Optimize Staging; System Status Display; System Time Guards - Carrier 33CS Installation, Service, And Troubleshooting Instructions

EQUIPMENT OPERATION DURING A SYSTEM HEAT-
ING MODE — The TEMP system thermostat utilizes the
relay pack to energize the first stage of heating after system
heating mode is selected. When the reference zone heating
demand is 2.0° F or greater, the second stage of heating is
energized or optimized staging is followed. The second stage
of heating is released when demand drops below 1.0° F. The
first stage of heating is deenergized when the system heating
mode is released.
Optimize Staging —
establishes a pattern for the changing temperature condi-
tions of the reference zone. If the zone temperature condi-
tions are improving, the TEMP system thermostat will not
energize the second stage of heating or cooling.
When the Optimize Staging option is configured to ON,
the TEMP system thermostat energizes the second stage heat-
ing or cooling only if the zone temperature trend has not
improved for a 6-minute time limit. The 6-minute limit is
reset if conditions begin to improve.
When the Optimize Staging option is configured to OFF,
the TEMP system thermostat energizes the second stage heat-
ing or cooling normally.
To configure the Optimize Staging option, set category 4,
option 10. Use the left set point buttons to toggle the option
ON and OFF. The default is ON.
By preventing unnecessary use of the second stage heat-
ing or cooling, the Optimize Staging option allows the heating/
cooling equipment to operate more economically without
sacrificing individual zone comfort.
When zone temperature conditions exceed the desired oc-
cupied level, if first stage heating or cooling is able to im-
prove the occupied level, second stage heating or cooling is
not required.
The TEMP system thermostat uses Optimized Staging to
follow zone conditions and determine when use of first stage
is improving zone conditions. If zone conditions are not im-
proving, or are becoming worse, the TEMP system thermo-
stat will energize the second stage of heating or cooling.
System Status Display —
mostat indicates the system mode and equipment operation
by displaying system annunciators. FAN is displayed when
the TEMP system thermostat energizes the fan relay. COOL
is displayed when the TEMP system thermostat energizes a
cooling relay. HEAT is displayed when the TEMP system
thermostat energizes a heating relay. When a second stage of
heating or cooling is energized, a decimal point is displayed
between the set points.
System Time Guards —
stat has different system time limits (time guards) which pre-
vent an individual system heating or cooling mode from be-
ing selected after the system mode has been released or after
the TEMP system thermostat receives power.
HIGH/LOW TEMPERATURE LIMIT TIME GUARD —
This feature functions to keep the HVAC equipment oper-
ating to reduce equipment cycling. By monitoring the supply-
air temperatures, the TEMP system thermostat can adjust
operation to prevent tripping of the heating/cooling tem-
perature limits.
When the supply-air temperature exceeds the first or sec-
ond stage Heating or Cooling Temperature Limit the corre-
sponding stage of heating or cooling is disabled.
If the TEMP system thermostat is in a system mode, it
will reenergize the appropriate stages of heating or cooling
when 10 minutes have passed and the supply-air tempera-
ture is no longer exceeding the first or second stage Heating
or Cooling Temperature Limit.
The Optimize Staging function
The TEMP system ther-
The TEMP system thermo-
During equipment operation, when a limit is exceeded,
the following relays are deenergized:
• Second Stage Limit. The second stage relay (H2 or C2) is
deenergized.
• First Stage Limit. The first stage relay (H1 or C1) is
deenergized.
When the LAT (leaving-air temperature) Monitoring op-
tion is set to ON, the TEMP system thermostat maintains
system heating and cooling supply-air temperature limits and
enables the LAT algorithm.
When the LAT Monitoring option is set to OFF, the TEMP
system thermostat will not maintain heating and cooling supply-
air temperature limits and the LAT algorithm is disabled.
To configure the LAT Monitoring option, set category 4,
option 4. Use the left set point buttons to toggle the option
ON and OFF. The default is ON.
First Stage Cooling Temperature Limit —If the duct entering-
air temperature drops below the First Stage Cooling Tem-
perature Limit and the LAT Monitoring function is ON, the
TEMP system thermostat will deenergize first stage cooling.
To configure the First Stage Cooling Temperature Limit
option, set category 4, option 5. Use the left set point but-
tons to raise or lower the set point until the desired tempera-
ture is shown. The range of acceptable values is 40 to 45 F,
in one degree increments. The default is 45 F.
NOTE: The first stage limit cannot be set higher than the
second stage limit.
Second Stage Cooling Temperature Limit — If the duct
entering-air temperature drops below the Second Stage Cool-
ing Temperature Limit and the LAT Monitoring function is
ON, the TEMP system thermostat will deenergize second stage
cooling.
To configure the Second Stage Cooling Temperature Limit
option, set category 4, option 6. Use the left set point but-
tons to raise or lower the set point until the desired tempera-
ture is shown. The range of acceptable values is 45 to 50 F,
in one degree increments. The default is 50 F.
First Stage Heating Temperature Limit — If the duct entering-
air temperature rises above the First Stage Heating Tem-
perature Limit and the LAT Monitoring function is ON, the
TEMP system thermostat will deenergize first stage heating.
To configure the First Stage Heating Temperature Limit
option, set category 4, option 7. Use the left set point but-
tons to raise or lower the set point until the desired tempera-
ture is shown. The range of acceptable values is 110 to
180 F, in one degree increments. The default is 110 F.
Second Stage Heating Temperature Limit — If the duct
entering-air temperature rises above the Second Stage Heat-
ing Temperature Limit and the LAT Monitoring function is
ON, the TEMP system thermostat will deenergize second stage
heating.
To configure the Second Stage Heating Temperature Limit
option, set category 4, option 8. Use the left set point but-
tons to raise or lower the set point until the desired tempera-
ture is shown. The range of acceptable values is 105 to
160 F, in one degree increments. The default is 105 F.
→
High/Low Temperature Limit Display — When a Heating
or Cooling Temperature Limit is exceeded the TEMP sys-
tem thermostat flashes the appropriate system annunciators.
COOL flashes when a Low Temperature Limit is
exceeded. HEAT flashes when a High Temperature Limit is
exceeded. An SE11 alarm will be issued.
HEATING AND COOLING TIME GUARD — When the
Time Guard Between Modes option is ON, the TEMP sys-
tem thermostat cannot change system modes until the heating/
cooling time guard period has expired. The heating and cooling
time guard is 5 minutes.
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