Conair 0.25 to 1.5 ton, User Manual

Page: 36 / 44

Page: 36
VL Series Portable Chillers, 0.25 to 1.5 Tons UGH020/0301
Therefore, the water supply source must be disconnected
and the connection capped. The operator must monitor the
water/glycol level and manually make-up to maintain
proper reservoir level.
D. SAFETY ADJUSTMENTS
1. To ensure safe and efficient operations at lower setpoints,
adjustments of the freezestat and low pressurestat factory
settings are required. Figure 8.2B lists the appropriate
settings.
2. The freezestat serves as the mainline defense
against freezing in that it shuts down the chiller if the
coolant temperature ever decreases to its setting. For
mechanical freezestats, adjustments are made by removing
the cover and rotating the selector dial with a screwdriver.
Electronic freezestats are adjusted through the setup
parameters via the instrument control panel.
3. The low pressurestat serves to protect the compressor from
unsafe suction pressures. Suction pressures decrease with
lower operating setpoints. To prevent short cycling of the
compressor, the low pressurestat must be adjusted to
accommodate the lower setpoint. Adjustments to the low
pressurestat are made by rotating the adjusting screws on
top of the control and observing the movement of the
pointers in the control window until the prescribed setting
is determined.
E. PRECAUTIONS
1. At any setpoint, the possibility of freezing exists and it is the
operator’s responsibility to take necessary action to prevent
freezing at all times.
Figure 8.2B