Rheem RKKB SERIES Owner's Manual page 59

Powered Exhaust—The field installed
powered exhaust, available for all units,
shall provide exhaust of return air, when
using an economizer, to maintain better
building pressurization.
Through the Base Electrical Access—An
electrical service entrance shall be factory
provided allowing electrical access for both
control and main power connection inside
the curb and through the base of the unit.
Option will allow for field installation of
liquid-tight conduit and an external field-
installed disconnect switch.
Through the Base Electrical with Dis-
connect Switch—Factory-installed 3-pole,
molded case disconnect switch with provi-
sions for through the base electrical con-
nections are available. The disconnect
switch will be installed in the unit in a water-
tight enclosure with access through a
hinged door. Factory wiring will be provided
from the switch to the unit high voltage
terminal block. The switch will be UL/CSA
agency recognized. Note: The disconnect
switch will be sized per NEC and UL guide-
lines but will not be used in place of unit
over current protection.
Unpowered Convenience—This factory-
installed option is a GFCI, 120v/15amp, 2
plug, and convenience outlet, unpowered.
When the convenience outlet is powered, a
service receptacle disconnect will be avail-
able. The convenience outlet is powered
from the line side of the disconnect or
circuit breaker, and therefore will not be
affected by the position of the disconnect or
circuit breaker. This option can only be
ordered with the Disconnect Switch.
Through the Base Gas Piping—The unit
shall include a standard through the base
gas provision.
Freeze/Clogged Filter Switches—This
factory or field-installed option allows for
individual fan failure or dirty filter protection.
If indoor coil gets too cold due to low air-
flow, compressor operation will be tem-
porarily interrupted.
Enthalpy Control—Single Enthalpy Con-
trol shall be standard for all economizers.
Enthalpy control offers a higher level of
comfort control, along with energy savings
potential, than the standard dry bulb con-
trol. This is due to the additional wet bulb
sensing capability.
MECHANICAL SPECIFICATIONS—RKKB/RKMB/RKNB- SERIES
High Pressure Cutout—This factory or
field installed option is offered for units that
do not have high pressure cutout as stan-
dard. All scroll compressors shall include
Internal Pressure Relief as standard.
Hinged Access Doors—Stainless steel
metal hinges are standard on the
Filter/Electrical Access Door and Heat
Exchanger door.
Thermostats—Two stage heating and
cooling operation shall be available, for
field installation, in either manual or auto-
matic changeover. Automatic programma-
ble electronic with night set back shall also
be available.
Differential Enthalpy—Adds on to the
standard single control with other enthalpy
sensors that compare total heat content of
the indoor air and outdoor air to determine
the most efficient air source. This control
option offers the highest level of comfort
control, plus energy efficiency available.
Low Ambient Cooling—Electromechani-
cal models have cooling capabilities to
40°F as built, or to 0°F by adding the
optional low ambient (frostat) control.
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