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Pre-Construction
The Rebel unit comes equipped with a Microtech III controller
and can be used for sites that are still under construction. The
following conditions must be met.
1 .
Ductwork has to be installed. The fan proving switch
and furnace might not run correctly without the specified
external static pressure
2 . Filters must be installed .
3 .
Follow furnace commissioning instructions found in the
furnace section.
4 .
After substantial completion of the construction process
the unit is to be thoroughly cleaned. Special attention
should be paid to the indoor DX coil and the furnace.
Filters should be changed
5 .
Furnace operation, rate, and temperature rise should be
re-verified. See instructions found in the furnace section.
Lab Pressurization Applications
1 .
Install a “T” fitting with a leak-tight removable cap in each
tube near the sensor fitting. This facilitates connecting a
manometer or pressure gauge if testing is required.
2 .
Use different colored tubing for the controlled space
pressure (high) and reference pressure (low) taps, or tag
the tubes.
3 .
Regardless whether the controlled space is positive or
negative with respect to its reference, locate the high
pressure tap in the controlled space (the setpoint can be
set between -0.2" and 0.2" wc).
4 .
Locate the reference pressure (low) tap in the area
surrounding the controlled space. Not locating the
reference tap to the sensor results in unsatisfactory
operation .
5 .
Locate both taps so they are not influenced by any source
of moving air (velocity pressure). These sources may
include air diffusers or doors between the high and low
pressure areas .
6 .
Route the building tap tube between the curb and the
supply duct and feed it into the unit through the knockout
in the bottom of the control panel.
7 .
Connect the tube to the (high) fitting for sensor SPS2.
Electrostatic Discharge (ESD)
Disconnect Power to the Rebel Rooftop Unit prior to
inspecting and/or repairing .
When inspecting / repairing Rebel Rooftop units the technician
or building owner must take precautions to ground themselves to
the unit. This will prevent them from damaging the circuit boards
mounted inside the inverter box and main control panel.
Electrostatic Discharge (ESD) can damage components in a
manner that is not always readably detectable. A static potential
can easily be generated on a person that reaches 25 kVolts. If
this potential is discharged into one of the unit’s circuit boards it
can degrade part of the current carrying conductors inside. This
is the conceptual equivalent of reducing 16 gage wires to 18.
The component will still operate initially, but will have a much
shorter life span due to overheating of the conductor.
In order to prevent ESD from the technician to the unit they must
both be at the same potential. First the technician must ground
themselves to the unit; this can be achieved by touching any
galvanized (not painted) section of the unit. The unit’s base
rail and refrigerant piping are both reliable options. The next
step is to attach a grounded wrist or ankle strap to the copper
tubing. This grounding strap must have direct contact with the
technician’s skin. Once this has been done the technician is free
to work on electrical components in side the unit.
Although ESD is partially dependent on humidity, at levels above
50% it is a greatly reduced risk, good practices should always be
observed.
All Units
Wiring must comply with all applicable codes and ordinances.
The warranty is voided if wiring is not in accordance with these
specifications.
According to the National Electrical Code, a disconnecting
means shall be located within sight of and readily accessible
from the air conditioning equipment. The unit can be ordered
with an optional factory mounted disconnect switch. This switch
is not fused. Power leads must be over-current protected at the
point of distribution. The maximum rated overcurrent protection
device (MROPD) value appears on the unit nameplate.
All units are provided with internal power wiring for single point
power connection. The power block or an optional disconnect
switch is located within the main control panel. Field power
leads are brought into the unit through knockouts in the bottom
of the main control panel (see
).
Refer to the unit nameplate to determine the number of power
connections.
NOTE:
To wire entry points, refer to certified drawings for
dimensions .
DANGER
Hazardous voltage . Can cause severe injury or
death .
Disconnect electric power before servicing equipment.
More than one disconnect may be required to de-
energize the unit.
IM 1125-6 • REBEL ROOFTOPS 12
www.DaikinApplied.com
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DOT-ITB-21-8041-AC
FPID: 437300-3-7B-01
