Harwil Q-8CR Installation Manual
MODEL Q-8
Q-8CR
INSTALLATION INSTRUCTION SHEET
HARWIL CORPORATION
541 KINETIC DRIVE, OXNARD, CA 93030
TEL: (805) 988-6800 FAX: (805) 988-6804
EMAIL: HARWIL@HARWIL.COM
GROMMET ‘A’
GROMMET ‘AA’
GROMMET ‘B’
GROMMET ‘C’
LEADSCREW
LEADSCREW NUT
ADJUSTING SPRING
BODY
1¼” x 1” BUSHING
SUPPLIED
STRAIN RELIEF NUT
COVER
4 RETAINING SCREWS
(NOT SHOWN)
MICROSWITCH 15A SPDT
WITH 3 SLIP-ON TERMINALS
DRY CIRCUIT SPDT 0.1A 125 VAC
MICROSWITCH
MICROSWITCH BRACKET
WITH SPRING LEVER
2 SCREWS
2 NUTS
2 SPLIT LOCKWASHERS
1 PLAIN WASHER
O-RING
2 SCREWS
NOTE: SEAL SHAFT MUST BE
GRIPPED DURING REMOVAL OR
INSERTION OF DRAG DISK ARM.
FAILURE TO GRIP SHAFT SECURELY
WILL CAUSE LEAKAGE OF INTERNAL
ELASTOMER SEAL.
2D
5D
TURBULENT
FLOW REDUCTION
MOUNT IN
THREE POSITIONS
SEAL SHAFT ASSEMBLY
SUPPLIED ONLY COMPLETE WITH
A) SEAL SHAFT
B) DIAPHRAGM
C) DIAPHRAGM WASHER
D) FEED THRU SHAFT
DRAG DISK ARM #1 (SMALL)
DRAG DISK ARM #2 (MEDIUM)
DRAG DISK ARM #3 (LARGE)
NOTE
GRIPPING
FLATS
SCREW
DRAG DISK #1 (SMALL)
DRAG DISK #2 (MEDIUM)
DRAG DISK #3 (LARGE)
PARTS LIST
FLUID FLOW SWITCH
ULTRA RELIABLE SINCE 1956 P. 1
HARWIL CORPORATION
541 KINETIC DRIVE, OXNARD, CA 93030
MODEL Q-8
Q-8CR
TEL: (805) 988-6800 FAX: (805) 988-6804
EMAIL: HARWIL@HARWIL.COM
INSTALLATION AND OPERATING INSTRUCTIONS
The Q-8CR fluid flow switch is supplied with a 1¼” x 1” Fortron TT bushing threaded in place with 2 to 3 wraps of Teflon
tape, which must be intact or renewed if bushing and switch are separated before assembly. Care must be exercised when
threading the bushing into plastic or metal fittings. Apply a minimum of 2 to a maximum of 3 wraps of Teflon tape to threads
of bushing - this is especially important if the unit is to be used in metal fittings where coarse METAL THREADS could gall
plastic if not lubricated. The plastic bushing CAN BE CRACKED if the main body of the flow switch is tightened into it FIRST.
Cracking will not occur if the bushing is FIRST tightened into the pipe or tank fitting and THEN the Q-8CR body is tightened
into the bushing.
1. Teflon tape the thread and tighten plastic bushing into pipe or tank fitting.
2. Teflon tape the thread and tighten Q-8CR switch into PLASTIC bushing by applying wrench to hexagon section.
Repeat steps 1 and 2 until ARROW on body points in the DIRECTION OF FLOW and threads are leak tight.
3. Inspect to make sure drag disk does not touch opposite wall of small diameter pipe.
Plumbers’ tools such as pipe wrenches are not recommended. If possible, use a “Rigid” type wrench where the smooth jaws
closely fit the hexagon section.
ELECTRICAL WIRING
1. Remove gland nut, grommet, and switch cover.
2. Strip outer jacket of electrical cord back approximately
1¼”. Strip insulation from individual conductors back
approximately ¼”
3. Slip on terminals are supplied with each switch. Remove
from switch terminals and crimp on or solder to electrical
leads.
4. Feed electrical cable through gland nut, grommet, and
1¼”
¼”
Fig 1: Wiring schematic for power applied to load when
flow is less than set point (power to load interrupted when
flow increases to above set point).
Decreasing flow moves actuator in direction shown.
DECREASING FLOW MOVES
ACTUATOR IN DIRECTION
SHOWN
LOAD
switch cover as shown.
5. Apply slip on terminals to appropriate contacts of
microswitch. Slide cover down cable and fasten to body
of switch with four (4) screws provided. Slide grommet
down cable until outer jacket is level with small end of
grommet. Push grommet into tapered end of cover. Hold
cable jacket to prevent rotation and thread gland nut
firmly onto cover.
Fig 2: Wiring schematic for power applied to load when
flow is greater than set point (power to load interrupted
when flow decreases to below set point).
Increasing flow moves actuator in direction shown.
INCREASING FLOW MOVES
ACTUATOR IN DIRECTION
SHOWN
LOAD
MICROSWITCH
NC
NO
COM
HOT
ULTRA RELIABLE SINCE 1956P. 2
LINE
MICROSWITCH
NC
NO
HOT
COM
LINE
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