Honeywell THX9321, THX9421 EIM

System Installation Guide

12

69-2490 —03

EIM wiring guide — geothermal radiant heat

Typicalwiringforgeothermalradiantheat,geothermalforced-air,andbackup

heatwithonetransformer.

1

2

3

U1, U2 or U3 terminals must be used for geothermal radiant heat (ISU 2010). Thermostat allows 2 stages of radiant heat—

geothermal (stage 1) and boiler (stage 2).

“U” terminals are normally open dry contacts when set up for geothermal radiant heat. You must install a field jumper if radiant

heat is powered by system transformer. Do NOT install a field jumper if radiant heat has its own transformer.

L/A terminal sends continuous output when thermostat is set to EM HEAT mode except when set up for Economizer or TOD.

See Economizer wiring section.

O/B

AUX1

AUX2

O/B

R

C

AUX1

AUX2

G

L

Y2

Y

L/A

CHANGEOVER VALVE

BACKUP HEAT

STAGE 1

FAN RELAY

120

VAC

24

VAC

COMPRESSOR

STAGE 1

COMPRESSOR

STAGE 2

BACKUP HEAT

STAGE 2

COMPRESSOR MONITOR

OR ZONE PANEL

GEOTHERMAL RADIANT

HEAT STAGE 1

3

3

2

1

SENSORS

AIR HANDLER

TRANSFORMER

STATUS

LEDS

JUMPERS

OPTIONAL

JUMPER

POWER

HEAT

COOL

FAN

U1

U2

U3

TO THERMOSTAT

HEAT PUMP

EIM

2

CONNECT OPTIONAL

SENSORS TO

S1 AND S2 TERMINALS

(MAX. 2 SENSORS)

MCR32947

69-2490_B.indd 12 7/13/2011 1:41:55 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?