Carrier 58TUA Installation, Start-Up, And Operating Instructions Manual page 10

BLK
WHT
GND
115-V FUSED
DISCONNECT
SWITCH
(WHEN REQUIRED)
→
Fig. 9—Heating and Cooling Application Wiring Diagram 1-Stage Thermostat and Condensing Unit
BLK
WHT
GND
115-V FUSED
DISCONNECT
SWITCH
(WHEN REQUIRED)
→
Fig. 10—Heating and Cooling Application Wiring Diagram 2-Stage Thermostat and Condensing Unit
The gas service pressure must not exceed 0.5 psig (14-in. wc), and
no less than 0.16 psig (4.5-in. wc).
Thermostat wire connections at R and W/W1 are the minimum
required for gas heating operation. W2 must be connected for
2-stage heating thermostats. C
cooling, heat pumps, and some clock thermostats. These must be
made at the 24-v terminal block on the control. (See Fig. 11.)
This furnace can be installed with either a single-stage heating or
a 2-stage heating thermostat.
For single-stage thermostats, connect thermostat W to W/W1 at
furnace control terminal block. (See Fig. 9.) For single-stage
1-STAGE THERMOSTAT TERMINALS
FIVE
WIRE
TWO-WIRE
HEATING-
ONLY
W2
BLK
COM
WHT
W/W1
GND
Y/Y2
JUNCTION
BOX
R
CONTROL
G
BOX
24-V
TERMINAL
BLOCK
FURNACE
2-STAGE THERMOSTAT TERMINALS
SEVEN
WIRE
THREE-WIRE
HEATING-
ONLY
W2
BLK
COM
WHT
W/W1
GND
Y/Y2
JUNCTION
BOX
R
CONTROL
G
BOX
24-V
TERMINAL
BLOCK
FURNACE
, Y/Y2, and G are required for
OM
W Y R G C
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.
W2 W1 Y2 R G Y1 C
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.
thermostats, the control will determine, based on length of previ-
ous heating on and off cycles, when to operate in low- and
high-gas heat for optimum comfort. Setup switch-2 (SW-2) must
be in the factory-shipped OFF position. See Fig. 12 and Tables 6
and 7 for setup switch information.
If a 2-stage heating thermostat is to be used, move SW-2 to ON
position at end of furnace installation. This overrides built-in
control process for selecting high and low fire and allows the
2-stage thermostat to select gas heating modes. The W2 from
thermostat must be connected to W2 on control terminal block.
(See Fig. 10.)
10
FIELD 24-V WIRING
FIELD 115-, 208/230-, 460-V WIRING
FACTORY 24-V WIRING
FACTORY 115-V WIRING
FIELD-SUPPLIED
FUSED DISCONNECT
GND
GND
GND
GND
CONDENSING
UNIT
FIELD 24-V WIRING
FIELD 115-, 208/230-, 460-V WIRING
FACTORY 24-V WIRING
FACTORY 115-V WIRING
FIELD-SUPPLIED
FUSED DISCONNECT
GND
GND
C
Y1
GND
Y2
GND
2-SPEED
CONDENSING
UNIT
208/230- OR
460-V
THREE
PHASE
208/230-V
SINGLE
PHASE
A99071
208/230- OR
460-V
THREE
PHASE
208/230-V
SINGLE
PHASE
A99072