Communicating Display Assembly; (Cda); Defrost Control (Hp Only) - Trane ComfortLink II 4TWL9024A1000B Installer's Manual

Communicating Display Assembly (CDA)
SYSTEM STATUS
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MONITOR MENU
The Monitor Menu
displays information on
System status, Drive stats
and the System Tachome-
ter.

Defrost Control (HP Only)

D D e e m m a a n n d d D D e e f f r r o o s s t t
The demand defrost control measures heat pump
outdoor ambient temperature with a sensor located
outside the outdoor coil. A second sensor located on
the outdoor coil is used to measure the coil
temperature. The difference between the ambient and
the colder coil temperature is the difference or delta-T
measurement. This delta-T measurement is
representative of the operating state and relative
capacity of the heat pump system. By measuring the
change in delta-T, we can determine the need for
defrost. The coil sensor also serves to sense outdoor
coil temperature for termination of the defrost cycle.
F F a a u u l l t t I I d d e e n n t t i i f f i i c c a a t t i i o o n n
A fault condition is indicated by the CDA connected to
the control board inside the heat pump control box.
D D e e f f r r o o s s t t E E n n a a b b l l e e d d
Demand Defrost is enabled with the following inputs to
the drive::
• Outdoor ambient temperature sensor (ODS-B)
reporting an outdoor temperature at or below 52° F.
• Coil temperature sensor (CBS) reporting a coil
temperature at or below 32° F.
• Heat/Cool Demand (HCD) from the communicating
comfort control for at least two minutes or more.
D D e e f f r r o o s s t t I I n n i i t t i i a a t t i i o o n n
18-BC100D1-1D-EN
TECHNICIAN MENUS
ALERT HISTORY
ALERT MENU
MENU
The Alert Menu displays
The Alert History menu
active alerts. displays alerts stored over
time. Note that clearing
Alert History will also
clear Active Alerts.
NAVIGATION
• To enter and exit Technician Menus, press the Up/Down buttons
simultaneously for 5 seconds.
• To return to the Home Screen, press the Up/Down buttons
simultaneously for 5 seconds.
• To return to the top level of any menu, press the Left/Right buttons
simultaneously for 5 seconds.
• After ve minutes of inactivity in the Technician Menu section, the
Home Screen will be displayed. Pressing the Enter button for
5 seconds will increase this time to 20 minutes.
CONFIG MENU
The Con guration Menu
is where System parame-
ters and options are set
and reported.
1. External shut down
(Load Shed)
2. Min. Air ow
3. Blower on/o delays
4. Custom Air ow
5. PFC (Power Factor
Correction)
The calculated temperature difference between the
outdoor temperature sensor and the coil temperature
sensor is called Delta T. Defrost can occur once the
current Delta T exceeds the Delta T initiate value. . This
adaptive logic assures a complete defrost for a range of
outdoor temperatures.
N N o o t t e e : : There are three (3) defrost termination
temperature selections available in the Configure
Menu. Factory is set to 47°F, medium is 53°F, and
high is 60°F.
C C D D A A N N a a v v i i g g a a t t i i o o n n t t o o F F o o r r c c e e d d D D e e f f r r o o s s t t
Figure 1. CANda Mini Menu
CONFIG
CONTROL MENU
MENU
FRC DFT
PRESS ENTER
N N O O T T E E S S : : F F o o r r c c e e d d D D e e f f r r o o s s t t
CONTROL MENU
The Control Menu
contains a selection of
unit function tests that
are used to verify opera-
tion.
1. FRC DFT (Forced Defrost)
2. EEV Test
3. Evacuation
4. Drive Diagnostic Test
5. OD Fan Test
MONITOR
MENU
TEST IN PROGRESS
CTS <value>
TEST COMPLETE
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