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 EC 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
Comfort
Link 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
Summary of Contents for WEATHERMAKER 48AJ020
Page 95: ...95 Fig 13 Typical Main Control Box Wiring Schematic A48 7787 ...
Page 96: ...96 TO NEXT PAGE Fig 14 Auxiliary Control Box Wiring Schematic A48 7294 ...
Page 98: ...98 Fig 15 Typical 2 Stage Gas Heat Wiring Schematic Size 051 and 060 Units Shown A48 6866 ...
Page 102: ...102 TO NEXT PAGE Fig 18 Typical Power Schematic Size 051 and 060 Units Shown A48 7298 ...
Page 104: ...104 Fig 19 Controls Option Wiring Schematic A48 7810 ...
Page 105: ...105 Fig 20 Small Chassis Component Location Size 020 035 Units A48 7301 ...
Page 106: ...106 Fig 21 Large Chassis Component Locations Size 036 060 Units A48 7302 ...