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W8635A EQUIPMENT INTERFACE MODULE
69-1339—24
Flash COM OK LED Description
LED blinks rapidly
—indicates device is currently trans-
mitting information on the communications bus.
LED blinks once
—indicates device received and
acknowledged a message.
LED on constantly
—indicates device failure. Replace
device.
LED off constantly
—indicates a wiring problem if
device is not functioning properly and there is no
LED activity at least once a minute. Check wiring to
communications bus terminals 1, 2 and 3.
NOTE: It is normal for LED to blink continuously dur-
ing startup and discovery.
LED blinks continuously
—indicates a wiring problem
if device is not functioning properly and there is a
continuous series of LED blinks. Check wiring to
communications bus terminals 1, 2 and 3.
INSTALLER SYSTEM TEST
Use the Installer System Test to check the thermostat
and W8635A EIM operation for each thermostat in the
system. Table 5 lists the available system tests.
Table 5. Installer System Tests.
CAUTION
Equipment Damage Hazard.
Minimum compressor off-time is bypassed
during Installer System Test.
Do not allow compressor rapid cycling (on and
off).
Observe compressor protection period.
To start the Installer System Test:
1.
Press and hold the T8635L Thermostat increase
▲
and decrease
▼
keys at the same time until 10
appears. All display segments display before the
10 appears. See Fig. 7 and 8.
Fig. 7. LCD segments display.
Fig. 8. Installer Test Number display.
2.
Refer to Table 6 for Installer System Test option.
Test Number System Test Description
10-12 Heating stages can be turned on and
off in sequence
30-32 Cooling stages can be turned on and
off in sequence
40-42 Fan and damper test
60 Keyboard keys test
70-74 Thermostat information including date
code and software versions are
displayed.
Aux Ht
Heat
Auto
System Fan
Off Auto
Wake
Mon
Wait
In
Room
Outdoor
%Humid
Auto
Sav
AM
PM
Hold for
Cool
Repl Batt
On
Recovery
DST
Cool
TueWedThuFriSatSun
LeaveReturnSleep
M10345A
Set Program
Set Day/Time
Start Time
Temporary Setting Enrg
Em
Heat
Em Ht
Filter
M10257A
TEST NUMBER
Table 6. Installer System Test Options.
Key to Press Test Number Description
Heating Equipment System Test
10 Enter Heating Equipment system test.
▲
11 First Stage Heat turns on.
▲
12 Second Stage Heat turns on.
▼
11 Second Stage Heat turns off.
▼
10 First Stage Heat turns off.
Cooling Equipment System Test
30 Enter Cooling Equipment system test.
▲
31 First Stage Cool turns on.
▲
32 Second Stage Cool turns on.
▼
31 Second Stage Cool turns off.
▼
30 First Stage Cool turns off.