Precision® Instruction Manual
(Model 188 has a double configuration of the above.)
Setting Thermostat: A reference dial is provided to correlate thermostat setting with temperature readings taken from the
NOTE: Reference dial numbers are for reference only and are not val-
ues for water temperature within the unit.
To determine what temperatures may be expected from various settings on the dial, select an arbitrary setting of"4" by
turning the control knob in a clockwise direction. (With warmer water, a higher setting may be necessary.) With the dial
set at "4" or higher, the neon-glow pilot lamp is energized. Temperature equilibrium will be indicated by a steady cycling
of this lamp from "On" to "Off" approximately every minute. At this point, a temperature reading should be taken from
the thermometer and noted.
It is suggested that the above procedure be repeated at progressively higher settings on the reference dial. Approach all
settings in a "clockwise" direction. This means that when changing from a high setting to a lower one, the control knob
should be turned back past the lower setting desired and then approached in a "clockwise" direction.
Cleaning: To remove algae and to clean the bath, a detergent solution is recommended. Should algae or any other un-
desirable microorganisms form on top of the bath media, add a little formaldehyde or zephiran chloride to alleviate this
WARNING: Unit must be disconnected from power source prior to
servicing. It is recommended that all service be performed by
qualified service personnel.