replace the sensors and/or investigate the problem. Dis-
abling this feature should only be temporary. Failure to
properly install the LAT/HPT sensors can cause permanent
damage to the HVAC equipment, as well as lose other
features that the zoning system can provide, e.g., OUT
zone, etc.
3. E3—OUTDOOR AIR TEMPERATURE SENSOR FAIL-
URE. An E3 will be displayed if the outdoor air temperature
sensor is open, or if it is reading below -40°F or above
180°F. This error will also occur if the following features
are active and the Equipment Controller cannot detect the
outdoor air temperature sensor:
Auxiliary Heat Lockout (System is configured as a heat
pump and Option No. 9 is active).
Dual Fuel Setup (DIP switch No. 8 off. System is config-
ured as a heat pump with dual fuel).
Cooling Lockout Below 55°F (DIP switch No. 7 off.
System is configured to disable cooling when outdoor
temperature is below 55°F).
Automatic Humidify Feature (User Interface is setup for
auto-humidify in heating mode).
4. E4—NONVOLATILE MEMORY FAILURE. An E4 will
be displayed if the configuration and program schedules
cannot be read. This is usually the result of a microproces-
sor failure. If cycling power does not reset this error, the
User Interface must be replaced.
5. E5—DEFROST LOCKED. An E5 will be displayed if the
defrost cycle is in process longer than 10 minutes. The
mode will automatically change to the EHEAT mode.
Cycling power will reset error, however, outdoor unit
should be checked to determine if defrost is operating
properly.
6. FF—DAMPER FUSE BLOWN. An FF will be displayed if
the fuse is open or missing. Remove plastic cover on
Equipment Controller to locate and replace fuse.
7. "--" (2 dashes)—TEMPERATURE SENSOR FAILURE.
Two dashes "--" will be displayed if a zone temperature
sensor has failed or is out of range. The User Interface and
Remote Room Sensors are considered failed if the tempera-
ture reading is outside the -40°F to 140°F range. A Smart
Sensor is considered failed if the temperature is outside the
32°F to 140°F range. See Table 4 to determine the
temperature/ohm relationship for a Remote Sensor. Do not
confuse dashes in the display ("--") for a zone that is set to
OUT or ALL ZONE.
OTHER HELPFUL HINTS
Read and understand "System Startup and Checkout" to review
Installer Test Setup Mode and check the equipment operation. This
is a good place to start in evaluating any problems associated with
the zoning system or the system equipment.
TEMPERATURE/OHM RELATIONSHIP
Table 3 shows a temperature/ohm relationship to help aid in
troubleshooting the Zone Perfect Plus System. This table will
evaluate the Remote Sensor, LAT, and HPT sensor operation. Use
a digital multimeter to perform the following:
To verify if a sensor is good, disconnect both leads from I/O board
and measure resistance through the sensor. Match ohm reading to
the table and compare temperature reading on table to ambient
temperature surrounding sensor (accuracy should be +/- 5 to 10
percent).
e.g. If 10.72k ohms are measured, this equals approximately 74°F.
To verify if I/O board is functioning normal, reattach sensor to I/O
board and set meter to 5vdc. Measure voltage across terminal
connections with sensor attached. A typical voltage of approxi-
mately 2.5vdc will indicate I/O board is functioning correctly.
→ TABLE 4—WIRING DIAGRAM REFERENCE CHART
EQUIPMENT
SELECTION
1-SPEED
AC
2-SPEED
AC
1-SPEED
HP
2-SPEED
HP
1-Stage
Furnace
Fig. 15 Fig. 16 Fig. 17 Fig. 18
2-Stage
Furnace
Fig. 19 Fig. 20 Fig. 21 Fig. 22
Variable-Speed Non-
Condensing Furnace
Fig. 23 Fig. 24 Fig. 25 Fig. 26
Variable-Speed Con-
densing Furnace
Fig. 27 Fig. 28 Fig. 29 Fig. 30
Typical Fan Coil Fig. 31 Fig. 32 Fig. 33 Fig. 34
FK4C Fan Coil Fig. 35 Fig. 36 Fig. 37 Fig. 38
TABLE 3—TEMPERATURE/OHM RELATIONSHIP
TEMP F° OHMS
30 34,480
32 32,630
34 30,760
36 29,220
38 27,470
40 26,020
42 24,680
44 23,320
46 22,070
48 20,910
50 19,830
52 18,820
54 17,870
56 16,920
58 16,160
60 15,260
62 14,530
64 13,790
66 13,090
68 12,480
70 11,860
72 11,270
74 10,750
76 10,250
78 9,750
80 9,300
82 8,840
84 8,432
86 8,042
88 7,668
90 7,310
92 6,993
94 6,661
96 6,368
98 6,085
100 5,811
102 5,571
104 5,313
106 5,088
108 4,869
110 4,660
112 4,450
114 4,268
116 4,019
118 3,918
120 3,750
—18—
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