IM 1287-6 • REBEL APPLIED ROOFTOP 84 www.DaikinApplied.com
Smoke and Fire Protection
DANGER
The potential risk of smoke, re, or fumes entering the unit can result in
serious injury, death, and property damage.
Daikin Applied optionally oers factory installed outdoor air,
return air, and exhaust air dampers as well as smoke detectors
in the supply and return air openings, complete with wiring and
control. These components often are used in the building’s
smoke, fume, and re protection systems. However, due to
the wide variation in building design and ambient operating
conditions into which our units are applied, we do not represent
or warrant that our products will be t and sucient for smoke,
fume, and re control purposes. The owner and a fully qualied
building designer are responsible for meeting all local and
NFPA building code requirements with respect to smoke, fume,
and re control.
Smoke Detectors
Field installed smoke detectors in the return air ductwork or
the supply air ductwork can be coordinated with the unit’s
operation through the unit controller’s binary input. This input
is wired to TB2 and the supply air smoke detector can be
wired between terminals 103 and 104 and the return air smoke
detector can be wired between terminals 104 and 105. The T2
transformer supplies 24VAC across each of these terminals
and a dry set of contacts can be wired to these terminals
respectively.
Factory installed smoke detectors have similar wiring and the
control sequence is as follows:
When smoke is detected by either sensor, the normally closed
sensor contacts open. This removes power from binary input
on the main control board.
The MicroTech controller responds by shutting down the unit.
The controller is placed in the Alarm O state and cannot
be restarted until the alarm is manually cleared. Refer to the
operation manual supplied with the unit for information on
clearing alarms.
The smoke detectors must be reset manually once they have
been tripped. Power must be cycled to the smoke detector to
reset.
Figure 154: Smoke Detector Schematic
Ventilation Override Control
An Optional ventilation override control feature provides three
contact inputs pre-wired in the unit control panel for override
control in the event of an emergency. They are all designated
on a eld wired terminal strip in the low voltage control panel.
Sequences - the ventilation control feature allows for one of
the following sequences to be performed.
NOTE: For all Sequences the Emergency OFF contact
should be open.
1. Ventilate: When the digital input for Ventilate is active,
the Outdoor air damper is opened to 100%.
2. Pressurization: When Pressurization is active, the
Outdoor air damper is opened to 100%, and the Supply
Fan Ramps to Vent Capacity. SAF Vent Capacity is
adjustable in the MicroTech under Main Menu\Advanced
Menus\SAF Set-Up\SAFVentCap
3. Purge: When Purge is active, the return damper is held
shut and the Exhaust fan ramps to Vent Capacity. RFEF
Vent Capacity is adjustable in the MicroTech under Main
Menu\Advanced Menus\RFEF Set-Up\RFEFVentCap
Emergency Shutdown
The terminals 205 & 206 on TB2 can be used for any eld
supplied component that requires a unit emergency shutdown.
When these terminals are used, the factory installed jumper
must be removed.
Freeze Protection
An optional freezestat is available on units with MicroTech
control that have hot water, chilled water, or steam heating
coils. The sensing element is located on the downstream
side of the heating coil in the heating section of the unit. If
the freezestat detects a freezing condition and closes, the
MicroTech controller takes dierent actions, depending on
whether the fans are ON or OFF. The freezestat is an auto
reset type of control; however, the controller alarm that it
causes is manually reset if the fan is on and auto reset if the
fan is OFF.
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