Unit Configuration Submenu - Carrier Weathermaster 48P030-100 Controls, Start-Up, Operation, Service, And Troubleshooting

HVAC Mode — SOFTSTOP REQUEST (3)
The unit is off due to a soft stop request from the control.
HVAC Mode — REM SW.DISABLE (4)
The unit is off due to the remote switch.
HVAC Mode — FAN STATUS FAIL (5)
The unit is off due to a supply fan status failure.
HVAC Mode — STATIC PRESSURE FAIL (6)
The unit is off due to failure of the static pressure sensor.
HVAC Mode — COMP.STUCK ON (7)
The unit is shut down because there is an indication that a com-
pressor is running even though it has been commanded off.
HVAC Mode — OFF (8)
The unit is off and no operating modes are active.
HVAC Mode — TEST (9)
The unit is in the self test mode which is entered through the Ser-
vice Test menu.
HVAC Mode — TEMPERING VENT (10)
The economizer is at minimum vent position but the supply-air
temperature has dropped below the tempering vent set point.
Staged gas heat, modulating gas heat, SCR electric heat, or hy-
dronic heat is used to temper the ventilation air.
HVAC Mode — TEMPERING LOCOOL (11)
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. Staged gas heat, modulating gas heat, SCR electric heat, or
hydronic heat is used to temper the ventilation air.
HVAC Mode — TEMPERING HICOOL (12)
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. Staged gas heat, modulating gas heat, SCR electric heat, or
hydronic heat is used to temper the ventilation air.
HVAC Mode — VENT (13)
This is a normal operation mode where no heating or cooling is re-
quired and outside air is being delivered to the space to control
IAQ levels.
HVAC Mode — LOW COOL (14)
This is a normal cooling mode where a low cooling demand is
present.
HVAC Mode — HIGH COOL (15)
This is a normal cooling mode where a high cooling demand is
present.
HVAC Mode — LOW HEAT (16)
The unit will be in low heating demand mode using gas, electric,
or hydronic heat.
HVAC Mode — HIGH HEAT (17)
The unit will be in high heating demand mode using gas, electric,
or hydronic heat.
HVAC Mode — UNOCC. FREE COOL (18)
In this mode the unit will operate in cooling but will be using the
economizer for free cooling. Entering this mode will depend on
the status of the outside air. The unit can be configured for outside
air dry bulb changeover, differential dry bulb changeover, outside
air enthalpy changeover, differential enthalpy changeover, or a
custom arrangement of enthalpy/dew point and dry bulb. See the
Economizer section on page 75 for further details.
HVAC Mode — FIRE SHUT DOWN (19)
The unit has been stopped due to a fire shutdown input (FSD)
from two or more of the fire control modes, purge, evacuation, or
pressurization.
HVAC Mode — PRESSURIZATION (20)
The unit is in the special fire pressurization mode where the sup-
ply fan is on, the economizer damper is open, and the power ex-
haust fans are off. This mode is invoked by the Fire Pressurization
(PRES) input which can be found in the INPUTFIRE submenu.
HVAC Mode — EVACUATION (21)
The unit is in the special Fire Evacuation mode where the supply
fan is off, the economizer damper is closed, and the power ex-
haust fans are on. This mode is invoked by the Fire Evacuation
(EVAC) input which can be found in the INPUTFIRE submenu.
HVAC Mode — SMOKE PURGE (22)
The unit is in the special Fire Purge mode where the supply fan
is on, the economizer damper is open, and the power exhaust
fans are on. This mode is invoked by the Fire Evacuation
(PURG) input which can be found in the INPUTFIRE submenu.
HVAC Mode — COOLING DEHUM (23)
The unit is operating in the Cooling Dehumidification mode. On
units configured for Humidi-MiZer operation, this is the Humidi-
MiZer dehumidification mode (subcooling).
HVAC Mode — VENTING DEHUM (24)
The unit is operating in Venting Dehumidification mode. On units
configured for Humidi-MiZer operation, this is the Humidi-MiZer
reheat mode.
HVAC Mode — FREEZESTAT TRIP (25)
If the freezestat trips, the unit enters the Freezestat Trip HVAC
mode. The supply fan will run, the hydronic heat valve will be
wide open, and the economizer damper will be closed.
HVAC Mode — PLEN.PRESS.FAIL (26)
The unit is off due to a failure of the plenum pressure switch.
HVAC Mode — RCB COMM FAILURE (27)
The unit is off due to a Rooftop Control Board (RCB) communi-
cation failure.
HVAC Mode — SUPPLY VFD FAULT (28)
The unit is off due to a supply fan VFD fault or supply fan VFD
communications loss.
HVAC Mode — HEATING DEHUMID (29)
The unit is operating in the Heating Dehumidification mode.

Unit Configuration Submenu

The UNIT sub-menu under the Configuration mode of the local
display contains general unit configuration items. This section
will define all of these configurations here for easy reference.
The sub-menu which contains these configurations is located at
the local display under Configuration
Machine Control Type (C.TYP)
This configuration defines the technique and control source re-
sponsible for selecting a cooling, heating, or vent mode and in de-
termining the method by which compressors are staged. The con-
trol types are:
• C.TYP = 1 (VAV-RAT) and C.TYP = 2 (VAV-SPT)
Both of these configurations refer to standard VAV opera-
tion. If the control is occupied, the supply fan is run con-
tinuously and return-air temperature will be used in the de-
termination of the selection of a cooling or heating mode.
VAV-SPT differs from VAV-RAT only in that, during the
unoccupied period, space temperature will be used instead
of return-air temperature to start the fan for 10 minutes to
establish an accurate return-air temperature before the re-
turn-air temperature is allowed to call out any mode.
46

UNIT. See Table 32.