York YCAS Series, Installation Operation & Maintenance

Page: 159 / 216

159 YORK INTERNATIONAL
FORM 201.19-NM8 (804)
Closed:
Low Ambient Mode allows the Low Ambient Cut-Out
to be programmed from 0 to 50 °F (-18 to 10°C). Val ues
above 25°F (-4°C) 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.
SWITCH 4: Unit Type
Open:
DO NOT USE THIS POSITION.
Incorrect programming may cause
damage to the chiller.
Closed:
Place the switch in the CLOSED position selects the
type of chiller as an air cooled chiller (YCAS). The
switch MUST always be in the CLOSED position.
Incorrect programming may cause
damage to the chiller.
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. 77 –
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
8
S 1 - 4 Y C W S
S 1 - 4 Y C A S
SWITCH 5: Motor Current Average option
(start-up)
Open:
DO NOT USE THIS POSITION.
Nuisance trips at start-up could result.
S 1 - 5 M O T O R C U R R E N T
A V E R A G I N G E N A B L E D
028981-G