Injury Or Death - Goodman GMEC96 Service Instructions Manual

SYSTEM OPERATION
Y C
Remote Condensing Unit
(Single-Stage Cooling)
Thermostat - Two-Stage Heating with Single-Stage Cooling
Y2
Y
Y2
Remote Condensing Unit
(Two-Stage Cooling)
Thermostat - Two-Stage Heating with Two-Stage Cooling
Thermostat Wiring Diagrams
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 step-
ping up can be set at either a fixed 10 or 20 minute time
delay or a load based variable time between 1 and 12 min-
utes (AUTO mode). If the AUTO mode is selected, the con-
trol averages the cycle times of the previous three cycles
and uses the average to determine the time to transition
from low stage to high stage.
Staging and Blower Off Delay DIP Switches PCBBF137
DIP Switch DIP Switch
Purpose
Group Number
Heat Staging /
1, 2
Delay
S1
Blower Heat Off
3, 4
Delay
* = Factory Position
Staging and Blower Off Delay Dip Switches
Purpose Switch Group Function
2 Stage Stat
Thermostat 1 Stg Stat 10 min delay
S3
setup
1 Stg Stat 20 min delay
Heating Fan Off
S3
Delay
*Factory Setting
R
Furnace
Integrated
R
Control
Module
W1 W2
Furnace
W1 W2
Integrated
Control
Module
A
HERMOSTAT PPLICATION
Function
Auto 1 OFF*
10 Minutes 1 ON
20 Minutes 1 ON
2 Stage 1 OFF
90 Seconds 3 OFF
120 Seconds 3 OFF
150 Seconds 3 ON*
180 Seconds 3 ON*
PCBBF139
Dip Switch
1 2 3
OFF OFF
ON OFF
ON ON
Auto Off* ON*
90 OFF
120 OFF
150 ON*
180 ON
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 common duct system. Using the twin-
ning function will require 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.
NOTE: Each furnace must be connected to its own 115 VAC
power supply. The L1 connection toeach furnace must be
in phase (connected to circuit breakers on the same 115
VAC service panel phase leg). To verify that the furnaces
are in phase, check from L1 to L1 on each furnace with a
voltmeter. If the furnaces are in phase, the voltage between
both furnaces will be ZERO.
CIRCULATOR BLOWER SPEED ADJUSTMENT
2 ON*
2 OFF
HIGH VOLTAGE
2 ON
2 OFF D ALL
ISCONNECT
4 OFF
M
ULTIPLE POWER SOURCES MAY BE PRESENT.
4 ON
SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
4 OFF*
4 ON
This furnace is equipped with a multi-speed ECM motor.
Two wiring harnesses connect the motor to the integrated
control board and furnace power supply. The line voltage
(115 VAC) power supply to the motor is constant and not
switched by the control board. Motor operation is also de-
4
pendent on a 24 VDC signal on one of the four speed taps
on the motor. The airflow tables for heating and cooling
speeds show the relationship between airflow (CFM) and
external static pressure for each size furnace.
OFF
ON
OFF*
ON
Room
Furnace 1
Thermostat
Ylo
Y2
Y
Y
W W
W2
W2
R R
G G
C
C
WARNING
POWER BEFOR CHANGING SPEED TAPS.
F
AILURE TO DO
Furnace 2
Ylo
Y
W
W2
R
G
C
27