Field Power Wiring - Daikin PreciseLine Series Installation And Maintenance Manual

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 National Electrical
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
2. Minimum Circuit Ampacity (MCA) Calculation is based on
the following formulas:
Sizes 006-050:
Unit MCA = 1.25 (heater FLA + motor loads)
Sizes 060-100*:
Unit MCA = 1.25 (motor loads + transformer load)
*Electric heat equipped units have dual-source power
and MCA/MROPD is calculated separately.
Electric Heat Section MCA = 1.25 x heater FLA
3. MROPD is calculated per UL 1995 methodology.
4. Size wires in accordance with Table 310-16 or 310-19 of
the National Electrical Code.
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 National Electric Code and local restrictions.
2. The unit metal frame must be connected to the building
electrical ground and all wiring must be in conformance
with the national electric code and local restrictions.
www.DaikinApplied.com
Code, a disconnecting
NOTE: All field wiring penetrations, for both power and
controls wiring, must only be made at the factory
designated locations on the top, side, or bottom
panels. These locations are identified on the panels
with a 3/16" pilot hole, and are shown in the following
drawings.
3. To make a field wiring connection, use a hole saw
to penetrate the double wall panel at the designated
locations and install up to a 1" electrical conduit bulkhead
connector as shown below. Route the power wires
through the conduit connector to the disconnect box and
the wire to the control box inside the cabinet.
4. All units are provided with a safety disconnect switch.
Unit sizes 006 – 020 are available as single phase only
and are provided with a two pole switch. Three phase
units, sizes 030 – 050, are provided with a three pole
switch.
5. Optional factory provided over current protection is
available on all units with a maximum operating current
less than or equal to 48 amps. This protection is provided
with fuses located on the unit main power circuit. Units
with a maximum operating current greater than 48 amps
are provided with factory installed fusing on the electric
heat circuit only.
6. All field provided controllers must be powered by the unit
transformer.
7. All grounds, both AC and DC, are to be consolidated at
the unit.
8. A DC common input is not included on the unit.
Accordingly, the AC ground and DC ground are the
same. Any field provided controller must be compatible
with this.
Figure 57: Horizontal Cabinet Sizes 008-020 Field Cut
Electrical Service Entry Pilot Hole Location
A
B
Cabinet Sizes: 008, 010,
012, 016, 018 and 020
Access
Note:
Left hand unit shown, right hand unit
values same as left but opposite.
37 IM 1267-7 • PRECISELINE AIR HANDLER
Installation
Discharge
Top View
Field cut up to 1" diameter
electrical service
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