Harwil Q-1 Service manual

ULTRA RELIABLE SINCE 1956 P. 1
MODEL Q -1 HARWIL CORPORATION
541 KINETIC DRIVE, OXNARD, CA 93030
TEL: [phone] FAX: [phone]
EMAIL: [e-mail]
Q -1, Q D -1
PARTS LIST
FLUID FLOW SWITCH
O-RING
ORIFICE
DIAPHRAGM RING
4 SCREWS & LOCKWASHERS
FEEDTHRU SHAFT ASSEMBLY
LOWER BEAM ASSY
SCREW, NUT & LOCKWASHER
CLAMP WASHER
3 SCREWS & LOCKWASHERS
ROLLING DIAPHRAGM
GASKET
LID CASTING
8 SCREWS & LOCKWASHERS
UPPER BEAM ASSEMBLY
SCREW, NUT & LOCKWASHERS
STANDOFF
2 SCREWS & LOCKWASHERS
ORIFICE PIN
BODY CASTING
DIAPHRAGM PISTON
DIAPHRAGM WASHER
DIAPHRAGM SCREW
SPRING
LEADSCREW NUT
LEADSCREW
PART SIDE VIEW
CABLE CONNECTOR
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
BRACKET
TERMINAL STRIP (NOT SUPPLIED WITH QD-1)
2 SCREWS, NUTS, AND LOCKWASHERS
COVER CASTING
COVER SEAL AND SCREW ASSEMBLY
TURBULENT
FLOW REDUCTION
MOUNT IN
THREE POSITIONS
2D
5D
INSTALLATION INSTRUCTIONS

ULTRA RELIABLE SINCE 1956P. 2
MODEL Q -1 HARWIL CORPORATION
541 KINETIC DRIVE, OXNARD, CA 93030
TEL: [phone] FAX: [phone]
EMAIL: [e-mail]
Q -1, Q D -1
INSTALLATION INSTRUCTIONS
ELECTRICAL WIRING
The gasket seal located between the main body casting and the lid casting is a cork-rubber composi-
tion 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 assem-
bling 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 sup-
plied with tapped holes for standard ½” pipe. Insert in line with arrow on the side of the casting point-
ed 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.
FIGURE 1: Wiring schematic for power applied to load when flow is GREATER than the set point (pow-
er to load interrupted when flow is LESS than set point).
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).
MICROSWITCH
TERMINAL STRIP
INCREASING FLOW MOVES
ACTUATOR IN DIRECTION SHOWN
COM (BLACK)
NC (ORANGE)
NO (WHITE)
(HOT)
LOAD
LINE
MICROSWITCH
TERMINAL STRIP
COM (BLACK)
NC (ORANGE)
NO (WHITE)
(HOT)
LOAD
LINE
DECREASING FLOW MOVES
ACTUATOR IN DIRECTION SHOWN

ULTRA RELIABLE SINCE 1956 P. 3
MODEL Q -1 HARWIL CORPORATION
541 KINETIC DRIVE, OXNARD, CA 93030
TEL: [phone] FAX: [phone]
EMAIL: [e-mail]
Q -1, Q D -1
Q-1 FLOW SWITCH OPERATIONAL ADJUSTMENT
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
ADJUST LEADSCREW
MICROSWITCH
SPRING POSITION WHEN DELIVERED
LEADSCREW
BEST ADJUSTMENT POINT (CENTERED)
REMOVE COVER

ULTRA RELIABLE SINCE 1956P. 4
MODEL Q -1 HARWIL CORPORATION
541 KINETIC DRIVE, OXNARD, CA 93030
TEL: [phone] FAX: [phone]
EMAIL: [e-mail]
Q -1, Q D -1
and “noise” in the electrical circuit. This is eliminated by turning the adjusting screw in a counter-
clockwise direction until the dithering is eliminated. This results in an operational switch point that is
slightly below the normal operating flow rate (80%) of the system. The operational set point is nor-
mally well below (i.e. 50% below) the most sensitive set point described in step 4. This eliminates
nuisance trips while detecting major reduction in the rate of flow. Care must be taken so as not to
set the operational switch point below the minimum flow requirements of the system. Refer to Figure
100%
80%
50%
LEADSCREW
BOTTOM OF LEADSCREW
50%
80%
100% ADJUSTED MAX SENSITIVITY
AS DESCRIBED IN 5.
REDUCED SET POINT TO
ELIMINATE DITHER AND
MAINTAIN SENSITIVITY
NORMAL SET POINT WHICH
ELIMINATES BOTH DITHERING AND
NUISANCE TRIPS WHILE PROVIDING
SAFE FLOW SIGNAL OUTPUT
FIG. 4
4 below.
6. Microswitch actuation point may be monitored during the adjustment procedure detailed in steps 4
and 5 by an audible click or with an ohmmeter before connecting line power to the terminal strip,
or by monitoring the voltage supplied to the load through the microswitch.
7. If the system flow rate is changed, the Q-1 can be adjusted to monitor the new flow rate by turning
the adjusting screw in a counter-clockwise direction to the minimum flow position and then proceed-
ing as in 4 and 5 above.

ULTRA RELIABLE SINCE 1956 P. 5
MODEL Q -1 HARWIL CORPORATION
541 KINETIC DRIVE, OXNARD, CA 93030
TEL: [phone] FAX: [phone]
EMAIL: [e-mail]
Q -1, Q D -1
NEXT SMALLER ORIFICE
ADJUSTMENT POINT
FLOW
MICROSWITCH
IF THE ADJUSTMENT POINT IS AT THE
BOTTOM OF THE LEADSCREW AND THE
SWITCH IS NOT ACTIVATED, REMOVE
ORIFICE AND REPLACE WITH NEXT
SMALLER ORIFICE.
NEXT LARGER ORIFICE
ADJUSTMENT POINT
REMOVE SCREWS
REMOVE LID
REMOVE ORIFICE
REMOVE PIN
MICROSWITCH
IF THE ADJUSTMENT POINT IS AT THE
TOP OF THE LEADSCREW AND THE
SWITCH IS NOT ACTIVATED, REMOVE
ORIFICE AND REPLACE WITH NEXT
LARGER ORIFICE.
FLOW
FIG 5A FIG 5B
ORIFICE CHANGE
NOTE: It is not necessary to remove the main body of the switch from the line to change the orifice.
1. Remove the cover.
2. Remove the lid casting from the main body casting.
3. Remove the 1/8” diameter orifice retaining pin.
4. Insert a small screw driver blade into the groove located in the exposed end of the orifice and pry
the orifice toward the body cavity. (FIG 6)
5. Drop the new orifice in the body cavity with the O-ring toward the upstream hole and press it into
place.
6. Insert the 1/8” orifice retaining pin. NOTE: Be sure to check that the pin is properly located in the
groove provided in the orifice.
WHEN THE ADJUSTMENT SPRING RUNS OUT OF TRAVEL OR ACTUATES AT EITHER END
OF THE LEADSCREW, YOU MUST CHANGE THE ORIFICE AND READJUST SWITCH.

ULTRA RELIABLE SINCE 1956P. 6
MODEL Q -1 HARWIL CORPORATION
541 KINETIC DRIVE, OXNARD, CA 93030
TEL: [phone] FAX: [phone]
EMAIL: [e-mail]
Q -1, Q D -1
ORIFICE SELECTION GUIDE
NO. 1
ID = 0.073
DRILL NO. 49
NO. 4
ID = 0.196
DRILL NO. 9
NO. 5
ID = 0.277
DRILL SIZE: 0.277( J )
NO. 6
ID = 0.375
DRILL SIZE: 3/8”
NO. 2
ID = 0.0935
DRILL NO. 42
NO. 3
ID = 0.149
DRILL NO. 25
0.12 GPM
1.5 GPM
0.25 GPM
3.0 GPM
0.50 GPM
4.0 GPM
1.00 GPM
8.0 GPM
2.0 GPM1.0 GPM
BLANK ORIFICE
DRILL TO SUIT CUSTOM
SWITCH POINT RANGE
DRILL ORIFICE AS REQUIRED
Model Q-1 is provided with blank orifices which can be drilled by the user to create customized flow
set-point ranges, as illustrated above.

ULTRA RELIABLE SINCE 1956 P. 7
MODEL Q -1 HARWIL CORPORATION
541 KINETIC DRIVE, OXNARD, CA 93030
TEL: [phone] FAX: [phone]
EMAIL: [e-mail]
Q -1, Q D -1
Q-1
# PART NAME QTY PART #
1 COVER CASTING (1) 20100
2 SCREW (1) 129-S
3 LOCK WASHER (1) 321-W
4 BRACKET (1) 20101
5 TERMINAL STRIP (1) 20102
6 SCREW (6) 111-S
7 WASHER (6) 322-W
8 NUT (6) 219-N
9 MICROSWITCH (1) 20103
10 SCREW (2) 116-S
11 WIRE (1) 20104
12 WIRE (2) 20105
13 WIRE (1) 20106
14 TERMINALS (3) 706-T
15 TERMINALS (3) 707-T
16 LEAD SCREW (1) 132-S
17 SHRINK WRAP (1) 901-F
18 LEAD SCREW NUT (1) 20107
19 SPRING (1) 20108
20 UPPER BEAM ASSEMBLY (1) 20109
21 SCREW (3) 103-S
22 LOCK WASHER (3) 323-W
23 NUT (3) 203-N
24 SCREW (2) 117-S
25 STAND OFF (2) 405-SP
26 LID CASTING (1) 20110
27 WASHER (1) 320-W
28 DIAPHRAGM - ROLLING (1) 20111
29 RING (1) 20112
30 LOWER BEAM ASSEMBLY (1) 20113
31 WASHER (1) 324-W
32 SCREW (3) 107-S
33 WASHER (7) 302-W
# PART NAME QTY PART #
34 FEED THRU SHAFT - ASSEMBLY ONLY (1) 20114
RUBBER (OPTIONAL) (1) 20134
PIN (1) 20135
35 SCREW (7) 107-S
36 WASHER (8) 319-W
37 SCREW (1) 134-S
38 CONNECTOR CABLE (OPTIONAL) (1) 20115
39 CONNECTOR CABLE (OPTIONAL) (1) 20116
40 CONNECTOR CABLE (OPTIONAL) (1)
BODY (1) 10429
NUT (1) 10430
GROMMET #A (OPTIONAL) (1) 10440
GROMMET #AA (OPTIONAL) (1) 10441
GROMMET #B (OPTIONAL) (1) 10442
GROMMET #C (OPTIONAL) (1) 10443
LOCK NUT (1) 101-DC
O-RING (1) 20117
41 GASKET (1) 20118
42 BODY CASTING (1) 20119
43 ORIFICE #1 (OPTIONAL) (1) 20120
ORIFICE #2 (OPTIONAL) (1) 20121
ORIFICE #3 (OPTIONAL) (1) 20122
ORIFICE #4 (OPTIONAL) (1) 20123
ORIFICE #5 (OPTIONAL) (1) 20124
ORIFICE #6 (OPTIONAL) (1) 20125
44 PIN/ORIFICE (1) 20126
45 O-RING (1) 20127
46 PIN - LOWER BEAM ASSEMBLY (1) 20128
47 WASHER - LOWER BEAM ASSEMBLY (1) 20129
48 PIN - UPPER BEAM ASSEMBLY (1) 20130
49 DIAPHRAGM (1) 20131
50 LABEL (1) 21136
40
49
41
45
43
44
42
39
31
33
32
33
621
30
22
23
46
29
47
28
27
21 34
38
36
37
36
35
26
1
2
3
50
14
13
11
12
16
17
4
5
7
8
24
22
6
25
10
21
22
23
48
20
9
19
18
15
7
8

ULTRA RELIABLE SINCE 1956P. 8 ULTRA RELIABLE SINCE 1956
CERTIFICATE OF CONFORMANCE
All Harwil Corporation (“HARWIL”) products are manufactured using new materials and components.
Our products meet the applicable performance and materials specifications indicated in our current
Specifications Sheets and Parts List. HARWIL endeavors to obtain its materials and components from
American Companies.
DOMINANCE OF HARWIL LIMITED EXPRESS WARRANTY
Each user MUST make appropriate analysis and tests to determine the suitability of the HARWIL product
for the intended use prior to purchase.
HARWIL warrants that all HARWIL products will be free from defects in material and workmanship for a
period of one year from the date of original shipment. This Warranty shall be LIMITED to the replacement
and reconditioning of our products and parts. HARWIL reserves the right and sole discretion to modify
or change the composition, design and appearance of its products at anytime.
THIS WARRANTY SHALL BE IN LIEU OF ALL WARRANTIES OF MERCHANTABILITY AND OF ALL WAR-
RANTIES OF FITNESS FOR A PARTICULAR PURPOSE RELATING TO HARWIL PRODUCTS AND PARTS.
BUYER’S SOLE REMEDY SHALL BE REPLACEMENT OR RECONDITIONING AS SET FORTH HEREIN.
HARWIL SHALL INCUR NO OBLIGATIONS HEREUNDER AND NO LIABILITY IN THE EVENT OF (1)
BUYER NOT FULFILLING ITS RESPONSIBILITIES; INCLUDING AS SET FORTH HEREIN; (2) NEGLECT,
ALTERATION OR IMPROPER PRODUCT USE, INCLUDING USE WITH NON-COMPATIBLE DEVICES OR
CHEMICALS; OR (3) REPAIR BY ANOTHER COMPANY OR PERSON THAN HARWIL.
ANY LAWSUIT RELATING TO THIS LIMITED EXPRESS WARRANTY MUST BE COMMENCED WITHIN
ONE YEAR OF THE DATE THE LAWSUIT ACCRUES.
HARWIL provides NO WARRANTY and ASSUMES NO RESPONSIBILITY for corrosive attack on
any material, component or design features associated with any of its products.
Corrosion resistance information listed in HARWIL specification sheets, information sheets and product
brochures is solely for general background information. This information table has been compiled from
literature published by various material suppliers and by equipment manufacturers who use these materi-
als in their products. Inasmuch as these data are based on tests by entities over which HARWIL has no
control, HARWIL DOES NOT GUARANTEE AND DOES NOT ACCEPT ANY RESPONSIBILITY FOR THE
ACCURACY OF SUCH THIRD PARTY TESTING. When using the table, please remember that in any
given case several factors such as concentration, temperature, degrees of agitation and presence of impu-
rities influence the rate of corrosion. The information table is intended, in a general way, to rate materials
for resistance to chemicals which contain their usual impurities and for types of equipment in common
use. Ratings should be used only as a general tool to first approximation of your material requirements
rather than as the final answer.
WHEN IN DOUBT, TEST MATERIALS BEFORE INSTALLATION.
AFTER INSTALLATION, FOLLOW UP WITH SCHEDULED PREVENTATIVE MAINTENANCE AND
PERIODIC INSPECTION.
16306