81
Table 56 — Building Pressure Control Table
* Some configurations are model number dependent.
VFD Maximum Speed/Pos. (BP.MX) — For BP.CF = 1 and
2, this configuration is the maximum VFD speed during build-
ing pressure operation above which the VFD may not control.
Fan Track Learn Enable (
FT.CF) — For BP.CF = 2, this re-
turn/exhaust control configuration selects whether the "fan
tracking" algorithm will make corrections over time and add a
"learned" offset to FT.ST. If this configuration is set to NO, the
unit will try to control the delta cfm value between the suppy
and return VFDs only based on FT.ST.
Fan Track Learn Rate (
FT.TM) — For BP.CF = 2, this re-
turn/exhaust control configuration is a timer whereby correc-
tions to the delta cfm operation are made. The smaller this val-
ue, the more often corrections may be made based on building
pressure error. This configuration is only valid when FT.CF =
Yes .
Fan Track Initial DCFM (
FT.ST) — For BP.CF = 2, this re-
turn/exhaust control configuration is the start point upon which
corrections (offset) is made over time when FT.CF = Yes and
is the constant control point for delta cfm control when FT.CF
= No.
Fan Track Max Clamp (
FT.MX) — For BP.CF = 2, this re-
turn/exhaust control configuration is the maximum positive
delta cfm control value allowed unless outdoor air cfm control
is available and then the delta cfm control value would be
clamped to the outdoor air cfm value directly (see the Econo-
mizer section for a description of outdoor air cfm configura-
tion).
Fan Track Max Correction (
FT.AD) — For BP.CF = 2, this
return/exhaust control configuration is the max correction that
is possible to be made every time a correction is made based on
FT.TM. This configuration is only valid when FT.CF = Yes.
Fan Track Internal EEPROM (
FT.OF) — For BP.CF = 2,
this return/exhaust control internal EEPROM value is a learned
correction that is stored in non-volatile RAM and adds to the
offset when FT.CF = Yes. This value is stored once a day after
the first correction. This configuration is only valid when
FT.CF = Yes.
Fan Track Internal RAM (
FT.RM) — For BP.CF = 5, this
return/exhaust control internal value is not a configuration but a
run time correction that adds to the offset when FT.CF = Yes
throughout the day. This value is only valid when FT.CF =
Yes .
Fan Track Reset Internal (
FT.RS) — This option is a one
time reset of the internal RAM and internal EEPROM stored
offsets. If the system is not set up right and the offsets are incor-
rect, this "learned" value can be reset.
Supply Air CFM Configuration (
SCF.C) — This configura-
tion is set at the factory depending on whether a high or low
supply fan is installed. This information is then used by the
control to determine the correct cfm tables to be used when
measuring supply air cfm.
Return/Exhaust Air CFM Configuration (
REF.C) — This
configuration is set at the factory depending on whether a high
or low return fan is installed. This information is then used by
the control to determine the correct cfm tables to be used when
measuring return or exhaust air cfm.
Supply Air CFM Sensor (
SCF.S) — This configuration al-
lows the reading of supply air cfm when enabled.
Return Air CFM Sensor (
RCF.S) — This configuration al-
lows the reading of return air cfm when enabled. This sensor
and ECF.S share the same analog input so are mutually exclu-
sive.
Exhaust Air CFM Sensor (
ECF.S) — This configuration al-
lows the reading of exhaust air cfm when enabled. This sensor
and RCF.S share the same analog input so are mutually exclu-
sive.
Building Pressure Run Rate (
BP.TM) — For BP.CF = 1 and
2, this configuration is the PID run time rate.
Building Pressure Proportional Gain (
BP.P) — For BP.CF =
1 and 2, this configuration is the PID Proportional Gain.
Building Pressure Integral Gain (
BP.I) — For BP.CF = 1 and
2, this configuration is the PID Integral Gain.
Building Pressure Derivative Gain (
BP.D) — For BP.CF = 1
and 2, this configuration is the PID Derivative Gain.
BUILDING PRESSURE CONTROL BASED ON BP.CF
VFD Controlling Exhaust Fan Motors (
BP.CF =1) — VFD
controlling high capacity power exhaust consists of an exhaust
fan VFD (Outputs
FANS
E.VFD) enabled by one power
exhaust relay (Outputs
FANS
P. E . 1 ). If building pressure
ITEM EXPANSION RANGE UNITS CCN POINT WRITE STATUS
BP BUILDING PRESSURE CONFIGURATIONS
BP.CF Building Pressure Configuration 0 - 3 BLDG_CFG 0*
BP.S Building Pressure Sensor Enable/Disable BPSENS Disable*
BP.R Building Pressure (+/-) Range 0.10 - 0.25 H20 BP_Range 0.25
BP.SP
Building Pressure Setp. –0.25 - 0.25 H20 BPSP 0.05
BP.SO BP Setpoint Offset 0 - 0.5 H20 BPSO 0.05
B.V.A VFD CONFIGURATION
BP.FS VFD/Act. Fire Speed/Pos. 0 - 100 % BLDGPFSO 100
BP.MN VFD/Act. Min. Speed/Pos. 0 - 50 % BLDGPMIN 10
BP.MX VFD Maximum Speed 50 - 100 % BLDGPMAX 100
FAN.T FAN TRACKING CONFIG
FT.CF Fan Track Learn Enable Yes/No DCFM_CFG No
FT.TM Fan Track Learn Rate 5 - 60 min DCFMRATE 15
FT.ST Fan Track Initial DCFM –20,000 - 20,000 CFM DCFMSTRT 2000
FT.MX Fan Track Max Clamp 0 - 20,000 CFM CDCFM_MAX 4000
FT.AD Fan Track Max Correction 0 - 20,000 CFM DCFM_ADJ 1,000
FT.OF Fan Track Internal EEPROM –20,000 - 20,000 CFM DCFM_OFF 0
FT.RM Fan Track Internal RAM –20,000 - 20,000 CFM DCFM_RAM 0
FT.RS Fan Track Reset Internal Yes/No DCFMRSET No
FAN.C SUPPLY, RETURN FAN CFG
SCF.C Supply Air CFM Config 1 - 2 SCFM_CFG 2
REF.C Return/Exhaust Air CFM Config. 1 - 2 RCFM_CFG 2
SCF.S Supply Air CFM Sensor Enable/Disable SCFMSENS Disable*
RCF.S Return Air CFM Sensor Enable/Disable RCFMSENS Disable*
ECF.S Exhaust Air CFM Sensor Enable/Disable ECFMSENS Disable*
B.PID BLDG. PRESS. PID CONFIGURATIONS
BP.TM Bldg. Press. PID Run Rate 5 - 120 sec BPIDRATE 10
BP.P Bldg. Press. Prop. Gain 0 - 5 BLDGP_PG 0.5
BP.I Bldg. Press. Integ. Gain 0 - 2 BLDGP_IG 0.5
BP.D Bldg. Press. Deriv. Gain 0 - 5 BLDGP_DG 0.3
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