The preferred entrance for power cables is through the bottom
knockouts provided on the unit. If a side entrance is the only
option, a hole may be drilled in the stationary upright.
The minimum circuit ampacity (MCA) is shown on the unit
nameplate . Refer to
for the recommended number of
power wires.
Copper wire is required for all conductors. Size wires in
accordance with the ampacity tables in Article 310 of the
National Electrical Code. If long wires are required, it may be
necessary to increase the wire size to prevent excessive voltage
drop. Wires should be sized for a maximum of 3% voltage drop.
Supply voltage must not vary by more than 10% of nameplate.
Phase voltage imbalance must not exceed 2%. (Calculate the
average voltage of the three legs. The leg with voltage deviating
the farthest from the average value must not be more than
2% away.) Contact the local power company for correction of
improper voltage or phase imbalance.
A ground lug is provided in the control panel. Size the grounding
conductor in accordance with Table 250-95 of the National
Electrical Code.
In compliance with the National Electrical Code, a 115 V factory
mounted service receptacle outlet is provided. This outlet must
be powered by a field connected 15 A, 115 V power supply.
Leads are brought into the unit through the bottom of the main
control panel.
Table 7: Recommended Field Power Wiring
Field Control Wiring
The Rebel rooftop units are available with the following field
control connections:
•
Space sensor.
•
Space sensor with setpoint adjustment.
• Fan operation output .
•
VAV box output.
• Remote alarm output .
•
External discharge air temperature reset.
•
Outdoor air damper minimum position adjustment.
Descriptions of these field connections are included in the
MicroTech III Unit Controller Manual (OM 1141).
Start-up and service of this equipment must be performed
by trained and experienced technicians .
It is highly
recommended that the initial start-up and future service be
performed by Daikin trained technicians who are familiar with
working on live equipment. A representative of the owner or the
operator of the equipment should be present during start-up to
receive instructions in the operation, care and adjustment of the
unit .
Before Start-Up
1 .
Notify inspectors or representatives who may be required to
be present during start-up of gas fuel equipment. These could
include the gas utility company, city gas inspectors, heating
inspectors, etc.
2 .
Review the equipment and service literature and become
familiar with the location and purpose of the furnace controls.
Determine where the gas and power can be turned off at the
unit and before the unit.
3 .
Determine that power is connected to the unit and available.
4 .
Determine that the gas piping, meter, and service regulator
have been installed, tested, and meet the equipment
requirements .
5 .
Determine that proper instruments will be available for the
start-up. A proper start-up requires the following: voltmeter,
manometer or gauges with ranges for both manifold pressure
and inlet gas pressure.
WARNING
Provide proper line voltage and phase balance .
Improper line voltage or excessive phase imbalance
constitutes product abuse. It can cause severe damage
to the unit’s electrical components.
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.
WARNING
Electrical shock hazard . Can cause severe injury or
death
.
Connect only low voltage NEC Class II circuits to
terminal block TB2.
DANGER
Overheating or failure of the gas supply to shut off can
cause equipment damage, severe personal injury or
death .
Turn off the manual gas valve to the appliance before
shutting off the electrical supply.
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www.DaikinApplied.com
13
IM 1125-6 • REBEL ROOFTOPS
DOT-ITB-21-8041-AC
FPID: 437300-3-7B-01
