Johnson Controls DMS 360 Series, Инструкция по установке, эксплуатации и обслуживанию

Страница: 26 / 28

Installation, Operation and Maintenance Manual : 036-1011(0806) Page 25
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
present, trace the wiring from Y1 “OUT” for incorrect
wiring. If 24 volts is not present at the Y1 “OUT” terminal,
the UCB must be replaced.
12. 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, has faulted.
13. If none of the above correct the error, replace the UCB.
TABLE 11 : UNIT FLASH CODES
UNIT FLASH CODES
Various flash codes are utilized by the unit control board
(UCB) to aid in troubleshooting. Flash codes are
distinguished by the short on and off cycle used
(approximately 200 ms on and 200 ms off). To show normal
operation, the control board flashes a 1 second on, 1 second
off heartbeat during normal operation. This is to verify that
the UCB is functioning correctly.
Do not confuse this with an error flash code. To prevent
confusion, a 1-flash, flash code is not used. Current alarms
are flashed on the UCB LED. Pressing and releasing the
ALARMS button on the UCB can check the alarm history.
The UCB will cycle through the last five (5) alarms, most
recent to oldest, separating each alarm flash code by
approximately 2 seconds.
In some cases, it may be necessary to “zero” the ASCD for
the compressors in order to perform troubleshooting. To
reset all ASCDs for one cycle, press and release the UCB
TEST button once.
Similarly, if compressor of any stage is not operating, follow
the same procedure as listed above with respective
compressor, contactors and terminal numbers (Refer table
10).
TABLE 10 : COMPRESSOR, CONTACTORS & TERMINAL NUMBER FOR
EACH COOLING STAGE
Note : The above mentioned flash codes are applicable for
both Simplicity® control boards. However, the Simplicity 2
board will represent data for circuits / compressors 3 & 4
only.