With power to the unit disconnected, check all electrical connec-
tions for tightness. Tighten all screws on electrical connections. If
any smoky or burned connections are found, disassemble the
connection, clean all parts, strip wire, and reassemble properly and
securely.
Reconnect electrical supply to unit and observe unit through 1
complete operating cycle for proper operation.
CAUTION:
UNIT
AND
PROPERTY
DAMAGE
HAZARD
Failure to follow this caution may result in furnace
component failures or water property damage.
If this furnace is to be operated in an unconditioned space
where the ambient temperatures may be 32°F or lower,
freeze protection measures must be taken. See Fig. 13.
See CONDENSATE DRAIN PROTECTION section of
Installation, Start-Up, and Operating Instructions.
VIII.
CHECKING HEAT TAPE OPERATION
(IF APPLICABLE)
In applications where the ambient temperature around the furnace
is 32°F or lower, freeze protection measures are required. If heat
tape has been applied, check to ensure it will operate when low
temperatures are present.
NOTE:
Heat tape, when used, should be wrapped around the
condensate drain trap and drain line. There is no need to use heat
tape within the furnace casing. Most heat tapes are temperature
activated, and it is not practical to verify the actual heating of the
tape. Check the following:
1. Check for signs of physical damage to heat tape such as
nicks, cuts, abrasions, gnawing by animals, etc.
2. Check for discolored heat tape insulation. If any damage or
discolored insulation is evident, replace the tape.
3. Check that heat tape power supply circuit is on.
IX.
WINTERIZING
CAUTION:
UNIT DAMAGE HAZARD
Failure to follow this caution may result in furnace
component damage.
Freezing condensate left in the furnace will damage the
furnace.
If the furnace will be off for an extended period of time in a
structure where the temperature will drop to 32°F or below,
winterize as follows:
1. Turn off electrical supply to furnace.
2. Remove main furnace door.
3. Disconnect drain cap from unused drain tap on inducer
housing. (See Fig. 14.)
4. Connect field-supplied 1/2-in. I.D. tube to upper inducer
housing drain connection.
CAUTION:
UNIT DAMAGE HAZARD
Failure of plastic components may occur.
Do not use ethylene glycol (Prestone II antifreeze/coolant
or equivalent automotive type).
5. Insert funnel in tube and pour up to one quart of antifreeze,
propylene glycol (RV, swimming pool antifreeze, or
equivalent) into funnel until it is visible at point where
condensate enters open drain. (See Fig. 15.)
6. Reconnect drain cap to inducer housing.
7. Replace main furnace door.
8. Propylene glycol need not be removed before restarting
furnace.
WIRING DIAGRAM
See Fig. 16 for Wiring Diagram.
Fig. 11—Field Wiring
A02174
115-V FIELD-
SUPPLIED
DISCONNECT
AUXILIARY
J-BOX
24-V
TERMINAL
BLOCK
THREE-WIRE
HEATING-ONLY
FIVE WIRE
NOTE 1
NOTE 2
FIELD-SUPPLIED
DISCONNECT
CONDENSING
UNIT
TWO
WIRE
FURNACE
C
O
N
T
R
O
L
R
G
COM
W
C
R
G
Y
GND
GND
FIELD 24-V WIRING
FIELD 115-, 208/230-, 460-V WIRING
FACTORY 24-V WIRING
FACTORY 115-V WIRING
208/230- OR
460-V
THREE
PHASE
208/230-V
SINGLE
PHASE
BLOWER DOOR SWITCH
WHT
BLK
WHT
BLK
NOTES:
Connect Y-terminal in furnace as shown for proper blower operation.
Some thermostats require a "C" terminal connection as shown.
If any of the original wire, as supplied, must be replaced, use
same type or equivalent wire.
W
Y
GND
THERMOSTAT
TERMINALS
1.
2.
3.
—9—
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