27
INSTALLATION CONSIDERATIONS
115 VOLT LINE CONNECTION OF ACCESSORIES
(ELECTRONIC AIR CLEANER)
WARNING
HIGH
VOLTAGE
D
ISCONNECT
ALL
POWER BEFORE SERVICING OR
CHANGING ANY ELECTRICAL WIRING.
M
ULTIPLE POWER
SOURCES MAY BE PRESENT.
F
AILURE TO DO SO MAY CAUSE
PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
Electronic
Air Cleaner
1.0 Am p m aximum at 120 VAC
Humidifier
1.0 Am p m aximum at 120 VAC
ACCESSORY LOAD SPECIFICATIONS
Turn OFF power to the furnace before installing any acces-
sories. Follow the humidifier or air cleaner manufacturers’
instructions for locating, mounting, grounding, and control-
ling these accessories.
If it is necessary for the installer to supply additional line
voltage wiring to the inside of the furnace, the wiring must
conform to all local codes, and have a minimum tempera-
ture rating of 105°C. All line voltage wire splices must be
made inside the furnace junction box.
The integrated control module electronic air cleaner termi-
nals (EAC) are energized with 115 volts whenever the circu-
lator blower is energized.
24 V
OLT
T
HERMOSTAT
W
IRING
NOTE:
Low voltage connections can be made through ei-
ther the right or left side panel. Wire routing must not inter-
fere with circulator blower operation, filter removal, or routine
maintenance.
A 40 V.A. transformer and an integrated electronic control
are built into the furnace to allow use with most cooling equip-
ment. Consult the wiring diagram, located in the Installation
Manual or this document or on the blower door for further
details of 115 Volt and 24 Volt wiring.
T
HERMOSTAT
W
IRING
The DM96VE furnace has W1 & W2 terminals for connec-
tion of a two stage heating thermostat. If desired, a thermo-
stat with only one stage of heat may be used. As shipped,
the furnace S1-1 switch is OFF; S1-2 switch is ON. This is
the correct position to use a single stage heating thermo-
stat with auto timing transition to high fire.
R
Y
C
Furnace
Integrated
Control
Module
Remote Condensing Unit
(Single-Stage Cooling)
R
Thermostat - Single -Stage Heating with Single-Stage Cooling
NOTE:
To apply a single-stage Heating Thermostat, the thermostat
selector switch on the Integrated Control Module
must
be set on
single-stage.
R
Y
C
Furnace
Integrated
Control
Module
Remote Condensing Unit
(Single-Stage Cooling)
R
Thermostat - Two-Stage Heating with Single-Stage Cooling
W1
W2
Y
Furnace
Integrated
Control
Module
Remote Condensing Unit
(Two-Stage Cooling)
Y2
W1
W2
Y2
Thermostat - Two-Stage Heating with Two-Stage Cooling
Thermostat Wiring Diagrams
S
INGLE
-S
TAGE
H
EATING
T
HERMOSTAT
A
PPLICATION
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 transition from low stage to
high stage.
1
2
2 Stage Stat
OFF
OFF
1 Stg Stat 10 min delay
ON
OFF
1 Stg Stat 20 min delay
ON
ON
Auto Off*
ON*
1
2
2 Stage Stat
OFF
OFF
1 Stg Stat 10 min delay
ON
OFF
1 Stg Stat 20 min delay
ON
ON
Auto Off*
ON*
*Factory Setting
Thermostat
setup
S3
Dip Switch
Thermostat Staging Setup PCBBF139
Purpose
Switch Group
Function
Thermostat
setup
S1
Dip Switch
Thermostat Staging Setup PCBBF137
Purpose
Switch Group
Function
