4
803161 Rev. 01
account any distance from fuse box or breaker panel to
receptacle to prevent excessive voltage drop in
undersized wires.
IMPORTANT:
Low voltage to the unit will cause
compressor starting problems and decrease the
performance and reliability of the compressor.
BRANCH CIRCUIT PROTECTION
The Current Rating of branch circuit protection using a
Time Delay Fuse or HACR circuit breaker should also
be as declared on the unit Rating Plate for the specific
chassis being installed.
PLUG AND RECEPTACLE
230-208 Volt units are furnished with either a NEMA
6-15P, NEMA 6-20P, or NEMA 6-30P, non-locking
plug depending on the unit ampacity, and hence will
require the corresponding NEMA receptacle to be
field-provided. The 30 Amp LCDI plug head is too
large to fit through the hole provided in the existing
installed wall sleeve. In that case break out the larger
rectangular knock-out in the sleeve bottom and discard.
Install the rectangular adapter plate, which is supplied
with every unit using a 30 Amp plug, as shown below.
All 115 Volt units are furnished with a NEMA 5-15P,
or 5-20P non-locking plug as applicable. The
respective plug will require a NEMA 5-15R or 5-20R
receptacle to be field-provided.
All 277 Volt units are furnished with a NEMA 7-20P,
20 Amp non-locking plug and hence will require a
NEMA 7-20R receptacle to be field-provided.
NOTE:
277 Volt units are considered to be
permanently connected per the National Electrical
Code. The plug and cord are considered to be a
“connector of convenience” in order to facilitate easy
removal of the chassis for servicing. The plug and cord
are suitably protected when using the non-optional 277
volt sub-base.
230-208 and 115 volt units are true “cord connected
units”, and are provided with a service cord of the
LCDI (Leakage Current Detection Interrupter) type,
intended to be plugged in to a wall receptacle. The
LCDI cord is capable of detecting some of the common
faults experienced with aging power cords, and when
those faults are detected, interrupts power to the cord
before a hazardous condition can evolve. The LCDI
service cord, with its bulky plug head and inherent
mechanical protection, is not intended to be plugged
into a receptacle in a subbase.
WARNING:
To avoid property damage, bodily injury
or death, the unit must be used on a grounded power
supply only. The unit will be grounded through the
service cord plug and matching receptacle as long as
the branch circuit remains grounded.
DO NOT:
Change the length of the service cord.
Bend the connector blades or otherwise alter
service cord plug configuration.
Use extension cords.
CHASSIS INSTALLATION
Unpack heat/cool chassis from shipping carton.
Check for any shipping damage. Spin the fan wheels
manually to confirm free rotation. Inspect refrigerant
piping to ensure there is no damage. Report any
shipping damage to the carrier immediately.
Check the interior of the installed wall sleeve. Clean
out any dirt or debris that may have accumulated.
Replace air seals that are damaged or missing.
