Honeywell PRESTIGE THX9321 - Commercial Dehumidification Menu; Commercial Dehumidification Methods Explained; Reviewing Dehumidifier Timer Settings

THX9321/9421 Prestige
®
IAQ and RF EIM
21
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.
69-2490_B.indd 21 7/13/2011 1:42:01 PM