OPERATION
CAUTION:
Never operate the system “dry” or permanent damage may occur to the circulator. Never shut off the
water supply or restrict flow in any way while the circulator is operating.
1. Verify water is present at the circulator.
2. Verify the power cord is plugged into an appropriate household electrical receptacle.
3. To continuously run the circulator or test for initial operation, set the manual override switch to the “ON” position
and verify the circulator operates smoothly and quietly.
4. To prevent circulator operation, such as for extended periods that the residence will be vacated, set the manual
over ride switch to the “OFF” position.
5. For normal automatic operation, set the clock/timer as required and move the manual override switch to the
“AUTO” position.
Manual Override
Switch Positions
OFF
ON
AUTO
SETTING THE CLOCK/TIMER
1. Rotate the dial in a clockwise direction until both the time shown,
and the appropriate AM or PM indicator, correspond to the current
time of day. (This adjustment is required for initial operation,
following a power interruption, to adjust for daylight savings time,
or for periodic time correction.)
2. Remove the clear plastic cover from the dial.
3. The outer ring of the dial has an adjustable tab for each 15 minute
time interval of a 24 hour day. To enable circulator operation for a
specific time interval, slide the corresponding interval tab to the
outer position. All tabs positioned toward the center of the dial
disable circulator operation for those time intervals
.
4. Verify the manual override switch is in the “AUTO” position.
5. Replace the clear plastic cover on the dial.
Dial
Interval Tabs
(15 minutes each)
For maximum energy savings, set the timer to:
a) Activate the circulator at least ½ hour before initial hot water
demand for the day is anticipated.
b) Deactivate the circulator when the anticipated hot water
demand for the day ends.
SETTING THE VALVE
The Astro Express LF valve is factory set to suit most applications. The valve may be easily
adjusted to suit application conditions and personal preferences.
1. To increase the water temperature at the hot-water tap, turn the flowrate adjustment counter
clock-wise one or two increments.
2. To decrease the water temperature at the cold-water tap, turn the flowrate adjustment
clock-wise one or two increments.
3. To completely stop flow through the valve, turn the valve completely closed by turning the
flowrate adjustment fully clockwise.
If necessary to achieve the desired water temperature control, set the circulator timer to cycle
the circulator on/off during the anticipated hot water demand period, in combination with valve
adjustment.
Allow ample time (at least several hours) after valve or timer adjustment, for the system
temperature to stabilize, prior to evaluating the result of the adjustment.
Manual Override
Current Time
AM/PM Indicators
Flowrate
Adjustment Screw
Page 4 of 5
