Honeywell THX9421 Manual

A SERVICE OF

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THX9321/9421 Prestige

®

IAQ and RF EIM

3

69-2490—03

MCR29241

MCR32386

Install thermostat

1

• THX9421:MountthethermostatandwiretoCandRterminalsofthe

EquipmentInterfaceModule(EIM),ortoaseparate24volttransformer(not

provided).

• THX9321:InstallandwireasaboveifusingEIM.Ifnot,seepages13-15.

Seepages10-17fordetailedwiringguidelines

MCR32387

MCR32389

R

C

Y

Y2

G

L

W

O/B

W2

AUX1

W3

AUX2

Strip 1/4” insulation, then insert wires as shown.

Install Equipment Interface Module (if used)

2

[If no EIM is used, skip to Section 3.]

Usescrews&anchorsasappropriateforthemountingsurface.MounttheEIM

neartheHVACequipment,orontheequipmentitself.

MCR32388

NOTE: If you install more than one thermostat and

EIM, the EIMs must be at least 2 feet apart.

If installing a discharge/return air sensor, it must

be located between the IAQ equipment and the

heating/cooling equipment. The sensors must be

in air that is mixed well (away from a-coil/heat

exchanger). See page 7.

When used with the EIM, the relays in the thermostat do not function.

69-2490_B.indd 3 7/13/2011 1:41:48 PM