YORK INTERNATIONAL
101
FORM 155.16-O3
REF LEVEL UNLOADER SOLENOID – CLOSED
REMOTE LOAD LIMIT = XXX%
2
EPROM version A.02F.02 or later:
STEAM VALVE POSITION = XXX%
1
HOT WATER VALVE POSITION = XXX%
1
GENERATOR SHELL PRESSURE = XX.XX%
AUTO DECRYSTALLIZATION TEMP = XXX.X°F
REFRIGERANT LEVEL FLOAT SWITCH (1F) – CLOSED
3
REFRIGERANT LEVEL FLOAT SWITCH (3F) – CLOSED
3
MOTOR COOLANT FLOAT SWITCH (2F) – CLOSED
4
REFRIGERANT LEVEL SOLENOID – CLOSED
REMOTE LOAD LIMIT = XXX%
2
NOTES:
1. The “Steam Valve Position” message is displayed for
steam units (Micro Board program jumper JP1 is in).
The “Hot Water Valve Position” message is displayed
for hot water units (Micro Board program jumper JP1
is out). This value represents the present position of
the steam or hot water valve. It is provided by the
valve feedback potentiometer. The range is 0-100%.
The minimum position during unit operation is factory
set by the valve actuator limit switch at 20% of unit
capacity.
2. Displayed only when Control Center is in REMOTE
mode as follows:
• Value displayed is 100% to (10-20% as pro-
grammed; the minimum allowable steam or hot
water valve position is factory set to 10%. It should
only be changed by an authorized service techni-
cian using YORK “Service” manual, Form 155.16-
M3). The steam or hot water valve will be limited to
this position during system run. This load limit value
is a result of a 1-11 second PWM input to the relay
board TB4-82. The PWM input could be directly from
an external energy management or from the op-
tional card file mounted in the Control Center. The
card file accepts 4-20mA, 0-10VDC or discrete con-
tact closure inputs. Refer to “Field Control Modifi-
cations Diagrams”, Form 155.16-PA1 for details.
– or –
• If unit is connected to FAX-4500 Energy Manage-
ment System, the value displayed is the same as
above but is a result of input to Micro Board RS-
485 serial port TB-7 from FAX-4500. The steam or
hot water valve will be limited to this position during
system run.
3. Displayed only when unit is equipped with EPROM
version A.02F.02 (or later) and Buffalo pumps (Micro
Board program jumper JP2 in).
4. Displayed only when unit is equipped with Franklin
pumps. If equipped with Franklin pumps and EPROM
version A.02F.02 or later, Micro Board program jumper
JP2 must be out.
HISTORY PRINT – Press and release this key to ini-
tiate a history print to an optional printer. The last four
safety and cycling shutdowns are stored in memory in a
last in, first out format. Details of the optional printers,
installation and operation instructions are in YORK Form
155.16-NO1.2.
If a printer is connected to the Micro Board,
INVALID HISTORY DATA WILL NOT BE PRINTED
is momen-
tarily displayed when this key is pressed, and a history
of the last four safety or cycling shutdowns and a sys-
tem parameters that were valid at the time the shutdown
occurred are printed. If a history print is already in
progress,
HISTORY PRINT REQUEST IN PROGRESS . . .
is displayed.
If a printer is not connected to the Micro Board, the num-
ber of safety or cycling shutdowns (up to four) stored in
memory and a description of each is displayed on the
keypad display as follows:
X SAFETY SHUTDOWN(S) RECORDED IN HISTORY
is displayed for 2 seconds and then
HISTORY # 1 – SHUTDOWN ON: MON, DAY, YEAR
is displayed.
The “Display Hold” feature is automatically invoked. Press
and release the “Advance Day/Scroll” key to view the
cause of History #1 shutdown. If it had been caused by
a solution pump overload, for example,
TUES 7:06 AM SOLUTION PUMP OVERLOADS OPEN
is displayed. If there was more than one shutdown stored
in memory, pressing the ADVANCE DAY/SCROLL key
displays
HISTORY #2 – SHUTDOWN ON: MON, DAY, YEAR
. Pressing
the ADVANCE DAY/SCROLL key again, displays the
reason for History #2 shutdown as above. Each time the
ADVANCE DAY/SCROLL key is pressed, the next shut-
down and cause is displayed until the last shutdown is
displayed. When the last shutdown is displayed, the next
press of the ADVANCE DAY/SCROLL key causes the
