FORM 150.60-NM3
29
YORK INTERNATIONAL
SWITCH 7
OPEN:
SYS 1 can be selected as the lag compressor by closing
a user supplied contact between Terminal 13 and 19.
See page 62.
CLOSED:
In this mode the micro determines which compressor is
assigned to the lead and the lag. A new lead/lag assign-
ment is made whenever both compressors shut down.
The micro will then assign the lead to the compressor
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 operation. 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 tempera-
tures below 25°F. See page 66 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 experi-
enced. See page 77 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.
M A N U A L
L E A D / L A G
A M B I E N T
&
D I S C H
P R
F A N
C O N T R O L
A U T O M A T I C
L E A D / L A G
D I S C H A R G E
P R E S S U R E
F A N
C O N T R O L
Summary of Contents for YCAJ44HE8
Page 16: ...16 YORK INTERNATIONAL WIRING DIAGRAMS LD02165 FIG 5 ELEMENTARY DIAGRAM...
Page 17: ...FORM 150 60 NM3 17 YORK INTERNATIONAL FIG 5 ELEMENTARY DIAGRAM Cont d LD02166...
Page 20: ...20 YORK INTERNATIONAL CONNECTION DIAGRAM ELECTRICAL BOX FIG 7 CONNECTION DIAGRAM LD02171...
Page 21: ...FORM 150 60 NM3 21 YORK INTERNATIONAL FIG 7 CONNECTION DIAGRAM Cont d LD02172...
