Honeywell W7750A specifications Ppm

74-2958— 1

76

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

OaEnthEn

nciAux1SetPt

ubOdEnthalpyEnableS2

btu/lb

25

P

X

X

If Config.EconEnable is SINGLE_ENTH, and calculated outdoor

0 to 65

enthalpy is less than OdEnthalpyEnable, and outdoor temperature is

less than OdEconEnableTemp, then outdoor air is judged suitable to

augment mechanical cooling.

EconMinPos

nciAux1SetPt

ubEconMinPosS0

Percentage

0

P

X

X

The minimum allowed position of the economizer damper for HEAT

0 to 100

and COOL is EconMinPos.

EconIAQPos

nciAux1SetPt

ubEconIaqPosS0

Percentage

80

P

X

X

The control overrides the economizer damper to EconIaqPos when

0 to 100

poor indoor air quality is detected.

IAQSetpt

nciAux1SetPt

siCO2IaqLimitS0

PPM

800

P

X

X

When an analog CO2 sensor is configured and the sensed CO2 is

0 to 2000

greater than CO2IaqLimit, then poor indoor air quality is detected

and Data1.OverRide is set to 1. When the sensed CO2 is less than

CO2IaqLimit, then the indoor air quality is considered acceptable

and Data1.IaqOverRide is set to 0. oData1.IaqOverRide is used to

set the economizer damper to Aux1SetPt. EconIaqPos and to

possibly turn on the heat according to the state of

Config.IaqUseHeat.

PwmPeriod

nciAux1SetPt

siPwmPeriodS4

100

P

X

X

When pulse width modulation is used, the period of one pulse width

modulation cycle is PwmPeriod seconds. The smallest resolution is

0.1 seconds.

PwmZeroScale

nciAux1SetPt

siPwm0pcntS4

Seconds

1

P

X

X

When pulse width modulation is used, the period of a pulse for zero

0 to 2047

percent output (damper or valve at open position) is Pwm0pcntS4

seconds. The smallest resolution is 0.1 seconds.

PwmFullScale

nciAux1SetPt

siPwm100pcntS4

Seconds

99

P

X

X

When pulse width modulation is used, the period of a pulse for full

0 to 2047

scale output (damper or valve at open position) is Pwm100pcnt

seconds. The smallest resolution is 0.1 seconds.

BypTime

nciAux2SetPt

uiBypassTime

minutes

180

P

X

X

uiBypassTime is the time between the pressing of the override

0 to 1080

button at the wall module (or initiating OC_BYPASS via ManOcc)

and the return to the original occupancy state. When the bypass

state has been activated, the bypass timer is set to BypassTime.

FltrPressStPt

nciAux2SetPt

ubFilterPressStPtS5

inw (kPa)

0.5

P

X

X

If a filter pressure sensor is configured by IoSelect and the filter

0 to 5 (0 to 1.25)

pressure reported in Data1 FilterPressure exceeds FilterPressStPt,

then a DIRTY_FILTER alarm is generated and Data1.DirtyFilter is

set to 1.

StptKnobLowLim

nciAux2SetPt

siLowStPtS7

Degrees F

55

P

X

X

LowStPt is the lowest value reported for the setpoint knob.

-9 to 90

Dependent on the configuration of the setpoint knob (see

Degrees C

Config.SetPntKnob) this setting is either absolute [degree

(-23 to 32)

Fahrenheit (50 to 90)] in case of absolute setpoint knob configuration

or relative [delta degree Fahrenheit (-9 to +9)] in case of relative

setpoint knob configuration.

StptKnobHiLim

nciAux2SetPt

siHighStPtS7

Degrees F

85

P

X

X

HighStPt is the highest value reported for the setpoint knob.

-9 to 90

Dependent on the configuration of the setpoint knob (see

Degrees C

Config.SetPntKnob) this setting is either absolute [degree

(-23 to 32)

Fahrenheit (50 to 90)] in case of absolute setpoint knob configuration

or relative [delta degree Fahrenheit (-9 to +9)] in case of relative

setpoint knob configuration.

EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER