ENVIRO-TEC
24
FORM ET115.24-NOM4 (819)
SECTION 2 - START-UP
AIR SYSTEM BALANCING
All ductwork must be complete and connected, and
all grilles, filters, and access doors and panels must be
properly installed to establish actual system operating
conditions BEFORE beginning air balancing opera-
tions.
Each individual unit and associated ductwork is a
unique system with its own operating characteristics.
For this reason, air balancing is normally done by bal-
ance specialists who are familiar with all procedures
required to properly establish air distribution and fan
system operating conditions. These procedures should
not be attempted by unqualified personnel.
After the proper system operation is established, the
actual unit air delivery and the actual fan motor amper-
age draw for each unit should be recorded in a conve-
nient place for future reference such as the inspection,
installation, and start-up check sheet
(
see
SECTION
4 - INSPECTION, INSTALLATION & START-UP
CHECKLIST).
Contact the Sales Representative or the
factory for additional copies of this sheet.
WATER SYSTEM BALANCING
A complete knowledge of the hydronic system, its
components, and controls is essential to proper water
system balancing and this procedure should not be at-
tempted by unqualified personnel. The system must
be complete and all components must be in operating
condition BEFORE beginning water system balancing
operations. All connections must be checked to ensure
they are adequately tightened after shipment; compo-
nents may loosen during shipment to job site
Each hydronic system has different operating charac-
teristics depending on the devices and controls 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 vari-
ous water temperatures and flow rates should be re-
corded in a convenient place for future reference such
as the inspection, installation, and start-up check sheet
(
see
SECTION 4 - INSPECTION, INSTALLATION &
START-UP CHECKLIST).
Before and during water system balancing, conditions
may exist which can result in noticeable water noise or
undesired valve operation due to incorrect system pres-
sures. After the entire system is balanced, these condi-
tions will not exist on properly designed systems. If
unit is ordered with P.T. ports, these should be used to
measure the pressure differential across the coil.
CONTROLS OPERATION
Before proper control operation can be verified all
other systems must be in proper operation. The correct
water and air temperatures must be present for the con-
trol function being tested. Some controls and features
are designed not to operate under certain conditions.
A wide range of controls and electrical options and
accessories may be used with the equipment covered
in this manual. Consult the approved unit submittals,
order acknowledgement, and other manuals for de-
tailed 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 to be 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.
Fan coil units, which allow water flow
through the coils while the fan is in the
OFF position, can create condensation on
the exterior of the cabinet.
Summary of Contents for VHA
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