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Marvair Classic AVHA Heat Pump I&O Manual
08/2018 Rev. 2
Your equipment is covered by a LIMITED WARRANTY against
defects in material and workmanship.
This is a vertical, wallmount unit designed for many different
applications in both residential and commercial settings. It is
self-contained and arrives completely assembled, factory-
charged and wired. The unit is 100% run-tested at the factory
to ensure proper operation. Your unit is supplied with high-
quality copper tubing and enhanced aluminum-finned coils for
high heat transfer efficiency and long life. The unit cabinet is
constructed of G-90 galvanized steel. All exterior surfaces are
finished with a baked-on polyester coating. This will provide
excellent corrosion protection in most applications. However,
if the unit is installed in an area with a corrosive atmosphere,
such as near an industrial plant or on the seacoast, additional
coating should be considered to extend the life of the coils
and cabinet.
This unit was designed for up to 105ºF of ambient temperature
for the cooling mode; for heating mode, this unit was designed
for up to 78ºF of room temperature and minimum 15ºF ambient
temperature.
INSPECTION AND UNPACKING
A thorough inspection of the shipping container should
be made immediately upon receiving your unit. Look for
any punctures or openings. If it appears as if damage has
occurred, it should be noted on the freight bill before signing.
The delivering carrier should be contacted immediately to
inspect damage, and no installation work should begin until
this inspection is completed.
DANGER
BEFORE PERFORMING ANY WORK ON THIS EQUIPMENT,
POWER SUPPLY MUST BE TURNED OFF AT THE HOUSEHOLD
SERVICE BOX TO AVOID THE POSSIBILITY OF SHOCK,
INJURY, DEATH, OR DAMAGE TO EQUIPMENT.
SAFETY RULES
WARNING
FAILURE TO FOLLOW THESE RULES AND INSTRUCTIONS
COULD CAUSE A MALFUNCTION DESTRUCTION OF
EQUIPMENT WHICH COULD RESULT IN PROPERTY DAMAGE,
SERIOUS BODILY INJURY, OR DEATH.
1. Installation and repair MUST be done by a qualified person.
The equipment should be inspected before use and at least
once annually by a professional service person.
2.
AVOID ELECTRICAL SHOCK!
Turn power OFF when
servicing. There may be more than one disconnect switch
to de-energize unit.
3. Close cover(s) before returning breaker(s) to “ON” position.
4. Please observe good safety practices by wearing personal
protective equipment such as gloves and safety glasses
to avoid injury.
5. Installation MUST conform to local codes. In the absence
of local codes, refer to the National Electrical Code (NEC),
ANS/NFPA No. 70-1993 and recommendations made by
the National Board of Fire Underwriters.
In all cases, the equipment MUST be installed in accordance
with the installation instructions described in this manual.
WARNING
IMPROPER INSTALLATION MAY DAMAGE EQUIPMENT, CAN
CREATE HAZARD, AND WILL VOID THE WARRANTY
OPERATING INSTRUCTIONS
If heating and cooling functions are controlled by separate
thermostats, turn the furnace thermostat to the “OFF” position
during the cooling season to prevent simultaneous operation
of the heating and cooling systems. Reverse the procedure
during the heating season.
If the same thermostat controls both heating and cooling
functions, set the thermostat to either HEAT or COOL as
desired.
Set the desired temperature on your thermostat and set
the fan switch to “ON” (for continuous air circulation) or to
“AUTOMATIC” (for air circulation only when the heat pump
system is operating).
IMPORTANT
Wait at least three (3) minutes after turning the air conditioner
off before trying to restart. If an attempt is made to start the
compressor before the refrigerant pressures are equalized,
the compressor motor may trip on its overload. An additional
waiting period will be required before restarting.
MAINTENANCE
1. Always install and keep filters clean. Check filters every 2
weeks. Clean or replace if necessary. The factory-installed
filter is located behind the center front access panel.
TO CHANGE SYSTEM FILTER:
A. Turn the power to the unit off at the unit disconnect. The
disconnect is located on the front of the unit behind a
small access door.
B. Remove the front center access door from the unit.
C. Remove and replace the filter with the type and size
indicated in the table below.
D. Replace the access door and turn on the power to the unit
NOTE:
If your system has a filter grille installed in the return
air opening, the unit filter should have been discarded during
installation.
The filter installed into the return air grille assembly should be
replaced with the same size and type provided with the grille.
If your system is equipped with a fresh air intake, the filter for
the fresh air assembly is accessed through the front center
panel. The filter is a permanent washable type.
Unit Model QTY
Filter Size - In (mm)
Type
36
1
16 x 30 x 1 (406 x 762 x 25) (Standard) Disposable
36
1
16 x 30 x 2 (406 x 762 x 51) (Optional) Pleated
42,48,60
1
20 x 30 x 1 (508 x 762 x 25) (Standard) Disposable
42,48,60
1
20 x 30 x 2 (508 x 762 x 51) (Optional) Pleated
WARNING
SERIOUS INJURY MAY RESULT IF WATER SPRAY IS
DIRECTED TOWARD LIVE ELECTRICAL CONNECTIONS OR
POWER SOURCE.
