Operating instructions
81
The heating and cooling thermostat has two switches on
the base. They are HEAT-OFF-COOL on the left side, and
FAN-AUTO-ON on the right. This thermostat will operate
an air conditioner and a furnace.
Verify that the wiring to the thermostat is correct.
A three-connector cable 19 to 22 AWG is to be used for low
voltage connections. Low voltage wires in the control
compartment are marked "
RR
RR
R", "
GG
GG
G" and "
YY
YY
Y". Route low
voltage cable from thermostat to unit electrical box. Use .50
dia. snap-bushing for routing cable into electrical box.
Connect
RCRC
RCRC
RC from thermostat to red wire in control compart-
ment. Connect
G G
G G
G or
F F
F F
F from thermostat to blue wire in control
box. Connect
YY
YY
Y from thermostat to yellow wire in control
box. Use wire nuts to ensure good connections.
When connecting a gas furnace to this thermostat, the
RHRH
RHRH
RH
and
WW
WW
W terminals are used.
To check the thermostat remove all wires. Next, using an
ohm meter, put the HEAT-OFF-COOL switch in the COOL
position. With room temperature above the setpoint tem-
perature and FAN switch in AUTO position, continuity
should exist between
RCRC
RCRC
RC to
YY
YY
Y and
RCRC
RCRC
RC to
GG
GG
G. With room
temperature below set point temperatures, no continuity
should exist between
RCRC
RCRC
RC to
YY
YY
Y and
RCRC
RCRC
RC to
GG
GG
G. With FAN
switch to ON position, continuity should exist between
RCRC
RCRC
RC
to
G G
G G
G regardless of room temperature.
With HEAT-OFF-COOL switch in the OFF position and
FAN switch in the AUTO position, no continuity should exist
between
RCRC
RCRC
RC to
YY
YY
Y and
RCRC
RCRC
RC to
GG
GG
G regardless of room tempera-
ture. With FAN switch to ON position, continuity should
exist between
RCRC
RCRC
RC to
GG
GG
G and no continuity between
RCRC
RCRC
RC to
YY
YY
Y
regardless of room temperature.
With HEAT-OFF-COOL switch to HEAT and FAN switch to
AUTO position, no continuity should exist between
RC RC
RC RC
RC to
YY
YY
Y
and
RCRC
RCRC
RC to
GG
GG
G regardless of room temperature. With FAN
switch to ON position, continuity should exist between
RCRC
RCRC
RC
to
GG
GG
G and no continuity between
RCRC
RCRC
RC to
YY
YY
Y regardless of room
temperature. With room temperature below setpoint tem-
perature, continuity should exist between
RH RH
RH RH
RH to
WW
WW
W. With
room temperature above setpoint temperature no continu-
ity should exist between
RHRH
RHRH
RH to
WW
WW
W.
HEATING AND COOLING THERMOSTATHEATING AND COOLING THERMOSTAT
HEATING AND COOLING THERMOSTATHEATING AND COOLING THERMOSTAT
HEATING AND COOLING THERMOSTAT
(FRONT)(FRONT)
(FRONT)(FRONT)
(FRONT)
To check ACTIVE terminals, place one lead from ohm
meter to
RCRC
RCRC
RC (cooling) or
RHRH
RHRH
RH (heating) terminal and the
other lead to the ACTIVE (ON) terminal.
HEATING AND COOLING THERMOSTATHEATING AND COOLING THERMOSTAT
HEATING AND COOLING THERMOSTATHEATING AND COOLING THERMOSTAT
HEATING AND COOLING THERMOSTAT
(BACK)(BACK)
(BACK)(BACK)
(BACK)
SWITCHSWITCH
SWITCHSWITCH
SWITCH
COMBINATIONCOMBINATION
COMBINATIONCOMBINATION
COMBINATION
IF ROOM TEMP.IF ROOM TEMP.
IF ROOM TEMP.IF ROOM TEMP.
IF ROOM TEMP.
IS ABOVE/BELOWIS ABOVE/BELOW
IS ABOVE/BELOWIS ABOVE/BELOW
IS ABOVE/BELOW
SetpointSetpoint
SetpointSetpoint
Setpoint
TEMP.:TEMP.:
TEMP.:TEMP.:
TEMP.:
ABOVEABOVE
ABOVEABOVE
ABOVE
XX
XX
X
XX
XX
X
BELOWBELOW
BELOWBELOW
BELOW
ABOVEABOVE
ABOVEABOVE
ABOVE
XX
XX
X
XX
XX
X
BELOWBELOW
BELOWBELOW
BELOW
XX
XX
X
AUTOAUTO
AUTOAUTO
AUTO
ONON
ONON
ON
FANFAN
FANFAN
FAN
SWITCHSWITCH
SWITCHSWITCH
SWITCH
G YG Y
G YG Y
G Y
W W
W W
W
TERMINALS THATTERMINALS THAT
TERMINALS THATTERMINALS THAT
TERMINALS THAT
ARE "ON"ARE "ON"
ARE "ON"ARE "ON"
ARE "ON"
COOLCOOL
COOLCOOL
COOL
OFFOFF
OFFOFF
OFF
AUTOAUTO
AUTOAUTO
AUTO
ONON
ONON
ON
HEAHEA
HEAHEA
HEA
TT
TT
T
ABOVEABOVE
ABOVEABOVE
ABOVE
BELOWBELOW
BELOWBELOW
BELOW
XX
XX
X
ABOVEABOVE
ABOVEABOVE
ABOVE
XX
XX
X
BELOWBELOW
BELOWBELOW
BELOW
XX
XX
X
XX
XX
X
AUTOAUTO
AUTOAUTO
AUTO
ONON
ONON
ON
ABOVEABOVE
ABOVEABOVE
ABOVE
BELOWBELOW
BELOWBELOW
BELOW
ABOVEABOVE
ABOVEABOVE
ABOVE
XX
XX
X
BELOWBELOW
BELOWBELOW
BELOW
XX
XX
X
SYSTEMSYSTEM
SYSTEMSYSTEM
SYSTEM
SWITCHSWITCH
SWITCHSWITCH
SWITCH