64
Table 66 — Building Pressure Configuration
*Some configurations are machine dependent.
Table 67 — Power Exhaust Staging (
BP.CF
= 1)
Table 68 — Power Exhaust Staging (
BP.CF
= 2)
VFD POWER EXHAUST BUILDING PRESSURE CON-
TROL (
BP.CF
= 3) — A 4 to 20 mA analog output from
Economizer Control Board 1 (ECB-1, AO1) is provided as a
speed reference for a field-installed VFD power exhaust
accessory. If building pressure (
Pressures
AIR.P
BP
) rises
above the building pressure setpoint (
BP.SP
) and the supply
fan is on, then building pressure control is initialized. Thereaf-
ter, if the supply fan relay goes off or if the building pressure
drops below the
BP.SP
minus the building pressure setpoint
offset (
BP.SO
) for 5 continuous minutes, building pressure
control will be stopped. The 5-minute timer will continue to
reinitialize if the VFD is still commanded to a speed > 0%. If
the building pressure falls below the setpoint, the VFD will
slow down automatically. Control is performed with a PID
loop where:
Error = BP –
BP.SP
K = 1000 *
BP.RT
/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
ITEM
EXPANSION
RANGE
UNITS
CCN POINT
DEFAULT
BP
BUILDING PRESS. CONFIG
BP.CF
Building Press. Config
0-3
BLDG_CFG
0*
BP.RT
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
BP.SO
BP Setpoint Offset
0.0 - 0.5
" H2O
BPSO
0.05
BP.MN
BP VFD Minimum Speed
0-100
%
BLDGPMIN
10
BP.MX
BP VFD Maximum Speed
0-100
%
BLDGPMAX
100
BP.FS
VFD/Act. Fire Speed/Pos.
0-100
%
BLDGPFSO
100
BP.MT
Power Exhaust Motors
1-2
PWRM
1*
BP.S
Building Pressure Sensor
Enable/Dsable
BPSENS
Dsable*
BP.R
Bldg Press (+/–) Range
0 - 1.00
" H2O
BP_RANGE
0.25
BP.SP
Building Pressure Setp.
-0.25 -> 0.25
" H2O
BPSP
0.05
BP.P1
Power Exhaust On Setp.1
0 - 100
%
PES1
35
BP.P2
Power Exhaust On Setp.2
0 - 100
%
PES2
75
B.CFG
BP ALGORITHM CONFIGS
BP.SL
Modulating PE Alg. Slct.
1-3
BPSELECT
1
BP.TM
BP PID Evaluation Time
0 - 10
min
BPPERIOD
1
BP.ZG
BP Threshold Adjustment
0.1 - 10.0
" H2O
BPZ_GAIN
1
BP.HP
High BP Level
0 - 1.000
" H2O
BPHPLVL
0.05
BP.LP
Low BP Level
0 - 1.000
" H2O
BPLPLVL
0.04
BP.MT
= 1 (4 motors)
PE.A
PE.B
PE.C
Power Exhaust Stage 0
OFF
OFF
OFF
Power Exhaust Stage 1
OFF
ON
OFF
Power Exhaust Stage 2
ON
ON
ON
BP.MT
= 2 (6 motors)
PE.A
PE.B
PE.C
Power Exhaust Stage 0
OFF
OFF
OFF
Power Exhaust Stage 1
OFF
OFF
ON
Power Exhaust Stage 2
ON
ON
ON
BP.MT
= 1 (4 motors)
PE.A
PE.B
PE.C
Power Exhaust Stage 0
OFF
OFF
OFF
Power Exhaust Stage 1
ON
OFF
OFF
Power Exhaust Stage 2
OFF
ON
OFF
Power Exhaust Stage 3
ON
ON
OFF
Power Exhaust Stage 4
ON
ON
ON
BP.MT
= 2 (6 motors)
PE.A
PE.B
PE.C
Power Exhaust Stage 0
OFF
OFF
OFF
Power Exhaust Stage 1
ON
OFF
OFF
Power Exhaust Stage 2
OFF
ON
OFF
Power Exhaust Stage 3
ON
ON
OFF
Power Exhaust Stage 4
ON
OFF
ON
Power Exhaust Stage 5
OFF
ON
ON
Power Exhaust Stage 6
ON
ON
ON
Summary of Contents for Carrier Weathermaker 48A2
Page 105: ...105 Fig 20 Typical Main Control Box Wiring Schematic 48 50A2 A3 A4 A5 Units...
Page 106: ...106 Fig 21 Typical Auxiliary Control Box Wiring Schematic...
Page 107: ...107 Fig 22 Typical 2 Stage Gas Heat Wiring Schematic Size 060 Units Shown a48 8357...
Page 108: ...108 TO NEXT PAGE Fig 23 Typical Staged Gas Heat Wiring Schematic Size 060 Units Shown A48 7296...
Page 109: ...109 Fig 23 Typical Staged Gas Heat Wiring Schematic Size 060 Units Shown cont A48 8358...
Page 110: ...110 Fig 24 Typical Electric Heat Control Schematic 50 Series Size 060 Units Shown a50 8228...
Page 111: ...111 Fig 25 Typical Power Schematic 48 50A2 A3 A4 A5 060 Unit Shown...
Page 112: ...112 Fig 26 Typical Low Ambient Controls Option Wiring...
Page 113: ...113 Fig 27 Typical Small Chassis Component Location Size 020 035 Units...
Page 114: ...114 Fig 28 Typical Large Chassis Component Locations Size 040 060 Units...
Page 118: ...118 Fig 30 Economizer Control Board ECB1 and VAV Control Board ECB2 A48 7706...
Page 142: ...142 A48 3733 Fig 56 Main Burner Removal...
Page 176: ...176 APPENDIX C VFD INFORMATION cont Fig F Internal Enclosure Fan Replacement A48 7716...
