226
APPENDIX E — MODE SELECTION PROCESS
The following section is to be used in conjunction with Fig. 4
on page 43. To help determine why the unit controls are in a
certain mode, the programming logic is provided below. The
software will proceed, step by step, until a mode is reached. If
an “If” statement is true, then that mode will be entered. 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 config (
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)
{
HVAC mode:
(“Fan Status Fail ”)
OFF
Else If: Configured for return fan tracking
(
Configuration
BP
BP.CF =
5) and there is a
plenum pressure switch error
HVAC mode:
(“Plen.Press.Fail ”)
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:
}
HVAC mode:
(“Off ”)
— The unit is off and no operating modes are active.
HVAC mode:
(“Tempering Vent ”)
— The economizer is at minimum vent position but
the supply air temperature has dropped below the
tempering vent set point. Gas or hydronic heat is
used to temper the ventilation air.
HVAC mode:
(“Tempering LoCool”)
— The economizer is at minimum vent position but
the combination of the outside-air temperature and
the economizer position has dropped the supply-air
temperature below the tempering cool set point.
Gas or hydronic heat is used to temper the
ventilation air.
HVAC mode:
(“Tempering HiCool”)
— The economizer is at minimum vent position but
the combination of the outside air temperature and
the economizer position has dropped the supply air
temperature below the tempering cool set point.
Gas or hydronic heat is used to temper the
ventilation air.
HVAC mode:
(“Re-Heat ”)
—
The unit is operating in dehumidification with a
reheat device.
HVAC mode:
(“Dehumidification”)
—
The unit is operating in the Dehumidification
mode.
HVAC mode:
(“Vent ”)
—
This is a normal operation mode where no heating
or cooling is required and outside air is being
delivered to the space to control IAQ levels.
HVAC mode:
(“Low Cool ”)
Summary of Contents for Weathermaster 48P2030-100
Page 130: ...130 Fig 19 Typical Power Schematic Sizes 040 075 Shown ...
Page 131: ...131 Fig 20 Main Base Board Input Output Connections ...
Page 132: ...132 Fig 21 RXB EXB CEM SCB Input Output Connections ...
Page 133: ...133 Fig 22 Typical Gas Heat Unit Control Wiring 48P030 100 Units Shown ...
Page 134: ...134 Fig 23 Typical Electric Heat Wiring 50P030 100 Units Shown ...
Page 135: ...135 Fig 24 Typical Power Wiring 115 V ...
Page 136: ...136 Fig 25 Typical Gas Heat Section Size 030 050 Units Shown ...
Page 138: ...138 Fig 27 Component Arrangement Size 030 035 Units ...
Page 139: ...139 Fig 28 Component Arrangement Size 040 075 Units ...
Page 140: ...140 Fig 29 Component Arrangement Size 090 100 Units ...
