AAON F1-060, Installation, Operation & Maintenance Manual, Page: 17 / 56

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8. Pull and install power wires per wiring
diagram and MCA, MOP information
herein and secure all wires firmly
9. Replace the front control panel(s) of the
unit
FIELD INSTALLED WIRES SHOULD BE
SINGLE STRAND WIRES. USE OF
ROMEX WIRES IS NOT ACCEPTABLE.
Heating
is accomplished by passing
electrical current through a specified amount
of resistance heaters, which will produce the
required heat. The indoor blower motor will
energize at the same time as the heaters.
Wiring to the air handling unit must be done
in accordance with local electrical codes
and/or standards. Check specified electrical
rating and install with proper wire sizes.
Also refer to wiring diagrams included with
the unit for wire sizes and circuit breaker
recommendations.
Field Wiring - MCA and MOP
Minimum Circuit Ampacity (MCA) and
Maximum Overcurrent Protection (MOP)
are necessary to correctly connect field
wired equipment.
The calculations for the MCA and MOP are
based on requirements of NFPA 70, the
National Electrical Code (NEC) and CSA
C22.1, the Canadian Electrical Code (CEC).
The MCA is the minimum wire size needed
to prevent the wiring from overheating
during operating conditions for the life of
the product. The MOP is the maximum
allowable circuit breaker size that will
properly disconnect power to the equipment
under anticipated fault conditions.
In the following tables, locate the kW of the
heater to be field installed, and then choose
the corresponding MCA and MOP values to
correctly size the wire gauge(s) and circuit
breaker(s), respectively.
Table 1 - Electric Heat Minimum Circuit
Ampacity
230V 208V
Line
1
Line
2
Line
3
kW kW MCA MCA MCA
5 3.75 26.0
10 7.50 52.1
15 11.25 52.1 26.0
20 15.00 52.1 52.1
25 18.75 52.1 52.1 26.0
Overcurrent protection less than that
recommended on the unit's "Specification
Sheet" could result in unnecessary fuse
failure and service call. The manufacturer
bears no responsibility for damage caused to
the equipment as a result of not using the
recommended size for the protective devices
as listed on the unit's rating plate.
Table 2 - Electric Heat Maximum
Overcurrent Protection
230V 208V Line
1
Line
2
Line
3
kW kW MOP MOP MOP
5 3.75 30
10 7.50 60
15 11.25 60 30
20 15.00 60 60
25 18.75 60 60 30
Heat Pump
For heat pump equipped split system
configurations, the heat pump is the primary
heat source during a call for heat. During
operation at low ambient temperatures
where the heat pump alone cannot satisfy
the space temperature set point, electric
resistance heat elements are activated.
Below about 17°F, only the electric heat is
operable; the heat pump is not active.