PPiinn 11
to Inducer High Speed Output.
PPiinn 22
to
Inducer Low Speed Output
PPiinn 33
is
not used.
PPiinn 44
to
Neutral.
NEUTRAL TERMINALS
These terminals connect 115VAC neu-
tral to the furnace control from the input
at the junction box of the furnace.
Additionally, spare terminals are provid-
ed for use with electronic air cleaners,
humidifiers and other accessories as
needed (Check the voltage rating of
your equipment.)
ELECTRONIC AIR CLEANER
(E.A.C.) OUTPUT (J8)
This output is used to energize an elec-
tronic air cleaner. The output will pro-
vide 1.0 amp at 115 VAC. This output is
energized any time the blower motor is
above 40% of maximum airflow capaci-
ty. Airflow below this value is not con-
sidered to be enough for a typical elec-
tronic air cleaner to perform properly.
For 1/2HP motors – Electronic air clean-
er is energized any time the blower is
above 480 CFM (1200 CFM x 0.4)
For 1 HP motors - Electronic air cleaner
is energized any time the blower is
above 800 CFM (2000 CFM x 0.4)
HUMIDIFIER OUTPUT (J8)
These outputs (two) are connected to
the contacts of a control-mounted relay.
In this sense, they are what are called
“dry” contacts. That is, they provide no
voltage, they are only used to close a
circuit. The contacts can be used to
close either a 24VAC or 115VAC circuit
either with a maximum of 1 amp cur-
rent. Details about the humidifier out-
puts and wiring diagrams can be found
in the section titled
HUMIDIFICATION
AND DEHUMIDIFICATION
of this doc-
ument.
15-PIN MATE-N-LOK CONNEC-
TOR (J1) (see Fig 28)
The 15-pin Mate-n-Lok style connector
provides connections for a variety of
inputs and outputs to the furnace con-
trol. For modulating furnaces with a
solenoid-controlled modulating gas
valve (HG or HH Fuel Codes) the 15-
pin connector provides power and con-
trol signals to the gas valve. Also, the
flame sense, pressure switches sense
and limits sense (Main Limit, MRLC
and HALC) are connected to the I.F.C.
through this connector. Reference the
wiring diagram for the furnace printed
in this document or on the inside of the
furnace blower door for pin assign-
ments for troubleshooting.
For troubleshooting purposes, follow
the wiring diagram and troubleshoot-
ing flowchart supplied in this manual
and on the inside of the furnace
blower door. Additionally, the pin
designations for the connector are
specified below:
PPiinn 11
to F
lame Sense rod.
PPiinn 22
to
Overtemp Limit (MRLC)
Sense
PPiinn 33
to
Main Limit (LC) Sense
PPiinn 44
to
24 VAC to Limit Sense
Circuits
PPiinn 55
24
VAC out to Auxiliary Limit
(HALC- Heat
Assisted Limit
Control)
PPiinn 66
1st stage gas valve solenoid
valve main
solenoid 24VAC.
PPiinn 77
2nd stage gas valve solenoid
PPiinn 88
to
Low Pressure Switch
sense.
PPiinn 99
to
High Pressure Switch
sense.
PPiinn 11
00
to Low and High Pressure
Switch 2
4VAC
PPiinn 1111
to Aux Input sense
PPiinn 11
22
to Ground on furnace cabi-
net
PPiinn 11
33
not used on this control
PPiinn 11
44
not used on this control
PPiinn 11
55
gas valve 24VAC common
35
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