55
Table 69 — Static Pressure Control Configuration
*Some defaults are model number dependent.
Static Pressure Reset Economizer Position (SP.EC) — This
option effectively resets ECONOMIN to fully occupied venti-
lation position, to account for the drop in static pressure during
static pressure reset control. The static pressure reset for the
calculation cannot be larger than the supply air static set point
(SPSP).
The calculation is as follows:
(Static Pressure Reset/SPSP) x (ECONOSPR – ECONOMIN)
As an example, the static pressure set point (SPSP) =
1.5 in. wg. The current static pressure reset is set to 0.5 in. wg.
The settings for ECONOSPR = 50% and ECONOMIN = 20%.
Therefore, the amount to add to the economizer’s
ECONOMIN configuration is: (0.5/1.5) x (50-20) = 10%. In
effect, for the positioning of the economizer, ECONOMIN
would now be replaced by ECONOMIN + 10%.
Static Pressure PID Config (
S.PID) — Static pressure PID
configuration can be accessed under this heading in the Con-
figuration
→
SP submenu. Under most operating conditions the
control PID factors will not require any adjustment and the
factory defaults should be used. If persistent static pressure
fluctuations are detected, small changes to these factors may
improve performance. Decreasing the factors generally reduce
the responsiveness of the control loop, while increasing the
factors increase its responsiveness. Note the existing settings
before making changes, and seek technical assistance from
Carrier before making significant changes to these factors.
Static Pressure PID Run Rate (S.PID
→
SP.TM) — This is the
number of seconds between duct static pressure readings taken
by the ComfortLink PID routine.
Static Pressure Proportional Gain (S.PID
→
SP.P) — This is
the proportional gain for the static pressure control PID control
loop.
Static Pressure Integral Gain (S.PID
→
SP.I) — This is the
integral gain for the static pressure control PID control loop.
Static Pressure Derivative Gain (S.PID
→
SP.D) — This is the
derivative gain for the static pressure control PID control loop.
Static Pressure System Gain (S.PID
→
SP.SG) — This is the
system gain for the static pressure control PID control loop.
STATIC PRESSURE RESET — The configuration for Static
Pressure Reset is found under Configuration
→
Unit.
Static Pressure Reset Sensor (
SP.RS) — If the outdoor air
quality sensor is not configured (Configuration
→
IAQ
→
AQ.CF
→
OQ.A.C=0), then it is possible to use the outdoor
air quality sensor location on the CEM board to perform static
pressure reset via an external 4 to 20 mA input. Enabling this
sensor will give the user the ability to reset from 0 to 3-in. wg
of static pressure. The reset will apply to the supply static
pressure set point (Configuration
→
SP
→
SP.SP), where 4 mA
= 0-in. wg and 20 mA = 3-in. wg.
As an example, the static pressure reset input is measuring
6 mA, and the input is resetting 2 mA of its 16 mA control
range. The 4 to 20 mA range corresponds directly to the 0 to
3 in. wg of reset. Therefore 2 mA reset is 2/16 * 3-in. wg =
0.375-in. wg of reset. If the static pressure set point (SP.SP) =
1.5-in. wg, then the static pressure control point for the system
will be reset 1.5 – 0.375 = 1.125-in. wg.
For third party 4 to 20 mA SP reset, wire the input to the
CEM using TB6-11 and 12.
ITEM TEXT DESCRIPTION RANGE UNITS CCN POINT DEFAULT
SP SUPPLY STATIC PRESS.CFG.
SP.CF Static Pres. VFD Control? 0, 1 STATICFG 0*
SP.FN Static Pres. Fan Control? Yes/No STATPFAN Yes*
SP.S Static Pressure Sensor Enable/Disable SPSENS Disable*
SP.LO Static Press. Low Range –10 - 0 in. W.C. SP_LOW 0
SP.HI Static Press. High Range 0 - 10 in. W.C. SP_HIGH 5
SP.SP Static Pressure Setpoint 0 - 5 in. W.C. SPSP 1.5
SP.MN VFD Minimum Speed 0 - 100 % STATPMIN 20
SP.MX VFD Maximum Speed 0 - 100 % STATPMAX 100
SP.FS VFD Fire Speed Override 0 - 100 % STATPFSO 100
SP.RS Stat. Pres. Reset Config 0 - 4 SPRSTCFG 0
SP.RT SP Reset Ratio (″/dF) 0 - 2.00 SPRRATIO 0.2
SP.LM SP Reset Limit in iwc (″) 0 - 2.00 SPRLIMIT 0.75
SP.EC SP Reset Econo.Position 0 - 100 % ECONOSPR 5
S.PID STAT.PRESS.PID CONFIGS
SP.TM Static Press. PID Run Rate 1 - 200 sec SPIDRATE 2
SP.P Static Press. Prop. Gain 0 - 100 STATP_PG 20
SP.I Static Press. Intg. Gain 0 - 50 STATP_IG 2
SP.D Static Press. Derv. Gain 0 - 50 STATP_DG 0
SP.SG Static Press. System Gain 0 - 50 STATP_SG 1.0
ITEM EXPANSION RANGE
CCN
POINT
DEFAULT
→SENS→SP.RS
Static Press.
Reset Sensor.
Enable/
Disable
SPRSTSEN Disable
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