d. One or both LEDs are dim or flickering.
Furnaces are on different phase legs. Disconnect TWIN/TEST lead. If both LEDs are on continuously when TWIN/TEST is
disconnected, furnace line voltage power supply is out of phase.
3. Reconnect lead at TWIN/TEST terminal of LH furnace and observe LED at each furnace. The LEDs will glow steady for proper phasing.
PROCEDURE 7—START-UP AND ADJUSTMENT
Refer to Installation, Start-Up, and Operating Instructions supplied with furnaces for detailed information.
1. Shut off all power and gas to both furnaces.
2. Position blower off delay switches on controls in BOTH furnaces to SAME desired gas heat blower off delay. (See Fig. 16 and 17.) See
furnace Installation, Start-Up, and Operating Instructions for further details.
3. Attach twinning connection wiring label above the existing furnace wiring label on the inside of the L/H furnace blower access door. Use
the following labels for the following applications:
Fig. 14—Single Stage Furnaces and A/C-Two Stage Thermostat
A02228
THERMOSTAT
RELAY 1
PLC
ALS-M
PLA
RELAY 2
NOTE #5
Y1
Y/Y2
G
W
R
C
OM
BLK
WHT
TEST/TWIN
TKR
BLU
SEC-2
SEC-1
TRAN
WHT
BLK
L2
NOTE #2
PR1
BLK
WHT
RED
YEL
PLB
Y/Y2
G
W
R
C
OM
Y1
TEST/TWIN
BLU
SEC-2
SEC-1
BLK
WHT
RED
YEL
PLB
RED
TRAN
WHT
BLK
L2
NOTE #2
PR1
MAKE NO THERMOSTAT
CONNECTIONS TO
SECONDARY OR RH
FURNACE
1
2
ORN
BLU
RED
EXTENSION HARNESS
(IF USED)
PLA
1
2
ORN
BLU
ILK-1
ALS-S
NOTE #1
ORN
NOTE #3
24 VAC
TRANSFORMER (FIELD SUPPLIED) NOTE #4
115 VAC
C
Y
OUTDOOR UNIT
NO. 1
C
Y
OUTDOOR UNIT
NO. 2
LEGEND:
1.
ALS-S and ILK-1 are located in the SECONDARY or RH furnace
blower compartment.
2.
Primary connections of transformer not shown; refer to furnace
wire label.
3.
When extension harness is not required PLA and PLB must be
routed through holes in casings.
4.
Transformer = 115 VAC primary / 24 VAC secondary / 40VA.
5.
Relays = 24 VAC coils / pilot duty / normally open.
6.
Y1 and DHUM terminal not available on "RED" LED control board.
NOTES:
W2
Y1
G
W/W1
R
C
OM
Y/Y2
NOTE #3
327892-101 REV. A
NOTE #6
NOTE #6
D
HUM
D
HUM
4
1
3
2
4
1
3
2
FIELD INSTALLED AIR CONDITIONING WIRING (WHEN REQUIRED)
SINGLE STAGE FURNACE & A/C-TWO STAGE THERMOSTAT
ALS-M
MAIN AUX. LIMIT SW., OVERTEMP-MANUAL
RESET, SPST - (N.C.)
ALS-S
SECONDARY AUX. LIMIT SW.,
OVERTEMP-MANUAL RESET, SPST - (N.C.)
ILK-1
SECONDARY AUX. BLOWER DOOR
INTERLOCK SWITCH, SPST - (N.O.)
PLA
2-CIRCUIT TWINNING KIT CONNECTOR
PLB
4 - CIRCUIT TWINNING KIT CONNECTOR
PLC
1 - CIRCUIT TWINNING KIT IN-LINE SPLICE
TEST/TWIN COMPONENT TEST & TWINNING TERMINAL
TKR
TWINNING KIT RELAY, SPST - (N.O.)
TRAN
TRANSFORMER - 115VAC / 24VAC
(PART OF FURNACE)
115 VOLT WIRING
TWINNING KIT EXTENSION HARNESS (REQUIRED)
FIELD WIRING
FACTORY WIRING (TWINNING KIT)
FIELD SUPPLIED RELAYS
MAIN ( LH ) FURNACE
SECONDARY ( RH ) FURNACE
—19—