Honeywell PRESTIGE THX9421 User Manual download pdf (Page 21)

THX9321/9421 Prestige

IAQ and RF EIM

69-2490—03

Humidification

Thethermostatcanbesettocontrolhumidificationinallmodes(Heat,Off,Cool

[ISU8060]).Adischargeairsensorisrequiredtohumidifyinthecoolmode.If

bothhumidificationanddehumidificationaresetuptobecontrolledinthesame

mode(Heat,Off,Cool),thethermostatmaintainsa15%deadbandbetween

humidificationanddehumidificationsetpoints.Thethermostatautomatically

switchesbetweenhumidificationanddehumidificationtomaintainthedesired

humidity level.

HumidificationControlOptions:(ISU8070)

• HumidifyOnlyWhenHeatisOn

• HumidifyOnlyWhenFanisOn

• HumidifyonDemand:ThermostatControlsFan

• HumidifyonDemand:HumidifierControlsFan

Residential dehumidification

DehumidificationEquipmentOptions:(ISU9000)

• A/CwithLowSpeedFan

• A/CwithHighSpeedFan

• WholeHouseDehumidifier

WhensetforA/C with Low Speed Fan or A/C with High Speed Fan,anovercool-

inglimitcanbesetfrom0°to3°F(ISU9070).Thethermostatusesthecooling

systemtoreducehumiditybyloweringthetemperatureupto3°Fbelowthe

currentcoolsetpointuntilthethedesiredhumiditylevelisreached.Ifsetfor

A/C with Low Speed Fan,configureU1,U2orU3asnormallyopenornormally

closed(ISU9050)andwiretheterminaltotheLowSpeedFanterminalonthe

equipment.Duringacallfordehumidification,thethermostatopensorclosesthe

universalrelay(U1,U2orU3)tolowerthefanspeed.

Note:Thethermostatwillnotlowerthefanspeedwhenthesecondstageof

coolingison.

TheWhole House Dehumidifieroptionrequiresadedicatedunitfordehumidifica-

tion.Thethermostatcanbesettocontroldehumidificationinallmodes(Heat,

Off,Cool[ISU9120]).

Ifbothhumidificationanddehumidificationaresettobecontrolledinthesame

mode(Heat,Off,Cool),thethermostatmaintainsa15%deadbandbetween

humidificationanddehumidificationsetpoints.Thethermostatautomatically

switchesbetweenhumidificationanddehumidificationtomaintainthedesired

humidity level.

To see all humidification options, press Menu > Installer Options > View/Edit Current Setup > Humidification.

To see all dehumidification options, press MENU > INSTALLER OPTIONS > VIEW/EDIT CURRENT SETUP >

DEHUMIDIFICATION.

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