Carrier 33CS Installation, Service, And Troubleshooting Instructions Download

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When alarm condition is initiated:

• the TEMP system thermostat will continue to operate

the system. This allows future calls for heat or cool to be
initiated.

• alarm SE12, Cannot Detect Fan OFF, is issued
• a manual reset is required to reset the alarm
CONFIGURATION TO ACTIVATE ALARM — To activate
the alarm, configure the Fan Status Switch option (category 5,
option 10) to ON. Leave the Fan Operation For Heat option
(category 4, option 1) ON.
CONFIGURATION TO NORMALIZE ALARM — To nor-
malize the alarm, no is configuration required. Follow the pro-
cedure to clear the alarm below.
CONFIGURATION EXAMPLE — The Fan Status Switch
option (category 5, option 10) is set to ON.

At the start of a cooling mode, the fan relay is switched on

by the TEMP system thermostat. Fan operation is initiated and
the fan has 30 seconds to generate sufficient airflow to close
the normally-open fan-status flow switch. If the sensor contacts
are closed within 30 seconds, the system operates normally and
no Fan Status alarm is generated. If, however, the sensor con-
tacts are not closed within 30 seconds, an alarm is generated.
The thermostat display will not indicate ‘‘fan’’ until fan opera-
tion is verified by the fan-status flow switch.

The alarm will cause the system to shut down. No cooling,

heating, or ventilation is available until a reset of the system is
initiated.

In a heat mode, the same sequence is followed, except that

the delay time is increased to 120 seconds. If the Fan Operation
for Heat option (category 4, option 1) is configured OFF, no
alarm is generated in the heat mode.
CLEARING THE ALARM FROM THE THERMOSTAT —
Fan status alarms are cleared or erased from the system in 3
ways using a manual reset:
• Cycle power to the thermostat off, then on.
• Initiate a reset by switching the Unit Reset option to the ON

configuration (category 7, option 11).

• Switch the configuration value for the Fan Status Switch

option to OFF then ON (category 5, option 10).

Filter Status Alert —

Refer to Table 9 for Filter Status

alert specifications.

Table 9 — Filter Status Alert

OPERATION — This alert is used to indicate the status of the
filters in the HVAC unit. The Dirty Filter alert indicates a high
pressure drop across the filters, caused by collection of exces-
sive particles and debris on the filter media.

Pressure drop across the filters in the unit increases until it

reaches the Filter Status sensor’s set point. This causes the con-
tacts of the sensor to close. The contact closure of the sensor is
detected by a discrete input. If the contacts remain closed for
10 minutes, a Dirty Filter alert is initiated.

A manual reset is required to clear this alert.

CONFIGURATION TO ACTIVATE ALERT — To activate
the alert, configure the Humidity Sensor/Fan Filter Switch
option (category 5, option 11) to position 2. The TEMP system
thermostat will use the sensor as a Filter Status Switch.
CONFIGURATION TO NORMALIZE ALERT — An SE09
alarm (alert) will not stop operation of the system. A manual
reset is required to clear this alert.
CONFIGURATION EXAMPLE — The Filter Status sensor
will close contacts (alert) when differential pressure increases
from zero (clean filter, no restriction, or pressure drop across
filter) to the sensor set point (dirty filter with restriction across
filter). The Humidity Sensor/Fan Filter Switch option (cate-
gory 5, option 11) is set to the value of 2 to specify the filter
status switch.

During operation of the unit over a period of time, an SE09

error is declared. This indicates that the differential pressure
across the filters has increased beyond the set point value of the
sensor. The Alternate Information ‘‘Dirty Filter Status’’ (cate-
gory 7, option 3, information item 9) will read ON, also indi-
cating a dirty filter.

After the dirty filters are changed, the Dirty Filter Status

must be manually reset. The system then returns to normal op-
eration and will not alert until the differential pressure set point
of the Filter Status sensor is again reached.
CLEARING THE ALERT FROM THE THERMOSTAT —
Dirty Filter Alerts are cleared or erased from the system in 3
ways using a manual reset:
• Cycle power to the thermostat off, then on.
• Initiate a reset by switching the Unit Reset option to the ON

configuration (category 7, option 11).

• Switch the configuration value for Fan Status Switch option

to OFF then ON (category 5, option 10)

Indoor-Air Quality Status Alarm —

Refer to

Table 10 for IAQ alarm specifications.

Table 10 — IAQ (Indoor-Air Quality) Status Alarm

LEGEND

OPERATION — When the CO

level exceeds the preset level,

the sensor signals the TEMP system thermostat. The TEMP
system thermostat will wait until the IAQ Alarm Delay option
(category 14, option 7) has expired, then it will issue an SE10.
The system (if configured) will bring in fresh outdoor air to
meet IAQ requirements.

FUNCTION

DESCRIPTION

Controllers

TEMP System Thermostat

Sensor Required

Filter, 33CSFS--01, Digital Input

Sensor Wiring

Terminals 10 and 11 of 33CSUCE-06
Relay Pack

Input

Closed contacts from high pressure
drop

Output

Alarm (SE09), Dirty Filter