Indoor Coil Freeze Protection (Standard)
Prevents indoor coil from freeze up in cooling mode.
•
Indoor coil freeze up can occur due to a dirty air filter,
restricted or poor air flow, low refrigerant charge or low
room or outdoor temperatures.
• This can cause compressor damage.
• Should freeze condition be detected, compressor and
outdoor fan switch off for minimum of three minutes
until freeze condition is satisfied.
• During this time the indoor fan continues to run to aid
in defrost process.
Condensate Removal (Standard)
RetroAire replacement unit, cooling operation, is designed
to eliminate condensate by slinging it onto outdoor coil.
• Condensate drains through the bulkhead to the area
near the outdoor fan.
• Unit as part of normal operation produces condensate
and collects it in the unit's base pan. It is picked up
there by the outdoor fan slinger ring and deposited onto
the condenser coil. This improves the unit’s efficiency
by maintaining reduced refrigeration system pressures.
•
Base pan has overflow notches. If too much condensate
is produced notches allow condensate to flow out of the
base pan and into the wall sleeve out of the building.
Thermostatic Drain Pan Valve (Standard On
Heat Pump Units)
Heat pump models (PTHP), condensate can accumulate in
the outdoor drain pan during heat pump cycle.
• PTHP units include a thermostatic drain valve that opens
when outdoor temperatures fall below 60°F (15°C).
•
When drain valve opens, condensate flows from the
drain pan onto the bottom of the wall sleeve, and drains
to the outside.
• Keeping the base pan free of condensate water, which
could freeze during colder outdoor temperatures.
Random Start Feature (Standard)
Random start feature is initiated on initial power-up or
after a power interruption.
• Controller adds a random time delay (from 5–120
seconds) on start-up, preventing compressor from
starting.
• This staggers the start of multiple units in a single
facility, preventing a large surge if all units started at
the same time.
Anti-Short Cycle Timer (Standard)
Microprocessor control uses this timing to prevent
compressor short-cycling.
• When the compressor cycles off on heating or cooling
call, controller starts a 180-second timer.
• Compressor is not allowed to start until this time has
elapsed.
• On initial power-up or after a power failure, this timing
occurs after the random start timing.
Power Cord With Integral Safety Protection
(Standard)
All PTAC/PTHP units rated 250V or less are equipped with
power cord with integral safety protection as standard.
• Providing personal shock protection as well as arcing
and fire prevention. Device is designed to sense any
damage in line cord and disconnect power before a fire
can occur.
• Tested in accordance with Underwriters Laboratories,
cord set offers a unique “passive” operation, meaning
unit does not require resetting if main power is
interrupted.
Heat Pump
• Heat pump units are “Limited Range” and should be
equipped with back-up electric resistance or hydronic
heat.
• Limited Range heat pumps are designed to operate
when outdoor temperatures are between 70°F(21°C)
and 40°F(4.4°C) and with maximum indoor temperature
of 80°F(26.6°C).
• Unit is equipped with a reversing valve energized for
cooling and de-energized in heating mode.
• Electric heating or hydronic heat will operate using
onboard control logic below operating conditions of the
heat pump.
FEATURES
The Right Fit for Comfort
8
P/N 240010639, Rev. A [06/15/2014
]
