Carrier 42V - Manual (Page 68)

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Standard motors are permanently sealed and lubricated. No
lubrication is required unless special motors have been
supplied or unusual operating conditions exist.
Clean Fan Wheel — Lock open and tag unit electrical
service switch.
For access to fan assembly, remove front or bottom panel.
Fan assembly may be removed from its tracks if unit has a long
conduit lead. Use a stiff brush or vacuum to remove dirt and
debris from scroll. Wipe all fan surfaces with a damp cloth.
Clean Electric Heater — Lock open and tag unit elec-
trical service switch.
1. Remove dust, dirt, or foreign material before start-up. Do
not block normal airflow to and from units; blockage may
damage electric heaters.
2. Clean heater elements with soft brush or vacuum cleaner
as necessary.
3. To replace blown fusible links (nichrome heaters only):
a. Remove fan deck (horizontal units only) for
access to heater.
b. Remove nut securing link at each end; install new
link; reinstall nuts.
c. Reinstall fan deck (if removed).
Electric resistance heaters typically require no normal peri-
odic maintenance when unit air filters are changed properly.
The operation and service life may be affected by other condi-
tions and equipment in the system. The two most important op-
erating conditions for an electric heater are proper airflow and
proper supply voltage. High supply voltage and/or poorly dis-
tributed or insufficient airflow over the element will result in
element overheating. This condition may result in the heater
cycling on the high-limit thermal cutout. The high-limit ther-
mal cutout device is a safety device only and is not intended for
continuous operation. With proper unit application and opera-
tion, the high-limit thermal cutout will not operate. This device
only operates when a problem exists, and ANY condition that
causes high-limit cutout MUST be corrected immediately.
High supply voltage also causes excessive amperage draw and
may trip the circuit breaker or blow the fuses on the incoming
power supply.
After proper airflow and supply power are assured, regular
filter maintenance is important to provide clean air over the
heater. Dirt that is allowed to deposit on the heating element
will cause hot spots and eventual element burn through. These
hot spots will normally not be enough to trip the high-limit
thermal cutout device and may not be evident until actual heat-
er element failure.
Clean or Replace Air Filters — Lock open and tag
unit electrical service switch.
At the start of each cooling season and after each month of
operation (more or less depending on operating conditions) re-
place throwaway filter or clean permanent filter.
THROWAWAY FILTER — Replace filter with a good qual-
ity filter of the size shown in Tables 1-4. Do not attempt to
clean and reuse disposable filters.
PERMANENT FILTER (FIBERGLASS TYPE)
1. Tap on solid surface to dislodge heavy particles.
2. Wash in hot water. If needed, use mild solution of com-
mercial solvent such as sal soda or trisodium phosphate.
3. Set filter on end so that water drains out through slots in
frame. Allow filter to dry thoroughly.
4. Recharge filter with Film-Cor or similar recharging oil.
Three ounces is sufficient for medium size filter. Oil may
be applied by insect spray gun. For easier spraying, the oil
can be warmed.
If the filter is dipped in the recharging oil, remove it im-
mediately and allow draining through slots in frame.
5. Replace filter in unit.
If another type of filter is used, follow the filter manufacturer's
instructions.
Warranty — All equipment and components sold through
the Parts Department are warranted under the same conditions
as the standard manufacturer's warranty with the exception that
the warranty period is thirty (30) days unless the component is
furnished as a warranty replacement. Parts furnished as war-
ranty replacements are warranted for the remaining term of the
original unit warranty or not less than thirty (30) days.