Fan Coils
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
12
SECTION THREE — Normal Operation & Periodic Maintenance
package, depending on unit configuration. It is the user’s
responsibility to ensure the tube and piping materials
furnished by IEC, are compatible with the treated water.
Failure to provide proper water quality will void the fan
coil unit’s warranty.
Water Containing
Required Concentration
Sulphate
Less than 200 ppm
pH
7.0 – 8.5
Chlorides
Less than 200 ppm
Nitrate
Less than 100 ppm
Iron
Less than 4.5 mg/l
Ammonia
Less than 2.0 mg/l
Manganese
Less than 0.1 mg/l
Dissolved Solids
Less than 1000 mg/l
CaCO3 Hardness
300 - 500 ppm
CaCO3 Alkalinity
300 - 500 ppm
Particulate Quantity
Less than 10 ppm
Particulate Size
800 micron max
Water System Balancing
A complete knowledge of the hydronic system, along with
its components and controls, is essential to proper water
system balancing. This procedure should not be attempted
by unqualified personnel. The system must be complete,
and all components must be in operating condition
BEFORE beginning water system balancing operations.
Each hydronic system has different operating characteristics
depending on the devices and controls used in the system.
The actual balancing technique may vary from one system
to another.
After the proper system operation is established, the
appropriate system operating conditions such as various
water temperatures and flow rates should be recorded in
a convenient place for future reference.
Before, and during water system balancing, conditions
may exist due to incorrect system pressures which
may result in noticeable water noise or undesired valve
operation. After the entire system is balanced, these
conditions will not exist on properly designed systems.
Controls Operation
Before proper control operation can be verified, all other
systems must be operating properly. The correct water
and air temperatures must be present for the control
function being tested. Some controls and features are
designed to not operate under certain conditions. For
example, on a 2-pipe cooling/heating system with auxiliary
electric heat, the electric heater cannot be energized with
hot water in the system.
A wide range of controls, electrical options and
accessories may be used with the equipment covered
in this manual. Consult the approved unit submittals,
order acknowledgments, and other literature for detailed
information regarding each individual unit and its controls.
Since controls and features may vary from one unit to
another, care should be taken to identify the controls
used on each unit and their proper control sequence.
Information provided by component manufacturers
regarding installation, operation, and maintenance of their
individual controls is available upon request.
SECTION THREE – Normal Operation &
Periodic Maintenance
General
Each unit on a job will have its own unique operating
environment and conditions which may dictate a
maintenance schedule for that unit that is different
from other equipment on the job. A formal schedule of
regular maintenance and an individual unit log should be
established and maintained. This will help to achieve the
maximum performance and service life of each unit on
the job.
Information regarding safety precautions contained in
the preface at the beginning of this manual should be
followed during any service and maintenance operations.
For more detailed information concerning service operations
consult your Sales Representative or the factory.
