Trane LO - Manual (Page 99)

UNT-IOM-6 99
Terminal Unit
Control (TUC)
Autocycle Test
The autocycle test is an operating mode that activates the TUC
outputs in a defined series of steps. This function allows the techni-
cian to to manually exercise each TUC output by sequentially
stepping through the 16 stages of the autocycle test
Note: Do not leave unit unattended while in test mode because the
unit safety shutdowns are not functional.
Note: During the autocycle test, the TUC ignores all unit safety
diagnostics. Take precautions to ensure the hydronic coil is not
subject to freezing conditions.
CAUTION: If the TUC is left in the autocycle test
mode, it will automatically return to normal unit opera-
tion after 60 minutes.
To place the TUC in the autocycle test mode, perform the following
steps. Refer to Table 23 onpge 72 for details on the staging.
1. Read and record the initial TUC address.
2. Set the TUC DIP switch #7 to ON (address = 2). All other switches
should be off.
3. To automatically cycle through the stages, short and hold the TUC
test input (short J11 and J12 together). Continue holding the test
input and the unit will cycle to each subsequent stage every 30
seconds.
4. To manually step between stages, momentarily short the test input
to advance to the next test stage.
5. When the autocycle test is complete, return the DIP switches to
the initial positions recorded in step 1. Short the test inputs to set the
address in the TUC EEPROM.
!
BIP2: Motion
Detection The motion detection input when used with a motion detection switch
(installer supplied) detects the absence of motion in the space during
the occupied mode. If no motion is detected, the TUC controls the
space to alternate heating and cooling setpoints while also controling
the economizer damper option to the minimum position. The factory
configures the 24V dry contact input as normally closed. However, it
can also be normally open if using the correct switch. A closed signal
indicates alarm.