3
amount of heat absorbed from the outside air. So, to maintain
energy--efficient operation, your unit has an automatic defrost
mode.
The defrost mode starts at a preset time interval of 60 minutes,
although, it may be reset to 30, 90 or 120 minutes. Defrost will
start at the preset time only if the ice is sufficient to interfere with
normal heating operation.
After the ice is melted from the coil, or after a maximum of 10
minutes in defrost mode, the unit automatically switches back to
normal heating operation.
Do not be alarmed if steam or fog appears at the outdoor unit
during defrost mode. Water vapor from the melting ice may
condense into a mist in the cold outside air.
During certain weather conditions such as heavy snow and freezing
rain it is not uncommon for ice to build up on the unit grille. This
is normal for these weather conditions. Do not attempt to remove
the ice from the unit grille. This condition will not affect the proper
function of the unit and will clear within a few days.
Emergency Heating Mode
In the event of primary unit heat failure, the emergency heat mode
allows your supplemental heating source to keep your home or
office warm until your unit can be serviced. Contact your dealer in
the event of primary unit heat failure.
MAINTENANCE AND SERVICE
This section discusses maintenance that should be performed by
your dealer and care you, as the owner, may wish to handle for
your new unit.
Routine Maintenance
All routine maintenance should be handled by skilled, experienced
personnel. Your dealer can help you establish a standard procedure.
To assure proper functioning of the unit, flow of condenser air
must not be obstructed from reaching the unit. Clearance from the
top of the unit is 48 in. (1219 mm). Clearance of at least 36 in.
(914 mm) is required on sides except the power entry side (42 in.
[1067 mm] clearance) and the duct side (12
in. [305 mm]
minimum clearance).
Maintenance and Care for the Equipment Owner
Before proceeding with those things you might want to maintain
yourself, please carefully consider the following:
FIRE, EXPLOSION, ELECTRICAL SHOCK, CUT
HAZARD
Failure to follow this warning could result in personal
injury, death or property damage.
1. TURN OFF ELECTRICAL POWER TO YOUR UNIT
BEFORE
SERVICING
OR
PERFORMING
MAINTENANCE AND INSTALL A LOCK--OUT
TAG. THERE MAY BE MORE THAN ONE DISCON-
NECT SWITCH.
2. When
removing
access
panels
or
performing
maintenance functions inside your unit, be aware of
sharp sheet metal parts and screws. Although special care
is taken to reduce sharp edges to a minimum, be
extremely careful when handling parts or reaching into
the unit.
!
WARNING
Air Filters
The air filter(s) should be checked every 3 or 4 weeks and changed
or cleaned whenever it becomes dirty. Dirty filters produce
excessive stress on the blower motor and can cause the motor to
overheat and shut down.
This unit must have an air filter in place before it can be operated.
These filters should be located in at least one of two places. In
many applications, the installer will provide return air filter grilles
mounted on the wall or ceiling of the conditioned structure. In the
instance of filter grilles, the filters can simply be removed from the
grille and replaced.
The other typical application is an accessory filter rack installed
inside the unit itself. The following information is given to assist in
changing filters used in these internal filter racks.
Filter kits are available as a purchased accessory or a factory
installed option. The same filter kit is included with the accessory
economizers and factory installed economizers.
Table 1 – Replacement Filter Sizes
50EZ Unit Size
Filter Size
24
2 each 20 x 12 x 1
(508 x 305 x 25 mm)
30---36
2 each 20 x 12 x 1
(508 x 305 x 25 mm)
42-48
1 each 24 x 14 x 1 (610 x 356 x 25 mm),
24 x 16 x 1 (610 x 406 x 25 mm)
60*
1 each 24 x 16 x 1 (610 x 406 x 25 mm),
24 x 18 x 1 (610 x 457 x 25 mm)
*Units with bent indoor coil.
50VT Unit Size
Filter Size
24
2 each 20 x 12 x 1
(508 x 305 x 25 mm)
30
2 each 20 x 12 x 1
(508 x 305 x 25 mm)
36-42
1 each 24 x 14 x 1 (610 x 356 x 25 mm),
24 x 16 x 1 (610 x 406 x 25 mm)
48---60*
1 each 24 x 16 x 1 (610 x 406 x 25 mm),
24 x 18 x 1 (610 x 457 x 25 mm)
*Units with bent indoor coil.
To replace or inspect filters in accessory filter rack:
1. Remove the filter access panel (See Fig. 3) using a 5/16--in.
nut driver.
2. Remove the filter(s) by pulling it out of the unit. If the
filter(s) is dirty, clean or replace with a new one.
When installing the new filter(s), note the direction of the airflow
arrows on the filter frame.
If you have difficulty locating your air filter(s) or have questions
concerning proper filter maintenance, contact your dealer for
instructions. When replacing filters, always use the same size and
type of filter that was supplied originally by the installer. See Table
1 for filter sizes supplied with accessory filter rack.
Access Panels
Filter Access Panel
For Accessory Filter Rack
A09044
Fig. 2 -- Accessory Filter Rack Access Panel
