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EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER
101 74-2958—1
DestEmergCmd nviEmerg
(SNVT_hvac_emerg)
EMERG_NORMAL
EMERG_PRESSURIZE
EMERG_DEPRESSURIZE
EMERG_PURGE
EMERG_SHUTDOWN
EMERG_NUL
0
1
2
3
4
255
EMERG_NORMAL M X X X X Emerg is an emergency input from a device that determines the correct
action during a given emergency (such as a fire). If Emerg is
EMERG_NORMAL the fan and economizer damper are controlled by the
heating and cooling control algorithm. If Emerg is EMERG_PRESSURIZE,
then the fan is controlled on and the economizer damper is open. If Emerg
is EMERG_DEPRESSURIZE, then the fan is controlled on and the
economizer damper is closed. If Emerg is EMERG_SHUTDOWN, then the
fan is controlled off and the economizer damper is closed. If Emerg is
EMERG_PURGE, the fan and damper go to the state specified by
Config.SmokeControl. If Emerg is not configured then it is set to
EMERG_NUL.
SrcUnitStatus nvoUnitStatus
(SNVT_hvac_status)
mode HVAC_AUTO
HVAC_HEAT
HVAC_MRNG_WRMUP
HVAC_COOL
HVAC_NIGHT_PURGE
HVAC_PRE_COOL
HVAC_OFF
HVAC_TEST
HVAC_EMERG_HEAT
HVAC_FAN_ONLY
HVAC_NUL
0
1
2
3
4
5
6
7
8
9
255
HVAC_NUL M X X Mode is set according to the Data1.mode. If Data1.mode is
START_UP_WAIT, SMOKE_EMERGENCY, or FREEZE_PROTECT, mode
is set to HVAC_NUL which indicates that the node is in a mode not
supported by the SNVT_hvac_mode data type. If Data1.mode is HEAT,
then mode is set to HVAC_HEAT which indicates that heating energy is
being supplied to the controlled space. If Data1.mode is COOL, then mode
is set to HVAC_COOL, which indicates that cooling energy is being
supplied to the controlled space. If Data1.mode is OFF_MODE or
DISABLED_MODE, then mode is set to HVAC_OFF which indicates that
the node is not running its normal temperature control and the outputs are
not turned off. If Data1.mode is EMERG_HEAT, mode is set to
HVAC_EMERG_HEAT where, in a heat pump application, the compressor
stages are disabled and only auxiliary heating stages are turned on. If
Data1.mode is MANUAL or FACTORY_TEST, mode is set to HVAC_TEST
which indicates that the node is in a manual or test mode. If Data1.mode is
FAN_ONLY, mode is set to HVAC_FAN_ONLY which indicates that the fan
is running but the space temperature control is turned off.
nvoUnitStatus
(SNVT_hvac_status)
heat_output_primary Percentage
0 to 100
0 heat_output_primary reports the current percentage of heating stages or
modulating heat turned on. If the node is controlling a heat pump,
heat_output_primary reports the current percentage of compressor stages
turned on when the node is in the HVAC_HEAT mode.
nvoUnitStatus
(SNVT_hvac_status)
heat_output_secondary Percentage
0 to 100
0 If the node is controlling a heat pump, heat_output_secondary reports the
current percentage of auxiliary heating stages turned on when the node is
in the HVAC_HEAT or HVAC_EMERG_HEAT mode. If the node is not
controlling a heat pump, heat_output_secondary is set to zero.
nvoUnitStatus
(SNVT_hvac_status)
cool_output Percentage
0 to 100
0 cool_output reports the current percentage of cooling stages or modulating
cool turned on. If the node is controlling a heat pump, cool_output reports
the current percentage of compressor stages turned on when the node is in
the HVAC_COOL mode.
nvoUnitStatus
(SNVT_hvac_status)
econ_output Percentage
0 to 100
0 If there is a modulating economizer configured, econ_output reports the
percentage that the economizer damper is opened. If no economizer is
configured, econ_output reports 0.
nvoUnitStatus
(SNVT_hvac_status)
fan_output Percentage
0 to 100
0 When the fan is running, fan_output is 100 percent, and when the fan is not
running, fan_output is 0 percent.
Table 26. L
ON
M
ARK
®/Open System Points. (Continued)
User Address NvName Field Name
Engineering Units: English
(Metric) or States plus Range
Digital State or
Value of State
Default
E-Vision (M, P, S)
Share
Map
Direct Access
Hardware Config.
Manual Config.
Failure Detect
E-Vision Legend: (M) Monitor, (P) Parameter, (S) Schematic
Comments