Cleaning The Nozzle / Venturi - North Star PA101 Manual

A clean nozzle and venturi is a must for unit to work right. This small unit moves brine from the brine tank to
the resin tank during regeneration. If it becomes plugged with sand, silt, dirt, etc., the softener will not work
and you will get hard water.
1" valve models use two different nozzle assembly designs. Figure 15 shows the assembly used on Model
PA071. All other models use the nozzle assembly in Figure 16.
Figure 15
To get to the nozzle venturi, remove the units' top cov-
er. Be sure the softener is in service cycle (no water
pressure at nozzle and venturi), then turn off the cap
from the nozzle and venturi housing. DO NOT LOOSE
THE LARGE O--RING SEAL. Lift out the screen sup-
port and screen, then the nozzle and venturi. Wash
and rinse the parts in warm water until clean. If need-
ed, use a small brush to remove iron or dirt. Also check
and clean the gasket and flow plug if dirty.
Carefully replace all parts in the correct order. Lubri-
cate the o--ring seal with silicone grease and place in
position. Install and tighten the cap, BY HAND ONLY.
DO NOT OVER TIGHTEN AND BREAK THE CAP OR
HOUSING.
Figure 16
NOZZLE ASSEMBLY
ALL MODELS EXCEPT
BE SURE THE SOFTENER IS IN SERVICE POSI-
TION (NO WATER PRESSURE AT NOZZLE AS-
SEMBLY).
1. Disconnect bottom tubing at the nozzle assem-
bly and turn nozzle housing out of nozzle and ven-
turi housing.
2. Turn nozzle out of nozzle housing. Remove ven-
turi with a long, needle--nose pliers, if needed (can
clean center hole of venturi without removing.
3. Clean parts in hot soapy water. Use a small wire
to clean holes in the nozzle venturi. USE EX-
TREME CARE NOT TO SCRATCH OR MIS-
SHAPE THE HOLES, OR SURFACES AROUND
THEM. Flush parts in fresh, clean water.
4. Reassemble all parts, being sure to seat the
nozzle and venturi in their respective locations.
DON'T OMIT THE O--RING SEAL ON THE
NOZZLE.
5. Replace the nozzle housing and reconnect the
tubing.
SERVICE INFORMATION
CLEANING THE NOZZLE & VENTURI
PA071
Cap
O- -ring Seal
Screen Support
Screen
Nozzle & Venturi
Gasket
IMPORTANT: Be sure small
hole in the gasket is centered
directly over the small hole in
the nozzle & venturi housing.
*Flow Plug
Nozzle & Venturi
Housing
brine return
line
pressure
side
24
NOZZLE ASSEMBLY
MODEL PA071
*INSTALL WITH
NUMBERED SIDE UP
CONCAVE SIDE DOWN.
Screen