Factory Installed Options; Condensate Overflow Switch - IEC Vertical F*C Series Installation, Operation & Maintenance Manual

IEC Vertical F*C Series Fan Coils
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
construction only with prior factory approval and only in
strict accordance with the instructions issued at that time.

Factory Installed Options

Aquastats: Units with optional factory-furnished and
installed aquastats may be shipped with the aquastats
mounted on a coil stub out. In this circumstance, remove
the aquastat before installation of a valve package. Consult
the factory piping diagram in the approved submittals for
proper location when reinstalling the aquastats. If the valve
package is field-furnished, the aquastat must be installed
in a location where it will sense the water temperature
regardless of control valve position. A bleed bypass may
be required to guarantee proper aquastat operation. The
aquastat bypass line allows a small amount of water to flow
from the supply to the return piping when the control valve
is closed for loop temperature sensing.
NOTE: The aquastat must be able to sense whether the flowing
water is being chilled or heated and switches a contact
closed to provide automatic summer or winter changeover
for the system.

Condensate Overflow switch

The condensate overflow switch is used to detect a clogged
or restricted condensate pan drain. The condensate switch
uses a Normally Closed contact to allow the system control
power to pass through the switch energizing the water
valves and fans allowing normal operation. When an
overflow condition is detected by the switch, it opens the
NC contacts and de-energizes the water valves and fans.
NOTE: All field wiring must be in accordance with governing
codes and ordinances. Any modification of unit
wiring without factory authorization will invalidate all
factory warranties and nullify any agency listings. The
manufacturer assumes no responsibility for any damages
and/or injuries resulting from improper field installation
and/or wiring. Units may be equipped with line voltage
controls or 24 V AC control systems. Some adjustment may
be required for proper operation.
The following descriptions are for typical control sequences
only. For detailed control operating sequence, refer to
thermostat operating instructions.
International Environmental Corporation • Vertical F*C Series Fan Coil Installation, Operation, & Maintenance Manual
12
Standard Wiring Packages
Manual Fan Control — On vertical cabinet units, a 3-speed
fan switch may be furnished unit-mounted and wired.
See Figure 9. On vertical furred-in units, the switch may
be shipped separately on a decorative wall plate for field
mounting and wiring. See Figure 10. The standard fan switch
has LOW, MEDIUM, HIGH and OFF positions plus an auxiliary
contact to energize thermostats, valves, dampers, etc.
NOTE: Wiring diagrams are for typical applications. If other
voltages for heaters or controls are specified, wiring may
differ from that shown. Refer to wiring diagram on unit
blower housing or inside control box cover for unit specific
wiring.
Thermostatic Electric Valve Control, 2-Pipe — A
thermostatically controlled 2-position valve provides
superior control to fan cycling. With this control, the fan
runs continuously unless it is manually switched to the OFF
or AUTO position. The fan must be on before the valve can
be opened to supply water to the coil. This system can be
used for normal 2-pipe changeover systems and can also be
furnished for cooling-only or heating-only applications by
omitting the changeover and specifying which application
is intended. See Figure 11 for line voltage control and
Figure 12 for 24 V control. Wiring diagrams show typical
applications. Refer to the wiring diagram on each unit
blower housing for unit specific wiring.
Thermostatic 2-Pipe Auxiliary Electric Heat with Valve
Control — This system, also called twilight or intermediate
season electric heat, goes a long way towards solving the
spring and fall control problems of 2-pipe systems. Chilled
water can be run late into the fall, turned on early in the
spring and electric heat will still be available to all units
whenever required. In winter, the system is switched over to
hot water. Two changeover devices are required for this. One
device switches the action of the thermostat and the other
locks out the electric heat when hot water is in the coil.
With this system, the fan runs continuously unless manually
switched to OFF or AUTO position. Fan must be on before
thermostat can send signal to open chilled water valve or
turn on electric heater.
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