SECTION IV – Start-up (All Models)
Before beginning any start-up operation, the start-up
personnel should familiarize themselves with the unit,
options and accessories, and control sequence to under stand
the proper system operation. All personnel should have a
good working knowledge of general start-up procedures and
have the appropriate start-up and balancing guides available
for consultation.
The building must be completely nished including doors,
windows, and insulation. All internal walls and doors should
be in place and in the normal position. In some cases the
interior decorations and furniture may inuence overall
system performance. The entire building should be as
complete as possible before beginning any system balancing.
The initial step in any start-up operation should be a nal
visual inspection. All equipment, plenums, duct-work, and
piping should be inspected to verify that all systems are
complete and properly installed and mounted, and that no
debris or foreign articles such as paper or drink cans are left
in the units or other areas.
Each unit should be checked for loose wires, free blower
wheel operation, and loose or missing access panels or doors.
Except as required during start-up and balancing operations,
no fan coil units should be operated without all the proper
ductwork attached, supply and return grilles in place, and all
access doors and panels in place and secure. A clean lter of
the proper size and type must also be installed. Failure to do
so could result in damage to the equipment or building and
furnishings and/or void all manufacturer’s warranties.
Cooling/Heating System
Prior to the water system start-up and balancing, the chilled/
hot water systems should be ushed to clean out dirt and
debris which may have collected in the piping during
construction. During this procedure, the system should be
ushed from the supply riser to the return riser through a
cross-over loop at the end of the riser column, and all unit
service valves must be in the closed position. This prevents
foreign matter from entering the unit and clogging the
valves and metering devices. Strainers should be installed in
the piping mains to prevent this material from entering the
units during normal operation.
During system lling, air venting from the unit is
accomplished by the use of the standard, manual air vent
tting, or the optional, automatic air vent tting installed
on the coil. Venting can be accomplished by depressing the
needle valve core. Automatic air vents may be unscrewed
one turn counterclockwise to speed initial venting, but
should be screwed in for automatic venting after start-up
operations.
CAUTION: The air vent provided on the unit is
not intended to replace the main system air
vents and may not release air trapped in other
parts of the system. Inspect the entire system for
potential air traps and vent those areas as required,
independently. In addition, some systems may require
repeated venting over a period of time to properly
eliminate air from the system.
Air System Balancing
All duct stubs, grilles, lters, and return-access panels must
be properly installed to establish actual system operating
conditions BEFORE beginning air balancing operations.
Each individual unit and the attached ductwork is a unique
system with its own operating characteristics. For this reason,
air balancing is normally done by balance 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 unqualied
personnel.
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General