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Single Stage furnaces with single-stage thermostat, 327893–101
Single Stage furnaces with two-stage thermostat, 327892–101
Two Stage furnaces with single-stage or 2-stage thermostat, 327891–101
4. Attach twinning reference label 327956–101 on outside of blower access door of RH furnace blower door.
5. Turn on power and gas to both furnaces.
6. Reinstall blower access doors on both furnaces.
7. Operate furnaces through 2 cycles in each mode to confirm correct operation by operating only thermostat.
a. Single-stage gas heating thermostat R-to-W operates both furnaces gas heat mode. First stage of a 2-stage thermostat causes LH furnace
to operate in gas-heat mode. Second stage of a 2-stage thermostat causes both furnaces to operate in gas heat mode.
b. Single stage thermostat operates first or second stage of a two stage furnace, based on the furnace control board algorithm. 2-stage
heating thermostat R-to-W/W1 will operate both furnaces in low heat mode. Thermostat R to W/W1 and-W2 causes both furnaces to
operate in high gas-heat mode.
c. Thermostat R-to-G for continuous fan or low-cooling blower.
Fig. 15—Two Stage Furnaces and 1 Stage A/C Unit-One or Two Stage Thermostat
A02229
THERMOSTAT
RELAY 1
PLC
ALS-M
PLA
RELAY 2
NOTE #5
W2
Y/Y2
G
W/W1
R
C
OM
Y1
BLK
WHT
TEST/TWIN
TKR
BLU
SEC-2
SEC-1
TRAN
WHT
BLK
L2
NOTE #2
PR1
BLK
WHT
RED
YEL
PLB
W2
Y/Y2
G
W/W1
R
C
OM
Y1
TEST/TWIN
BLU
SEC-2
SEC-1
4
1
3
2
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
ACRDJ
AIR CONDITIONING RELAY DISABLE JUMPER
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)
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.
Two-stage heating can be accomplished by one of the two methods:
a.
Using one stage thermostat and letting the Main Furnace’s (LH)
algorithm control low and high-heat operation.
b.
Using a two-stage thermostat to control low and high-heat
operation. (Apply "W2" Wire)
NOTES:
LHT
OFF
DLY
2
ON
OF
F
THERMOSTAT
TYPE
LEFT HAND
LHT SWITCH 1
RIGHT HAND
LHT SWITCH 1
1
3
TWO STAGE
THERMOSTAT
ON
ON
W2
Y1
G
D
HUM
W/W1
R
C
OM
Y/Y2
327891-101 REV. A
NOTE #3
NOTE #6
4
1
3
2
D
HUM
2 STG FURNACES / 1 STG A/C UNIT - TWO-STAGE OPERATION
FIELD SUPPLIED RELAYS
FIELD INSTALLED AIR CONDITIONING WIRING (WHEN REQUIRED)
OFF
ON
D
HUM
MAIN ( LH ) FURNACE
SECONDARY ( RH ) FURNACE
ONE STAGE
THERMOSTAT
—20—