York MILLENIUM YCAS Series, Installation Operation & Maintenance, Page: 120 / 156

120
YORK INTERNATIONAL
SWITCH 2: Ambient Temp. Low Limit
Open:
Standard Ambient Mode auto-programs the Low Am-
bient Cutout setting at -4°C (25°F) and is not adjust-
able.
Closed:
Low Ambient Mode allows the Low Ambient Cut-Out
to be programmed from -18 to 10°C (0 to 50 °F). Val-
ues above -4°C (25°F) can be used to automatically
shut down the chiller when direct cooling methods be-
come operational.
SWITCH 3: Refrigerant
Open:
The R-407C Mode MUST be selected for models us-
ing refrigerant R-407C. Incorrect selection of this
switch may cause serious damage to the chiller.
Closed:
The R-22 Mode MUST be selected for models using
refrigerant type R-22. Incorrect selection of this switch
may cause serious damage to the chiller.
S 1 - 2 A M B I E N T C O N T R O L
S T A N D A R D
S 1 - 2 A M B I E N T C O N T R O L
L O W A M B I E N T
S 1 - 3 R E F R I G E R A N T
R - 4 0 7 C
S 1 - 3 R E F R I G E R A N T
R - 2 2
Dip Switch Physical Location and Setting
FIG. 40 – ENLARGED PHOTOGRAPH OF DIP
SWITCHES ON MICROPROCESSOR
BOARD
LD03511A
LD03511B
“OPEN” Position:
Left side of switch
pushed in
“CLOSED” Position:
Right side of switch
pushed in
Micro Panel Contents