PROCEDURE
1. Timer installation and wiring.
WARNING:
Electrical shock hazard - Verify that the electrical rating of the device matches the values shown on the
nameplate of the circulator.
All electrical work should be performed by a qualified electrician in accordance with the latest edition of the
National Electric Code, local codes and regulations. Failure to follow these instructions could result in serious
injury, death and/or property damage.
Note:
Numerical component designations included in Steps “a” through “j” refer to circulator and timer
components shown in Fig. 1.
a. Unfasten the mounting screw (4A) and remove the terminal box cover (3).
b. Unfasten the mounting screw (4B) on the timer box cover (10) and detach it from the base (8).
c. Remove the original conductor (7A) from the circulator terminal box (2)
d. Fasten the connection adaptor (7B) to the circulator terminal box (2)
e. Fasten the threaded fitting (6) to the connection adaptor (7B)
f. Fasten the lock nut (5A) on the end of the threaded fitting (6) and insert the timer box (8)
g. Fasten the lock nut (5B) onto the end of the threaded fitting (6) so the timer box (8) is in between and
securely attached.
h. Connect timer lead wires (black, white and green) to the terminal box (as shown in Fig. 2).
i. Re-attach the timer box cover (10) using the mounting screw (4B). Insure that all lead wires are inside the
timer assembly.
j. Close the terminal box cover (3) by fastening the mounting screw (4A).
TIMER
WHITE
WHIT
E
WHITE
GREEN
GREEN
BLACK
BLACK
BLACK
BLACK
BLACK
G
Green Ground
Screw in timer box
Fig. 1 Astro 2 Series circulator and 24-Hour Timer assembly drawing
Fig. 2 Astro 2 Series circulator and 24-Hour Timer wiring diagram
2. To mount the Astro Express 2 circulator:
a) Turn off water supply. (If necessary, drain the hot water distribution pipes and partially empty the
water heater.)
b) Disconnect the hot water distribution pipe from the water heater outlet.
c) Connect the Astro Express 2 circulator inlet to the water heater outlet nipple.
d) Connect the distribution pipe to the circulator outlet.
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