Single -Stage Heating Thermostat; Fossil Fuel Applications; Twinning; 115 Volt Line Connection Ofa - Goodman xMEC96 Series User Manual

S -S H T
INGLE TAGE EATING
A single-stage thermostat with only one heating stage may be
used to control this furnace. The application of a single-stage
thermostat offers a timed transition from low to high fire. The
furnace will run on low stage for a fixed period of time before
stepping up to high stage to satisfy the thermostat's call for
heat. The delay period prior to stepping up can be set at either
a fixed 10 or 20 minute time delay or a load based variable time
between 1 and 12 minutes (AUTO mode). If the AUTO mode is
selected, the control averages the cycle times of the previous
three cycles and uses the average to determine the time to tran-
sition from low stage to high stage.
F F A
OSSIL UEL PPLICATIONS
This furnace can be used in conjunction with a heat pump in a fossil fuel application. A fossil fuel application refers to a combined gas
furnace and heat pump installation which uses an outdoor temperature sensor to determine the most cost efficient means of heating
(heat pump or gas furnace).
A heat pump thermostat with three stages of heat is required to properly use a two-stage furnace in conjunction with a heat pump.
Refer to the fossil fuel kit installation instructions for additional thermostat requirements.
Strictly follow the wiring guidelines in the fossil fuel kit installation instructions. All furnace connections must be made to the furnace
two-stage integrated control module and the "FURNACE"
terminal strip on the fossil fuel control board.
T
WINNING
Using the "TWIN" terminals and proper wiring enables
two *MEC96 furnaces of the same model and size to
be twinned. Twinning allows simultaneous operation
of two furnaces and forces the indoor blower motors
of each furnace to operate synchronously into a com-
mon duct system. Using the twinning function will re-
quire only field installed wiring with no external kits
or parts.
· The staging DIP switches and speed tap DIP
switches must be set the same on both furnaces.
115 V L C
OLT INE ONNECTION OF
E A C
FIER AND LECTRONIC IR
The furnace integrated control module is equipped with line voltage accessory terminals for controlling power to an optional field-
supplied humidifier and/or electronic air cleaner.
The accessory load specifications are noted in the chart at right:
Turn OFF power to the furnace before installing any accessories.
Follow the humidifier or air cleaner manufacturers' instructions for
locating, mounting, grounding, and controlling these accessories.
Accessory wiring connections are to be made through the 1/4" quick
connect terminals provided on the furnace integrated control mod-
ule. The humidifier and electronic air cleaner hot terminals are
identified as HUM and EAC. The humidifier and electronic air cleaner
neutral terminals are identified as NEUTRAL. All field wiring must
conform to applicable codes. Connections should be made as shown.
A
HERMOSTAT PPLICATION
A (H
CCESSORIES UMIDI
)
LEANER
DI P
Switch
Group
S1
* = Fa ctory Pos iti on
-
Humidifier
Electronic Air Cleaner
HIGH VOLTAGE !
T
O AVOID PERSONAL INJURY OR DEATH DUE TO
ELECTRICAL SHOCK
BEFORE SERVICING OR CHANGING ANY ELECTRICAL
.
WIRING
23
DIP
Switch Purpos e
Numbe r
Auto
He at
10 Minute s
1, 2 Sta ging /
20 Minute s
De la y
2 Stage
90 Se conds
Blowe r
120 Seconds
3, 4 He at Off
150 Seconds
Dela y
180 Seconds
Room
Furnace 1
Thermostat
Ylo
Y2
Y
Y
W
W
W2
W2
R R
G G
C C
1.0 Amp maximum at 120 VAC
1.0 Amp maximum at 120 VAC
WARNING
,
DISCONNECT ELECTRICAL POWER
Function
1 OFF* 2 ON*
1 ON 2 OFF
1 ON 2 ON
1 OFF 2 OFF
3 OFF 4 OFF
3 OFF 4 ON
3 ON* 4 OFF*
3 ON* 4 ON
Furnace 2
Ylo
Y
W
W2
R
G
C