Carrier 58CMA - Manual (Page 11)

MAINTENANCE
The ability to properly perform maintenance on this equip-
ment requires certain expertise, mechanical skills, tools, and
equipment. If you do not possess these, do not attempt to
perform any maintenance on this equipment other than those
procedures recommended in the User’s Manual. FAILURE
TO FOLLOW THIS WARNING COULD RESULT IN
POSSIBLE DAMAGE TO THIS EQUIPMENT, SERIOUS
PERSONAL INJURY, OR DEATH.
Before performing any service functions, unless operations
specifically require power to be on, make sure all utilities are
turned off upstream of appliance. Failure to comply with this
warning will cause a fire hazard and/or bodily harm.
To avoid personal injury, make sure electrical supply power
is off before servicing. Failure to follow this warning could
lead to electrical shock, fire, or death.
Step 1—General
In order to keep this furnace in good operating condition and to
maintain its warranty, the furnace MUST be serviced on an annual
basis. This servicing includes a nozzle change, a burner inspection,
a visual check of tube passages through flue outlet and cleanout
ports, and a visual inspection of combustion chamber when burner
is removed.
Depending on above inspection, service could also include a
cleaning and vacuuming of heat exchanger tubes and possibly the
heat exchanger drum section.
Removal of any heat exchanger components which are sealed by
gaskets requires replacement of gasket.
Failure to replace any heat exchanger gaskets with new
gaskets when any heat exchanger plates or covers are re-
moved could lead to heat exchanger leakage, sooting, and/or
a hazardous condition capable of causing bodily harm.
This furnace should never be operated without an air filter.
Disposable filters should be replaced at least once a year. If
equipped to provide cooling, filters should be replaced a minimum
of twice a year. Permanent filters should be cleaned at least twice
a year.
ALWAYS KEEP MAIN OIL VALVE TURNED OFF IF
BURNER IS SHUT DOWN FOR AN EXTENDED PERIOD OF
TIME.
Step 2—Oil Burner
For optimum performance, oil burner nozzle should be replaced
once a year. Contact your service technician if you are unsure of
this procedure.
The procedure for nozzle installation and/or replacement is out-
lined in oil burner instruction manual which came with furnace.
After replacement of nozzle, burner should be adjusted in accor-
dance with Combustion Check section of this instruction.
Step 3—Heat Exchanger and Flue Pipe
Ordinarily, it is not necessary to clean heat exchanger or flue pipe
every year, but it is necessary to have your service technician
check unit before each heating season to determine whether
cleaning or replacement of parts is required.
If cleaning is necessary, the following steps should be performed:
1. Turn off all oil and electrical supplies upstream of furnace.
If furnace has been in operation, some surfaces may be hot.
Allow time for unit to cool down personal injury will result.
2. Disconnect flue pipe.
3. Remove flue collar panel located in front part of furnace.
4. Remove baffle from secondary heat exchanger.
5. Disconnect oil line and remove oil burner from furnace.
6. Open 2 cleanout doors located in upper part of front panel of
furnace.
7. Clean secondary tubes, and primary cylinder with stiff brush
and vacuum cleaner.
8. Before re-assembly, the heat exchanger and combustion
chamber should be inspected to determine if replacement is
required.
9. After cleaning, replace baffle, flue collar plate, oil burner, and
close the 2 cleanout access doors. Reconnect flue pipe and oil
line.
10. Re-adjust burner for proper operation.
Step 4—Blower Removal
To remove blower from furnace:
1. Turn off all oil and electrical supplies upstream of furnace.
2. Remove burner access and blower door.
3. Remove blower retaining screw (on blower shelf).
Table 12—Airflow Data (CFM)
UNIT
SIZE
BLOWER
SPEED
EXTERNAL STATIC PRESSURE IN. WC
0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
105-12
High 1425 1350 1305 1250 1170 1030 925 805
Med-High 1130 1045 1000 950 885 820 745 670
Med-Low 840 810 770 740 685 635 580 500
Low 725 730 740 745 730 715 690 665
120-20
High 2080 2041 1965 1864 1702 1576 1474 1336
Med-High 1892 1859 1770 1675 1550 1449 1330 1217
Med-Low 1556 1475 1394 1318 1211 1134 1051 938
Low 1221 1164 1081 998 926 855 782 653
NOTES:
1. Airflow values in cubic ft per minute (CFM) rounded to nearest 5 CFM.
2. Data taken with filters in place.
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