OVERVIEW
This section deals with the Precision and
Paragon Defrost Timers. When used, these
Time Clocks handle defrost periods of 2 hours
or less. Cycles requiring longer defrost
periods must be controlled through supple-
mental time clocks. Hussmann's Electronic
Defrost Time Clock carries its own manual.
Specific guidelines for setting the Ti m e
Clocks are in “Control Settings.” General
instructions are handled here.
PRECISION DEFROST TIMER
Three main sets of components are involved
in setting up a defrost program for the system.
These are:
1. Program Timer Dials rotate once in
2 4 hours and are slotted at one hour
increments. The field technician will insert
a tripper each time a defrost cycle is to
start in the 24 hour clock day.
2. Cycle Timer Dials rotate each defrost
cycle and stop in refrigeration. The field
technician will set the length of each
defrost cycle from 2 to 120 minutes.
3. The Time Setting Dial rotates once every
24 hours and appears to be 7 hours ahead
of the Program Timers. This time
difference compensates for the location of
the defrost switches and the pointer
marked TIME. The field technician will
set the Time Setting Dial at the approxi-
mate time of day.
Setting Precision Defrost Timer
Setting Defrost Start Times
Rotate the Program Timer Dials by turning the
setting knob at the end of the Timer opposite
the Motors. As the Dial slots for start of
defrost become accessible, install a tripper for
each desired time start. The slot for each
tripper time is located immediately a b o v e
its number on the dial face.
To install a tripper, push straight in until it
snaps over its holding detent. A p r o p e r l y
installed tripper has its shoulders extended
1
⁄32 inch above the dial face, and is square to it.
A misaligned tripper can jam the timer.
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 • Printed in USA
Revised August 1, 1996 P/N 340272A
6 - 1
MECHANICAL DEFROST TIMERS
Figure 6-2 Proper Installation
To Next Page
Loading...
