Wall Mounted Air Conditioner and Heat Pump Accessories and Options
Marvair offers a wide range of accessories and optional features for each model line. Not all features are available for each unit, and some models offer options which are unique to that model. Refer to the appropriate Product Data Sheet for a list of the options and accessories available for each unit.
GreenWheel® Energy Recovery Ventilator
The Marvair® GreenWheel® ERV is a total energy
(both sensible and latent) wheel that reduces both construction and
operating cost while ventilating the classroom to ASHRAE 62-1999
requirements. The use of the GreenWheel ERV reduces the energy load of
the outside air. Exhausting stale, inside air keeps indoor pollutants
and harmful gases to a minimum. The Marvair GreenWheel ERV has been
tested and certified according to ARI Standard 1060.
GreenCube® Energy Recovery Ventilator
The Marvair® GreenCube® ERV is an enthalpy plate heat
exchanger that transfers both sensible and latent energies between
outgoing and incoming air streams in a cross flow arrangement. Except
for two air movers, it has no moving parts. The media is impregnated
with a RC134 polymeric desiccant that exchanges water by direct vapor
transfer using molecular transport without the need of condensation.
Factory Installed Economizer
When cool and dry, the economizer uses outside air to cool the shelter. The full flow economizer provides the same air flow in the economizer mode as in mechanical cooling. The economizer provides temperature control, energy cost savings, and increased reliability by decreasing the operating hours of the compressor and the condenser fan.
Factory and field installed accessories can be used to meet specific requirements.
Field Installed Economizer
When cool and dry, the economizer uses outside air to cool
the shelter. The full flow economizer provides the same air flow in the
economizer mode as in mechanical cooling. The economizer provides
temperature control, energy cost savings, and increased reliability by
decreasing the operating hours of the compressor and the condenser fan.
The field installed economizer is designed to retrofit economizer function to Marvair units not originally equipped with a factory installed economizer.
External Low Noise Blower (ELNB)
The External Low Noise Blower (ELNB) kit consists of a field installed condenser air hood, controls, and compressor blanket that can reduce the sound levels of selected Marvair™ ComPac™ air conditioners. The ELNB kit is built in two sizes for use on Marvair air conditioners, models AVP30- 60.
Marvair air conditioners and heat pumps are available in five different cabinet colors - the standard Marvair beige, white, gray, brown and dark bronze. The standard cabinet’s sides, top and front panels are constructed of 20 gauge painted steel. As an option, these panels can be built of 16 gauge steel in beige & gray or .050 stucco aluminum. When the 16 gauge painted steel or the aluminum is used, only the side, top and front panels are 16 gauge or aluminum. Contact your Marvair representative for color chips.
The cabinet can also be constructed of type 316 stainless steel. Two stainless steel cabinet constructions are available - the complete cabinet, including most internal sheet metal or only the exterior sheet metal.
Power Supply Options
Marvair offers a range of voltage options and single or three-phase operation.
Electric Heat Options
An electric heat option is available for Marvair air conditioners and heat pumps to supplement, where required, the heat pump cycle. Heating options vary by model. Each model's Product Data Sheet lists its available heating options.
Hard Start Kit
on single phase equipment to give the compressor higher starting torque
under low voltage conditions. (Field installed only) (Note: Not
recommended for use on scroll compressors.)
Allows the electric heat to operate
simultaneously with cooling. Note: The electrical characteristics and requirements of
air conditioners with the dehumidification option are different from
standard air conditioners. Refer to the appropriate Summary Rating
Charts for the electrical characteristics of units with Electric Reheat. Units with reheat require a
thermostat and a dehumidistat for proper operation.
Protective Coating Packages
corrosion protection packages are offered- one for the condenser section
and the other for the entire unit (the Coat-All Package).
The condenser protection package includes:
- Corrosion resistant fasteners
- Sealed or partially sealed condenser fan motor
- Protective covering applied to all exposed internal copper and metal in the condenser section
- A protective covering on the condenser coil
Coat-all package includes all of the above but also includes a
protective coating on the evaporator coil and the protective covering on
all exterior and interior components and sheet metal.
Note: the internal sheet metal which is insulated and the internal control box are not coated.
The ComPac AVPA12 is available with the protective coatings and corrosion
resistant fasteners, but does not have a sealed condenser fan motor.
Protective Coil Coatings
the condenser or evaporator coil can be coated. For harsh conditions, e.g., power
plants, paper mills or sites were the unit will be exposed to salt
water, the coil should be coated. Note: Cooling capacity may be reduced
by up to 5% on units with coated coils.
ComPac® II Air Conditioner Transition Curb
II A/C only – A sheet metal curb that enables AVPA42/48/60 ComPac II
air conditioner to replace an AVPA30/36 ComPac II unit. Curb transitions
supply and return openings of the 3-1/2, 4 and 5 ton units to the
Hot Gas By-Pass
ComPac I A/C Only – Used in
specialty applications; i.e., Magnetic Resonance Imaging (MRI)
buildings, to prevent magnetic voltage disturbance caused by compressor
cycling. Hot gas by-pass option packages are available to allow
operation to 20°F (-7°C). Please refer to Hot Gas By-pass Application
Bulletin for details. Not available on the AVPA12, 20 & 24.
units are built with larger blowers/motors for use with higher
efficiency filters with MERV ratings of 11, 13 and 14 when tested to
ASHRAE 52.2. Units with economizers have a prefilter on the outside air.
Not available on the AVPA12. Contact your Marvair representative for
Dirty Filter Indicator
factory installed option that measures the difference in pressure
across the internal filter and illuminates a LED when the pressure
exceeds the desired difference. Not available on the AVPA12.
measures the voltage of each of the three phases. The monitor
separately senses low and high voltage, voltage unbalance including
phase loss and phase reversal. A red LED glows to indicate a fault. When
all voltages are acceptable, a green LED glows. Automatically resets
when voltages and phases are within operating tolerances.
Note: Not required on 1ø units.
Thermal Expansion Valve
Available on all ComPac air conditioners. Improves performance in hot ambient temperatures.
Sealed Condenser Fan Motors
on units to be installed in corrosive sites, e.g., near the ocean and
in deserts with blowing sand. Available on all units except the AVPA12.
Compressor Sound Jacket
To reduce sound of compressor. Available on all units except the AVPA12
Extreme Duty Package
Marvair air conditioners to operate in extremely cold and hot ambient
conditions. The Extreme Duty Kit is always factory installed and is
available on all air conditioners except for the AVPA12. ComPac I units without an economizer
will operate from 0°F to 131°F (-18° to 55°C). ComPac II units with an
economizer will operate from -40°F to 131°F (-40° to 55°C).
Extreme Duty Package includes a suction line accumulator, thermal
expansion valve (TXV), crankcase heater, hard start kit, an auto reset
high pressure switch and an outdoor thermostat and fan cycle switch. The
fan cycle control is standard on all ComPac air conditioners and
operates based upon the liquid line pressure. The outside thermostat
opens whenever the outside temperature is below 50°F (10°C) and closes
when the outside temperature is 50°F (10°C) or higher. Whenever the
temperature is below 50°F (10°C), the fan cycle switch is in the
circuit; when temperatures are 50°F (10°C) or higher, the fan cycle
switch is not in the circuit. The outdoor thermostat is used with a TXV
to prevent excessive cycling or “hunting” of the TXV.
Lockable Disconnect Access Cover Plate
The access plate to the service disconnect switch can be equipped with a lockable cover.
Desert Duty Package
standard air conditioners will operate in outside ambient temperatures
up to 120°F (48.9°C) The Desert Duty package is a factory installed
package of components and cabinet modifications to allow operation in
ambient temperatures up 131°F (55°C). Standard features of the Desert
Duty package include a thermal expansion valve and a sealed condenser
fan motor. Cabinet modifications include a slotted panel in the base pan
that improves condenser air flow and also provides access to the
compressor and condenser fan motor. To prevent sand and dust
infiltration, the electrical control box is sealed. A closed loop design
on the ComPac I unit insures that no outside air is introduced into the
shelter. Note: the ComPac II unit with the economizer may be ordered
with the Desert Duty Package. If the ComPac II air conditioner is
required with the Desert Duty Package, sand intrusion into the shelter
should be considered.
Spun aluminum construction allows cleaning of filters with water.
Hot Gas Reheat (HGR)
Hot Gas Reheat coil and controls allow the indoor humidity of the
controlled environment to be maintained at or below a certain humidity
set point. These units do not have the ability to add humidity to the
room. Dehumidification is achieved by operating mechanical cooling in
conjunction with a hot gas reheat coil.
Right & Left Side Compressor Location
air conditioners can be built with the compressor on the opposite side
to facilitate service access when two units are installed side by side.
In the AVPA20-24-30-36 & AVHA30/36, the standard location for the
compressor is on the right hand side. In the AVPA12 and the AVPA42-48-60
& AVHA42-48-60, the standard location for the compressor is on the
left hand side. In the 72, the compressor is accessed from the front of
the unit and an opposing configuration is not required.