Install Instructions

installation &
operating instructions
Astro 2 series
Hot water re-circulation system
4
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 suciently 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.
timer/discharge orientation (as shipped)
5 Connect the hot water return line to the circulator, verifying
proper flow direction.
6 Attach the Aquastat by the integral spring clip, to either
the circulator inlet or discharge piping, whichever is most
convenient. Ensure the concave sensor face of the Aquastat
remains in direct contact with the pipe surface.
7 Supply water to the system and inspect connections and
components for leaks.
8 In order to purge the air from the recirculation line:
i Make sure that the system is connected to the cold water
line and no fixtures are in use in the building.
ii Close the blow down valve.
iii Open the drain valve. Wait until all the air is purged from
the system and the water flow is steady through
the drain valve.
iv Close the drain valve.
Vent the circulator to remove trapped air:
v Place a one gallon or larger container under the circulator.
vi Loosen the brass plug in the end of the circulator with a
slotted screwdriver until water just begins to run out into
the container.
vii When the vented water is free of air bubbles, gently
retighten the brass plug until sealed.
viii Open the blow down valve.
The system is purged by air and ready for operation.
9 Verify that the timer’s manual override switch is in the
o position.
10 Plug the power cord into a standard 115 V ac electrical
receptacle.
11 To perform an initial system test for basic operation, see
Operation.
rotating the circulator casing
Prior to connecting the system to the hot water piping, if alter-
nate orientation of either the circulator discharge or clock timer
is required, proceed as follows:
1 Remove the four hex socket head screws that hold the cas-
ing to the circulator.
2 Gently pull the casing from the circulator body, taking care
not to damage the gasket or impeller.
3 Rotate the casing as required to meet circulator discharge
and clock timer orientation requirements.
4 Tighten the four hex socket head screws evenly, ensuring the
gasket seals the mating surfaces.
top timer access,
down discharge
side timer access,
horizontal discharge
cold water
supply line
hot water supply line
air vent (optional)
domestic hot
water return line
isolation valve
aquastat
timer
astro circulator
check valve
hose bib
(drain valve)
blow down valve
hot water
tank