Carrier 33CS Installation, Service, And Troubleshooting Instructions Download

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ALARM OPTIONS

The alarms options of the TEMP system thermostat are re-

sponsible for transmitting alarms on the CCN (Carrier Comfort
Network). A specified device (such as the Building Supervisor)
on the CCN records the alarm messages from all devices and
uses this data to produce alarm messages. The TEMP system
thermostat detects successful transmission of the alarm and
will retry if there is a communication failure. If the alarm per-
sists, the TEMP system thermostat will re-issue the alarm after
the expiration of the re-alarm time.

Equipment Priority —

The Equipment Priority function

tells the error recording device the priority of the device that is
sending the alarm. The priority determines which alarms are
shown first and which alarms are deleted when the alarm mem-
ory is full. To set the option, configure category 11, option 1.
The range is 0 to 7, where 7 is the highest priority. The default
value is 7 (TEMP system thermostat priority).

Communication Failure Retry Time —

The Com-

munication Failure Retry Time option configures how long the
TEMP system thermostat will wait before re-sending an alarm
that was not received by a device. The option is configured in
category 11, option 2. The range of acceptable values is 1 to
240 minutes. The default is 10 minutes.

Re-Alarm Time —

The Re-Alarm Time option config-

ures how long the TEMP system thermostat will wait before
re-sending an alarm after the alarm message has been received
by a device. When the condition returns to normal, the alarm
will no longer be sent. The option is configured in category 11,
option 3. The range of acceptable values is 1 to 255 minutes.
The default is 30 minutes. A value of 255 disables the function.

Alarm Routing Control —

The Alarm Routing Con-

trol option determines which devices on the CCN will receive
and process the alarm information. This option cannot be con-
figured from the TEMP system thermostat. The default value is
11000000. A value of 10000000 sends alarms to the Building
Supervisor. A value of 01000000 sends alarms to the auto-dial
gateway. A value of 00010000 sends alarms to the printer inter-
face. A value of 00000000 disables all alarms going out on the
CCN. The option is configured through Carrier network access
software.

Alarm System Name —

The Alarm System Name op-

tion identifies the alarm system on the CCN. This option can-
not be configured from the TEMP system thermostat. The de-
fault name is 33CSVM. The option is configured through
Carrier network access software.

LOADSHED

The Loadshed module is a device on the network that moni-

tors system electrical energy usage. A field-supplied watt-
meter is required. The Loadshed module can be programmed
to send out Redline and Loadshed commands to devices on the
network when energy usage nears user-defined set points. The
devices are specified by group number. The Redline and Load-
shed commands cause the TEMP system thermostat to turn off
some or all stages of heating or cooling. When the energy us-
age drops below a defined level the Loadshed module releases
the command. The Demand Limit Group Number option de-
fines which group the TEMP system thermostat will be in.

When the Loadshed sends a Redline command to the

TEMP system thermostat, the TEMP system thermostat will
turn off second stage heating or cooling operation if the second
stage is currently operating and not allow second stage heating
or cooling to come on.

When the Loadshed sends a Loadshed command to the

TEMP system thermostat, the TEMP system thermostat will
turn off first and second stage heating or cooling operation if
the first or second stages are currently operating and not allow
heating or cooling to come on.

To configure the Demand Limit Group Number option, set

category 13, option 1. The range of values is 0 to 16. If the op-
tion is set to 0, the TEMP system thermostat will not be part of
the Loadshed group operation. If the option is set from 1 to 16,
the TEMP system thermostat will receive Loadshed commands
for that group. The default is 0. For more information, refer to
the Loadshed configuration manual.

ALARM TROUBLESHOOTING

This section describes the major alarm types that are avail-

able within the system. The alarm types are: space temperature
alarm (comfort trend), discharge-air temperature alarm, fan sta-
tus alarm, filter status alert, IAQ status alarm, and stuck gas
valve alarm.

The section describes each alarm in detail: what controllers

it works with; the sensors required for the alarm to be activated;
and how the alarm is configured, disabled, and normalized.
The description provides information on how the alarm is ap-
plied and the necessary hardware required for proper operation.

Space Temperature Alarm (Comfort Trend) —

See

Table 6 for Space Temperature Alarm Specifications.

Table 6 — Space Temperature Alarm

OPERATION — A space temperature (Comfort Trend) alarm
indicates when the system is unable to maintain space temper-
ature comfort conditions. Space temperature alarms are an
indication that the HVAC system operation has difficulty
maintaining zone space temperature. The temperature demand
of the space or zone is the difference between the set point
(either heating or cooling) and actual space temperature of the
zone.

When the demand of the zone exceeds the Comfort Trend

Demand value (category 7, option 4), the thermostat begins to
calculate the temperature trend of the zone. The temperature
trend is simply the ‘‘real time’’ ability of the space to lower or
reduce the temperature demand of the space. The time is mea-
sured during the period when the temperature trend does not
show improvement, or indicates conditions between set point
and space temperature are getting worse. When the length of
time measured reaches the Comfort Trend Time Limit value, a
Space Temperature alarm is initiated.

It is recommended that this value not be changed. Equip-
ment damage can occur if low priority values are given to
high priority alarms.

FUNCTION

DESCRIPTION

Controllers

TEMP System Thermostat

Sensor Required

None (Space Temperature Sensor is
in Thermostat)

Sensor Wiring

None, Sensor Integral to Thermostat

Input

Comfort Trend Demand
Comfort Trend Time Limit

Output