Board Default Settings; Service; Filters; Condensate Drain Pans - Carrier Aquazone 50PTH024 Installation, Start-Up And Service Instructions Manual

Board Default Settings

The board will come from the factory with the following default
settings:
• Freeze — "Terminals not jumped" on all the time
• Temp — 30°F
• Lockout — 2
• Reset — Y
• Alarm — PULSE
• Test — NO
• Dry Contact — Normally Open (NO)

SERVICE

Perform the procedures outlined below periodically, as indicated.
An annual "checkup" is recommended by a licensed refrigeration
mechanic. Recording the performance measurements of volts,
amps, and water temperature differences (both heating and cool-
ing) is recommended. This data should be compared to the infor-
mation on the unit's data plate and the data taken at the original
start-up of the equipment.
Periodic lockouts almost always are caused by air or water flow
problems. The lockout (shutdown) of the unit is a normal protec-
tive measure in the design of the equipment. If continual lockouts
occur call a mechanic immediately and have them check for water
flow problems, water temperature problems, airflow problems or
air temperature problems. Use of the pressure and temperature
charts for the unit may be required to properly determine the
cause.
IMPORTANT: When a compressor is removed from this unit,
system refrigerant circuit oil will remain in the compressor. To
avoid leakage of compressor oil, the refrigerant lines of the com-
pressor must be sealed after it is removed.
WARNING
To avoid injury and the discharge of refrigerant into the envi-
ronment, all refrigerant discharged from this unit must be re-
covered without exception. Technicians must follow industry
accepted guidelines and all local, state and federal statutes for
the recovery and disposal of refrigerants.
WARNING
To avoid injury and the release of refrigerant into the atmo-
sphere, the refrigerant circuit of this unit must only be serviced
by technicians who meet local, state and federal proficiency
requirements.
WARNING
To prevent injury or death due to electrical shock or contact
with moving parts, open unit disconnect switch before servic-
ing unit.

Filters

Filter changes or cleanings are required at regular intervals. The
time period between filter changes will depend upon type of envi-
ronment the equipment is used in. In a single family home, that is
not under construction, changing or cleaning the filter every 60
days may be sufficient. In other applications such as motels, where
daily vacuuming produces a large amount of lint, filter changes
may be need to be as frequent as biweekly. See Table 1 for re-
placement filter sizes.
NOTE: Horizontal units containing two filters are taped together
at the factory to facilitate removal. This should be done by end
user as new filters are installed.
IMPORTANT: Units should never be operated without a filter.
Equipment should never be used during construction or reno-
vation due to possibility of contaminants entering the air coil
of the equipment which permanently affects the performance
and may shorten the life of the equipment.

Condensate Drain Pans

The condensate drain should be checked quarterly by cleaning and
flushing to ensure proper drainage.

Refrigerant System

Verify air and water flow rates are at proper levels before servic-
ing. To maintain sealed circuitry integrity, do not install service
gauges unless unit operation appears abnormal. Check to see that
unit is within the superheat and subcooling temperature ranges
shown in Tables 14-23. If the unit is not within these ranges, re-
cover and reweigh in refrigerant charge.

Compressor

Conduct annual amperage checks to ensure that amp draw is no
more than 10% greater than indicated on the serial plate data.

Fan Motors

All units have lubricated fan motors. Fan motors should never be
lubricated unless obvious, dry operation is suspected. Periodic
maintenance oiling is NOT recommended as it will result in dirt
accumulating in the excess oil and cause eventual motor failure.
Conduct annual dry operation check and amperage check to en-
sure amp draw is no more than 10% greater than indicated on se-
rial plate data and to remove any build up on the blower
assembly.

Condensate Drain Cleaning

Clean the drain line and unit drain pan at the start of each cooling
season. Check flow by pouring water into drain. Be sure trap is
filled to maintain an air seal.

Air Coil Cleaning

Remove dirt and debris from evaporator coil as required by condi-
tion of the coil. A 10% solution of dishwasher detergent and water
is recommended for cleaning both sides of the coil, followed by a
thorough water rinse. Clean coil with a stiff brush, vacuum clean-
er, or compressed air. Use a fin comb of the correct tooth spacing
when straightening mashed or bent coil fins.

Condenser Cleaning

Water-cooled condensers may require cleaning of scale (water de-
posits) due to improperly maintained closed-loop water systems.
Sludge build-up may need to be cleaned in an open water tower
system due to induced contaminants.
Local water conditions may cause excessive fouling or pitting of
tubes. Condenser tubes should therefore be cleaned at least once a
year, or more often if the water is contaminated.
Proper water treatment can minimize tube fouling and pitting. If
such conditions are anticipated, water treatment analysis is recom-
mended. Refer to the Carrier System Design Manual, Part 5, for
general water conditioning information.
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CAUTION