Installation
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IM 782-12 • DESTINY AIR HANDLERS
Field Power Wiring
DANGER
Improper ground may result in severe injury or death .
Check grounding nut tightness before connecting power to the external
junction box.
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.
Wiring must comply with all applicable codes and ordinances.
The warranty is voided if wiring is not in accordance with
these specifications. An open fuse or starter indicates a short,
ground, or overload. Before replacing a fuse or resetting a
starter, identify the trouble and correct.
According to the
means shall be located within sight of and readily accessible
from the air conditioning equipment. Power leads must
be over-current protected at the point of distribution. The
maximum allowable overcurrent protection (MROPD) appears
on the unit nameplate.
Supply Power Wiring
1. Allowable voltage tolerances:
a. 60 Hertz
– Nameplate 208V: Min. 187V, Max. 229V
– Nameplate 230V: Min. 207V, Max. 253V
– Nameplate 460V: Min. 414V, Max. 506V
– Nameplate 575V: Min. 518V, Max. 633V
b. 50 Hertz
– Nameplate 380V: Min. 360V, Max. 418V
2. Minimum Circuit Ampacity (MCA) Calculation is based on
the following formulas:
– Electric heat less than or equal to 50 kW
MCA = 1.25 (heater FLA + largest motor loads) +
(the rest of the loads)
– Electric heat greater than or equal to 50 kW
MCA = 1.25 (largest motor load) + (the rest of the
loads) + heater FLA
3. Size wires in accordance with Table 310-16 or 310-19 of
the National Electrical Code.
4. MROPD is calculated per UL 1995 methodology.
5. Wires should be sized for a maximum of 3% voltage drop.
Electrical Installation
1. Electrical service to the fan must correspond to the rated
voltage on the motor nameplate and be in conformance
with the
and local restrictions.
2. The fan section metal frame must be connected to the
building electrical ground.
3. A door electrical interlock is not provided as standard
4. Thermal motor protection is external to the unit. Unless
the unit is provided with a unit mounted starter, thermal
protection and a disconnect switch provision per electric
codes are provided by others.
5. When the unit is factory provided with a junction box,
disconnect switch, starter, or a variable frequency drive
(VFD), the components are mounted on the outside
of the unit cabinet. Factory wiring is provided from the
device to the unit internal motor.
