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62
Table 52 — Static Pressure Control Configuration
Static Pressure Configuration (
SP.CF
) — This variable is
used to configure the use of
Comfort
Link™ controls for static
pressure control. It has the following options:
0 (None) — No static pressure control by
Comfort
Link
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
Comfort
Link
controls for static pressure control via a supply fan VFD.
2 (IGV Control) — This will enable the use of
Comfort
Link
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
Comfort
Link 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
Comfort
Link 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
Comfort
Link 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
Comfort
Link 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
Comfort
Link
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
Summary of Contents for WEATHERMASTER 48Z030
Page 103: ...103 Fig 15 Typical Power Schematic Sizes 030 050 Shown a48 8408 ...
Page 104: ...104 Fig 16 Main Base Board Input Output Connections a48 8409 ...
Page 105: ...105 Fig 17 RCB ECB CEM SCB Input Output Connections a48 8410 ...
Page 106: ...106 Fig 18 Typical Gas Heat Unit Control Wiring 48Z055 105 Units Shown a48 8411 ...
Page 107: ...107 Fig 19 Typical Electric Heat Unit Control Wiring 50Z055 105 Units Shown a50 8248 ...
Page 108: ...108 Fig 20 Typical Power Wiring 115 V 48Z Units a48 8412 ...
Page 109: ...109 Fig 21 Typical Power Wiring 115 V 50Z Units a50 8249 ...
Page 110: ...110 Fig 22 Typical Gas Heat Section Size 055 105 Units Shown a48 8413 ...
Page 111: ...111 Fig 23 Component Arrangement Size 030 050 Units ...
Page 112: ...112 Fig 24 Component Arrangement Size 055 070 Units ...
Page 113: ...113 Fig 25 Component Arrangement Size 075 105 Units ...