ENVIRO-TEC
18
FORM ET115.24-NOM11 (118)
COIL
Coils may be cleaned in place by removing the motor/
blower assemblies and brushing the entering air face
between fins with a soft brush parallel to fins. Do not
brush perpendicular to fin orientation as damage may
occur. Brushing should be followed by cleaning with a
vacuum cleaner. If a compressed air source is available,
the coil may also be cleaned by blowing air through the
coil fins from the leaving air face. Vacuuming should
again follow this. Units provided with the proper type
of air filters, replaced regularly, may require periodic
coil cleaning.
ELECTRIC RESISTANCE HEATER ASSEMBLY
Electric resistance heaters typically require no normal
periodic maintenance when unit air filters are changed
properly. Other conditions and equipment may affect the
operation and service life in the system. The two most
important operating conditions for an electric heater are
proper airflow and proper supply voltage. High supply
voltage and/or poorly distributed 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. Open wire type heaters provided
have an automatic reset switch with a back-up high
limit thermal switch. Automatic reset switches are as
the name implies; they reset automatically after the
heater has cooled down. The high limit thermal cutout
device is a manual reset safety device. With proper
unit application and during normal operation, the high
limit thermal cutout will not operate. This device only
operates when some problem exists. ANY condition
that causes high limit cutout MUST be corrected
immediately. Once the high limit trips, it may be reset
once the unit has cooled down. Refer to troubleshooting
section for high limit reset instructions. High supply
voltage also causes excessive amperage draw and may
result in tripping of the circuit breaker or blowing of
the fuses on the incoming power supply.
ELECTRICAL WIRING & CONTROLS
The electrical operation of each unit is determined by
the components and wiring of the unit and may vary
from unit to unit. Consult the wiring diagram for the
actual type and number of controls provided on each
unit. The integrity of all electrical connections should be
verified at least twice during the first year of operation.
Afterwards, all controls should be inspected regularly
for proper operation. Some components may experience
erratic operation or failure due to age. Wall thermostats
may also become clogged with dust and lint and should
be periodically inspected and cleaned to provide reliable
operation.
When replacing any components such as fuses,
contactors, or relays, use only the exact type, size, and
voltage component as furnished from the factory. Any
deviation without factory authorization could result
in personnel injury or damage to the unit and will
void all factory warranties. All repair work should be
done in such a manner as to maintain the equipment in
compliance with governing codes and ordinances or
testing agency listings.
More specific information regarding the use and
operating characteristics of the standard controls offered
by this manufacturer is contained in other manuals.
VALVES & PIPING
No formal maintenance is required on the valve package
components most commonly used with fan coil units
other than a visual inspection for possible leaks in the
course of other normal periodic maintenance. In the
event that a valve should need replacement, the same
precautions taken during the initial installation to protect
the valve package from excessive heat should also be
used during replacement. If a strainer is ordered with
the unit the strainer must be cleaned periodically along
with other scheduled maintenance. In some cases, the
valve actuator may fail and usually can be replaced
without removing valve body from piping.
