INSTALLATION INSTRUCTIONS
R−410A, Two−Stage Split System Air Conditioner
12
421 01 6002 01
Two−Stage Compressor Resistance (winding resistance) at 70
°
F +/− 20
°
F
(21
°C
+/− 11
°
C)
Winding
*4A624
*4A836
*4A648
*4A660
Start (S−C)
1.40
1.29
1.52
0.60
Run (R−C)
1.32
0.89
0.64
0.49
NOTE: The rectifier for the DC solenoid is contained
within the Comfort Alert UltraTech device. The plug at the
compressor solenoid is an ordinary 2−wire plug. Never
use a plug with internal rectifier with this system.
NOTE: The DC compressor solenoid plug that connects
to the Comfort Alert UltraTech is polar dependent and
should only be connected with the tabs aligned.
Unloader Test Procedure with Comfort Alert
t
Module
The unloader is the compressor internal mechanism,
controlled by the DC solenoid, that modulates between
high and low−stage.
If it is suspected that the unloader is not working, the
following methods may be used to verify operation.
1.
Operate the system and measure compressor
amperage. Cycle the unloader on and off at ten
plus second intervals by applying and removing Y2
voltage to the module. Wait five seconds after
power is applied to Y2 before taking a reading. The
compressor amperage should go up or down at
least 25 percent.
2.
If step one does not give the expected results,
remove the solenoid plug from the compressor
and, with the unit running and the thermostat
calling for Y2 to be energized, test the voltage
output at the plug with a DC voltmeter.
The reading here should be 4 to 18 volts. If NOT,
unplug the harness from the module and check
voltage at the “DC Sol” pins of the module. The
module will not power the unloader solenoid if the
compressor is not running or fault code 1 or 9 is
active.
3.
If the correct DC voltage is at the control circuit
molded plug, measure the unloader coil
resistance. The resistance should be 32 to 60
ohms depending on compressor temperature. If
the coil resistance is infinity, much lower than 32
ohms, or is grounded, the compressor must be
replaced.
MAINTENANCE
Condensate Drain
During the cooling season, check monthly for free flow of
drainage and clean if necessary.
Cleanliness
These tips will help keep the air conditioner looking better
and working more efficiently:
1.
Free flow of air is essential. Keep fences, shrubs,
trash cans, and other obstructions at least 18
inches (457mm) from all coil inlets.
2.
Keep the coil free of grass clippings, leaves,
weeds, and other debris.
NOTE: Coil may occasionally require cleaning with
a liquid solution. The coil must be cold when
cleaning. Use an alkaline based cleaner only.
Cleaning a hot coil or using an acid based cleaner
will remove the paint from the fins and may clog the
coil.
3.
Never use a weather cover over the outdoor unit
unless it is a ventilated type or made of breathable
fabric that will allow moisture to evaporate rapidly.
A cover that holds moisture in the unit will cause
more rust build−up and damage than normal
exposure to weather.
