Modular Hi-Rise Replacement Series – MIY
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
20
SECTION FOUR — Start-Up, Cont’d.
Water Treatment
Proper water treatment is a specialized industry
IEC recommends consulting an expert in this field
to analyze the water for compliance with the water
quality parameters listed below, and to specify the
appropriate water treatment regimen. The expert may
recommend typical additives such as rust inhibitors,
scaling preventative, antimicrobial growth agents, or algae
preventatives. Anti-freeze solutions may also be used to
lower the freezing point.
IEC water coil tubes and headers are constructed of
copper. Multiple brass alloys may be present in the valve
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.
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
CaCO
3
Hardness
300 - 500 ppm
CaCO
3
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 two-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
acknowledgements, 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.
When changing from one mode to another (cooling to
heating or heating to cooling), it may take some time to
actually notice a change in the leaving air temperature.
In addition, some units may be designed for a very low
air temperature rise in heating. Before declaring a unit
inoperative or a component defective, it may be necessary
to verify operation by more than one method.