9
ELECTRICAL SYSTEM OPTIONS
Airflow Switch.
Designed to prevent system operation
unless there is proof of blower operation. A differential
pressure switch measures the air pressures at the suction
and discharge of the blower.
Clogged Filter Indicator.
Dirty or clogged filters are
indicated when the preset pressure differential across the
filters is reached. The indicator is factory installed and is
manually reset. It includes contacts for remote indication.
Convenience Outlet.
A 115V GFCI receptacle mounted in
a 2"x4" enclosure may be furnished with either a 15 amp
circuit breaker or fuse block or 15 amp fuses. Separate
115-volt power source and ground is required.
Exhaust Fan Interlock.
A relay installed in the unit control
panel is energized when the blower is to interlock the unit
with building exhaust fan(s).
Power Through the Curb.
On curb mounted downflow
units, a sleeve can be installed in the compressor section
to bring power wiring inside the curb, preventing a
separate
roof penetration. The sleeve must be sealed after
wiring is
completed with a suitable mastic to prevent water from
entering the space.
Firestat.
This control, mounted in the return air section,
de-energizes the unit when return air reaches 135°F. It is a
manual reset control.
Sure-Trip™.
This control automatically stops the unit
whenever a phase is lost, when phases are out of
sequence, or when supply voltage drops too low. Restart
is automatic with a 5-minute delay after proper power
supply conditions are restored.
DDC Controls.
A multi-function direct digital controller in
which temperature, pressure, and/or humidity sensors may
be interfaced to provide a complete operating and
monitoring system. Additional control information is
provided with the unit such as controller instructions and
unit wiring diagrams. Information can also be obtained thru
the application department at Addison, See last page for
contact information.
Figure 5
Preliminary Check
Figure 6
Summary of Contents for B
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