Adaptive Heating Mode - Carrier 58UXT Installation, Start-Up, And Operating Instructions Manual

BLK BLK
WHT WHT
GND
115-VOLT FIELD-
SUPPLIED
FUSED
DISCONNECT
Fig. 11—Heating and Cooling Application Wiring Diagram 1-Stage Thermostat and Condensing Unit
BLK
BLK
WHT WHT
GND
115-VOLT FIELD- JUNCTION
SUPPLIED BOX
FUSED
DISCONNECT
Fig. 12—Heating and Cooling Application Wiring Diagram 2-Stage Thermostat and Condensing Unit
NOTE: If a power interruption occurs during a "call for heat"
(W/W1 or W/W1 and W2) and if the thermostat is still calling for
gas heating, the control will start a 90-sec blower only on period
2 sec after power is restored. The red LED will flash code 12
during the 90-sec period, after which the LED will be on
continuously as long as no faults are detected. After the 90-sec
period, the furnace will respond to the thermostat normally.
The blower door must be installed for power to be conducted
through the blower door interlock switch ILK to the furnace
control CPU, transformer TRAN, inducer motor IDM, blower
motor BLWM, hot surface ignitor HSI, and gas valve GV.
1. Adaptive Heating Mode—Single-Stage Thermostat with
2-Stage Heating
NOTE 2
W
FIVE
WIRE
THREE-WIRE
HEATING-
ONLY
W2
COM
W/W1
NOTE 1
Y/Y2
JUNCTION
BOX
R
CONTROL
G
BOX
24-VOLT
TERMINAL
BLOCK
FURNACE
NOTE 2
C W2
SEVEN
WIRE
FOUR-WIRE
HEATING-
ONLY
W2
COM
W/W1
NOTE 1
Y/Y2
R
CONTROL
G
BOX
24-VOLT
TERMINAL
BLOCK
FURNACE
1-STAGE
THERMOSTAT
C Y R G
TERMINALS
CONDENSING
NOTES: 1. Connect Y/Y2-terminal as shown for proper operation.
2. Some thermostats require a "C" terminal connection as shown.
3. If any of the original wire, as supplied, must be replaced, use
same type or equivalent wire.
2-STAGE
THERMOSTAT
W1 Y2 R G Y1
TERMINALS
2-SPEED
CONDENSING
UNIT
NOTES: 1. Connect Y/Y2-terminal as shown for proper operation.
2. Some thermostats require a "C" terminal connection as shown.
3. If any of the original wire, as supplied, must be replaced, use
same type or equivalent wire.
(See Fig. 11 for thermostat connections.)
NOTE: In response to thermostat call for heat R to W/W1, the
control selects high-stage gas heating only with HIGH HEAT
ONLY switch (SW1) set to ON regardless of the LOW HEAT
switch (SW2) setting. With the HIGH HEAT ONLY switch set to
OFF, LOW HEAT switch selects either low-stage gas heating only
mode when set to ON, or the adaptive heating mode when set to
OFF in response to a thermostat call for heat R to W/W1. (See Fig.
14 for description of switch settings or Fig. 16 for control circuit
diagram.)
This furnace can operate as a 2-stage furnace with a single-
stage thermostat because the furnace control CPU includes a
programmed adaptive sequence of controlled operation, which
10
FIELD 24-VOLT WIRING
FIELD 115-, 208/230-, 460-VOLT WIRING
FACTORY 24-VOLT WIRING
FACTORY 115-VOLT WIRING
FIELD-SUPPLIED
FUSED DISCONNECT
208/230- OR
460-VOLT
THREE
PHASE
208/230-
VOLT
SINGLE
PHASE
GND
UNIT
FIELD 24-VOLT WIRING
FIELD 115-, 208/230-, 460-VOLT WIRING
FACTORY 24-VOLT WIRING
FACTORY 115-VOLT WIRING
FIELD-SUPPLIED
FUSED DISCONNECT
208/230- OR
460-VOLT
THREE
PHASE
208/230-
VOLT
C
SINGLE
Y1 PHASE
Y2
GND
A95236
A95332