Sequence Of Operation; Adaptive Heating Mode - Carrier 58TUA Installation, Start-Up, And Operating Instructions Manual

BLK
BLK
WHT WHT
GND
115-VOLT FIELD- JUNCTION
SUPPLIED BOX
FUSED
DISCONNECT
Fig. 9—Heating and Cooling Application Wiring Diagram 2-Stage Thermostat and Condensing Unit
SETUP
SWITCH NO.
SW-1
Only High-Gas Heat
SW-2
Low-Gas Heat (Adaptive Mode)
SW-3 and SW4
Table 7—Blower Off Delay Setup
Switch (SW) Position
DESIRED HEATING
MODE BLOWER OFF
DELAY (SEC)
90
135
180
225
This furnace is equipped with a manual reset limit switch in
the gas control area. The switch will open and shut off power
to the gas valve if a flame rollout or overheating condition
occurs in the gas control area. DO NOT bypass the switch.
Correct inadequate combustion-air supply, component fail-
ure, or restricted flue gas passageway before resetting the
switch.
Before operating the furnace, check each manual reset switch for
continuity. If necessary, press and release the button to reset the
switch.
SIX
W2 W1
WIRE
THREE-WIRE
HEATING-
ONLY
W2
COM
W/W1
Y/Y2
R
CONTROL
G
BOX
24-VOLT
TERMINAL
BLOCK
NOTE: Connect Y-terminal as
FURNACE
Table 6—Setup Switch Description
NORMAL
POSITION
OFF (Staged Gas
Heat)
OFF (Single-Stage Thermostat)
ON, OFF
SETUP SWITCH
SW-3 SW-4
OFF OFF
OFF ON
ON OFF
ON ON
FIELD 24-VOLT WIRING
FIELD 115-, 208/230-, 460-VOLT WIRING
FACTORY 24-VOLT WIRING
FACTORY 115-VOLT WIRING
2-STAGE
THERMOSTAT
Y2 R G Y1
TERMINALS
C
Y1
Y2
2-SPEED
CONDENSING
UNIT
NOTE: If any of the original wire,
shown for proper
operation.
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; con-
trol selects low-gas-heat or high-gas-heat operation based on pre-
vious cycles. Turn switch on for installations with 2-stage thermo-
stats to permit only low-gas-heat operation in response to closing
R-W/W1. High-gas heat is supplied only when R to W/W1 and W2
are closed.
Switches control gas heating mode blower off delay. (See Table
7.)

SEQUENCE OF OPERATION

Using the schematic diagram in Fig. 12, follow the sequence of
operation through the different modes. Read and follow the
diagram very carefully.
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
(See Fig. 8 for thermostat connections.)
NOTE: With the high-heat-only switch SW-1 off, the low-heat-
only switch SW-2 selects either the low-heat-only operation mode
when on (see item 2 below), or the adaptive heating mode when off
in response to a call for heat. (See Fig. 10.) When the high-heat-
only switch (SW-1) is in the ON position, it always causes
high-gas-heat operation when the R-W/W1 circuit is closed,
9
FIELD-SUPPLIED
FUSED DISCONNECT
208/230- OR
460-VOLT
THREE
PHASE
208/230-
VOLT
SINGLE
PHASE
GND
as supplied, must be replaced, use
same type or equivalent wire.
DESCRIPTION
OF USE
A93379