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Honeywell THX9321, THX9421 Heat pump with outdoor temperature lockouts, Heat pump and backup heat operation

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THX9321/9421 P restige® IAQ and RF EIM

19 69-2490 —03

Heat pump with outdoor temperature lockoutsHeat pump and backup heat operation

Outdoortemperaturelockoutsareoptional.SeeInstallerSetup

options(ISU3120).

Heat pump only

Heat pump with backup heat as needed *

Backup heat only

Heat pump only

Heat pump or backup heat operates *

Backup heat only

Outdoor temperatureOutdoor temperature

Backup heat lockout

Backup heat lockout

Compressor lockout

Compressor lockout

* No backup heat unless indoor temperature drops to selected Backup Heat Differential setting, or Backup Heat

Upstage Timer expires. Heat pump stays ON when backup heat turns on.

* No backup heat unless indoor temperature drops to selected Backup Heat Differential setting, or Backup

Heat Upstage Timer expires. Heat pump turns OFF when backup heat turns on.

Backup heat allowed to run with heat pump (see table below)

Backup heat NOT allowed to run with heat pump (see table below)

Electric forced air Allowed to run with heat pump Thermostat controls fan

Gas or oil forced air NOT allowed to run with heat pump Equipment controls fan

Hot water radiant heat Allowed to run with heat pump [n/a]

Hot water fan coil Selectable in installer setup Thermostat controls fan

Other Selectable in installer setup Selectable in installer setup

Backup Heat Type Backup Heat Operation Backup Heat Fan Operation

69-2490_B.indd 19 7/13/2011 1:42:00 PM

Contents

Main THX9321/9421 Prestige IAQ and RF EIM With wireless accessories System Installation Guide Installation guide for: Quick start guide Your Honeywell advantage Install thermostat Install Equipment Interface Module (if used ) Power optional accessories 3 RedLINK Internet Gateway Link thermostat to the wireless network (ifusedwithanEIMor TrueZONEWirelessAdapter) 4 Next,linkallcomponentsandRedLINKaccessoriestothewirelessnetwork. Initial powerup configuration Setup options for THX9421 Link optional accessories to wireless network Portable Comfort Control Wireless outdoor sensor Wireless indoor sensor RedLINK Internet Gateway Install optional sensors 6 To install outdoor air sensor To install indoor air sensor To install discharge/return air sensor Setup Installer options (ISU ) THX9321/9421 P restige IAQ and RF EIM 9 Installer options (ISU) EIM wiring guide conventional systems EIM EIM wiring guide heat pump systems L/A EIM EIM wiring guide geothermal radiant heat L/A EIM Thermostat wiring guides Prestige THX9321 Typicalwiringofa2-heat/2-coolcon- ventionalsystemwithonetransformer 69-2490_B.indd 13 7/13/2011 1:41:56 PM 6 Typicalwiringofa3-heat/2-coolheat pumpsystemwithonetransformer Prestige THX9321 or EIM: Using universal relays to control heating or cooling Poweringuniversalrelaywithseparate heatingtransformer(THX9321shown) 69-2490_B.indd 14 7/13/2011 1:41:57 PM Poweringuniversalrelaywithsystem transformer(THX9321shown) 15 Wiring guide IAQ equipment (EIM or thermostat ) 69-2490_B.indd 15 7/13/2011 1:41:59 PM = NORMALLY CLOSED, DRY CONTACTS = NORMALLY OPEN, DRY CONTACTS "U"terminalscanbeusedforhumidification,dehumidificationorventilation. Economizer Module wiring guides Economizer Module wiring guides Economizer and TOD operation (ISU 2220 ) Commercial use only Heat pump with outdoor temperature lockouts Heat pump and backup heat operation Outdoortemperaturelockoutsareoptional.SeeInstallerSetup options(ISU3120). Backup heat differential and upstage timer Basic and Advanced Temperature Control Options (ISU 3010) Humidification Residential dehumidification Commercial dehumidification Southern Dehumidification Away Mode Ventilation Indoor sensor operation Wireless indoor sensor Alerts and diagnostics Replacing system components To replace an Equipment Interface Module (EIM) or thermostat To remove accessories from an EIM or thermostat Specifications & replacement parts Regulatory information Need Help?