Page 29
14ACX SERIES
System Operation
IMPORTANT
Some scroll compressor have internal vacuum protector
that will unload scrolls when suction pressure goes
below 20 psig. A hissing sound will be heard when the
compressor is running unloaded. Protector will reset
when low pressure in system is raised above 40 psig. DO
NOT REPLACE COMPRESSOR.
The outdoor unit and indoor blower will cycle on and off as
dictated by demands from the room thermostat. When the
thermostat's blower switch is in the ON position, the indoor
blower will operate continuously.
HIGH PRESSURE SWITCH (S4)
14ACX units are equipped with a high‐pressure switch that
is located in the liquid line of the compressor as illustrated
in figure on page 2 and figure 19 for the location of the
manual reset button..
MANUAL RESET
BUTTON
Figure 19. High Pressure Switch (S4) Manual Reset
The switch is a Single Pole, Single Throw (SPST),
manual-reset switch which is normally closed and
removes power from the compressor when discharge
pressure rises above factory setting at 590 + 10 psi. The
manual-reset button can be identified by a red cap that is
press to preform the reset function.
CRANKCASE HEATER (HR1) AND THERMOSTAT
(S40)
Compressor in models listed below are equipped with a 40
watt or 70 watt (all others), belly band type crankcase
heater. HR1 prevents liquid from accumulating in the
compressor. HR1 is controlled by a single pole, single
through thermostat switch (S40) located on the liquid line
(see figure 1 for location).
When liquid line temperature drops below 50° F the
thermostat closes energizing HR1. The thermostat will
open, de-energizing HR1 once liquid line temperature
reaches 70° F.
The crankcase heater (HR1) and thermostat (S40) are
used only on the following models:
14ACX-041-230-01
14ACX-047-230-01
14ACX-059-230-01
14ACX-048-230-XX (all models)
14ACX-060-230-XX (all models)
THERMAL PROTECTION SWITCH (S173) -
COMPRESSOR MOUNTED
Some units are equipped with a compressor mounted
normally closed temperature switch that prevents
compressor damage due to overheating caused by
internal friction. The switch is located on top of the
compressor casing. This switch senses the compressor
casing temperature and opens at 239-257°F
(115°C-125°C) to shut off compressor operation. The
auto-reset switch closes when the compressor casing
temperature falls to 151-187°F (66°C-86°C), and the
compressor is re-energized. This single-pole, single-throw
(SPST) bi-metallic switch is wired in series with the 24V Y
input signal to control compressor operation.
Maintenance
Maintenance and service must be performed by a qualified
installer or service agency. At the beginning of each
cooling season, the system should be checked as follows:
Outdoor Unit
1. Outdoor unit fan motor is pre-lubricated and sealed.
No further lubrication is needed.
2. Visually inspect all connecting lines, joints and coils for
evidence of oil leaks.
3. Check all wiring for loose connections.
4. Check for correct voltage at unit (unit operating).
5. Check amp draw on outdoor fan motor.
Motor Nameplate:_________ Actual:__________.
6. Inspect drain holes in coil compartment base and
clean if necessary.
NOTE ‐ If insufficient cooling occurs, the unit should be
gauged and refrigerant charge should be checked.
Outdoor Coil
Clean and inspect outdoor coil (may be flushed with a
water hose). Ensure power is off before cleaning.
NOTE — It may be necessary to flush the outdoor coil
more frequently if it is exposed to substances which are
corrosive or which block airflow across the coil (e.g., pet
urine, cottonwood seeds, fertilizers, fluids that may
contain high levels of corrosive chemicals such as salts)
Sea Coast — Moist air in ocean locations can carry salt,
which is corrosive to most metal. Units that are located
near the ocean require frequent inspections and
maintenance. These inspections will determine the
necessary need to wash the unit including the outdoor coil.
Consult your installing contractor for proper
intervals/procedures for your geographic area or service
contract.
Indoor Unit
1. Clean or change filters.
2. Lennox blower motors are prelubricated and
permanently sealed. No more lubrication is needed.
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