Honeywell W7750A specifications Control Parameters

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74

Table 21. Control Parameters. (Continued)

Value

Digital

E-Vision

Direct

Hardware

Manual

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

MaxHtRamp

nciAux1SetPt

ubMaxHtRampS0

Degrees F/Hr

8

P

X

X

MaxHtRamp is the maximum heat recovery ramp rate in degrees F

0 to 20

per hour. This value is used to control the adaptive recovery ramp

Degrees C/Hr

rate during the HEAT recovery period. The setpoint is changed at a

(0 to 11)

rate in degrees F per hour depending on the outdoor air temperature

and the MinHtRamp, OdTempMaxHtRamp, and OaTempMinHtRamp

parameters. If there is no outdoor air temperature sensor available,

then ubMinHtRamp is used as the recovery rate.NOTE: Recovery

ramping applies between scheduled heating or cooling setpoint

changes from OC_UNOCCUPIED to OC_STANDBY,

OC_UNOCCUPIED to OC_OCCUPIED, and OC_STANDBY to

OC_OCCUPIED. Scheduled setpoint changes from OC_OCCUPIED

to OC_UNOCCUPIED or OC_OCCUPIED to OC_STANDBY do not

use a ramped setpoint but instead use a step change in setpoint.

Recovery ramps begin before the next scheduled occupancy time

and are ramped from the setpoint for the existing scheduled

occupancy state to the setpoint for the next occupancy state.

MinHtRamp

nciAux1SetPt

ubMinHtRampS0

Degrees F/Hr

3

P

X

X

MinHtRamp is the minimum heat recovery ramp rate in degrees F

0 to 20

per hour. This value is used to control the adaptive recovery ramp

Degrees C/Hr

rate during the HEAT recovery period. The setpoint is changed at a

(0 to 11)

rate in degrees F per hour depending on the outdoor air temperature

and the MaxHtRamp, OdTempMaxHtRamp, and

OdTempMinHtRamp parameters. If there is no outdoor air

temperature sensor available, then MinHtRamp is used as the

recovery rate. Refer to the NOTE in the comments column for

MaxHtRamp for the conditions that recovery ramping applies to.

OaTempMaxHtRp

nciAux1SetPt

ubOdTempMaxHtRampS0

Degrees F

40

P

X

X

OdTempMaxHtRamp is the maximum outdoor air temperature

0 to 100

parameter that is used to calculate the heat recovery ramp rate

Degrees C

setpoint. This value is used to control the adaptive recovery ramp

(-18 to 38)

rate during the HEAT recovery period. The setpoint is changed at a

rate in degrees F per hour depending on the outdoor air temperature

and the MaxHtRamp, MinHtRamp, and OdTempMinHtRamp

parameters. If there is no outdoor air temperature sensor available,

then MinHtRamp is used as the recovery rate. Refer to the NOTE in

the comments column for MaxHtRamp for what conditions that

recovery ramping applies to.

OaTempMinHtRp

nciAux1SetPt

ubOdTempMinHtRampS0

Degrees F

0

P

X

X

OdTempMinHtRamp is the minimum outdoor air temperature

0 to 100

parameter that is used to calculate the heat recovery ramp rate

Degrees C

setpoint. This value is used to control the adaptive recovery ramp

(-18 to 38)

rate during the HEAT recovery period. The setpoint is changed at a

rate in degrees F per hour depending on the outdoor air temperature

and the MaxHtRamp, MinHtRamp, and OdTempMaxHtRamp

parameters. If there is no outdoor air temperature sensor available,

then MinHtRamp is used as the recovery rate. Refer to the NOTE in

the comments column for MaxHtRamp for what conditions that

recovery ramping applies to.

OaTempClLkOut

nciAux1SetPt

ubOdClLockOutTempS0

Degrees F

Degrees C

50

P

X

X

When the outdoor air temperature is less than OdClLockOutTemp,

0 to 90

(-18 to 32)

the cooling is disabled.

EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER