94 YORK INTERNATIONAL
DUAL CIRCUIT UNITS
0°F LOW AMBIENT ACCESSORY
GENERAL
The standard chiller is designed to operate in an ambi-
ent temperature of 35°F (1.7°C) or higher. If it is neces-
sary to operate the chiller in an ambient between 0°F
(–17.8°C) and 35°F (1.7°C), the chiller should be pur-
chased with the factory installed Low Ambient Kit.
OPERATION
The fundamental purpose of the Low Ambient Kit is to
reduce the capacity of the condenser when the ambient
temperature is in the 0°F to 35°F range. This assures
that adequate discharge pressures can be maintained
at low temperatures eliminating low suction pressure
faults. This is accomplished in three ways as follows:
1. The normally open solenoid valve in the condenser
liquid line is energized to stop flow in one half of the
condenser in each circuit, that is, one “V” bank in each
condenser. Note: Each valve has an orifice which has
been sized to prevent liquid build-up in the inactive
portion of the condenser.
FIG. 69 – ANNUNCIATION ALARM WIRING
LD01640
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