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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

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Prestige thx9421

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