Specifications
59
Diff. Air Quality Hi Limit (
Configuration
→
IAQ
→
AQ.SP
→
DAQ.H) — This is the differential CO
2
levelatwhichIAQ
control of the dampers will be at maximum and the dampers
will be at the Configuration
→
IAQ
→
DCV.C
→
EC.MN.
DAQ ppm Fan On Set Point (
Configuration
→
IAQ
→
AQ.SP
→
D.F.ON) — This is the CO
2
level at which
the indoor fan will be turned on.
DAQ ppm Fan Off Set Point (
Configuration
→
IAQ
→
AQ.SP
→
D.F.OF) —ThisistheCO
2
level at which the
indoor fan will be turned off.
IAQ Low Reference (
Configuration
→
IAQ
→
AQ.S.R
→
IQ.R.L) — This is the reference that will be used with a to
non-Carrier IAQ sensor that may have a different characteristic
curve. It represents the CO
2
levelat4mA.
IAQ High Reference (
Configuration
→
IAQ
→
AQ.SR
→
IQ.R.H) — This is the reference that will be used with a
non-Carrier IAQ sensor that may have a different characteristic
curve. It represents the CO
2
levelat4mA.
OAQ Low Reference (
Configuration
→
IAQ
→
AQ.S.R
→
OQ.R.L) — This is the reference that will be used with a
non-Carrier OAQ sensor that may have a different characteris-
tic curve. It represents the CO
2
levelat4mA.
OAQ High Reference (
Configuration
→
IAQ
→
AQ.S.R
→
OQ.R.H) — This is the reference that will be used with a non-
Carrier OAQ sensor that may have a different characteristic
curve. It represents the CO
2
levelat4mA.
Diff. IAQ Responsiveness (
Configuration
→
IAQ
→
AQ.SP
→
IAQ.R) — This is the configuration that is used to select the
IAQ response curves as shown in Fig. 11.
PRE-OCCUPANCY PURGE — The control has the option
for a pre-occupancy purge to refresh the air in the space prior to
occupancy.
This feature is enabled by setting Configuration
→
IAQ
→
IAQ.P
→
IQ.PG to Yes.
The IAQ Purge will operate under the following conditions:
• IQ.PG is enabled
• the unit is in the unoccupied state
• Current Time is valid
• Next Occupied Time is valid
• time is within two hours of the next occupied period
• time is within the purge duration (Configuration
→
IAQ
→
IAQ.P
→
IQ.P.T)
If all of the above conditions are met, the following logic is
used:
If OAT ≥ IQ.L.O and OAT ≤ OCSP and economizer is
available then purge will be enabled and the economizer will
be commanded to 100%.
Else, if OAT < IQ.L.O then the economizer will be posi-
tioned to the IAQ Purge LO Temp Min Pos (Configuration
→
IAQ
→
IAQ.P
→
IQ.P.L)
If neither of the above are true then the dampers will be
positioned to the IAQ Purge HI Temp Min Pos (Configuration
→
IAQ
→
IAQ.P
→
IQ.P.H)
If this mode is enabled the indoor fan and heat interlock
r e l a y ( VAV ) w i l l b e e n e r g i z e d .
IAQ Purge (
Configuration
→
IAQ
→
IAQ.P
→
IQ.PG) —This
is used to enable IAQ pre-occupancy purge.
IAQ Purge Duration (
Configuration
→
IAQ
→
IAQ.P
→
IQ.P.T) — This is the maximum amount of time that a purge
can occur.
IAQ Purge Lo Temp Min Pos (
Configuration
→
IAQ
→
IAQ.P
→
IQ.P.L) — This is used to configure a low limit for
damper position to be used during the purge mode.
IAQ Purge Hi Temp Min Pos (
Configuration
→
IAQ
→
IAQ.P
→
IQ.P.H) — This is used to configure a maximum po-
sition for the dampers to be used during the purge cycle.
IAQ Purge OAT Lockout Temp (
Configuration
→
IAQ
→
IAQ.P
→
IQ.L.O) — Nighttime lockout temperature below
which the purge cycle will be disabled.
Temperature Compensated Start — This logic is
used when the unit is in the unoccupied state. The control will
calculate early Start Bias time based on Space Temperature
deviation from the occupied cooling and heating set points.
This will allow the control to start the unit so that the space is at
conditioned levels when the occupied period starts. This is
required for ASHRAE 90.1 compliance. A space sensor is re-
quired for non-linkage applications.
SETTING UP THE SYSTEM — The settings for tempera-
ture compensated start can be found in the local display under
Configuration
→
UNIT.
TCST-Cool Factor (
TCS.C) — This is the factor for the start
time bias equation for cooling.
TCST-Heat Factor (
TCS.H) — This is the factor for the start
time bias equation for heating.
NOTE: Temperature compensated start is disabled when these
factors are set to 0.
TEMPERATURE COMPENSATED START LOGIC — The
following conditions must be met for the algorithm to run:
• Unit is in unoccupied state.
• Next occupied time is valid.
• Current time of day is valid.
• Valid space temperature reading is available (sensor or
DAV-Linkage).
The algorithm will calculate a Start Bias time in minutes us-
ing the following equations:
If (space temperature > occupied cooling set point)
Start Bias Time = (space temperature – occupied cooling set
point)* TCS.C
If (space temperature < occupied heating set point)
Start Bias Time = (occupied heating set point – space
temperature)*TCS.H
When the Start Bias Time is greater than zero the algorithm
will subtract it from the next occupied time to calculate the new
start time. When the new start time is reached, the Temperature
Compensated Start mode is set (Operating Modes
→
MODE
→
T. C.S T), the fan is started and the unit controlled as in an occu-
pied state. Once set, Temperature Compensated mode will stay
on until the unit goes into the Occupied mode. The Start Bias
Time will be written into the CCN Linkage Equipment Table if
the unit is controlled in DAV mode. If the Unoccupied Econo-
mizer Free Cool mode is active (Operating Modes
→
HVAC =
“UNOCC FREE COOL”) when temperature compensated
start begins, the Unoccupied Free Cool mode will be stopped.
Carrier Comfort Network (CCN) — It is possible to
configure the ComfortLink™ control to participate as an ele-
ment of the Carrier Comfort Network (CCN) directly from the
local display. This section will deal with explaining the various
programmable options which are found under the CCN sub-
menu in the Configuration mode.
The major configurations for CCN programming are locat-
ed in the local displays at Configuration
→
CCN. See Table 67.
CCN Address (
CCNA) — This configuration is the CCN ad-
dress the rooftop is assigned.
ITEM EXPANSION RANGE UNITS CCN POINT
TCS.C
Temp.Cmp.Strt.Cool Factr 0 - 60 min TCSTCOOL
TCS.H
Temp.Cmp.Strt.Heat Factr 0 - 60 min TCSTHEAT