Checking Heat Tape Operation (If Applicable); Winterizing - Carrier 58MCB Service And Maintenance Instruction

THREE-WIRE
HEATING-ONLY
BLOWER DOOR SWITCH
BLK BLK
WHT WHT
GND
AUXILIARY
115-V FIELD-
J-BOX
SUPPLIED
DISCONNECT
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.
Step 8—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.
UNIT AND PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in furnace compo-
nent 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 or lower, freeze protection measures must be taken. (See
Fig. 17.) See CONDENSATE DRAIN PROTECTION sec-
tion of Installation, Start-Up, and Operating Instructions.
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.
NOTE 2
W C
FIVE WIRE
W
C
R
O
N
T
GND
R
G
O
COM
L
NOTE 1
Y
24-V
TERMINAL
BLOCK
NOTES:
FURNACE
Fig. 15—Field Wiring
FIELD 24-V WIRING
FIELD 115-, 208/230-, 460-V WIRING
FACTORY 24-V WIRING
FACTORY 115-V WIRING
THERMOSTAT
R G Y
TERMINALS
CONDENSING
UNIT
TWO
WIRE
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.
Step 9—Winterizing
UNIT DAMAGE HAZARD
Failure to follow this caution may result in furnace compo-
nent damage.
Freezing condensate left in the furnace may 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. 18.)
4. Connect field-supplied 1/2-in. I.D. tube to upper inducer
housing drain connection.
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 equiva-
lent) into funnel until it is visible at point where condensate
enters open drain. (See Fig. 19.)
6. Reconnect drain cap to inducer housing.
7. Replace main furnace door.
8. Propylene glycol need not be removed before restarting
furnace.
10
FIELD-SUPPLIED
DISCONNECT
208/230- OR
460-V
THREE
PHASE
208/230-V
SINGLE
PHASE
GND
A02174