Johnson Controls SA PD 180 THRU 240 - Manual (Page 26)

430645-YIM-D-0610
26 Johnson Controls Unitary Products
HPS1 and LPS1 terminals of the UCB. If a switch has
opened, there should be a voltage potential between the
UCB terminals, e.g. if LPS1 has opened, there will be a 24-
volt potential between the LPS1 terminals.
9. If 24 volts is present at the UCB Y1 terminal and none of
the protection switches have opened, the UCB may have
locked out the compressor for repeat trips. The UCB
should be flashing a code. If not, press and release the
ALARMS button on the UCB. The UCB will flash the last
five alarms on the LED. If the compressor is locked out,
remove any call for cooling. This will reset any compressor
lock outs.
NOTE: While the above step will reset any lock outs,
compressor #2 will be held off for the ASCD, and
compressor #1 may be held off for a portion of the
ASCD. See the next step.
10. If 24 volts is present at the UCB Y1 terminal and none of
the switches are open and the compressor is not locked
out, the UCB may have the compressor in an ASCD.
Check the LED for an indication of an ASCD cycle. The
ASCD should time out within 5 minutes. Press and release
the TEST button to reset all ASCDs.
11. If 24 volts is present at the UCB Y1 terminal and the
compressor is not out due to a protective switch trip, repeat
trip lock out, or ASCD, the economizer terminals of the UCB
may be improperly wired. Check for 24 volts at the Y1 “OUT”
terminal of the UCB. If 24 volts is not present at the Y1
“OUT” terminal, the UCB must be replaced.
12. If 24 volts is present at the Y1 “OUT” terminal, check for 24
volts at the Y1 “ECON” terminal. If 24 volts is not present,
check for loose wiring from the Y1 “OUT” terminal to the
Mate-N-Lock plug, the jumper in the Mate-N-Lock plug,
and in the wiring from the Mate-N-Lock plug to the Y1
“ECON” terminal.
13. If none of the above corrected the error, test the integrity of
the UCB. Disconnect the C1 terminal wire and jumper it to
the Y1 terminal. DO NOT jump the Y1 to C1 terminals. If
the compressor engages, the UCB has faulted.
14. If none of the above correct the error, replace the UCB.