Specifications
CLEARING THE ALARM FROM THE THERMOSTAT —
Heat/Cool Mode Alarms are cleared or "erased" from the
system in two ways:
• Cycle power to the thermostat OFF, then ON.
• Reset the Unit Thermostat. Initiate a reset by switching
the Unit Reset to the ON configuration (category 7,
option 11).
Fan Status Alarm — Refer to Table 8 for Fan Status
Alarm specifications.
Table 8 — Fan Status Alarm
FUNCTION DESCRIPTION
Controllers Monitor Thermostat
Sensor Required Air Flow, Digital Input
Sensor Wiring
Terminals 8 and 9 of 33CSUCE-06
Relay Pack or Wire to Damper
Board
Input
Open contacts at sensor from lack
of airflow
Output
Alarm SE06, Cannot Detect Fan ON
Alarm SE12, Cannot Detect Fan OFF
Category/Option 5.10 (Fan Status)
Configuration Values Default OFF, Min OFF, Max ON
Configuration Increments None
Associated Functions
Fan Operation for Heat
(Category 4/Option 1)
OPERATION
The Detecting or Verifying Fan is Running. The Fan Relay
is On or Heat 1 Relay is On.
When the monitor thermostat indicates commanded state
of FAN (relay) is on, but flow switch indicates no airflow
after 30-second time delay (sensor contacts still open), an
alarm condition is initiated (heat or cool or ventilation mode).
When the monitor thermostat indicates commanded state
of HEAT 1 (relay) is on, but flow switch indicates no airflow
after 120-second delay time (sensor contacts still open), an
alarm condition is initiated. This delay time allows for units
having internal control of heat, versus thermostat control of
heat.
When an alarm condition is initiated:
• system mode (either heat or cool) is dropped
• alarm SE06, Cannot Detect Fan On, is issued
• A manual reset is required to reset the alarm
Detecting or Verifying Fan is OFF. Fan Relay is OFF and
Heat 1 Relay OFF.
When the monitor thermostat indicates commanded state
of FAN (relay) is OFF, but flow switch indicates that airflow
still exists after 120-second delay time from fan off com-
mand (sensor contacts still closed), an alarm condition is
initiated.
When alarm condition is initiated:
• the monitor thermostat will not continue to operate the
system.
• 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
procedure 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 monitor 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 con-
tacts are closed within 30 seconds, the system operates nor-
mally and no Fan Status alarm is generated. If, however, the
sensor contacts are not closed within 30 seconds, an alarm
is generated. The thermostat display will not indicate "fan"
until fan operation is verified by the fan-status flow switch.
The alarm will cause the system to shut down. No cool-
ing, 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 config-
ured 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
three ways using a manual reset:
1. Cycle power to the thermostat off, then on.
2. Initiate a reset by switching the Unit Reset option to the
ON, configuration (category 7, option 11).
3. 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
FUNCTION DESCRIPTION
Controllers Monitor Thermostat
Sensor Required Filter, 33CSFS - - 01, Digital Input
Sensor Wiring
Terminals 10 and 11 of 33CSUCE-06
Relay Pack or Wire to Damper Board
Input Closed contacts from high pressure drop
Output Alarm SE09, Dirty Filter
Category/Option 5.11 (Humidity Sensor/Filter Status Switch)
Configuration
Values
Default 0, Min 0, Max 2 to activate
Configuration
Increments
None
Associated
Functions
None
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 excessive 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
contacts 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 monitor ther-
mostat 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.
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