Nortek JS4BD-KA User Manual

8
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lters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.
(pages 10 -12) and Figures 3 - 9 (pages 12 - 15) for
correct system charging.
• S4BDoutdoorunitswithnon-AHRIlistedindoorcoils
are not recommended. Deviations from rated airflows or
non-listed combinations may require modification to the
expansion device and refrigerant charging procedures
for proper and efficient system operation.
• Therefrigerantchargecanbecheckedandadjusted
through the service ports provided external to the
outdoor unit. Use only gage line sets which have a
“Schrader” depression device present to actuate the
valve.
Charging the Unit in AC mode at outdoor temperatures
above55°Fforoptimizedsub-coolingof10°F-12°F.
1. With the system operating at steady-state, measure the
liquid refrigerant pressure (in psig) at the outdoor unit
service valve.
2. Measure the liquid refrigerant temperature (in
Fahrenheit) at the service valve.
3. Determine the required liquid refrigerant pressure from
the appropriate charging chart (Figures 3 - 9).
•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, there is too little charge in the system. Add
refrigerant and repeat Steps 1 through 3 until the
system is correctly charged.
COMPONENT FUNCTIONS
Comfort Alert
TM
Diagnostics (Select Models Only)
The Comfort Alert diagnostics module troubleshoots
heat pump and air conditioning system failures and
accurately detects the cause of electrical and system
related failures without any sensors. A flashing LED
indicator communicates the ALERT code to quickly direct
the technician to the root cause of a problem.
High Pressure Switch (HPS) - A high-pressure switch
is factory-installed and located in the liquid line internal
to the outdoor 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 575 psig, then the switch
willopenandde-energizetheoutdoorunit.Theswitchwill
close again once the liquid pressure decreases to 460
psig. Please note that the switch interrupts the thermostat
inputs to the unit. Thus, when the switch opens and then
closes, there may be a 5 minute short cycling delay before
theoutdoorunitwillenergize.
Low-Pressure Switch - (Select Models) A low-pressure
switch is factory-installed and located in the suction line
internal to the outdoor 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,thentheswitchwillopenandde-energizethe
outdoor unit. The switch will close again once the suction
pressure increases above 20 psig. Please note that the
switch interrupts the thermostat inputs to the unit. When
the switch opens and then closes, there will be a 5 minute
shortcyclingdelaybeforetheoutdoorunitwillenergize.
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 attempt to add additional oil to motors un-
equipped with oil tubes. The compressor is hermetically
sealed at the factory and does not require lubrication.

Nortek JS4BD-KA Specifications

General

Brand	Nortek
Model	JS4BD-KA
Category	Air Conditioner
Language	English