York YCAG18, Руководство пользователя

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YORK INTERNATIONAL
23
FORM 150.40-NM25
SINGLE CIRCUIT UNITS
matically allow reloading when suction pressure drops
below 330 PSIG (2274 kPaG). This feature reduces
the chance of faulting on high discharge pressure by
unloading or inhibiting loading which reduces the dis-
charge pressure.
ANTI RECYCLE TIMER
Any time a compressor shuts down for any reason, re-
start cannot occur until the 10-minute anti-recycle timer
has timed out (timer starts with compressor start) and a
minimum of 2 minutes (2-minute start-up timer) has ex-
pired since compressor shutdown.
Ex: Anti-recycle timer has 8 min. Ieft at shutdown:
Restart can occur in 8 minutes (Anti-recycle
time greater than 2 min.)
Ex: Anti-recycle timer has 1 min. left at shutdown:
Restart can occur in 2 min. (Anti-recycle time
less than 2 min.)
Ex: Anti-recyc3le timer has timed out at shutdown:
Restart can occur in 2 min. (Anti-recycle time
less than 2 min.)
Ex: Power failure has occurred:
Restart can occur 2 min. after the return of
power (Anti-recycle time less than 2 min.)
EMS/BAS/TIME CLOCK CONTROLS
REMOTE START/STOP BY A TIME CLOCK, BUILDING
AUTOMATION, OR ENERGY MANAGEMENT SYSTEM
Remote starting and stopping is accomplished by open-
ing and closing dry contacts, controlled by a remote
source, connected to the R.P. Relay. These contacts will
be wired in series with the Flow Switch which is con-
nected to terminals 3 and 4 of the terminal block (TB5)
at the lower left of the power panel (See Fig. 9). The
Micro Logic Board looks for the closure of the contacts
as a signal to start the system. Opening the contacts is
a signal to stop the system. Since the remote contacts
are wired in series with the Flow Switch, an “A” code will
appear on the display when a REMOTE STOP com-
mand is given (contacts open).
If an Optional Digital Input Board is installed, Remote
START/STOP can be accomplished by connecting “dry”
contacts between terminals 71 & 72 of TB8 on the lower
left of the power panel. Opening the contacts allows start-
ing the compressor and extinguishes the “A” code. See
Fig. 25 & 26 to properly configure the switches on the
Micro Logic Board (SW4;QN) to make this option ac-
tive. If this function is not used, terminals 71 & 72 of TB8
must be jumpered or an “A” code will result and the com-
pressor will not run. See EMS/BAS Option in OPTIONS
section for more information.
“OPTIONAL” REMOTE TEMPERATURE SETPONT 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. 25 & 26 for location and switch positioning.
Temperature Setpoint changes are accomplished by
closing the “dry” contacts between terminals 75 & 76 of
TB8 on the lower left of the power panel for a defined
period of time. The lowest setpoint temperature desired
must be set on the panel via the “Chilled Water Tempera-
ture Select” rotary switches. Two reset ranges are avail-
able depending upon whether the unit is equipped for
standard or brine duty.
STANDARD WATER DUTY. SETPOINT = 40-70°F GEII.4
REV.2 (Engish**) 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 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°F offset and
11 sec. = +15°F or offset = 1.5 (time closed –1 sec.)
Example: A setpoint of 51°F on the panel and a contact
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 as described above,
the EMS Pulse Width Modulation input (terminals 75 &
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 & 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.
BRINK DUTYSETPOINT= 15*-70°F(–9.4° to 21.1°C) GE II.4
BR REV.1 (English)** or GEII.4M REV.1 (Metric EPROM In-
stalled In Micro Logic Board
To change the setpoint, “dry” contacts between terminals
75 & 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.
*Leaving water temperature below 15°F (–9.4°C) are not permitted,
regardless of whether leaving or return water temperature control is
selected.
**The GEII.4 REV.2 may also be labeled GEII.4S REV.2. The two
EPROMs are identical.