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13
UNIT AND PROPERTY DAMAGE
Failure to follow this caution may result in furnace
component failures or water property damage.
Operating a unit without a filter or with the blower access
door removed could cause damage to the furnace blower
motor. Dust and lint on internal parts of furnace can cause a
loss of efficiency. If this furnace is to be operated in an
unconditioned space where the ambient temperatures may
be 32_F(0_C)or lower, freeze protection measures must be
taken. See CONDENSATE DRAIN PROTECTION section
of Installation, Start--up, and Operating Instructions. (See
Fig. 17.)
CAUTION
!
Step 9 — Winterizing
UNIT DAMAGE HAZARD
Failure to follow this caution may result in furnace
component damage.
Freezing condensate left in the furnace may damage the
furnace.
CAUTION
!
If the furnace will be off for an extended period of time in a
structure where the temperature will drop to 32_F(0_C)or below,
winterize as follows:
1. Turn off electrical supply to furnace.
2. Remove main furnace door.
3. Disconnect upper inducer housing drain connection cap
from inducer housing. (See Fig. 18.)
4. Connect field--supplied 1/2--in. I.D. inducer housing tube to
upper inducer housing drain connection.
5. Insert funnel in tube and pour one quart of antifreeze, pro-
pylene glycol (RV, swimming pool antifreeze, or equival-
ent) into funnel/tube until it is visible at point where con-
densate enters open drain. (See Fig. 19.)
UNIT DAMAGE HAZARD
Failure to follow this caution may result in unit component
damage.
Do not use ethylene glycol (Prestone II antifreeze/coolant or
equivalent automotive type).
CAUTION
!
6. Replace drain connection cap and clamp to inducer housing.
7. Replace main furnace door.
8. Propylene glycol need not be removed before restarting fur-
nace.
A07911
Fig. 17 -- Freeze Protection
WIRING DIAGRAMS
See Fig. 21 for wiring diagram.
TROUBLESHOOTING
Use the troubleshooting guide, the status code LED on the furnace
control and the component test to isolate furnace operation
problems.
Status Codes
For an explanation of status codes, refer to service label located on
back of main furnace door or Fig. 20.
NOTE: Removing the blower access door will open the blower
access door switch and terminate 115--v power to the control.
To read current status code, remove main furnace door. The status
code LED can be viewed through the sight glass on the blower
access door.
NOTE: NO thermostat signals may be present at control and all
blower off delays must be completed to view previous codes.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in damage to unit
components.
Make sure limit switch or flame rollout switch wire does
not contact any metal component, such as gas valve. If wire
is shorted, 3--amp fuse on furnace control board will open
and unit will not operate.
CAUTION
!
To retrieve previous codes, remove one of the red main limit or
flame rollout switch wires for 1 to 4 sec until the LED light goes
out, then reconnect it. (Do not leave red wire disconnected for
longer periods of time as the control will assume an
overtemperature condition exists and will respond with blower
operation.) This places the control in the status recall mode and
displays the last code stored in memory.
Record the code. After the last code is displayed the control will
perform the component test, and then return to normal standby
mode.
58MCB