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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
Figure 9
and also
Table 5
). Refer to the
unit nameplate to determine the number of power connections.
NOTE:
To wire entry points, refer to certified drawings for
dimensions .
Table 5: Recommended Field Power Wiring
Ampacity (MCA)
Number of Power
Wires Per Phase
Wire Gauge
Insulation
Temperature
Rating (°C)
20
1
14
75
25
1
12
75
35
1
10
75
50
1
8
75
65
1
6
75
85
1
4
75
100
1
3
75
115
1
2
75
130
1
1
75
150
1
1/0
75
175
1
2/0
75
200
1
3/0
75
230
1
4/0
75
255
1
250
75
NOTE:
1. All wire sizes assume separate conduit for each set of parallel conductors.
2. All wire sizes based on NEC Table 310-16 for 75°C THW wire (copper). Canadian
electrical code wire ampacities may vary.
3. All wire sizes assume no voltage drop for short power leads.
IM 1125-7 • REBEL ROOFTOPS
16
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Summary of Contents for DPS005
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