PHD4, WPH4: Owner’s Information Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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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:
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.
To replace or inspect filters in accessory filter rack:
1. Remove the filter access panel (See
) 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
for filter
sizes supplied with accessory filter rack.
A09044
Fig. 2 – Accessory Filter Rack Access Panel
WARNING
!
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 DISCONNECT 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.
Table 1 – Replacement Filter Sizes
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)
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)
36 & 60
*
*.Units with bent indoor coil.
1 each 24 x 16 x 1 (610 x 406 x 25 mm),
24 x 18 x 1 (610 x 457 x 25 mm)
WARNING
!
FIRE AND UNIT OPERATION HAZARD
Failure to follow this warning could result in personal injury, death or
property damage.
Never operate your unit without filters in place. An accumulation of
dust and lint on internal parts of your unit can cause loss of efficiency.
Access Panels
Filter Access Panel
For Accessory Filter Rack
