Harwil Q-5 Installation Instructions Manual

MODEL Q-5

Q-5, Q-5SS, QD-5, QD-5SS

INSTALLATION INSTRUCTIONS

SPDT 15A MICROSWITCH 125/240 VAC (2 REQ'D FOR QD-5)
DRY CIRCUIT MICROSWITCH SPDT 0.1A 125 VAC (OPTIONAL)

3 WIRES W/ CRIMPED TERMINALS (6 TERMS. ONLY QD-5)

2 SCREWS, NUTS & LOCKWASHERS

HARWIL CORPORATION

541 KINETIC DRIVE, OXNARD, CA 93030

TEL: [phone] FAX: [phone]

EMAIL: [e-mail]

TERMINAL STRIP
(NOT SUPPLIED WITH QD-5)

COVER CASTING,

SEAL, SCREW ASSEMBLY

CABLE STRAIN RELIEF

DRAG DISK 1
DRAG DISK 2
DRAG DISK 3
DRAG DISK 4
DRAG DISK 5
DRAG DISK 6

GASKET

BODY CASTING

BRACKET
2 SPACERS
2 SCREWS & LOCKWASHERS

LEADSCREW

LEADSCREW NUT

SPRING
LARGE SPRING

LID CASTING
7 SCREWS & LOCKWASHERS

CLAMP WASHER
3 SCREWS & LOCKWASHERS

FEED THRU SHAFT ASSEMBLY
MODEL Q5/3
MODEL Q5/5
MODEL Q5/7

This parts list applies to all models of Q-5 and QD-5 fluid flow switches: Q-5/3, Q-5/7, QD-5/7.

All letters and numbers added to model number after the above numbers apply to optional drag strips

and electrical strain relief connectors.

PARTS LIST

FLUID FLOW SWITCH

ULTRA RELIABLE SINCE 1956 P. 1

5D

2D

TURBULENT
FLOW REDUCTION

MOUNT IN
THREE POSITIONS

HARWIL CORPORATION

541 KINETIC DRIVE, OXNARD, CA 93030

MODEL Q-5

Q-5, Q-5SS, QD-5, QD-5SS

TEL: [phone] FAX: [phone]

EMAIL: [e-mail]

INSTALLATION AND OPERATING INSTRUCTIONS

The gasket seal located between the main body casting and the lid casting is a cork-rubber composi­tion, which is subject to a slight creep for a short period after application of the initial clamping load.
All gaskets are properly clamped before shipment, however during shipping and storage, the gasket
may compress, allowing the body-lid clamp bolts to become slightly loose. Tighten these bolts before
assembling the flow switch in-system. No further creep of gasket will occur after second tightening. The
Q-5 fluid flow switch is supplied with a male 1” NPT which is threaded into an appropriate pipe tee,
large pipe with reducer bushing, or directly into a hole threaded 1” NPT in the wall of the pipe. Turn
until tight and arrow on body casting is pointed in direction of flow.

ELECTRICAL WIRING

FIGURE 1: Wiring schematic for power applied to load when flow is GREATER than the set point (pow­er to load interrupted when flow is LESS than set point).

INCREASING FLOW MOVES
ACTUATOR IN DIRECTION SHOWN

NC (ORANGE)

NO (WHITE)

COM (BLACK)

MICROSWITCH

(HOT)

TERMINAL STRIP

LOAD

LINE

FIGURE 2: Wiring schematic for power applied to load when flow is LESS than the set point (power to
load interrupted when flow is GREATER than set point).

DECREASING FLOW MOVES
ACTUATOR IN DIRECTION SHOWN

NC (ORANGE)

NO (WHITE)

LOAD

MICROSWITCH

COM (BLACK)

ULTRA RELIABLE SINCE 1956P. 2

TERMINAL STRIP

(HOT)

LINE

MODEL Q-5

Q-5, Q-5SS, QD-5, QD-5SS

Q-5 FLOW SWITCH OPERATIONAL ADJUSTMENT

REMOVE COVER

LEADSCREW

MICROSWITCH

HARWIL CORPORATION

541 KINETIC DRIVE, OXNARD, CA 93030

TEL: [phone] FAX: [phone]

ADJUST LEADSCREW

BEST ADJUSTMENT POINT
(CENTERED)

SPRING POSITION
WHEN DELIVERED

EMAIL: [e-mail]

SWITCH POINT ADJUSTMENT

1. Remove cover.

2. Adjust fluid flow in system to desired rate WITHOUT regard to Q-5 switch point setting.

3. The switch point adjusting mechanism consists of an adjusting screw, a “U” shaped lead screw nut,
and a helical spring.

CLOCKWISE rotation of the adjusting screw changes the microswitch actuation point toward HIGHER
flow rates.

NOTES: All Q-5 units are factory set at the lower end of the flow range, e.g. the adjusting screw is set
at the low flow counter-clockwise position.

The lead screw nut locks the adjusting screw in position, maintaining the flow switch set point under all
environmental conditions.

4. Turn the adjusting screw in a clockwise direction until the microswitch is actuated, while maintaining
the desired fluid flow rate in the system. Turn the adjusting screw TWO (2) additional turns in the
clockwise direction and then slowly back off in a counter-clockwise direction, until the microswitch
is again actuated. The Q-5 flow switch is now set for maximum sensitivity for detecting small flow
changes.

5. When set for maximum sensitivity (100% point) as described above, flow turbulence may cause
rapid on/off switching (dithering) of the microswitch contacts, resulting in reduced switch contact life

ULTRA RELIABLE SINCE 1956 P. 3