YORK INTERNATIONAL
40
SWITCH 7
OPEN:
SYS 1 can be selected as the lag compressor by clos-
ing a user supplied contact between Terminal 13 and
19. See page 72.
CLOSED:
In this mode the micro determines which compressor
is assigned to the lead and the lag. A new lead/lag as-
signment is made whenever both compressors shut
down. The micro will then assign the lead to the com-
pressor with the shortest anti-recycle time.
SWITCH 8
OPEN:
Fan control will be by outside ambient temp. This will
be the standard mode of fan control for normal opera-
tion. In this mode, maximum chiller efficiency will be
achieved. If the Low Ambient option is installed, the fan
control will automatically change to pressure control at
temperatures below 25°F. See page 76 for fan control
sequence.
CLOSED:
Fan control is by discharge pressure only. This mode of
fan control will increase discharge pressure. It should
be used if nuisance low suction pressure faults are ex-
perienced. See page 88 for fan control sequence.
NOTE: Discharge pressure transducers must be in-
stalled. These are optional (Discharge Pressure
Read-out Option) unless a Low Ambient Kit is
installed.
MANUAL
LEAD / LAG
AMBIENT & DISCH PR
FAN CONTROL
AUTOMAT I C
LEAD / LAG
D I SCHARGE PRESSURE
FAN CONTROL
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