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Installation Manual – THH
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THH HIGH PERFORMANCE HORIZONTAL
FAN COIL UNITS
Section 2 – Start-Up
START-UP
Before beginning any start-up operation, the startup personnel should
familiarize themselves with the unit, options and accessories, and control
sequence to understand 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 initial step in any startup operation should be a final 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 duct work attached, supply
and return grilles in place, and all access doors and panels in place and
secure. A clean filter 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 manufacturers’ warranties.
COOLING/HEATING SYSTEM
Prior to the water system start-up and balancing, the chilled/hot water
systems should be flushed to clean out dirt and debris, which may have
collected in the piping during construction. During this procedure,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 filling, air venting from the unit is accomplished by the use
of the standard manual or optional automatic, air vent fitting installed
on the coil. In the case of the manual air vent fitting, the screw should
be turned counterclockwise no more than 1-½ turns to operate the air
vent. 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.
