Carrier WEATHERMASTER 48/50Z030-105 User Manual
Page 71
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