YORK INTERNATIONAL
87
FORM 150.40-NM25
This section is devoted to options which may be ordered
or retrofitted to the chiller. Listed below are the options
which are covered in this section.
EMS/BAS/FAX 4000
PRINTER
ALARM ANNUNCIATOR
0°F LOW AMBIENT ACCESSORY
EMS/BAS/FAX 4000 Option
GENERAL
The BAS Option (P/N 025-28380-101) consists of a Digi-
tal Input Board and associated wiring which allows re-
mote ON/OFF, remote unloading (turn lag system off,
i.e. decrease pull-down demand), and remote tempera-
ture reset. The location of this option is shown in Fig.
62. J18 which is plugged into terminals 2 and 3 must be
removed from the Combo Board and SW4 on the Micro
Logic Board must also be placed to the ON position (Figs.
50 & 51) for the option to operate.
REMOTE START/STOP
If an Optional Digital Input Board is installed, Remote
START/STOP can be accomplished by connecting “dry”
contacts between terminals 71 & 72 of TB8 which is
wired into terminals 3 & 4 of the Digital Input Board.
Opening the contacts stops the compressor and displays
an “A” code. Closing the contacts allows starting the
compressor and extinguishes the “A” code. See Fig. 50
or 51 to properly configure the switches on the Micro
Logic Board (SW4; ON) to make this option active. If
this function is not used, terminals 71 & 72 of TB8 must
be jumpered or an “A” code will result and the compres-
sor will not run. See Fig. 62, 63 and 64 for location and
wiring to TB8.
“OPTIONAL” REMOTE TEMPERATURE SETPOINT
RESET
Remote Temperature Setpoint Reset capabilities can be
added by adding an optional Digital Input Board and con-
figuring a switch on the Micro Logic Board (SW4; ON).
See Fig. 50 for location and switch positioning.
Temperature Setpoint changes are accomplished by
closing the “dry” contacts between terminals 75 & 76 of
TB8 which is wired into terminals 11 & 12 of the Digital
Input Board for a defined period of time. The lowest set-
point temperature desired must be set on the panel via
the “Chilled Water Temp. Select” rotary switches. Two
OPTIONS
DUAL CIRCUIT UNITS
reset ranges are available depending upon whether the
unit is equipped for standard or brine duty.
Standard Water Duty. Setpoint = 40°-70°
G.E.II.5 REV.2 (English)
EPROM Installed On Micro Logic Board
To change the setpoint, “dry” contacts between terminals
75 and 76 must be closed for a period between 1 and 11
seconds. Closure for a period shorter than 1 second will
be ignored by the Micro Logic Board. Closure slightly
longer than 11 seconds will be treated as 11 seconds.
The contact closure corresponds to a positive offset (rise)
from the setpoint on the panel. 1 sec. = +0° offset and
11 sec. = +15°F or offset = 1.5 (time closed – 1 sec.)
For example: A setpoint of 51°F on the panel and a con-
tact closure of 4.33 sec. will result in an offset of +5°F.
This raises the RWT setpoint to 56°F.
To maintain the remote setpoint described above, the
EMS Pulse Width Modulation input (terminals 75 and
76) on the Digital Input Board must be refreshed every
30 minutes or less (20 minutes is recommended). In
other words, to maintain the 56°F RWT setpoint, the
contacts between terminals 75 and 76 must be closed
for a period of 4.33 seconds every 20 minutes. If this is
not refreshed at least every 30 minutes, the Micro Logic
Board will take this as a signal to change the RWT
setpoint back to the original setpoint of 51°F on the Con-
trol Panel.
Brine/Metric Duty.
Setpoint = 15°* to 70°F (–9.4° to 21.1°C)
G.E.II.5 BR REV.1 (English) or
G.E.II.5M REV.1 (Metric)
EPROM Installed In Micro Logic Board
To change the setpoint, “dry” contacts between terminals
75 and 76 must be closed for a period between 1 and 21
seconds. Closure for a period shorter than 1 second will
be ignored by the Micro Logic Board. Closure slightly
longer than 21 seconds will be treated as 21 seconds.
The contact closure corresponds to a positive offset (rise)
from the setpoint on the panel. 1 sec. = +0° offset and
21 sec. = +40°F (4.4°C) or offset = 2 (time closed –
1 sec.). For example: A setpoint of 25°F (–3.9°) on the
panel and a contact closure of 8.5 sec. will result in an
offset of 15°F (8.33°C). This raises the RWT setpoint to
40°F (4.4°C).
*Leaving water temperatures of below 15°F (–9.4°C) are not per-
mitted, regardless of whether leaving or return water temperature
control is selected.
