York Millennium YCAS 316, Installation Operation & Maintenance, Page: 95 / 144

FORM 201.10-NM1
95
YORK INTERNATIONAL
To program SYSTEM 2 COND TEMP, access the
password protected values as previously described. Key
in the value for the specific model number from Table 3
and press the ENTER key. The new value will be entered
into memory and the display will advance to the next
programmable option.
NOTE: Proper operation is dependent on proper
programming of this value.
Shown below is an example of this display:
COMMUNICATIONS MODE
COMMUNICATIONS MODE allows the operator to select
communications with a (1) ISN System or (2) an RCC
(Remote Control Center Option). To program the
COMMUNICATIONS MODE, key in the corresponding
number and press the ENTER key. The programmed
mode will be entered into memory and the display will
advance to the next programmable value. This is not
password protected and can be programmed anytime the
PROGRAM key is pressed.
LOAD SHARE BASED ON?
Selection of the LOAD SHARE BASED ON ? determines
whether loading/unloading (load sharing based on % FLA
or % slide valve). Generally, each should operate
satisfactory in most applications. The default method
utilizes % FLA and is simpler and requires less
programming. It is also less affected by ambient and
system conditions.
To select a method of load sharing, program a “1” for SV%
(slide value %) or a “2” for % FLA (motor current) and press
ENTER. The mode of control will be entered into memory
and the next programmable value will appear. This
selection is not password protected and can be
programmed at any time under the PROGRAM key.
Additional details regarding selection of this program
option are detailed starting on page 88.
ECONOMIZER VALVE ON POINT
(15-Ton TXV Liquid Supply Solenoid)
The Economizer Valve Solenoid On/Off points are
programmable by the user. At low load, the 15-ton TXV
solenoid is shut off to prevent feeding excessive liquid to
the compressor. As load rises, the 15-ton TXV solenoid
valve is energized, providing additional subcooling
needed for efficiency and additional motor cooling.
The recommended settings assume that compressor
start points are controlled by % FLA. Under these
conditions, the recommended ON Point is 50%.
To program the ECONOMIZER VALVE ON POINT,
access the password protected values described
previously. Key in the value and press “ENTER” key. The
new value will be entered into memory and the display will
advance to the next programmable value.
ECONOMIZER VALVE OFF POINT
(15-Ton TXV Liquid Supply Solenoid)
The Economizer Valve Solenoid On/Off points are
programmable by the user. At low load, the 15-ton TXV
solenoid is shut off to prevent feeding excessive liquid to
the compressor. As load rises, the 15-ton TXV solenoid
valve is energized, providing additional subcooling
needed for efficiency and additional motor cooling.
The recommended settings assume that compressor
start points are controlled by % FLA. Under these
conditions, the recommended OFF Point is 40%.
To program the ECONOMIZER VALVE OFF POINT,
access the password protected values described
S Y S T E M 2 C O N D T E M P
1 1 9 . 0 ° F = 1 0 0 % L O A D
C O M M U N I C A T I O N S M O D E
1 = I S N, 2 = R C C , 2
L O A D S H A R E B A S E D O N ?
1 = S V % , 2 = % F L A 2
E C O N O M I Z E R V A L V E
O N P O I N T 5 0 %
E C O N O M I Z E R V A L V E
O F F 4 0 %
TABLE 3 – CHILLER SYS 1 AND SYS 2 DESIGN
CONDENSING TEMP (CTP)
MODEL FOR ALL VOLTAGES
YCAS ENGR. DATA SYS 1 CTP SYS 2 CTP
140 6A2A2KN6A 116.1°F 116.1°F
160 6M4M4KN6A 118.3°F 118.3°F
170 6F5M5NN6A 121.3°F 118.5°F
180 6F5F5NN6A 121.4°F 121.4°F
190 6H6F5NN6A 124.3°F 121.4°F
216 6P6H5NN6A 128.8°F 124.4°F
236 6P7H6NN6A 128.8°F 128.8°F
246 6P7P7NN6A 130.1°F 130.1°F
216x 10H5H5NN6A 115.4°F 115.4°F
236x 10P6H6NN6A 118.6°F 115.3°F
266x 10S7S7NN6A 119.6°F 119.6°F