Features
Indoor coil freeze protection
(standard)
This feature will prevent the indoor coil from freeze up in the 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 in turn can cause compressor damage.
•
Should a freeze condition be detected, the compressor and outdoor
•
fan will be switched off for a minimum of three minutes until the
freeze condition is satisfied.
During this time the indoor fan will continue to run to aid in the
•
defrost process.
Condensate removal
(standard)
The RetroAire replacement unit (cooling operation) is designed to
eliminate condensate by slinging it onto the outdoor coil.
Condensate drains through the bulkhead to the area near the
•
outdoor fan.
As part of its normal operation, the unit will produce condensate
•
and collect it in the base pan of the unit. There it is picked up by
the outdoor fan slinger ring and deposited onto the condenser coil.
During the cooling season, 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 basepan and into the
wallsleeve out of the building.
Thermostatic drain pan valve
(standard on heat pump units)
On heat pump models (PTHP), condensate can accumulate in the
outdoor drain pan during the heat pump cycle.
PTHP units include a thermostatic drain valve that opens when
•
outdoor temperatures fall below 60°F (15°C).
When the drain valve opens, condensate flows from the drain pan
•
onto the bottom of the wall sleeve, where it drains to the outside.
This keeps the base pan free of condensate water, which could
•
otherwise freeze during colder outdoor temperatures.
Random start feature
(standard)
The random start feature is initiated on initial power-up or after a
power interruption.
The controller adds a random time delay (from 5–120 seconds) on
•
start-up, preventing the compressor from starting.
This staggers the starting of multiple units in a single facility,
•
preventing a large surge that might occur if all units started at the
same time.
Anti-short cycle timer
(standard)
The microprocessor control uses this timing to prevent short-cycling
of the compressor.
When the compressor cycles off on a heating or cooling call, the
•
controller starts a 180-second timer.
The compressor will not be 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 a
power cord with integral safety protection as standard.
Providing personal shock protection as well as arcing and fire
•
prevention, the device is designed to sense any damage in the line
cord and disconnect power before a fire can occur.
Tested in accordance with Underwriters Laboratories, the cord set
•
also offers a unique “passive” operation, meaning the 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 75°F(24°C) and 40°F(4.4°C) and with a maximum indoor
temperature of 80°F(26.6°C). The unit is equipped with a reversing
valve that is energized for cooling and de-energized in heating mode.
Electric heating or hydronic heat will operate using the onboard con-
trol logic below the operating conditions of the heat pump.
Hydronic heating
(optional)
An optional hydronic heat package may be selected in lieu of electric
heat. Heating operation is essentially the same as that of units with
electric heat.
Aquastat connection
(optional)
All replacement PTAC/PTHP's with hydronic heat are supplied with
a standard line volt Aquastat connection. The field installed Aquastat
delays the fan operation until the hydronic coil reaches a temperature
of
100
°F (
38
°C).
Replacement Packaged Terminal Air-Conditioning / Heat Pump
• Installation, Operation, and Maintenance Manual •
P/N 240008034, Rev. D [7/29/2011]
9
Made in USA
