Honeywell PRESTIGE THX9421 User Manual download pdf (Page 10)

System Installation Guide

69-2490—03

Typicalwiringofaconventionalsystemwithupto3-stageheatand2-stagecool

withonetransformer.

EIM wiring guide — conventional systems

See following pages for additional thermostat wiring guidlines for heat pumps,

geothermal systems and optional Economizer.

See guides on following pages for thermostat wiring and geothermal radiant heat wiring.

Wire a maximum of 2 sensors using the S1 and S2 terminals. See ISU 5000-6190 for options.

Remove jumper(s) if using separate transformers.

See Economizer wiring section.

HEAT STAGE 1

HEAT STAGE 2

HEAT STAGE 3

FAN

TO THERMOSTAT

STATUS

LEDS

JUMPERS

SENSORS

CONV

FURNACE

TRANSFORMER

120

VAC

COMPRESSOR

STAGE 1

COMPRESSOR

STAGE 2

POWER

HEAT

COOL

FAN

CONNECT OPTIONAL

SENSORS TO

S1 AND S2 TERMINALS

(MAX. 2 SENSORS)

EIM

MCR32945

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Honeywell PRESTIGE THX9421 User Manual Page 10