International comfort products WFSR040A030 Service And Technical Support Manual page 20

13. Replace main furnace door.
Secondary Heat Exchangers
The condensing side (inside) of the secondary heat
exchanger CANNOT be serviced or inspected without
complete removal of the heat exchanger assembly. Detailed
information on heat exchanger removal can be obtained
from your Distributor.
WINTERIZATION
CAUTION
!
UNIT AND PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in unit
component or property damage.
If the furnace is installed in an unconditioned space
where the ambient temperatures may be 32_ F (0_ C) or
lower, freeze protection measures must be taken to
prevent minor property or product damage.
Since the furnace uses a condensing heat exchanger, some
water will accumulate in the unit as a result of the heat
transfer process. Therefore, once it has been operated, it
cannot be turned off and left off for an extended period of
time when temperatures will reach 32_F (0_C) or lower
unless winterized. Follow these procedures to winterize your
furnace:
CAUTION
!
UNIT COMPONENT DAMAGE HAZARD
Failure to follow this caution may result in damage to the
furnace and other property damage.
Do not use ethylene glycol (automotive antifreeze
coolant or equivalent). Failure of plastic components
may occur.
1. Obtain propylene
antifreeze or equivalent).
2. Turn off gas and electrical supplies to your furnace.
3. Remove furnace control door.
4. Remove the top unused rubber plug from the port on
the collector box opposite the condensate trap. See
Fig. 10.
5. Connect a field supplied 3/8−in. (9.5−mm) ID tube to
the open port on the collector box.
6. Insert a field supplied funnel into the tube.
7. Pour 1 quart of anti−freeze solution into the funnel/
tube. Antifreeze should run through the inducer
housing, overfill condensate trap and flow to an open
drain.
8. Replace the rubber plug in the port on the collector
box.
9. Remove the middle unused rubber plug from the port
on the collector box opposite the condensate trap.
See Fig. 10.
10. Repeat Steps 5 through 8.
11. If a condensate pump is used, check with pump
manufacturer to verify pump is safe for use with
antifreeze used. Allow pump to start and pump anti−
freeze to open drain.
12. Replace main door.
20
glycol (RV/swimming pool
Specifications subject to change without notice.
13. When furnace is re−started, flush condensate pump
with clear water to check for proper operation before
re−starting furnace.
14. Propylene glycol need not be removed before re−
starting furnace.
1-1/4-in.
(31.8)
2-1/2-in.
(64.4)
Fig. 8 − Igniter Position − Top View
Fig. 9 − Igniter Position − Side View
Fig. 10 − Priming Condensate Trap
A11405
2 in.
50 mm
3/8 in.
9.6 mm
3/16 in.
4.6 mm
+ 1/32
1/10 in.
1/16 in.
+0.8
2.5 mm
1.5 mm
L12F041
A11392
440 04 7101 09