Adaptive Heating Mode - Carrier 58DXT Operating Instructions Manual

BLK
BLK
WHT WHT
GND
115-V FUSED
DISCONNECT
SWITCH
(WHEN REQUIRED)
Fig. 12—Heating and Cooling Application Diagram With 2-Stage Thermostat and 2-Stage Condensing Unit
Table 6—Setup Switch Description
SETUP NORMAL
SWITCH NO. POSITION
OFF
SW-1
(Staged Gas
Only High-Gas Heat
Heat)
SW-2 OFF
Low-Gas Heat (Single-Stage
(Adaptive Algorithm) Thermostat)
SW-3 and
ON, OFF
SW4
Table 7—Blower Off Delay
Setup Switch Position
DESIRED HEATING
MODE BLOWER OFF
DELAY (SEC)
90
135
180
225
NOTE: If power interruption occurs during "call for heat" (W/W1
or W/W1-and-W2), control starts 90-sec blower only on period 2
sec after power is restored if thermostat is still calling for gas
heating. The red LED flashes code 12 during 90-sec period, after
which LED will be on continuously as long as no faults are
detected. After 90-sec period, furnace responds to thermostat
normally.
2-STAGE THERMOSTAT TERMINALS
SEVEN
W2
WIRE
THREE-WIRE
HEATING-
ONLY
W2
COM
W/W1
Y/Y2
JUNCTION
BOX
R
CONTROL
G
BOX
24-V
TERMINAL
BLOCK
FURNACE
DESCRIPTION OF USE
Turn switch on to obtain only
high-gas-heat operation on
any call for heat regardless of
whether R-W/W1,
or R-W/W1, -W2
is closed. SW-1 overrides
SW-2.
Turn switch off for installations
with single-stage thermostats;
control selects low-gas-heat
or high-gas-heat operation
based on previous cycles.
Turn switch on for installations
with 2-stage thermostats to
permit only low-gas-heat op-
eration in response to closing
R-W/W1. High-gas heat is
supplied only when R to
W/W1 and W2 is closed.
Switches control gas heating
blower off delay. (See Table
7.)
SETUP SWITCH
SW-3 SW-4
OFF OFF
OFF ON
ON OFF
ON ON
W1 Y2 R G Y1 C
2-SPEED
CONDENSING
UNIT
NOTES: 1. Connect Y-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.
4
BLOWER-
Fig. 13—Setup Switches on Furnace Control
Blower door must be installed for power to be conducted through
blower door interlock switch ILK to furnace control CPU, trans-
former TRAN, inducer motor IDM, blower motor BLWM, hot
surface ignitor HSI, and gas valve GV.
1. Adaptive Heating Mode—Single-Stage Thermostat and
2-Stage Heating
(See Fig. 11 for thermostat connections.)
NOTE: With high-heat-only switch SW-1 off, low-heat-only
switch SW-2 selects either low-heat-only operation mode when on
(see item 2 below), or adaptive heating mode when off in response
to "call for heat." (See Fig. 13.) When high-heat-only switch SW-1
is on, it always causes high-gas-heat operation when R-W/W1
circuit is closed, regardless of the setting of low-heat-only switch
SW-2.
11
FIELD 24-V WIRING
FIELD 115-, 208/230-, 460-V WIRING
FACTORY 24-V WIRING
FACTORY 115-V WIRING
FIELD-SUPPLIED
FUSED DISCONNECT
208/230- OR
460-V
THREE
PHASE
208/230-V
SINGLE
C
PHASE
Y1
Y2
GND
3 2
LOW
HEAT
OFF
(ADAPTIVE
DELAY
ALGORITHM)
(Factory Settings)
A97444
1
OFF
ON
HIGH
HEAT
ONLY
A96402