5
U.L. Caution
This pump has been tested using water only. Its suitability for use with liquids other than
water is the end user’s responsibility.
Incorrect Installation Do not mount in these orientations
Pump Mounting Positions fig. 3
Correct Installation
8. Close the shut-off valve on the inlet side of the pump and turn the water supply to
the house back on.
9. Flush system of debris.
Before reattaching the pump motor, open the shut-off valve on
the inlet side of the pump housing and let water flow through the housing. Use a bucket to
catch the water. Let the water run long enough to clear all sand, solder pellets, plumbers
tape flakes, etc. from the lines. Close the inlet shut-off valve when finished.
10. Connect the pump motor to the housing.
Make sure the rubber o-ring is in place
in the housing and the screw ring is securely hand tightened (for 303 models) or that the
top housing screws are firmly in place and tightened (909 models).
Reopen the shut-off
valve or valves and let the water flood the pump housing.
11. Purge air from the supply line.
Turn on the faucet or shower farthest from the water
heater. Open the line until you get a good, steady stream of water without sputter or evi
-
dence of air.
12. Purge air from the return line.
Connect the pump to the electrical supply. With the
pump running, open the hose bib and let water run until the pump is running quietly and
there is no sputtering or other evidence of air coming from the hose bib. Close the hose
bib. Your system is now in operation. Allow a few minutes for instant hot water to recircu
-
late to all of your faucets.
SAFETY PRECAUTION:
Remove the handle from the hose bib(s) to prevent a small child
from mistaking it for a cold water faucet.
Insulating
both the hot water supply and recirculation lines is strongly recommended.
13. If you have an SMT or UCT timer pump,
set your timer in accordance with the in
-
structions on the following page.
4
Or, if the Rotor/Im-
peller cannot be
removed using
forefinger and thumb,
carefully lever off
evenly with two
screwdrivers.
4. Shut off the water to the house.
5. Drain the plumbing lines
by opening the faucets in the house. Drain the water heater
if you plan to make the connection at the botom of the water heater, which requires re
-
moval of the drain valve.
6. Connect the return line at the last faucet riser and run to the water heater.
Tee the
return line as close to the end of the hot water supply line as possible and run the return
line back to the water heater.
7. Install the pump and other compo-
nents required
in accordance with the
diagrams provided in fig. 1 or 2 and con
-
nect the return line to the water heater
(also see fig. 3).
For SM(T) and UC(T) 303 Models
Check pump operation before you
begin.
Unscrew the pump housing from
the motor (fig. 4) and run the pump
for a few seconds to make sure it is
operational. Remove the rotor (see fig.
5) and add a little water to the bearing
ball for lubrication. Do not use
grease or oil to lubricate the pump.
Fig. 5
303-Models - Rotor/Impeller Installation:
To remove the rotor unit, grasp the top of the unit
and gently pull straight up. Do not pull up on one side only or push the rotor sideways. If the
rotor sits too tightly, carefully lever it off with a screwdriver on each side of the rotor. When re-
installing the rotor, use enough force to hear the rotor “click” on to the ceramic bearing and spin
the rotor with your fingers to insure that it turns freely.
For SM(T) - 909 Models
This unit may be installed into the pipe system without disassembling the pump.
However, it is recommended that the motor section be disassembled from the pump
housing by removing the two pump housing screws so that the system may be flushed as
noted in paragraph 9.
Remove the Ro-
tor/Impeller by using
forefinger and thumb
and pulling upward.
Fig. 4
Remove the mo-
tor unit and
o-ring from the
pump housing
into the plumbing
line. Do not
sweat the housing
into the plumbing
line with the motor
or o-ring attached.
Arrows on the
pump housing
indicate the direc
-
tion of water flow.
Caution: Only hand tighten the screw ring. Do not over
tighten! Do not use plumbers putty on the screw ring.
Ultracirc Models
The UC and UCT-303 models incorporate a shut off valve and check valve into the brass
pump housing eliminating the need to install these components.
These models are supplied with 1/2” union fittings. These fittings should be removed from
the pump housing before soldering to avoid damaging the internal valves.
Shut-Off Valve (allows isolation of water in the tank in the event of pump servicing).
Hose Bib (allows venting of air from system at start-up).
Auto Air Vent (allows continuous venting of air bubbles that intrude into all hot water circu
-
lating systems during operation).