
contactors. Each contactor has interconnecting linkage, providing
independent interlocks.
The 2-speed control provides the electrical interlock. The contac-
tors are supplied with 240-v coils, which reduce the va require-
ments of low-voltage (24-vac) control system.
TEMPERATURE THERMISTORS
Thermistors are electronic devices which sense temperature. As
the temperature increases, the resistance decreases. A thermistor is
used to sense outdoor ambient. Refer to Fig. 12 for resistance
values versus temperature.
If the outdoor ambient thermistor should fail, a malfunction signal
appears on indoor thermostat and 2-speed control. The control
does not initiate second-stage latching, and crankcase heater is
turned on during all off cycles.
XIII. FINAL CHECKS
IMPORTANT: Before leaving job, be sure to do the following:
1. Securely fasten all panels and covers.
2. Tighten service valve stem caps to 1/12-turn past finger
tight.
Packaged Service Training programs are an excellent way to increase your
knowledge of the equipment discussed in this manual, including:
A large selection of product, theory, and skills programs is available, using popular
video-based formats and materials. All include video and/or slides, plus companion
book.
Classroom Service Training plus "hands-on" the products in our labs can mean
increased confidence that really pays dividends in faster troubleshooting, fewer
callbacks. Course descriptions and schedules are in our catalog.
[ ] Packaged Service Training
© 1998 Bryant Heating & Cooling Systems 7310 W. Morris St. Indianapolis, IN 46231
4 TON
5 TON
0.70
0.60
2.20
1.80
1.00
1.00
2.20
2.00
SERVICE TRAINING
• Unit Familiarization
• Installation Overview
CALL FOR FREE CATALOG 1-800-962-9212
THERMISTOR CURVE
90
80
70
60
50
40
30
20
10
0
0
20
Fig. 12—Resistance Values Versus Temperature
3. Leave User's Manual with owner. Explain system operation
and periodic maintenance requirements outlined in manual.
4. Fill out Dealer Installation Checklist and place in customer
file.
CARE AND MAINTENANCE
For continuing high performance and to minimize possible equip-
ment failure, periodic maintenance must be performed on this
equipment.
Frequency of maintenance may vary depending upon geographic
areas, such as coastal applications.
• Maintenance
• Operating Sequence
[ ] Classroom Service Training
—16—
Printed in U.S.A.
40
60
80
100
TEMPERATURE (DEG. F)
A94328
598a367
Catalog No. 5359-803
120
A91431
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