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1. Connect Y-terminal in furnace as shown for proper blower 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.
FIELD 24--VWIRING
FIELD 115--, 208/230--, 460--VWIRING
FACTORY 24--VWIRING
FACTORY 115--V WIRING
NOTE 2
208/230-- OR
460--V
THREE
PHASE
208/230--V
SINGLE
PHASE
FURNACE
115--V FIELD--
AUXIL IARY
O
SUPPLIED
J--BOX
L
DISCONNECT
24--V
TERMINAL
TWO
BLOCK
THREE--WIRE
HEATING--O NLY
FIVE WIRE
DISCONNECT
NOTE 1
FIELD--SUPPLIED
CONDENSING
UNIT
WIRE
C
O
N
T
R
R
G
WC RG Y
GND
GND
BLOWER DOOR SWITCH
WHT
BLK
WHT
BLK
W
GND
THERMOSTAT
TERMINALS
A02174
NOTES:
Fig. 17 -- Field Wiring
A07727
Blower Off
Delay Jumper
24 VAC
HUM
FUSE
115 VAC
HUM
Diagnostic Light
EAC
Fig. 18 -- Control Center
4. Check igniter resistance. Igniter resistance is affected by
temperature. Only check resistance when the igniter i s at
room temperature.
a. Using an ohm meter , check resistance across both
igniter leads in connector.
b. Cold reading should be between 40 ohms and 70 ohms.
5. Remove igniter.
BURN HAZARD
Failure to follow this caution may result in personal injury .
Allow igniter to cool before removal. Normal operating
temperatures exceed 2000°F (1093°C).
CAUTION
!
a. Using a 1/4 in. nut driver, remove the single screw
securing the igniter bracket to the burner box and
carefully withdraw the igniter through the bottom of the
burner box without striking the igniter on surrounding
parts.
b. Inspect igniter for signs of damage or failure.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in premature failure
of the igniter .
The igniter is fragile. DO NOT allow it to hit the side of the
burner box opening while removing or replacing it.
CAUTION
!
c. If replacement is required, replace igniter on igniter
bracket and then install assembly into burner box to
avoid damage to the igniter.
6. To replace igniter and bracket assembly, reverse items 5a
and 5b.
7. Reconnect igniter wire connection.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Igniter wires must be securely placed in slot in manifold
grommet or else they could become pinched or severed and
electrically shorted.
!
WARNING
359AAV