Nortek P7RE Series, Руководство по установке

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11
air conditioner Maintenance
Warning:
to prevent electrical shock, personal injury, or
death, disconnect all electrical power to the unit
before performing any maintenance or service.
the unit may have more than one electrical supply.
Proper maintenance is important to achieve optimum
performance from the air conditioner. The ability to properly
perform maintenance on this equipment requires certain
mechanical skills and tools. If you do not possess these
skills, contact your dealer for maintenance. Consult your
local dealer about the availability of maintenance contracts.
Routine maintenance should include the following:
• Inspect and clean or replace air filters at the beginning
of each heating and cooling season, or more frequently
if required.
• Inspect the condensate drain and outdoor coil at the
beginning of each cooling season. Remove any debris.
Clean the outdoor coil and louvers as necessary using a
mild detergent and water. Rinse thoroughly with water.
• Inspect the electrical connections for tightness at the
beginning of each heating and cooling season. Service
as necessary.
caution:
the unit should never be operated without a
filter in the return air system. replace disposable
filters with the same type and size.
• Do not add additional oil to motors unequipped with oil
tubes. The compressor is hermetically sealed at the
factory and does not require lubrication.
1. With the system operating at steady-state, measure the
liquid refrigerant pressure in psig at the service valve.
2. Measure the liquid refrigerant temperature (° F) at the
service valve.
3. For the temperature measured, determine the required
liquid refrigerant pressure from Table 5, (page 15) ,
Table 6, (page 15) , Table 7, (page 16) & Table 8,
(page 16), Table 9, (page 17) & Table 10, (page
17) for 1.5, 2, 2.5, 3, 3.5, & 4 ton units. For 5 ton
units see Figure 12 (page 18) .
• If the pressure measured in step 1 is greater than the
required liquid refrigerant pressure determined in step
3, then there is too much charge in the system. Remove
refrigerant and repeat steps 1 through 3 until the system
is correctly charged.
• If the pressure measured in step 1 is less than the
required liquid refrigerant pressure determined in step
3, then there is too little charge in the system. Add
refrigerant and repeat steps 1 through 3 until the system
is correctly charged.
Safety switches
The high-pressure switch is factory-installed and located
in the liquid line internal to the unit. The switch is designed
to protect the system when very high pressures occur
during abnormal conditions. Under normal conditions,
the switch is closed. If the liquid pressure rises above
650 psig, the switch will open and de-energize the unit.
The switch will close again when the liquid pressure
decreases to 460 psig.
The low-pressure switch (if equipped) is factory-installed
and located in the suction line internal to the unit. The
switch is designed to protect the compressor from a loss
of charge. Under normal conditions, the switch is closed.
If the suction pressure falls below 5 psig, the switch will
open and de-energize the unit. The switch will close again
when the suction pressure increases above 20 psig.