Table of Contents
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A. QUICK TEST STEPS 1 - 15: UNIT CONFIGURATION
— Microprocessor in unit control system is programmed by
2 switch assemblies located on processor board (Fig. 19).
Configuration header is factory set and cannot be changed in
the field. The DIP switch assembly contains 8 microswitches
that must be set in accordance with various options and
accessories selected. As shipped from factory, all DIP switches
except those controlling pull-down option (switch no. 3) and
compressor unloaders (switch no. 7 on 30GT080-330, and
360B 50 Hz units) are in OFF position. Switch no. 8 is in
OFF position for water units, and ON position for brine
units. All DIP switches should be checked and set to proper
position for options selected during quick test.
The DIP switch assembly, functions, and display codes
are shown in Fig. 19 and in Tables 8 and 9. Refer to Controls
and Troubleshooting literature for details.
B. QUICK TEST STEPS 16 - 30: THERMISTORS AND
SET POINT POTENTIOMETERS — In these steps, micro-
processor checks resistance values of all sensors and set point
potentiometers to ensure they are functional and set within
proper range for unit configuration.
Nominal resistance values for all sensors range from 363,000
to 216 ohms. Normal display code for good sensors and
potentiometers is
. Display code
potentiometer, thermistor, or wiring. A
also indicate a particular option is not being used, i.e., de-
mand limit not installed.
Tables 8 and 10 show set point potentiometer functions,
locations, and quick test display codes.
FAN ARRANGEMENT
30GT080,090,230B,245B
30GT100,110,255B-315B
30GT130-210 230A-315, 330A/B-420A/B†
* *
*During quick test only.
†Fan numbers 11 and 12 apply only to 190 and 210 and associated modular units (see Table 1).
**Control box.
C. QUICK TEST STEPS 31 - 42: OUTPUT RELAYS —
These quick test steps allow microprocessor to check output
signals from relay boards in unit control system. In addition,
operation of all condenser fans and compressors is checked
at each step.
compressor is started and allowed to run for approxi-
mately 10 seconds. At start-up
by
test, code
step has been successfully completed. Code
that compressor protection circuit (CPCS) or control relay
(CR) was tested.
steps
exists in one or more of the following: relay being tested,
electronic control, and/or unit wiring. Refer to Controls and
indicates a faulty
Troubleshooting literature for additional information.
display can
FAN
NO.
DISPLAY NUMBER*
1
2
3,4
5,6
1
2
3,4
5,6,7,8
5,7
6,8
3,4,9,10
1,2,11,12
Fig. 20 — Condenser Fan Sequence
46
Normal display code for steps
. In steps
through
in a few seconds. At end of 10-second test, code
returns to display indicating that test
Fan and compressor operating sequence for quick test
through
are shown in Table 8 and Fig. 20.
If quick test steps do not operate as described, a defect
QUICK TEST
3.5.
Compressor No. A1
3.9.
Compressor No. B1
3.1.
First Stage of Condenser Fans
3.2.
Second Stage of Condenser Fans
3.5.
Compressor No. A1
3.9.
Compressor No. B1
3.1.
First Stage of Condenser Fans
3.2.
Second Stage of Condenser Fans
3.5.
Compressor No. A1
3.9.
Compressor No. B1
3.1.
First Stage of Condenser Fans
3.2.
Second Stage of Condenser Fans
through
is
, when appropriate, each
appears, followed
indicated
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