Harwil Q-1 Installation Instructions Manual

MODE L Q -1

Q -1, Q D -1

INSTALLATION INSTRUCTIONS

HARWIL CORPORATION

541 KINETIC DRIVE, OXNARD, CA 93030

TEL: [phone] FAX: [phone]

EMAIL: [e-mail]

MICROSWITCH (2 REQ’D FOR QD-1)

SPDT 15A 125/250 VAC

DRY CIRCUIT MICROSWITCH SPDT 0.1A 125 VAC (OPTIONAL)

3 WIRES W/ CRIMPED TERMINALS (6 TERMINALS IN QD-1)

2 SCREWS, NUTS, AND LOCKWASHERS

LEADSCREW

LEADSCREW NUT

SPRING

DIAPHRAGM SCREW

DIAPHRAGM WASHER

DIAPHRAGM PISTON

ORIFICE PIN

BODY CASTING

BRACKET

TERMINAL STRIP (NOT SUPPLIED WITH QD-1)
2 SCREWS, NUTS, AND LOCKWASHERS

COVER CASTING
COVER SEAL AND SCREW ASSEMBLY

STANDOFF
2 SCREWS & LOCKWASHERS

UPPER BEAM ASSEMBLY
SCREW, NUT & LOCKWASHERS

LID CASTING
8 SCREWS & LOCKWASHERS

O-RING

ORIFICE

DIAPHRAGM RING

4 SCREWS & LOCKWASHERS

ROLLING DIAPHRAGM

GASKET

FEEDTHRU SHAFT ASSEMBLY

LOWER BEAM ASSY
SCREW, NUT & LOCKWASHER

CLAMP WASHER
3 SCREWS & LOCKWASHERS

2D

5D

PART SIDE VIEW

CABLE CONNECTOR

TURBULENT
FLOW REDUCTION

PARTS LIST

FLUID FLOW SWITCH

ULTRA RELIABLE SINCE 1956 P. 1

MOUNT IN
THREE POSITIONS

HARWIL CORPORATION

541 KINETIC DRIVE, OXNARD, CA 93030

MODE L Q -1

TEL: [phone] FAX: [phone]

EMAIL: [e-mail]

Q -1, Q D -1

INSTALLATION 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 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 your system.

No further creep of the gasket will occur after the second tightening. The Q-1 fluid flow switch is sup­plied with tapped holes for standard ½” pipe. Insert in line with arrow on the side of the casting point­ed in the direction of flow.

NOTE: Care should be exercised to prevent pipe thread sealant (putty, Teflon tape, etc.) from entering
the flow switch and restricting flow through the calibrated orifice.

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

LOAD

MICROSWITCH

NC (ORANGE)

NO (WHITE)

COM (BLACK)

ULTRA RELIABLE SINCE 1956P. 2

TERMINAL STRIP

(HOT)

LINE

MODE L Q -1

Q -1, Q D -1

Q-1 FLOW SWITCH OPERATIONAL ADJUSTMENT

REMOVE COVER

LEADSCREW

BEST ADJUSTMENT POINT (CENTERED)

HARWIL CORPORATION

541 KINETIC DRIVE, OXNARD, CA 93030

TEL: [phone] FAX: [phone]

EMAIL: [e-mail]

ADJUST LEADSCREW

MICROSWITCH

SPRING POSITION WHEN DELIVERED

SWITCH POINT ADJUSTMENT

1. Remove cover.

2. Adjust fluid flow in system to desired rate WITHOUT regard to Q-1 switch point setting.

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

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

NOTES: All Q-1 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 leadscrew 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-1 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