Bryant ZONE PERFECT PLUS ZONEBB2KIT Installation Instructions Manual page 18

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 3—TEMPERATURE/OHM RELATIONSHIP
TEMP F°
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
62
64
66
68
70
72
74
76
78
80
82
84
86
88
90
92
94
96
98
100
102
104
106
108
110
112
114
116
118
120
→ TABLE 4—WIRING DIAGRAM REFERENCE CHART
EQUIPMENT
SELECTION
1-Stage
Furnace
2-Stage
Furnace
Variable-Speed Non-
Condensing Furnace
Variable-Speed Con-
densing Furnace
Typical Fan Coil
FK4C Fan Coil
—18—
OHMS
34,480
32,630
30,760
29,220
27,470
26,020
24,680
23,320
22,070
20,910
19,830
18,820
17,870
16,920
16,160
15,260
14,530
13,790
13,090
12,480
11,860
11,270
10,750
10,250
9,750
9,300
8,840
8,432
8,042
7,668
7,310
6,993
6,661
6,368
6,085
5,811
5,571
5,313
5,088
4,869
4,660
4,450
4,268
4,019
3,918
3,750
1-SPEED 2-SPEED 1-SPEED
AC AC HP
Fig. 15 Fig. 16 Fig. 17
Fig. 19 Fig. 20 Fig. 21
Fig. 23 Fig. 24 Fig. 25
Fig. 27 Fig. 28 Fig. 29
Fig. 31 Fig. 32 Fig. 33
Fig. 35 Fig. 36 Fig. 37
2-SPEED
HP
Fig. 18
Fig. 22
Fig. 26
Fig. 30
Fig. 34
Fig. 38