Mechanical Control Settings; Remote Cld Operation; Communication Failure - Trane RTAA-70 Installation & Maintenance Manual

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Controls Interface

Mechanical Control Settings

The settings for the High Pressure switch, Oil Pressure switch, and Winding
Thermostat are shown below:
Compressor Discharge High Pressure
Switch – PSIG
Compressor Motor Winding
Thermostat – F
Low Pressure Cutout

Remote CLD Operation

With only few exceptions, operation of the Remote CLD is identical to the
unit's CLD. To ease the operation of the Remote CLD, additional displays have
been added. For example, if multiple unit operation is used, the following
display will be inserted as the second display of the setpoint group:
Modify Setpoints for Units
"Press (+) (-) to change settings"
The Stop and Auto keys function in the same manner, but the following
hierarchy between the unit's Stop/Auto keys and the Remote CLD Stop/Auto
keys is as follows:
1. Local Stop will always override Local Auto, Remote Stop and
Remote Auto.
2. Local Auto will always override Local Stop, Remote Stop and
Remote Auto.
3. Remote Stop will override Local Auto and Remote Auto but not
Local Stop.
4. Remote Auto will override Local Auto and Remote Stop but not
Local Stop.
If an operator tries to start the unit from the Remote CLD after the Stop
command has been given at the unit CLD, the screen on the Remote CLD will
read:
"LOCAL STOP command at unit cannot be
overridden by this remote device"

Communication Failure

If a communication failure occurs between the Remote CLD and the unit's
CLD, the setpoints will remain the same but a diagnostic will occur at the
Remote CLD panel. The Remote display screen will read:
"No communication to Unit X"
Press (enter) to select new unit
CLOSE OPEN
300 ±20 405 ±7
181 221
22 ±4 7 ±4
X
RTAA-SVX01A-EN