York YCAQ10, Руководство пользователя, Страница: 39 / 99

FORM 150.40-NM20
39
YORK INTERNATIONAL
tive switch must be in the “ON” position.
4. “DATA DISPLAY CODES”
Refer to this list when selecting the desired system
parameter to be displayed. A list of the codes and
their respective number is shown in Fig. 14.
5. “UNIT START-UP SEQUENCE”
This is a simplified start-up procedure for switch setup
of the panel and system.
6. “SYSTEM MONITORING OR DIAGNOSIS”
This list informs the operator of the meaning of the
alphabetic codes which may appear on the display.
Anti-recycle status, external device status, and fault
information is displayed using this alphabetical code.
(See Fig.13 and 14.)
7. “FAULT CODES”
Any time an “F” appears on the display, one or both
compressors will be shut down on a safety control.
At this time, the operator should turn the “SELECT
DATA DISPLAY” rotary switches to the number “18”.
When this is done, a Fault Code will appear which
can be compared to the “FAULT Code” list to deter-
mine the reason for system failure. A list of the codes
and their respective number is shown in Fig. 14.
An “F” Code overrides any other letter code display
which may appear. See the “SHUTDOWN SAFETY
CONTROLS” and “MANUAL RESET SAFETY CON-
TROLS” Section for a more detailed explaination of
the codes.
8. “WATER COOLING RANGE CODE”
Refer to this list when setting up the “WATER COOL-
ING RANGE” rotary switch. Since the switch does
not read directly, decoding is necessary.
9. “SYS 1 LEAD/LAG” Select
This switch allows the operator to select SYS 1 as
the lead or lag compressor. Note: See Micro Logic
Board Jumper/Switch Section for automatic lead/lag
switching by the Micro Logic Board.
10. “SELECT DATA DISPLAY” Switches
These switches can be used to display 18 Test Points
for troubleshooting and data recording. This is done
via the 2 Rotary Switches marked “Select Data Dis-
play”. To look at a specific function, select the num-
ber of the function from the “Data Display Codes”
listing on the panel.
Proceed by dialing the number up on the “Select Data
Display” Rotary Switches. In the event of a failure,
the failure can be displayed by selecting #18 of the
“Select Data Display”. The mode of failure will then
be indicated by a number from 0-11. This number
can be translated by comparing the number to the
“Fault Code” listing on the right side of the panel.
(YCHA120, 150, 175, & 200)
• System 2 % Full Load Motor Current
• System 2 Suction Pressure
• System 2 Oil Pressure, PSID
• System 2 Discharge Pressure
• Suction Pressure Cutout Setting, PSIG
• Water Cooling Range Temperature
(Also see Fig. 14 for a complete list)
The system “Return Chilled Water Temp” is entered by
two rotary switches and the “Water Cooling Range” by
a single rotary switch.
System 1 and 2 can be activated by 2 toggle switches.
These switches normally remain “ON” after startup. A
toggle switch is available to select compressor #1 as
the lead or lag system.
Remote cycling, unloading, and Return Chilled Water
Temp Setpoint Reset can be accomplished as noted
on Page 42. Loading and unloading decision making is
done by software on the Micro Logic Board. These de-
cisions are made according to temperature deviations
from the selected setpoint and the selected cooling
range resulting in more precise control of water tem-
perature.
CONTROL PANEL
1. “CHILLED WATER TEMP SELECT”*
Control is achieved by Return Chilled Water Setpoint
(adjustable from 0°F to 70°F in one degree incre-
ments). Setpoint is entered via two rotary switches
on the control panel marked “Chilled Water Temp.
Select °F”.
*If needed,the unit can be configured to control Leav-
ing Chilled Water Temp. This can be accomplished
by a jumper/switch on the Micro Board. See Fig. 20
& 21.
J10 OUT / SW. 3 OFF RWT Control
J10 IN / SW. 3 ON LWT Control
NOTE: It is recommended that RWT control be used
unless LWT control is absolutely necessary.
Control via LWT is best obtained using optional
additional steps of loading. Contact YORK Sales
for this option.
2. “WATER COOLING RANGE” Select Switch
Temperature control range is variable via a single
rotary switch labeled “Water Cooling Range”. There
will be a choice of eight settings (0-7). Available
ranges are 6.0°F, 7.0°F, 8.0°F, 9.0°F, 10.0°F, 11.0°F,
12.0°F, and 14.0°F, corresponding to setting 0-7 re-
spectively.
3. SYS 1 and SYS 2 “ON/OFF” Switches
These switches allow the operator to manually turn
off either system. To operate a system, the respec-