J962V Installation Manual

21
Two-Stage AC & Two-Stage Thermostat
This option uses the full two stage heating capability of
the furnace with a two stage outdoor unit. See Figure 19.
• Connect the thermostat’s W1 & W2 outputs to the
furnace control board’s W1 & W2 terminals.
• Always connect the thermostat C & R to the furnace
control board C & R.
• For cooling, connect the thermostat Y & Y1 to the furnace
control board’s Y / Y2 & Y1 terminal’s.
• Field supplied wires should also connect the Y / Y2 &
Y1 signals to the outdoor unit’s Y & Y1 terminals.
• Connect terminal C to the outdoor unit’s C.
Autostaging for Single Stage Thermostats
The Autostaging feature makes it possible to use a single
stage thermostat and still receive some of the benefits
of 2-stage furnace operation. If Autostage is enabled,
the furnace will drop to LOW fire after initially starting in
HIGH fire. After a period of 10 minutes, the furnace will
Grounding
WARNING:
To minimize personal injury, the furnace cabinet
must have an uninterrupted or unbroken electrical
ground. The controls used in this furnace require
an earth ground to operate properly. Acceptable
methods include electrical wire or conduit
approved for ground service. Do not use gas
piping as an electrical ground!
Thermostat / Low Voltage Connections
• The furnace is designed to be controlled by a 24 VAC
thermostat. The thermostat’s wiring must comply with
the current provisions of the NEC (ANSI/NFPA 70) and
with applicable local codes having jurisdiction.
• Twinning of two stage furnaces is no longer supported.
Please contact your furnace distributor for details.
• The thermostat must be installed according to the
instructions supplied by the thermostat manufacturer.
Low voltage connections (24 VAC) from the thermostat
are wired to the terminal strip on the integrated control
in the furnace. Recommended minimum wire gauge for
thermostat wiring is shown in Table 5 (page 20).
• The thermostat should be mounted about 5 feet above
the floor on an inside wall. DO NOT install the thermostat
on an outside wall or any other location where its
operation may be adversely affected by radiant heat from
fireplaces, sunlight, or lighting fixtures, and convective
heat from warm air registers or electrical appliances.
Refer to the thermostat manufacturer’s instruction sheet
for detailed mounting information.
• Depending on the type of air conditioning unit and
thermostat used, both blower applications utilize three
basic wiring configurations.
Single Stage AC & Single Stage Thermostat
This option does not use the full two-stage control
capability of the furnace, but the possibility of timed
autostaging is available. See also Autostaging for Single
Stage Thermostats.
• Connect the thermostat’s W output to the furnace control
boards W1 terminal. This allows the furnace to always
run in low output mode. See Figure 17.
• Always connect the thermostat C & R to the furnace
control board C & R.
• For cooling, connect the thermostats Y signal to the
furnace control board Y / Y2 terminal.
• Field supplied wires should also connect Y / Y2 & C to
the outdoor unit’s Y & C terminals.
Single Stage AC & Two Stage Thermostat
This option uses the full two stage heating capability of
the furnace with a single stage outdoor unit. See Figure 18.
• Connect the thermostat’s W1 & W2 outputs to the
furnace control board’s W1 & W2 terminals.
• Always connect the thermostat C & R to the furnace
control board C & R
• For cooling, connect the thermostats Y signal to the
furnace control board Y / Y2 terminal.
• Field supplied wires should also connect Y / Y2 & C to
the outdoor unit’s Y & C terminals.
Figure 17. Wiring Configuration 1
R DHUM
C
Y
G
W
1
ROOM THERMOSTAT
(SINGLE STAGE)
DHUM
A/C CONDENSING UNIT
(SINGLE STAGE)
C
R
C
Y/Y2
Y
W2
G
W1
Y1
HIGH EFFICIENCY
BLOWER MOTOR
CONTROL BOARD
TWO STAGE FURNACE BOARD
Figure 18. Wiring Configuration 2
DHUM
A/C CONDENSING UNIT
(SINGLE STAGE)
HIGH EFFICIENCY
BLOWER MOTOR
CONTROL BOARD
C
Y
R DHUMC
Y
G
ROOM THERMOSTAT
(TWO - STAGE)
W
1
W
2
TWO STAGE FURNACE BOARD
R
C
Y/Y2
W2
G
W1
Y1
A/C CONDENSING UNIT
(TWO STAGE)
HIGH EFFICIENCY
BLOWER MOTOR
CONTROL BO
ARD
DHUM
C
Y2
Y1
R DHUMC
Y
2
G
ROOM THERMOSTAT
(TWO STAGE)
W
1
W
2
TWO STAGE FURNACE BOARD
Y
1
R
C
Y/Y2
W2
G
W1
Y1
Figure 19. Wiring Configuration 3