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W8635A EQUIPMENT INTERFACE MODULE
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.
Test Number
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.
Key to Press
Heating Equipment System Test
Cooling Equipment System Test
69-1339—2
System Test Description
Table 6. Installer System Test Options.
Test Number
10
11
12
11
10
30
31
32
31
30
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
appears. All display segments display before the
10 appears. See Fig. 7 and 8.
Set Program
Hold for
Em Ht
Aux Ht
Mon
TueWedThuFriSatSun
Wake
LeaveReturnSleep
System
Em Heat
Fig. 7. LCD segments display.
Fig. 8. Installer Test Number display.
2. Refer to Table 6 for Installer System Test option.
Enter Heating Equipment system test.
First Stage Heat turns on.
Second Stage Heat turns on.
Second Stage Heat turns off.
First Stage Heat turns off.
Enter Cooling Equipment system test.
First Stage Cool turns on.
Second Stage Cool turns on.
Second Stage Cool turns off.
First Stage Cool turns off.
4
keys at the same time until 10
Temporary Setting Enrg
Start Time
Set Day/Time
AM
PM
Heat
Cool
Recovery
Filter
In
Auto
Fan
DST
Off
Cool
Auto
Wait
TEST NUMBER
Description
Sav
Room
%Humid
Outdoor
Repl Batt
On
Auto
M10345A
M10257A
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