Harwil Q-8DS Installation Instruction Sheet

MODEL Q-8DS

INSTALLATION INSTRUCTION SHEET

STRAIN RELIEF NUT

GROMMET ‘A’

GROMMET ‘AA’

GROMMET ‘B’

GROMMET ‘C’

SWITCH COVER

4 RETAINING SCREWS

(NOT SHOWN)

“F” COVER

O-RING

BODY, COMPLETE WITH

FEED THRU SHAFT ASSEMBLY

(SEE PARTS LIST)

HARWIL CORPORATION

541 KINETIC DRIVE, OXNARD, CA 93030

TEL: [phone] FAX: [phone]

EMAIL: [e-mail]

“F” COVER TO SUIT CUSTOMER

SUPPLIED FITTING FOR ½”

FLEXIBLE CONDUIT

MICROSWITCH COMPLETE
W/ 2 SLIP-ON TERMINALS

SCREW x ¾” LG
NUT
PLAIN WASHER
SPLIT LOCKWASHER

1” NPT

DO NOT ATTEMPT TO REMOVE

DRAG STRIP WITHOUT FIRST

GRIPPING SEAL SHAFT TO

PREVENT BREAKING OF SEAL

BY UNTHREADING FROM FEED

THRU SHAFT.

FLUID FLOW SWITCH

PARTS LIST

SCREW x 7/8” LG
NUT
PLAIN WASHER
SPLIT LOCKWASHER

DRAG STRIP
CLAMP WASHER
DAMPENER WASHER
SCREW x 3/8” LG
2 PLAIN WASHERS
SPLIT LOCKWASHER

2D

5D

TURBULENT
FLOW REDUCTION

MOUNT IN
THREE POSITIONS

ULTRA RELIABLE SINCE 1956 P. 1

HARWIL CORPORATION

541 KINETIC DRIVE, OXNARD, CA 93030

MODEL Q-8DS

TEL: [phone] FAX: [phone]

EMAIL: [e-mail]

INSTALLATION INSTRUCTIONS

Model Q-8DS is normally mounted in a 1½” x 1½” x 1” or 2” x 1” SST PVC Tee, which may be
plumbed into the system in vertical or horizontal lines, right side up or inverted using normal PVC
pipe cement. Make sure that flow direction arrow on the cover is aligned with the flow in the pipe.

An unmounted Q-8DS should be threaded into the 1” NPT stem of the Tee after checking for uniform
coating of threads with Teflon tape. Tighten sufficiently to produce a leak-tight seal and continue tight­ening up to one full turn to align flow direction arrow on cover parallel with flow axis of Tee. Check
through open end of Tee that drag strip moves freely and is perpendicular to the flow axis. Install in
pipe with flow direction arrows pointing correctly in flow direction.

ELECTRICAL WIRING

1. Remove strain relief nut, grommet, and switch
cover.

2. Strip outer jacket of electrical cord back ap­proximately 1¼”, stagger ½” and strip leads
¼”.

3. Remove slip-on connectors from microswitch
terminals and crimp or solder to leads.

4. Feed cable through strain relief nut, grommet,
and cover.

5. Apply slip-on connectors to appropriate termi­nals of microswitch. Slide cover down cable
and fasten to body with 4 screws. Slide grom-

1¼”

¼”

½”

met down cable until small end is level with
outer jacket. Push grommet into tapered hole
of cover, hold cable jacket to prevent rotation
and tighten strain relief firmly.

6. If type “F” cover is supplied, connect desired
conduit fitting to cover. Prepare leads, attach
to slip-on connectors per STEP 2 and apply
to appropriate microswitch terminals. Attach
electrical conduit-to-conduit fitting. Exercise
reasonable care when assembling metal flex­ible conduit to prevent fracture of plastic cover.
Rigid conduit is not recommended.

WIRING SCHEMATIC

Contacts are closed when flow rate is above
microswitch set point (15-20 GPM). Power to load
interrupted when flow decreases below this point.

INCREASING FLOW MOVES
ACTUATOR IN DIRECTION
SHOWN

NC

NO

HOT

COM

MICROSWITCH

ULTRA RELIABLE SINCE 1956P. 2

LOAD

LINE