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ITEM
ECN.P
Economizer Act.Curr.Pos.
EC2.P
Economzr 2 Act.Curr.Pos.
ECN.C
Economizer Act.Cmd.Pos.
ACTV
Economizer Active?
DISA
ECON DISABLING CONDITIONS
UNV.1
Econ Act. Unavailable?
UNV.2
Econ2 Act. Unavailable?
ENTH
Enth. Switch Read High?
DBC
DBC - OAT Lockout?
DEW
DEW - OA Dewpt.Lockout?
DDBC
DDBD- OAT > RAT Lockout?
OAEC
OAEC- OA Enth Lockout?
DEC
DEC - Diff.Enth.Lockout?
EDT
EDT Sensor Bad?
OAT
OAT Sensor Bad?
FORC
Economizer Forced?
SFON
Supply Fan Not On 30s?
CLOF
Cool Mode Not In Effect?
OAQL
OAQ Lockout in Effect?
HELD
Econ Recovery Hold Off?
DH.DS
Dehumid. Disabled Econ.?
O.AIR
OUTSIDE AIR INFORMATION
OAT
Outside Air Temperature
OA.RH
Outside Air Rel. Humidity
OA.E
Outside Air Enthalpy
OA.D.T
Outside Air Dewpoint Temp
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.
CONSTANT
UNIT
VOLUME
2-STAGE
48/50P2,P4,P6,P8
X
48/50P3,P5,P7,P9
NA
NOTE(S):
a. Factory-installed option only.
b. Sizes 075-100 only.
LEGEND
X
— Available as Factory Option
NA
— Not Available on this Unit
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
Table 67 — Economizer Run Status Table
EXPANSION
HIGH
MODULATING
CAPACITY
RETURN/
POWER
POWER
EXHAUST
EXHAUST
EXHAUST
a
X
X
b
X
X
b
RANGE
UNITS
0 to 100
%
0 to 100
%
0 to 100
%
YES/NO
YES/NO
YES/NO
YES/NO
YES/NO
YES/NO
YES/NO
YES/NO
YES/NO
YES/NO
YES/NO
YES/NO
YES/NO
YES/NO
YES/NO
YES/NO
YES/NO
dF
%
dF
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)
a
This set point is the building pressure control set point. If the unit
is configured for a type of modulating building pressure control,
X
then this is the set point that the control will control to.
X
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.
83
CCN POINT
WRITE STATUS
ECONOPOS
ECON2POS
ECONOCMD
forcible
ECACTIVE
ECONUNAV
ECN2UNAV
ENTH
DBC_STAT
DEW_STAT
DDBCSTAT
OAECSTAT
DEC_STAT
EDT_STAT
OAT_STAT
ECONFORC
SFONSTAT
COOL_OFF
OAQLOCKD
ECONHELD
DHDISABL
OAT
forcible
OARH
forcible
OAE
OADEWTMP
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Troubleshooting
