Fan Coils
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
8
SECTION ONE — Receipt & Initial Installation, Cont'd.
some location where an indication of drain flow restriction
may be readily observed. Units furnished with a “tell-tale”
connection should be sloped very slightly towards the
drain outlets. The differential height of the trap inlet to
outlet must be at least one inch greater than the total
static pressure on the unit. The height from the drain
outlet to the bottom of the trap must not be less than
the total static pressure. The condensate drain hose
should be secured with a clamp after installing.
Ductwork Connections
All ductwork and/or supply and return grilles should
be installed in accordance with the project plans and
specifications. If not included on the unit or furnished from
the factory, supply and return grilles should be provided as
recommended in the product catalog.
For units with no return-air ductwork, check local code
requirements for possible application restrictions. All units
must be installed in areas that are non-combustible.
Some models are designed to be connected to duct-work
with a MINIMUM amount of external static pressure.
These units may be damaged by operation without
the proper ductwork connected. Consult the approved
submittals and the product catalog for unit external static
pressure limitations.
Units provided with outside air for ventilation should have
some form of low-temperature protection to prevent coil
freeze-up. This protection may be any of several methods
such as a low-temperature thermostat to close the outside
air damper or a preheat coil to temper the outside air
before it reaches the unit.
It should be noted that none of these methods will
adequately protect a coil in the event of power failure.
The safest method of freeze protection is to use glycol in
the proper percent solution for the coldest expected air
temperature.
Horizontal plenum type CPY Short Ship Time (SST) units
may be shipped with a bottom return-air inlet. These units
may be converted to rear return by removing the bottom
inlet filter retainer clips and filter, then removing the
plenum rear panel. The rear panel must then be moved to
the bottom of the unit and reversed so that the top edge
(when rear mounted) is toward the supply end of the unit
and reinstalled on the bottom of the plenum. The panel
should be positioned towards the drain pan to expose
the one-inch wide filter slot for unit-mounted filters. The
panel should be positioned against the rear bottom brace
completely covering the bottom of the plenum on units
with remote filters.
Hi-Performance plenum-type models HPY SST units may
be shipped with a bottom return-air inlet. These units
may be converted to rear return by simply exchanging the
bottom and rear plenum panels.
Flexible duct connections should be used on all air
handling equipment to minimize vibration transmissions.
All ductwork and insulation should be installed to allow
proper access to all components for service and repair
such as filters, motor/blower assemblies, etc.
The manufacturer assumes no responsibility for
undesirable system operation due to improper design,
equipment or component selection, and/or installation
of base unit, ductwork, grilles, and other related
components.
Electrical Connections
The unit serial plate lists the unit electrical characteristics
such as the required supply voltage, fan and heater
amperage and required circuit ampacities. The unit wiring
diagram shows all unit and field wiring. Since each project
is different and each unit on a project may be different,
the installer must be familiar with the wiring diagram and
serial plate on the unit BEFORE beginning any wiring.
All components furnished for field installation by either the
factory or the controls contractor should be located and
checked for proper function and compatibility. All internal
components should be checked for shipping damage, and
any loose connections should be tightened to minimize
problems during start-up.
Any devices such as fan switches or thermostats that
have been furnished from the factory for field installation
