71
Table 58 — Building Pressure Configuration
*Some configurations are model number dependent.
Configuration
→
BP
→
BP.CF = 2 (Modulating Power Exhaust)
— Control is accomplished with two LEN communicating
actuators in tandem and one exhaust fan relay. If building
pressure (Pressures
→
AIR.P
→
BP) rises above the building
pressure set point (BP.SP) and the supply fan is on, building
pressure control is initialized. Thereafter, if the supply fan relay
goes off or if the building pressure drops below the BP.SP
minus the building pressure set point offset (BP.SO) for 5
continuous minutes, building pressure control will be stopped.
Any time building pressure control becomes active, the exhaust
fan relay turns on, starting the dual exhaust fan motors. After
the exhaust fan relay turns on, control is performed with a PID
loop where:
Error = BP – BP.SP
K = 1000 * BP.TM / 60 (normalize the PID control for run rate)
P = K * BP.P * (error)
I = K * BP.I * (error) + “I” calculated last time through the PID
D = K * BP.D * (error – error computed last time through the
PID)
Power exhaust control signal (limited between BP.MN and
(BP.1M/BP.2M) %) = P + I + D
Configuration
→
BP
→
BP.CF = 3 (VFD Controlling Exhaust
Fan Motors) — The 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 (Pressures
→
AIR.P
→
BP) rises
above the building pressure set point (BP.SP) and the supply fan
is on, then building pressure control is initialized. Thereafter, if
the supply fan relay goes off or if the building pressure drops be-
low the BP.SP minus the building pressure set point offset
(BP.SO) for 5 continuous minutes, building pressure control
will be stopped. The 5-minute timer will continue to re-initialize
while the VFD is commanded to a position > 0%. If the building
pressure falls below the set point, the VFD will slow down auto-
matically. Any time building pressure control becomes active,
the exhaust fan relay turns on which energizes the exhaust fan
VFD. Control is performed with a PID loop where:
Error = BP – BP.SP
K = 1000 * BP.TM/60 (normalize the PID control for run rate)
P = K * BP.P * (error)
I = K * BP.I * (error) + “I” calculated last time through the PID
D = K * BP.D * (error – error computed last time through the
PID)
VFD control signal (clamped between BP.MN and BP.MX%)
= P + I + D
NOTE: Do not change values of PID set point without
approval from Carrier.
BP.CF = 4 (High-Capacity Exhaust Control) — Control is
accomplished with a VFD and two exhaust fan relays. 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 ) and a second power exhaust
relay (Outputs
→
FANS
→
P. E . 2 ) which controls a single speed
fan which is equal in capacity to the VFD running at full speed.
ITEM EXPANSION RANGE UNITS CCN POINT DEFAULT
BP BUILDING PRESS. CONFIGS
BP.CF Building Press. Config 0 - 5 BLDG_CFG 0*
BP.S Building Pressure Sensor Enable/Disable BPSENS Disable*
BP.R Bldg. Press. (+/-) Range 0.10 - 0.25 "H2O BP_RANGE 0.25
BP.SP Building Pressure Setp. -0.25 - 0.25 "H2O BPSP 0.05
BP.SO BP Setpoint Offset 0 - 0.5 "H2O BPSO 0.05
BP.P1 Power Exhaust On Setp.1 0 - 100 % PES1 25
BP.P2 Power Exhaust On Setp.2 0 - 100 % PES2 75
B.V.A VFD/ACTUATOR CONFIG
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
BP.1M BP 1 Actuator Max Pos. 85 - 100 % BP1SETMX 100
BP.2M BP 2 Actuator Max Pos. 85 - 100 % BP2SETMX 100
BP.CL BP Hi Cap VFD Clamp Val. 5 - 25 % BLDGCLMP 10
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 -20000 - 20000 CFM DCFMSTRT 2000
FT.MX Fan Track Max Clamp 0 - 20000 CFM DCFM_MAX 4000
FT.AD Fan Track Max Correction 0 -20000 CFM DCFM_ADJ 1000
FT.OF Fan Track Internl EEPROM -20000 - 20000 CFM DCFM_OFF 0
FT.RM Fan Track Internal RAM -20000 - 20000 CFM DCFM_RAM 0
FT.RS Fan Track Reset Internal Yes/No DCFMRSET No
SCF.C Supply Air CFM Config 1 - 2 SCFM_CFG 1
B.PID BLDG.PRESS.PID CONFIGS
BP.TM Bldg.Pres.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
ACT.C BLDG.PRES. ACTUATOR CFGS
BP.1 BLDG.PRES. ACT.1 CONFIGS
SN.1 BP 1 Serial Number 1 0 - 255 BP_1_SN1 0
SN.2 BP 1 Serial Number 2 0 - 255 BP_1_SN2 0
SN.3 BP 1 Serial Number 3 0 - 255 BP_1_SN3 0
SN.4 BP 1 Serial Number 4 0 - 255 BP_1_SN4 0
SN.5 BP 1 Serial Number 5 0 - 255 BP_1_SN5 0
C.A.LM BP1 Cntrl Angle Lo Limit 0-90 BP1_CALM 35
BP.2 BLDG.PRES. ACT.2 CONFIGS
SN.1 BP 2 Serial Number 1 0 - 255 BP_2_SN1 0
SN.2 BP 2 Serial Number 2 0 - 255 BP_2_SN2 0
SN.3 BP 2 Serial Number 3 0 - 255 BP_2_SN3 0
SN.4 BP 2 Serial Number 4 0 - 255 BP_2_SN4 0
SN.5 BP 2 Serial Number 5 0 - 255 BP_2_SN5 0
C.A.LM BP2 Cntrl Angle Lo Limit 0-90 BP2_CALM 35