©2001 Thermaco, Inc. All rights reserved • Patented/Patents Pending • Specifications subject to change without notice
Thermaco, Inc. • 646 Greensboro St. • Asheboro, N. C. 27204-2548 • Phone (336) 629-4651
MNL-AST 18
®
AST
Timer Setup Instructions
NOTE: IN CASE OF POWER FAILURE, RESET TIMER. (See Step 2 above).
After the plumbing installation is complete, the Big Dipper AST needs to be set for the proper
automatic self-cleaning operation for the facility. The W-300-AST through W-1000-AST are
equipped with a 24 Hour/96 Event time controller. The time controller for models W-750-AST and
W-1000-AST is located under the lid of the motor housings mounted to the side of the Big Dipper
AST tank (See Pages labeled "Electrical Connection Detail" sketches of this location).
To allow the most efficient automatic cleaning cycle, the system should be set to operate during
a time when there are no (or low) drainage flows passing through the system. The Big Dipper W-
300-AST and W-500-AST are factory preset to operate the automatic cleaning cycle from 4:00 a.m.
to 5:00 a.m. The Big Dipper models W-750-AST and W-1000-AST are factory preset to operate the
automatic cleaning cycle from 4:00 a.m. to 6:00 a.m. each day of the week.
Depending upon the amount of accumulated grease and oils, the system may need to be reset to
operate more or less time to skim all separated grease and oils. This can be determined by
removing the top cover and observing the depth of the separated grease layer shortly after a
cleaning cycle is completed. This layer should not be more than 1/4" thick. If the layer of the W-
300-AST through W-1000-AST is consistently more, increase the operating times by 30 minutes for
each additional 1" of grease not to exceed 2 hours in a complete run cycle. If required, additional
run cycles can be added throughout the day.
TO SET TIMER:
1.
Push on/off tabs on the outer ring
of timer inward into dial at desired
"ON"
times. 1 Tab = 15 minutes. Minimum of
two (2) tabs (30 minutes) recommended.
2.
Turn dial
CLOCKWISE
one
or more complete revolutions until the
present time is aligned with the time-of-
day indicator point.
3.
Plug Big Dipper AST into grounded
electrical outlet before applying power.
Ensure the unit is filled with water.
3
2
1
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
Tabs punched in
indicate "ON"setting
Time-of-day
indicator point
Tabs
NOT punched in
indicate "OFF" setting
