Pump Systems - Honeywell Prestige THX9321 System Installation Manual

THX9821/942f Prestige
_ IAQ and RF ElM
ElM wiring guide -- heat pump systems
Typical wiring of a heat pump system with up to four-stage heat and two-stage
cool with one transformer.
STATUS --
LEDS
CHANGEOVER VALVEj'=
_=._=U j _EAT
| ! STAGE 1
BACKUP HEAT
[ STAGE 2
I Y [COMPRESSOR1
3 I
_ -JUMPERS
" _ AIR HANDLER
TRANSFORMER
-_ CONNECT OPTIONAl_
| SENSORS TO
$1 AND $2 TERMINALS
___MAX, 2 SENSORS}
,_ _46
,_ See guideson following pages for thermostatwiring and geothermal radiant heatwiring.
A Wire a maximumof 2 sensorsusing the $1 and $2 terminals. See ISU 5000-6190for options.
A L/A terminal sends continuousoutputwhen thermostat is set to EM HEAT mode,exceptwhen set upfor Economizer
or TOD. See Economizerwiring section.
11 69-2490--03