Carrier Furnace - Manual (Page 40)

WINTERIZATION
A 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:
A 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 glycol (RV/swimming pool antifreeze or
equivalent),
2, Turn off gas and electrical supplies to your furnace.
^ WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Turn off electrical power supply to your furnace and
install lockout tag before removing the access doors to
service or perform maintenance.
3, Remove furnace control compartment door,
4, Remove one of the unused rubber plugs in the port on the
collector box opposite the condensate trap. See Fig 3f,
3, Connect a field supplied 3/8-in, (9,3-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, 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,
9, Remove funnel and tube from collector box,
10, Replace plug in collector box.
If, Remove the other plug and repeat steps 4-10,
12, Replace main door,
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.
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