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B-1 l Appendix
Safety Adjustments
To ensure safe and efficient operation at lower setpoints, adjustments of the
low pressure switch from factory settings is required. The table below lists the
appropriate settings.
The low pressure switch serves as the mainline defense against freezing. It
shuts down the chiller if the coolant temperature ever decreases to its setting.
To adjust a mechanical low pressure switch:
1 Disconnect and lockout the main power supply.
2 Remove the chiller’s right-side panel, as viewed from the control.
3 Locate the low pressure switch within the top portion of the chiller’s cabinet.
4 Turn the low pressure cut-in and cut-out adjustment screws found on the
top of the low pressure switch, according the operating temperature located
on the chart above.
5 Replace the chiller’s right-side panel and reapply main power.
Operating Low Low
Temperature Cut In Cut Out
45°F 35# 25#
40°F 30# 20#
35°F 25# 16#
30°F 20# 12#
NOTE: For chiller operation
below 45°F {7.2°C}, the
chiller’s control must
be
configured properly. Contact
Conair Service.
✐
CAUTION: 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.
NOTE: The high and low pres-
sure switches are enclosed
inside the same module.
✐
IMPORTANT: A correct mixture of
glycol and water must be used as
process coolant for operation below
45°F {7.2°C}.
See Installation sec-
tion entitled, Filling the Chiller.
Cut-out adjustment
Cut-in adjustment