York YLAA Series Installation Operation & Maintenance page 135

FORM 150.72-ICOM6
ISSUE DATE: 12/29/2017
Option 19 – Pump Control
Pump Control is utilized to operate the optional on-
board pump kit or to control an external pump through
dry contacts 23 and 24 on Terminal Block XTBC2. To
use this option, the following selection should be made
in the Service Mode:
Y O R K H Y D R O
K I T P U M P S
When YORK HYDRO KIT PUMPS = 1, the controls
will be closed to run the pumps whenever any one of
the following conditions are true:
• Low Leaving Chilled Liquid Fault
• Any compressor is running
• Daily Schedule is ON and Remote Stop is closed.
Even if one of the above conditions are
true, the pump will not run if the chiller
has been powered up for less than 30 sec-
onds; or if the pump has run in the last
30 seconds to prevent pump overheating.
E X T E R N A L
E V A P
EXTERNAL EVAP PUMP should be selected if an ex-
ternal pump is being controlled with the chiller pump
contacts. The operation will be the same as YORK
HDRO KIT PUMPS = 1
The following option should not be selected.
Y O R K H Y D R O
K I T P U M P S
JOHNSON CONTROLS
= 1
P U M P
= 2
Option 20 – Pump Selection
The displays for this PUMP SELECTION option
should only appear if "YORK HYDRO KIT PUMPS =
2" are selected under Option 19. Presently, this option
should not be used.
Clock
The CLOCK display shows the current day, time, and
date. Pressing the CLOCK key will show the current
day, time, and date.
It is important that the date and time be correct, other-
wise the daily schedule will not function as desired if
programmed. In addition, for ease of troubleshooting
via the History printouts, the day, time, and date should
be correct.
To change the day, time, and date press the CLOCK
key. The display will show something similar to the
following:
T O D A Y I S F R I
2 5 J A N
The line under the F is the cursor. If the day is correct,
press the ENTER/ADV key. The cursor will move un-
der the 0 in 08 hours. If the day is incorrect, press the
↑ (UP) or ↓ (DOWN) arrow keys until the desired day
is displayed and then press the ENTER/ADV key at
which time the day will be accepted and the cursor will
move under the first digit of the "2 digit hour". In a
similar manner, the hour, minute, meridian, month, day,
and year may be programmed, whenever the cursor is
under the first letter/numeral of the item. Press the ↑
(UP) or ↓ (DOWN) arrow keys until the desired hour,
minute, meridian; day, month, and year are displayed.
Pressing the ENTER/ADV key will save the valve and
move the cursor on to the next programmable variable.
SECTION 7 – UNIT CONTROLS
0 8 : 5 1 A M
0 2
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