241
APPENDIX E
—
MODE SELECTION PROCESS
The following section is to be used in conjunction with the Mode
Selection figure on page 41. To help determine why the unit con
-
trols are in a certain mode, the programming logic is provided be
-
low. The software will proceed, step by step, until a mode is
reached. If an “If” statement is true, then that mode will be en
-
tered. The “Else” statement refers to other possible choices.
If the System Mode is OFF:
{
If the fire shut down input
(
Inputs
FIRE
FSD
)
is in “alarm”:
HVAC mode:
("Fire Shut Down")
OFF
Else
HVAC mode:
("Disabled")
OFF
}
Else If: The rooftop is not in “factory test” and a fire
smoke-control mode is “alarming”:
{
If the pressurization input (
Inputs
FIRE
PRES
)
is in “alarm”:
HVAC mode:
("Pressurization")
Else If: The evacuation input (
Inputs
FIRE
EVAC
)
is in “alarm”:
HVAC mode:
("Evacuation")
Else If: The smoke purge input (
Inputs
FIRE
PURG
)
is in “alarm”:
HVAC mode:
("Smoke Purge")
}
Else If: Someone changed the machine’s
control type (
Configuration
UNIT
C.TYP
) during
run time, a 15-second delay is called out:
{
HVAC mode:
("Disabled")
OFF
}
Else If: The System Mode is TEST:
{
HVAC mode:
("Test")
}
Else If: The “soft stop” command (
Service Test
S.STP
)
is
forced to
YES
:
{
HVAC mode:
("SoftStop Request")
}
Else If: The remote switch configuration (
Configuration
UNIT
RM.CF
)=
2; “start/stop”, and the remote
input state (
Inputs
GEN.I
REMT
)=ON:
{
HVAC mode:
("Rem. Sw. Disable")
OFF
}
Else If: Configured for hydronic heat (
Configuration
HEAT
HT.CF
=4) or configured for dehumidification
with modulating valve reheat (
Configuration
DEHU
D.SEL
=1) and the freeze stat switch trips
(
Inputs
GEN.I
FRZ.S
= ALRM):
{
HVAC mode:
("Freeze Stat Trip")
}
Else If: Configured for static pressure control
(
Configuration
SP
SP.CF
= 1,2
) and the static
pressure sensor (
Pressures
AIR.P
SP
) fails:
{
HVAC mode:
("Static Pres.Fail")
OFF
}
Else If: Configured for supply fan status monitoring
(
Configuration
UNIT
SFS.M
= 1,2
) and
configured to shut the unit down on fan status fail
(
Configuration
UNIT
SFS.S
= YES) and a fan status
failure occurs:
{
HVAC mode:
("Fan Status Fail")
OFF
Else If: Configured for return fan tracking
(
Configuration
BP
BP.CF =
2) and there is a plenum
pressure switch error (
Inputs
GEN.I
PP.SW
=HIGH):
HVAC mode:
("Plen.Press.Fail")
OFF
}
Else If: Configured for power monitoring
(
Configuration
UNIT
PW.MN)
= YES and there is a
power error
(Input
GEN.I
PWR.F
=ALRM):>
{
HVAC mode:
("3-Phase Pwr Fail")
OFF
}
Else If: The unit is a VAV unit with a supply duct pressure
sensor and measured supply duct static pressure
(
Pressures
AIR.P
SP
) is above the configurable SP
Low Alert Limit (
Configuration
IAQ
ALLM
SP.H
):
{
HVAC mode:
("Duct Static Pres") OFF
}
Else If: There is an air pressure safety switch error
(
Inputs
GEN.I
SP.SS
=HIGH):
{
HVAC mode:
("Air.Pres.Sw.Fail"
) OFF
}
Else If: There is a VFD1 fault detected (
Run Status
VFDS
S.VFD
LCF
0) or
There is VFD1 communications failure and the supply fan
is not in bypass mode (
Inputs
GEN.I
SF.BY
=OFF):
{
HVAC mode:
("Supply VFD Fault")
OFF
}
Else If: There is an RCB1 communications failure:
{
HVAC mode:
("RCB comm failure")
OFF
}
Else If: The unit is just waking up from a power reset:
{
HVAC mode:
("Starting Up")
OFF
}
Else If: A compressor is diagnosed as being "Stuck On":
{
HVAC mode:
("Comp. Stuck On")
}
Else: The control is free to select the normal heating/cooling
HVAC modes:
{
Содержание WeatherExpert 48N2
Страница 135: ...135 Fig 18 48 50N Typical Power Schematic Nominal 075 Ton Unit Shown ...
Страница 136: ...136 Fig 19 48 50N Typical Power Schematic Nominal Ton 90 150 Units Shown ...
Страница 137: ...137 Fig 20 48 50N Main Base Board Input Output Connections ...
Страница 138: ...138 Fig 21 48 50N RXB EXB CEM Input Output Connections a48 9307 ...
Страница 139: ...139 Fig 22 48 50N EXV SCB Input Output Connections a48 9308 ...
Страница 140: ...140 Fig 23 48N Typical Modulating Gas Heat Unit Control Wiring ...
Страница 141: ...141 Fig 24 50N Typical Electric Heat Unit Control Wiring ...
Страница 144: ...144 Fig 27 48N Typical Gas Heat Section Wiring Nominal Ton 120 to 150 Units ...
Страница 145: ...145 Fig 28 48 50N Typical Power Component Control Wiring 460 v ...
Страница 146: ...146 Fig 29 48 50N Component Control Wiring 575 v Nominal Ton 075 to 150 Units ...
Страница 147: ...147 Fig 30 48 50N Component Arrangement Power Box ...
Страница 148: ...148 Fig 31 48 50N Component Arrangement Control Box ...
Страница 168: ...168 Fig 47 Sensor and Ignition Position Fig 48 Combustion Blower Details SENSOR DETAILS IGNITION DETAILS ...
Страница 240: ...240 APPENDIX D VFD INFORMATION CONT Fig G VFD Bypass Wiring Diagram WHEN USED ...
