Carrier 48/50Z030-105 - page 62

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Table 52 — Static Pressure Control Configuration
Static Pressure Configuration (SP.CF) — This variable is
used to configure the use of ComfortLink™ controls for static
pressure control. It has the following options:
0 (None) — No static pressure control by ComfortLink
controls. This would be used for a constant volume (CV)
application when static pressure control is not required or for a
VAV application if there will be third-party control of the VFD
or IGV. In this latter case, a suitable means of control must be
field installed.
1 (VFD Control) — This will enable the use of ComfortLink
controls for static pressure control via a supply fan VFD.
2 (IGV Control) — This will enable the use of ComfortLink
controls for static pressure control via supply fan inlet guide
vanes (IGV).
Static Pressure Sensor (SP.S) — This variable enables the use
of a supply duct static pressure sensor. This must be enabled to
use ComfortLink controls for static pressure control. If using a
third-party control for the VFD or IGV, this should be disabled.
Static Pressure Low Range (SP.LO) — This is the minimum
static pressure that the sensor will measure. For most sensors
this will be 0 in. wg. The ComfortLink controls will map this
value to a 4 mA sensor input.
Static Pressure High Range (SP.HI) — This is the maximum
static pressure that the sensor will measure. Commonly this
will be 5 in. wg. The ComfortLink controls will map this value
to a 20 mA sensor input.
Static Pressure Set Point (SP.SP) — This is the static pres-
sure control point. It is the point against which the
ComfortLink controls compares the actual measured supply
duct pressure for determination of the error that is used for PID
control. Generally one would set SP.SP to the minimum value
necessary for proper operation of air terminals in the condi-
tioned space at all load conditions. Too high of a value will
cause unnecessary fan motor power consumption at part-load
conditions and/or noise problems. Too low a value will result in
insufficient airflow. Additional information will be found on
page 63, under Static Pressure Reset.
VFD-IGV Minimum Speed (SP.MN) — This is the mini-
mum speed for the supply fan VFD or the minimum opening
for the supply fan IGV. Typically the value is chosen to main-
tain a minimum level of ventilation.
NOTE: Most VFDs have a built-in minimum speed adjustment
which must be configured for 0% when using ComfortLink
controls for static pressure control.
VFD-IGV Maximum Speed (SP.MX) — This is the maxi-
mum speed for the supply fan VFD or the maximum opening
for the supply fan IGV. This is usually set to 100%.
VFD-IGV Fire Speed Override (SP.FS) — This is the speed
that the supply fan VFD or the supply fan IGV will use during
the fire modes; pressurization, evacuation and purge. This is
usually set to 100%.
Static Pressure Reset Configuration (SP.RS) — This option
is used to configure the static pressure reset function. When
SP.RS = 0, there is no static pressure reset via an analog input.
When SP.RS = 1, there is static pressure reset based on the
CEM 4-20MA input and ranged from 0 to 3 in. wg. When
SP.RS = 2, there is static pressure reset based on RAT and
defined by SP.RT and SP.LM. When SP.RS = 3, there is
static pressure reset based on SPT and defined by SP.RT and
SP.LM. When SP.RS = 4, there is VFD speed control where
0 mA = 0% speed and 20 mA = 100% (SP.MN and SP.MX will
override).
Static Pressure Reset Ratio (SP.RT) — This option defines
the reset ratio in terms of static pressure versus temperature.
The reset ratio determines how much is the static pressure
reduced for every degree below set point for RAT or SPT.
Static Pressure Reset Limit (SP.LM) — This option defines
the maximum amount of static pressure reset that is allowed.
This is sometimes called a “clamp.”
NOTE: Resetting static pressure via RAT and SPT is primarily
a constant volume application which utilizes a VFD. The rea-
soning is that there is significant energy savings in slowing
down a supply fan as opposed to running full speed with
supply air reset. Maintaining the supply air set point and
ITEM EXPANSION RANGE UNITS CCN POINT DEFAULT
SP SUPPLY STATIC PRESS.CFG.
→SP.CF Static Pressure Config 0, 1, 2 STATICFG 0
→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-IGV Minimum Speed 0 - 100 % STATPMIN 20
→SP.MX VFD-IGV Maximum Speed 0 - 100 % STATPMAX 100
→SP.FS VFD-IGV Fire Speed Over. 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
→S.PID→SP.TM Static Press. PID Run Rate 5 - 120 sec SPIDRATE 15
→S.PID→SP.P Static Press. Prop. Gain 0 - 5 STATP_PG 0.5
→S.PID→SP.I Static Pressure Intg. Gain 0 - 2 STATP_IG 0.5
→S.PID→SP.D Static Pressure Derv. Gain 0 - 5 STATP_DG 0.3
→ACT.C IGV ACTUATOR CONFIGS
→ACTC→SN.1 IGV Serial Number 1 0 - 255 IGV_SN1 0
→ACTC→SN.2 IGV Serial Number 2 0 - 255 IGV_SN2 0
→ACTC→SN.3 IGV Serial Number 3 0 - 255 IGV_SN3 0
→ACTC→SN.4 IGV Serial Number 4 0 - 255 IGV_SN4 0
→ACTC→SN.5 IGV Serial Number 5 0 - 255 IGV_SN5 0
→ACTC→C.A.LM IGV Cntrl Angle Lo Limit 0-90 deg IGV_CALM 25