Dunham-Bush ACXi 165-5SP-LN, Installation, Operation And Maintenance Manual

Page: 34 / 43

4.0 ELECTRICAL
3. Use Up and Down to select
CONTROL POINTS.
4. Press ENTER.
5. Use Up and Down to select
SCHEDULE control point.
6. Use
®
to display the first schedule.
The standard display screen would
show:
CP 17 SCHEDULE GRP: 1 SCH: 1
0000 2400 DAYS: *** ALL DAYS
***.
This indicates that control point 17
named SCHEDULE is controlled by
schedule group (GRP) #1. The first
schedule (SCH:1) turns on at 0000
hours and off at 2400 hours (military
time) every day of the week. Thus it
is on all the time.
7. To change this schedule, press
ENTER. The cursor will flash over
the turn-on time.
8. Use the number keys (0-9) to enter
the revised turn on time using military
format.
9. Press ENTER. The cursor will move
over to the turn-off time.
10. Use the number keys to enter the
turn-off time in military format.
11. Press ENTER. The cursor will move
to DAYS during which this schedule
is active.
12. To change the days for this schedule,
press one or more of the following
number keys: 0- Clear all current
days; 1- Sunday(S); 2- Monday(M);
3- Tuesday(T); 4- Wednesday(W); 5-
Thursday(R); 6- Friday(F); 7-
Saturday(A); 8- *** ALL DAYS***.
13. Press ENTER. The revised schedule
number is now stored.
14. To add another schedule, press the
right arrow key and repeat steps 7-13.
15. To delete a schedule, clear all of the
days by pressing 0 at Step 12.
The schedule group turns on when
any of the individual schedules turns
on. The turn on time does not have to
be earlier than the turn off time.
Schedules turn on by time and day,
but turn off by time alone. For
example, a schedule from 1900 to
0700 Saturdays would turn on at 7:00
PM Saturday (time and day) and turn
off at 7:00 AM Sunday (time only).
EXAMPLE
: If a unit is to operate at all
times except between the hours of 1:00
AM and 6:00 AM, the following
schedules would be entered:
CP 17 SCHEDULE GRP :1 SCH:
1 0000 0100 DAYS:
*** ALL DAYS ***
CP 17 SCHEDULE GRP:1 SCH:
2 0600 2400 DAYS: ***ALL DAYS
***
ANOTHER EXAMPLE:
A typical
building may require cooling from 6:00
AM to 7:00 PM Monday - Friday and
from 7:00 AM- 3:00 PM on Saturdays.
The schedules would be entered as
follows:
CP 17 SCHEDULE GRP:1 SCH:
1 0600 1900 DAYS: MTWRF
CP 17 SCHEDULE GRP: 1 SCH:
2 0700 1500 DAYS: A
4.5 CONTROL FUNCTIONS
4.5.1 Chilled Water Pump interlock
And Flow Switch (CWP And
CWFS)
These are field installed switches, both
of which are used to ensure chilled water
flow before the unit is allowed to start.
Failure of either one during operation
will cause the compressor to shut down.
A water flow alarm will be generated
and RESET must be pressed to clear the
alarm.
- 34 -