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2. Select a suitable location for system installation. Typically, the Astro
system is mounted near the hot water heater. The inlet is connected to a
return line from the furthest hot water tap in the system. The discharge is
connected into the hot water heater drain line.
3. Ensure the following conditions are met when the system is mounted:
i.
The circulator shaft is horizontal.
ii. The clock/timer face is accessible for viewing and adjustment.
iii. The direction of water flow matches the arrow on the circulator casing.
iv. The piping is sufficiently rigid to support the system in operation.
v. Neither the clock/timer nor black terminal box is under the circulator.
4. The Astro system is shipped fully assembled and tested to suit either down
discharge orientation with the clock timer facing up, or horizontal discharge
with the clock timer facing the water supply side. For alternate orientation, see
ROTATING THE CIRCULATOR CASING.
Top Timer
Access,
Down
Discharge
Timer/Discharge
Orientation
(as shipped)
Side Timer
Access,
Horizontal
Discharge
5. Connect the hot water return line to the circulator, verifying proper flow direction.
FLOW
Fig. 1 Astro 2 Series circulator and 24-Hour Timer assembly drawing
Fig. 2 Astro 2 Series circulator and 24-Hour Timer wiring diagram
TIMER
WHITE
WH
ITE
WHITE
GREEN
GREEN
BLACK
BLAC
K
BLAC
K
BLAC
K
BLACK
G
Green Ground
Screw in timer box
F
L
O
W
AQUASTAT
TIMER
WHITE
WHITE
WH
IT
E
WHITE
BLACK
BLACK
BLAC
K
BLAC
K
BLAC
K
BLACK
GREEN
G
Green Ground
Screw in timer box
Fig. 3 Astro 2 Series circulator and 24-Hour Timer and Aquastat Control wiring diagram
