Charge Assist™ Procedure For A Non-Communicating 24Vac Control System; Before Adjusting System Charge - Trane ACONT900AC43UA Service Manual

Charge Assist™
NOTE: Charge Assist™ IS NOT allowed when a heat
pump is operating in the heating cycle. If the mode button
is pressed during an active compressor heat call, the
CHARGING (STABILIZING) LED will flash 10 times
indicating that CA is not allowed. Once an active call for
compressor heat has ended, CA may be entered.
CAUTION: Minimum equipment off time is bypassed
during Charge Assist™. Avoid cycling compressor
quickly. Observe the recommended 5-minute minimum
off time for compressor protection.
Charge Assist™ Procedure for a Non-
Communicating 24VAC Control System
STEP 1
Outdoor units coupled with 24 volt indoor units (outdoor
units require BAYACHP024* for 24V operation) require
the technician to set up the Variable Speed (VS) Air
Handler or VS Furnace with the DIP switches for the
size of the equipment installed. (Unit tonnage, CFM
per ton 350, 400, 450 required, the blower delays and
Heating airflow) CA cycle is compatible with
ENHANCED Mode.
STEP 2
A technician must set the indoor system control to
call for the SECOND STAGE of COOLING. The indoor
CONTROL must be set low enough to ensure the
system continues to run in SECOND STAGE of
COOLING throughout the CA mode cycle. The CA
control will exit the CA mode CYCLE if the system
control does not stay in the SECOND STAGE cooling
cycle. (The CA Control must see 24 Volts AC call on
both Y1 and Y2.)
STEP 3
Press the mode button on the CA board and follow
the CA procedures starting with STEP 1 in the
Communicating Comfort Control Section above.
CA - A 8
STEP 4
After the CA control exits the CA mode CYCLE, the
technician must
COMMUNICATING 24 volt indoor CONTROL to the
desired customer setting.
Charge Assist™ Quick Instructions
For detailed Charge Assist
equipment Service Facts.

Before Adjusting System Charge

Step 1
Verify that the outdoor temperature is between 55°F
and 120°F and the indoor temperature is between 70°F
and 80°F (Figure 16). Add system heat if needed.
Figure 16
Step 2
At the indoor unit, set the dip switches (Figure 17) for
the appropriate system size and airflow. Note: If using
a communicating comfort control, these settings will
be auto-configured.
Figure 17
then return the
TM
instructions, see the
NON-