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F :
"4-
WPICAL SYSTEM WIRING TABLE
* The twinning feature is available only on models with six screw terminals; one of these terminals
will be designated'TWIN'.
All50A55-843 controls used in twinning applications must have the
'TWlN" terminal.
t Maximum recommended flame probe wire length is 36 inches.
50A55
TERMINAL
TERMINAL I
TYPE
SYSTEM COMPONENT
CONNECTION
W
G
R
Y
c
TWIN-
Terminal
block with
captive
screws
low voltage thermostat W terminal (or equivalent)
low voltage thermostat G terminal (or equivalent)
low voltage thermostat R terminal (or equivalent)
low voltage thermostat Y terminal (or equivalent)
(2nd wire from Y terminal goes to 24VAC HOT side of
compressor contactor coil)
24 V AC COMMON side of compressor contactor coil
one wire twinning terminal
MV (2 terminals)
TR
TH
RO1
RO2
FP
PS
H L I
HLO
G N D
(unused terminal)
12-pin
connector
& harness
gas valve (both gas solenoids are connected in parallel)
24VAC transformer (low voltage COMMON side)
24VAC transformer (low voltage HIGH side)
rollout switch OUTPUT
rollout switch INPUT
flame sensor probe*
pressure switch INPUT
high limit INPUT
high limit OUTPUT
MUST BE RELIABLY GROUNDED TO CHASSIS
I N D
I G N
I N D N
I G N N
inducer HOT side
ignitor HOT side
inducer NEUTRAL side
ignitor NEUTRAL side
cooL
spade terminal
circulator blower COOL SPEED terminal
HEAT
spade terminal
circulator blower HEAT SPEED terminal
PARK (2 terminals) s pade terminal unused circulator blower terminals
L I N E
spade terminal input voltage (120 VAC) HOT side
XFMR
spade terminal 24VAC transformer line voltage HOT side
EAC (optional)
spade terminal
electronic air cleaner HOT side
HUM (optional)
spade terminal
humidifier HOT side
CIR N
spade terminal circulator blower NEUTRAL terminal
L I N E N
spade terminal
input voltage (120 VAC) NEUTRAL side
XFMR N
spade terminal
24VAC transformer line voltage NEUTRAL side
EAC N (optional)
spade terminal
electronic air cleaner NEUTRAL side
HUM N (optional)
spade terminal
humidifier NEUTRAL side
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