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INSTALLATION INSTRUCTIONS
TROUBLESHOOTING
Models are factory equipped with the Comfort Alertt
UltraTecht Diagnostics device (refer to Figure 11) in the
control box.
Comfort Alert UltraTech
compressor staging from low to high and high to low
capacity.
Comfort
around-the-clock monitoring for common electrical
problems, compressor defects, and broad system faults.
If trouble is detected, an alert code is displayed with a
flashing LED indicator. Alert codes are listed in Figure 12.
The device is factory wired and requires no
modification. Low voltage lead wires are provided in the
control box for connection to thermostat wires (use wire
nuts).
The Comfort Alert UltraTech must be powered to properly
stage compressor to high capacity. Energizing the Y (Y1)
terminal operates the compressor in low stage. Both the
Y (Y1) and Y2 terminals must be energized for
high-stage operation.
The Comfort Alert UltraTech device operates by
monitoring the compressor power leads and the
thermostat demand signals Y (Y1) and Y2 terminals. It
draws constant 24 VAC power at the R and C terminals.
When the compressor is operating in low stage (Y or Y1),
the 24v DC compressor solenoid coil is de-energized.
When the compressor is operating in high stage (Y or Y1
and Y2), the 24v DC solenoid coil is energized. The 24v
DC plug that is connected to the compressor does NOT
have an internal rectifier. DO NOT INSTALL A PLUG
WITH INTERNAL RECTIFIER.
Two-Stage Compressor Resistance (winding resistance) at 70°F +/- 20°F
Winding
Start (S-C)
Run (R-C)
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 Alertt 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.
421 01 6001 00
provides
Alert
UltraTech
provides
*4A624
1.40
1.32
R-410A, Two-Stage Split System Air Conditioner
Figure 11 Comfort Alertt UltraTecht Diagnostics
R
C
S
*4A836
*4A648
1.29
1.52
0.89
0.64
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,
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.
"Power" LED
Thermostat Demand
nd
2
Stage Compressor
Y2
Y
Thermostat Demand
st
1
Stage Compressor
Data Port
L
Thermostat Signal
R
24 VAC HOT
C
24 VAC Common
DC Compressor
Solenoid
"Alert" LED
"Trip" LED
*4A660
0.60
0.49
measure
the
unloader
coil
11
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