Thermostat; Single Stage Ac & Two - Stage Heat Thermostat; Two - Stage Ac & Two - Stage Heat Thermostat; Autostaging For Single Stage Thermostats - Maytag *TC Installation Instructions Manual

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 25).
• The thermostat should be mounted about 5 feet
above the fl oor 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 fi replaces, sunlight, or lighting fi xtures, 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 confi gurations
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 24)
• 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 24. Wiring Confi guration 1
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 22.
• 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.
26
A/C CONDENSING UNIT
(SINGLE STAGE)
Figure 25. Wiring Confi guration 2
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 26.
• 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.
A/C CONDENSING UNIT
Figure 26. Wiring Confi guration 3

Autostaging for Single Stage Thermostats

The Autostaging feature included on all G7 2-stage
furnaces makes it possible to use a single stage thermostat
and still receive some of the benefi ts of 2-stage furnace
operation. If Autostage is enabled, the furnace will drop to
LOW fi re after initially starting in HIGH fi re. After a period
of time (8 or 12 minutes) the furnace will then stage up
to HIGH fi re, until the heating load is met. See Figure 24
and the Low Voltage Wiring section (page 25).
Autostaging options are selected using the autostage
jumper located near the thermostat terminal block. See
Figure 32 ( page 40). When the autostage jumper is moved
from NONE to SHORT or LONG, the following occurs
during a call for heat:
Y
HIGH EFFICIENCY
C BLOWER MOTOR
CONTROL BOARD
Y2
HIGH EFFICIENCY
Y1
C BLOWER MOTOR
CONTROL BOARD
(TWO STAGE)