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25 68-0173—3
TO ENTER THE INSTALLER SETUP MODE:
1. Hold the PC8900A CHECK key until all display seg-
ments are displayed (approximately three seconds).
See Fig. 29.
2. Press the up and down arrowhead keys at the same
time. The display goes blank, except for up to four seg-
ments (SYSTEM, HEAT, COOL, FAN) as shown in
Fig. 30. One of these segments flashes. The flashing
segment indicates the current menu selection.
TO CHANGE TO ANOTHER SELECTION:
1. Press the up or down arrowhead key until the desired
segment is flashing.
2. Once the desired segment is flashing, press the
CHECK key for options within that segment. The
options are SYSTEM, HEAT, COOL and FAN.
3. Press RUN to exit the installer setup.
System Options
When SYSTEM is flashing, the following list of options
pertaining to the equipment and sensors connected to the
system appears on the PC8900A display. To make each
selection, press the CHECK key. See Table 4 for setting
options.
Fig. 29. All segments on display.
SYSTEM OFF AUTO
SUN MON TUE WED THU FRI SAT WAKELEAVERETURNSLEEP TEMPORARY VENT
AM
PM
AUTO
ON
CIRC
FAN
M6360
AUX HEAT SET PT COOL SET PT
Table 4. System Setting Options
Factory-Setting Description
Other Choices (Press
Up or Down Arrowhead
Keys to Change) Description
System switch is configured for
manual changeover HEAT-OFF-
COOL or EM HT-HEAT-OFF-COOL.
System switch is configured for automatic
changeover HEAT-OFF-COOL-AUTO or
EM HT-HEAT-OFF-COOL-AUTO.
Five-minute compressor protection is
on; calls for cooling (heat pump) are
followed by a five-minute enforced
shutdown.
No compressor protection exists. Calls for
cooling (heat pump) can occur
immediately.
System does not have a C7189A
Remote Indoor Sensor.
System does have a C7189A Remote
Indoor Sensor.
System does not have a C7100A
Discharge Air Sensor.
System does have a C7100A Discharge
Air Sensor.
System uses PC8900A temperature
only. If the system is configured for a
remote sensor (SENS REM Y),
temperature control is averaged
between C7189A Remote Indoor
Sensor and PC8900A Control Panel.
System uses C7189A Remote Indoor
Sensor only. Be sure the system is
configured for remote sensor
(SENS REM Y).
System does not have a C7089A
Outdoor Sensor.
System does have a C7089A Outdoor
Sensor.
System has an Energy Recovery
Ventilator (for example, Honeywell
ER90). Calls for ventilation, close
System has an outside air damper. Calls
for ventilation close VNT contacts and
activate system fan.
System has no ventilation equipment. A
call for ventilation activates the system fan.
Communications should always be
configured to N. If CM8900A
Communication Module is present, it
changes to Yes automatically.
Communication module is activated.
W8900A-C automatically changes to this
setting when communication is received.
W8900B model only. O/B terminal
energized in heating only. Use this
setting for heat pumps with heating
changeover.
W8900B model only. O/B terminal
energized in cooling only. Use this setting
for heat pumps with cooling changeover.
System has a humidifier that is used
in the heating mode.
a
System has no humidifier.
M6361
M6375
M6362
M6376
M6363
M6377
M6364
M6378
M6365
M6379
M6366
M6380
M6367
M6381
M6382
M6368
M6383
M6369
M
638
4
M6370
M6385