Trane ComfortLink II 4TWZ0036B1000A Service Facts page 4

Charge Assist™ (CA) Procedure with a Communicating Comfort Control
CAUTION
!
CONTAINS REFRIGERANT!
SYSTEM CONTAINS OIL AND REFRIGERANT UNDER
HIGH PRESSURE. RECOVER REFRIGERANT TO RELIEVE
PRESSURE BEFORE OPENING SYSTEM.
Failure to follow proper procedures can result in personal
illness or injury or severe equipment damage.
NOTE: On the Charge Assist™ control set the LINE LENGTH
DIP SWITCHES before running system or entering CA Mode.
See Subcool Charging Corrections Table on page 2.
The Communicating Comfort Control will auto-configure the
system size and airflow requirement at power-up. The Charge
Assist™ (CA) Mode will set the indoor blower to 100%, over-
ride any blower delays and run compressor 2nd stage. (Green
LEDs Y1 and Y2 will be on. The Green Status LED will be
turned off.)
Procedure
STEP 1:
Press MODE button (See Figure 2) for 2 seconds to enter
the CA mode. The CA control takes control of the system
and overrides the Communicating Comfort Control. The
Green STATUS LED is turned OFF. The CA control will
run the first stage compressor for one minute. Green LED
Y1 is on. The CA control will then run the second stage
compressor. Green LEDs Y1 and Y2 will then be ON. The
CA control now starts its Charge Assist™ mode. The CA
control will now check the operating Conditions before
continuing the CA Mode.
NOTE: To stop the CA mode at anytime, press the MODE
button. The CA control will then begin slowly flashing its
Green STATUS LED indicating that the CA control is now
in its normal operating mode.
4
CHARGE ASSIST
TM
1
PORT LOCATION
LIQUID
REFRIGERANT
WARNING
!
Live Electrical Components!
During installation, testing, servicing and troubleshooting of
this product, it may be necessary to work with live electrical
components. Failure to follow all electrical safety precautions
when exposed to live electrical components could result in
death or serious injury.
Outdoor Temperature (ODT) Must be between 55°F and
120°F. If ODT is below 55°F or above 120°F, the ODT,
OUT OF RANGE, Red LED will flash ON and OFF for 30
seconds. This error condition causes the CHARGING
(STABILIZING) Amber LED to flash 10 times. The CA
control will then exit the CA mode and the Green Status
LED begins to flash slowly.
Liquid Line Temperature (Must be within range) If this
sensor is shorted or open - This error condition causes an
11 flash on FAULT LED.
Liquid Line Pressure (Must be above 90 psig) If the liquid
pressure is below 90 psig, the LOW PRESSURE Red LED
will turn on for 30 seconds. This error condition causes the
CA control to flash its CHARGING (STABILIZING) Amber
LED 10 times. The CA control will then exit the CA mode
and it then begins flashing its Green Status LED slowly.
STEP 2:
Enter Stabilization Routine The CHARGING (STABILIZ-
ING) Amber LED will begin to flash.
The CA control will then indicate the time it will take for the
refrigerant system to stabilize by flashing its CHARGING
(STABILIZING) Amber LED. (See SUMMARY on page 7
for flash rate details.)
The CA control may run the system for up to twenty min-
utes to insure the refrigerant system is at a steady operat-
ing state. Once the system is at a steady operating state
the CA control will enter the Charging Routine.
STEP 3:
CHARGE ASSIST
2
CIRCUIT BOARD DETAIL
TM