Honeywell prestige thx9421 Manuale Utente

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

See following pages for additional thermostat wiring guidlines for heat pumps,  
geothermal systems and optional Economizer.

1

2

3

4

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

R
C

W

W2
W3

G

Y2

Y

TRANSFORMER

120

VAC

24

VAC

COMPRESSOR

STAGE 1

COMPRESSOR

STAGE 2

POWER

HEAT

COOL

FAN

U1
U2
U3

A

CONNECT OPTIONAL

SENSORS TO

S1 AND S2 TERMINALS

(MAX. 2 SENSORS)

1

3

2

4

MCR32945

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7/13/2011   1:41:54 PM