Honeywell W7750A DisMinHtTime NciConfig DisableHeatMinTime, CascCntrl NciConfig CascadeControl

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96

Table 25. Configuration Parameters. (Continued)

Value

Digital

E-Vision

Direct

Hardware

Manual

NOTE: Physical I/O points that are configurable are in Table 20.

E-Vision Legend: (M) Monitor, (P) Parameter, (S) Schematic

User Address

NvName

Field Name

(Metric) or States plus Range

ofState

Stateor

Default

(M, P,S)

Share

Map

Access

Config.

Config.

Test

Comments

Engineering Units: English

DisMinHtTime

nciConfig

DisableHeatMinTime

FALSE

0

FALSE

P

X

X

If DisableHeatMinTime is 0 (FALSE), the heating stages are on or off for a

TRUE

1

minimum time determined by ubHeatCph (Refer to Table 17 Interstage

Minimum Times of the System Engineering Guide). If DisableHeatMinTime

is 1 (TRUE), the heating stages are on or off for a 30 second minimum

time.

DisMinClTime

nciConfig

DisableCoolMinTime

FALSE

0

FALSE

P

X

X

If DisableCoolMinTime is 0 (FALSE), the cooling stages are on or off for a

TRUE

1

minimum time determined by CoolCph (Refer to Table 17 Interstage

Minimum Times of the System Engineering Guide). If DisableCoolMinTime

is 1 (TRUE), the cooling stages are on or off for a 30 second minimum

time.

CascCntrl

nciConfig

CascadeControl

FALSE

0

FALSE

P

X

X

When CascadeControl is 0 (FALSE), then the discharge air temperature is

TRUE

1

not directly controlled and heating and cooling equipment are modulated to

maintain space temperature. When CascadeControl is 1 (TRUE), then the

discharge air temperature is controlled by an additional control loop based

on the error signal from the space temperature control loop. Cascade

Control is applicable to modulating heating/cooling only (not staged).

UseRaTempCtl

nciConfig

ControlUsesRtnAirTemp

FALSE

0

FALSE

P

X

X

If ControlUsesRtnAirTemp is a 0 (FALSE), then Data2.SpaceTemp is set

TRUE

1

equal either the space temperature sensor (IO.siSpaceTemp) or

SpaceTemp depending on the value of SpaceTemp. When

ControlUsesRtnAirTemp is 1 (TRUE) and SpaceTemp is SI_INVALID, then

Data2.SpaceTemp is set equal to return air sensor (IO.ReturnTemp) and

the control uses the return air sensor to control heating or cooling. When

ControlUsesRtnAirTemp is 1 (TRUE) and SpaceTemp is not SI_INVALID,

then Data2.siSpaceTemp is set equal to SpaceTemp and the control uses

SpaceTemp to control heating or cooling.

IaqUseHeat

nciConfig

IaqUseHeat

FALSE

0

FALSE

P

X

X

When the effective occupancy is OC_OCCUPIED and IaqUseHeat is 0

TRUE

1

(FALSE), then no heating stages or modulating heating are turned when

the discharge air temperature goes below the low limit. Energy has priority

over ventilation. When the effective occupancy is OC_OCCUPIED and

IaqUseHeat is 1 (TRUE), then the heating stages or modulating heating

are turned on to prevent the discharge air temperature from going below

the discharge air temperature low limit. Ventilation has priority over energy

cost.

EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER