ITEM
ECN. P
ECN. C
ACTV
DISA
UNAV
R.EC.D
DBC
DEW
DDBC
OAEC
DEC
EDT
OAT
FORC
SFON
CL OF
OAQL
HELD
DH.DS
O.AIR
OAT
OA.RH
OA.E
OA.D. T
Table 80 -- Economizer Run Status Table
EXPANSION
Economizer Act.Curr. Pos.
Economizer Act.Cmd. Pos.
Economizer Active ?
ECON DISABLING CONDITIONS
Econ Act. Unavailable?
Remote Econ. Disabled?
DBC - OAT Lockout?
DEW - OA Dewpt.Lockout?
DDBD- OAT > RAT Lockout?
0 100 RANGE
0_100
YES/NO
YES/NO
YES/NO
YES/NO
YES/NO
YES/NO
OAEC- OA Enth Lockout?
DEC - Diff. Enth.Lockout?
EDT Sensor Bad?
OAT Sensor Bad ?
Economizer Forced ?
Supply Fan Not On 30s ?
Cool Mode Not In Effect?
OAQ Lockout in Effect ?
Econ Recovery Hold Off?
Dehumid. Disabled Econ.?
OUTSIDE AIR INFORMATION
Outside Air Temperature
Outside Air Rel. Humidity
Outside Air Enthalpy
Outside Air Dewpoint Temp
YES/NO
YES/NO
YES/NO
YES/NO
YES/NO
YES/NO
YES/NO
YES/NO
YES/NO
YES/NO
I
I NITS CCN POINT
% ECONOPOS
% ECONOCMD
ECACTVE
ECONUNAV
ECONDISA
DBC STAT
DEW- STAT
DDBCSTAT
OAECSTAT
DEC_STAT
EDT_STAT
OAT STAT
ECONFORC
SFONSTAT
COOL OFF
OAQLOCKD
ECONHELD
DHDISABL
WRITE STATUS
forcible
dF OAT
% OARH
OAE
dF OADEWTMP
forcible
forcible
Building Pressure Config (BRCF) -- This configuration se-
lects the type of building pressure control.
• BR(T = 0, No building pressure control
• BR(T = 1, constant volume two-stage power exhaust
based on economizer position
• BR(T = 2, lnultiple stage building pressure control
based on a building pressure sensor
• BR(T = 3, VFD building pressure control based on a
building pressure sensor
Building Pressure PID Run Rate (BRRT) -- This configura-
tion selects the run thne of the PID algorithn. This configura-
tion is only active when BRCF = 3. It is recolrnnended that this
value not be changed without guidance from Service
Engineering.
Building Pressure Proportional Gain (BRP) -- This configura-
tion selects the proportional gain of the PID algorithin. This
configuration is only active when BRCF = 3. It is recolrnnend-
ed that this value not be changed without guidance from Service
Engineering.
Building Pressure Integral Gain (BR1) -- This configuration
selects the integral gain of the PID algorithin. This configuration
is only active when BRCF = 3. It is recolrnnended that this val-
ue not be changed without guidance from Service Engineering.
Building Pressure Derivative Gain (BRD) -- This configura-
tion selects the derivative gain of the PID algorithin. This con-
figuration is only active when BRCF = 3. It is recolrnnended
that this value not be changed without guidance from Service
Engineering.
Building Pressure Set Point Offset (BRSO) -- This configura-
tion is the value below the building pressure set point to which
the building pressure must fall in order to turn offpower exhaust
control. This configuration is only active when BRCF = 3.
Building Pressure Minhnurn Speed (BRMN) -- This configu-
ration is the minilnurn allowed VFD speed during building pres-
sure control. This configuration is only active when BRCF = 3.
Building Pressure Maxhnurn Speed (BRMX) -- This configu-
ration is the rnaxilnurn allowed VFD speed during building
pressure control. This configuration is only active when BRCF
=3.
VFD Fire Speed (BRFS) -- This configuration is the VFD
speed ovemde when the control is in the purge or evacuation
slnoke control modes. This configuration is only active when
BRCF = 3.
Power Exhaust Motors (BRMT) -- This configuration is ma-
chine dependent and instructs the building pressure control
algorithin as to whether the unit has 4 or 6 motors to control.
The motors are controlled by three power exhaust relays A, B,
and C. These relay outputs are located at the local display un-
der Ou_outs---_FANS---_PE.A,B, C
The following table illustrates the number of motors each
relay is in control of based on BRMT:
BP.MT PE A Relay PE B Relay PE C Relay
1 (4motors) 1 Motor 2Motors 1 Motor
2 (6motors) 1 Motor 2Motors 3Motors
Building Pressure Sensor (BRS) -- This configuration al-
lows the reading of a building pressure sensor when enabled.
This is automatically enabled whenBRCF = 2 or 3.
Building Pressure (+/-) Range (BRR) -- 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 (BRSP) -- This set point is the
building pressure control set point. If the unit is configured for
modulating building pressure control, then this is the set point
that the control will control to.
Power Exhaust on Setp. 1 (BRP1) -- When configured for
building pressure control type BRCF = 1 (constant volume two-
stage control), the control will turn on the first power exhaust
fan when the econornizer's position exceeds this set point.
Power Exhaust on Setp.1 (BRP2) -- When configured for
building pressure control type BRCF = 1 (constant volume two-
stage control), the control will turn on the second power exhaust
fan when the economizer's position exceeds this set point.
Modulating PE Algorithin Select (BRSL) -- This configuration
selects the algorithin used to step the power exhaust stages. This
lnust be set to 1 at all thnes. The other selections are not used.
Building Pressure PID Evaluation Time (BP. TM) -- This
configuration is the run time rate of the multiple stage (lnodu-
lating) power exhaust algorithin (BR(T=2).
Building Pressure Threshold Adjustment (BRZG) -- This
configuration is not used. It currently has no effect on building
pressure control.
High Building Pressure Level (BRHP) -- This configura-
tion is the threshold level above the building pressure set point
used to control stages of power exhaust when BRSL=I.
Low Building Pressure Level (BRLP) -- This configuration
is the threshold level below the building pressure set point used
to control stages of power exhaust when BRSL=I.
64
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