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Field Power Wiring
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
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 .
WARNING
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.
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
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.
CAUTION
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.
A ground lug is provided in the control panel. Size the
grounding conductor in accordance with Table 250-95 of the
In compliance with the
, 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 a 7/8" knockout
in the bottom of the main control panel.
Table 14: Recommended Field Power Wiring
Ampacity (MCA)
No . 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
300
2
1/0
75
350
2
2/0
75
400
2
3/0
75
460
2
4/0
75
510
2
250
75
600
3
3/0
75
690
3
4/0
75
765
3
250
75
Notes:
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).
wire ampacities may vary.
3. All wire sizes assume no voltage drop for short power leads.
Figure 17: MPS Power Wiring Knockout Locations
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19
IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS
