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O PREVENT IMPROPER A ND DANGEROUS O PERATION D UE T O WIRING ERRORS,
T
LABEL ALL WIRES PRIOR TO D ISCONNECTION W HEN SERVICING CONTROLS.
ERIFY PROPER O PERATION A FTER SERVICING.
V
For unit protection, use a time delay fuse or HACR circuit
breaker that is in excess of the circuit ampacity, but less than
or equal to the maximum overcurrent protection device. DO
NOT EXCEED THE MAXIMUM OVERCURRENT DEVICE
SIZE SHOWN ON UNIT DATA PLATE.
All line voltage connections must be made through weatherproof
fittings. All exterior power supply and ground wiring must be
in approved weatherproof conduit. Low voltage wiring from the
unit control panel to the thermostat requires coded cable. See
below for ground level and rooftop wiring.
Unit Voltage
The unit transformer is factory connected for 230V operation.
If the unit is to operate on 208V, reconnect the transformer
primary lead as shown on the unit wiring diagram.
CIRCULATING AIR AND FILTERS
Airflow Conversion
Units can easily be converted from horizontal to down-discharge
airflow delivery. In down-discharge or high static installations,
the installer should measure the total external static and
review the blower performance charts before performing the
installation. In some installations it will be necessary to change
the blower speed to provide proper air flow.
Horizontal Air Flow
Single phase models are shipped without horizontal duct covers.
If needed, these kits may be ordered through Daikin's Service
Parts department.
For 3-phase models only, remove supply and return duct covers
which are attached to the unit as shown below.
CAUTION
Remove these covers
for horizontal duct
applications
Duct Cover Installation
Down Discharge Applications
Cut insulation around bottom openings and remove panels
from the bottom of the unit, saving the screws holding the
panels in place.
NOTE: Single phase models require installation of horizontal
duct kit #20464501NGK (medium chassis) and #20464502NGK
(large chassis). See "Unit Dimensisons" section for chassis
sizes.
Ductwork
Duct systems and register sizes must be properly designed
for the C.F.M. and external static pressure rating of the
unit. Ductwork should be designed in accordance with the
recommended methods of Air Conditioning Contractors of
America Manual D (Residential) or Manual Q (Commercial). All
ductwork exposed to the outdoors must include a weatherproof
barrier and adequate insulation.
A duct system should be installed in accordance with Standards
of the National Board of Fire Underwriters for the Installation of
Air Conditioning, Warm Air Heating and Ventilating Systems.
Pamphlets No. 90A and 90B.
The supply duct from the unit through a wall may be installed
without clearance. However, minimum unit clearances as
shown in the appendix must be maintained. The supply duct
should be provided with an access panel large enough to
inspect the air chamber downstream of the heat exchanger. A
cover should be tightly attached to prevent air leaks.
For duct flange dimensions on the unit refer to the Unit
Dimension illustration in the appendix.
For down-discharge applications, the ductwork should be
attached to the roof curb prior to installing the unit. Ductwork
dimensions are shown in the roof curb installation manual.
If desired, supply and return duct connections to the unit may
be made with flexible connections to reduce possible unit
operating sound transmission.
11
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