83
Table 67 — Economizer Run Status Table
Building Pressure Control
This control sequence provides control of the building pressure
through the modulating flow rate functions of one of the modulat-
ing power exhaust options or through management of the return
fan option. This function also provides control of the constant vol-
ume 2-stage power exhaust option. See below for available power
exhaust options for each unit model.
BUILDING PRESSURE CONFIGURATION
The building pressure configurations are found at the local display
under Configuration
BP. See Table 68.
Building Pressure Config (BP.CF)
This configuration selects the type of building pressure control.
• BP.CF = 0, No building pressure control
• BP.CF = 1, constant volume two-stage exhaust based on
economizer position
• BP.CF = 2, Modulating building pressure control based on
building pressure sensor
• BP.CF = 3, VFD controlling two exhaust fan motors
• BP.CF = 4, VFD control of one of the two exhaust fan mo-
tors (sizes 075-100 with high-capacity exhaust option)
• BP.CF = 5, used on fan tracking mode
• BP.CF = 6, used on unit with return fan/power exhaust option
Building Pressure Sensor (BP.S)
This configuration allows the reading of a building pressure sensor
when enabled. This is automatically enabled when BP.CF = 2, 3,
4, 5, or 6.
Building Pressure (±) Range (BP.R)
This configuration establishes the range in in. wg that a 4 to
20 mA sensor will be scaled to. The control only allows sensors
that measure both positive and negative pressure.
Building Pressure SETP (BP.SP)
This set point is the building pressure control set point. If the unit
is configured for a type of modulating building pressure control,
then this is the set point that the control will control to.
BP Setpoint Offset (BP.SO)
For building pressure configurations BP.CF=2, 3, and 4, this is the
offset below the building pressure set point that the building pres-
sure must fall below to turn off power exhaust control.
Power Exhaust on Setp.1 (BP.P1)
When configured for building pressure control type BP.CF = 1
(constant volume two-stage control), the control will turn on the
first power exhaust fan when the economizer’s position exceeds
this set point.
Power Exhaust on Setp.2 (BP.P2)
When configured for building pressure control type BP.CF = 1
(constant volume two-stage control), the control will turn on the
second power exhaust fan when the economizer’s position ex-
ceeds this set point.
VFD/Act. Fire Speed/Pos (BP.FS)
For BP.CF = 2, 3, 4, and 5, this configuration is the VFD speed/
actuator position override when the control is in the purge and
evacuation smoke control modes.
VFD/Act. Min Speed/Pos (BP.MN)
For BP.CF = 2, 3, 4, and 5, this configuration is the minimum
VFD speed/actuator position during building pressure control.
VFD Maximum Speed/Pos (BP.MX)
For BP.CF = 3 and 5, this configuration is the maximum VFD
speed during building pressure control.
ITEM EXPANSION RANGE UNITS CCN POINT WRITE STATUS
ECN.P Economizer Act.Curr.Pos. 0 to 100 % ECONOPOS
EC2.P Economzr 2 Act.Curr.Pos. 0 to 100 % ECON2POS
ECN.C Economizer Act.Cmd.Pos. 0 to 100 % ECONOCMD forcible
ACTV Economizer Active? YES/NO ECACTIVE
DISA ECON DISABLING CONDITIONS
UNV.1 Econ Act. Unavailable? YES/NO ECONUNAV
UNV.2 Econ2 Act. Unavailable? YES/NO ECN2UNAV
ENTH Enth. Switch Read High? YES/NO ENTH
DBC DBC - OAT Lockout? YES/NO DBC_STAT
DEW DEW - OA Dewpt.Lockout? YES/NO DEW_STAT
DDBC DDBD- OAT > RAT Lockout? YES/NO DDBCSTAT
OAEC OAEC- OA Enth Lockout? YES/NO OAECSTAT
DEC DEC - Diff.Enth.Lockout? YES/NO DEC_STAT
EDT EDT Sensor Bad? YES/NO EDT_STAT
OAT OAT Sensor Bad? YES/NO OAT_STAT
FORC Economizer Forced? YES/NO ECONFORC
SFON Supply Fan Not On 30s? YES/NO SFONSTAT
CLOF Cool Mode Not In Effect? YES/NO COOL_OFF
OAQL OAQ Lockout in Effect? YES/NO OAQLOCKD
HELD Econ Recovery Hold Off? YES/NO ECONHELD
DH.DS Dehumid. Disabled Econ.? YES/NO DHDISABL
O.AIR OUTSIDE AIR INFORMATION
OAT Outside Air Temperature dF OAT forcible
OA.RH Outside Air Rel. Humidity % OARH forcible
OA.E Outside Air Enthalpy OAE
OA.D.T Outside Air Dewpoint Temp dF OADEWTMP
UNIT
CONSTANT
VOLUME
2-STAGE
MODULATING
POWER
EXHAUST
HIGH
CAPACITY
POWER
EXHAUST
a
a. Factory-installed option only.
RETURN/
EXHAUST
a
48/50P2,P4,P6,P8 XXX
b
b. Sizes 075-100 only.
X
48/50P3,P5,P7,P9 NA X X
b
X
LEGEND
X—Available as Factory Option
NA — Not Available on this Unit
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