DAYLIFF MJ User manual

WATER METERS
Installation &
Operating Manual
MJ
PD
WP

SPECIFICATIONS
1.
1
2.
SYMBOLS & WARNINGS 3
INDEX
© Davis & Shirtliff Ltd 2020
Contents herein are not warranted
3. INSTALLATION 4
4. OPERATION & MAINTENANCE 7
5. TERMS OF WARRANTY 9

1
1. SPECIFICATIONS
The various Dayliff water meter types are robust and economical designs for
monitoring residential, commercial and agricultural consumption. All meters are
remote monitoring enabled and pulse cables are available on request. Sizes are
available from DN15 to DN100 in three different ranges as follows:-
MJ
A high precision and reliable multi jet dry type water meter designed for general
water supply metering applications. It features magnetic drive for lower
transmission resistance, a magnetic shield for external magnetic field protection
and a sealed dry dial to ensure clear and easy reading. The body is made from
composite plastic for DN15 and DN20 sizes and brass for larger sizes. Meters are
supplied with inlet strainers and union connectors.
PD
Rotary piston type meters that provide high accuracy over a wide flow range. The
mechanical transmission movement provides reliability and the liquid sealed
register provides easy and clear reading. Meters are fitted with internal strainers,
non return valves and union connectors and the bodies are made from composite
plastic (15mm size) and corrosion resistant steel for other sizes.
MJ PD WP
Congratulations on selecting a Dayliff Water Meters. They are
manufactured to the highest standards and if installed and operated
correctly will give many years of efcient and trouble free service.
Careful reading of this Installation Manual is therefore important,
though should there be any queries they should be referred to the
equipment supplier.

PERFORMANCE DATA
2
WP
A heavy duty meter with flange connections for bulk flow applications featuring
magnetic drive, a dry dial for clear reading and a removable measuring
mechanism that can be maintained without removing the meter body. The body is
made from cast iron with epoxy coating.
DIMENSIONS AND WEIGHTS
MJ PD WP
3
Rated Flow (m /hr)
3
Max. Flow (m /hr)
Min. Flow (l/hr)
Pressure Rating (bar)
0
Max. Operating Temp ( C)
Max. Pipe Size
Pressure Loss at Rated Flow (bar)
Pressure Loss at Max. Flow (bar)
3
Max. Reading (m )
15
1.5
3
30
16
99999.999 9999.9999 999999
40
0.2
1
15
1.5
3
15
10
40
0.2
1
20
2.5 6 103.5
512 20
7
50 120 200
70
16 16 1616
40 40 4040
0.25 0.24 0.2 0.25
1 1 0.9 1
1
20
2.5
5
25
16
40
0.25
1
50
15
30
7.5
16
50
2”
0.02
0.08
65
25
50
12.5
16
50
2½”
0.015
0.08
80
40
80
20
16
50
3”
0.034
0.015
100
60
120
30
16
50
4”
0.038
0.125
25 32 40
1½”½” ½”¾” ¾”
1¼”
Body thread (D)
Connector thread (d)
Flange size (mm)
Body Length, L (mm)
Overall Length, L1(mm)
Height, H (mm)
Width, W (mm)
Weight with connectors (kgs)
15
½”
-
115
209
96
96
0.6
MJ PD WP
15
½”
-
165
259
106
98
0.7
20
1” 1½” 2”
- - - -
190 260 260 300
1”
294 380 384 431
98 98 98 122
107 118 118 142
0.8 2.9 3.7 6.1
20
1”
-
130
234
96
96
1.48
50
-
-
165
200
-
256
165
12
65
-
-
185
200
-
185
266
13
80
-
-
200
225
-
276
200
16
100
-
-
220
250
-
286
220
18
25 32 40
1½”
¾”
¾”
1
¼”
1
¼”
¾”
Accuracy Class B C B

3
L
H
nxM
DN
D1
D
L
L1
W
D
d
H
15mm
MJ
L
W
D
d
L1
PD WP
2. SYMBOLS & WARNINGS
WARNING
Service lines, valves, connections and meters must be
water tight.
WARNING
Check local codes and regulations before the meter is
removed for service, replacement, or installation.
Settings must be checked for electrical continuity
through the service pipe (provided the pipe is metallic).
CAUTION
Instructions should be carried out by a qualified
professional with parts/ equipment approved by the
local codes and regulations.
WARNING
Meter must not be used as a lever or crowbar to
straighten misaligned piping.
WARNING
Meter shall not be set into a meter opening which is too
long or force the piping into place with the coupling
nuts on the meter setting. This can cause serious
damage to the threaded ends of the meter and to the
meter itself
NOTE
Indoor residential meters may be located in basements,
crawl spaces, utility rooms or in a garage.

4
NOTE
The meter installation should include a valve
downstream from the meter to prevent water loss
during meter servicing or removal from the line.
NOTE
The system should be installed so that the meter can be
read at a convenient outdoor location. For meters that
are located indoors, a remote reading system is
recommended. This eliminates access problems and
avoids customer complaints concerning strangers
entering the home.
WARNING
Before starting any disassembly operation, the water
line must be depressurized. Removing a meter that is
under line pressure can result in serious personal injury
ŸThe meter is a precise measuring device and although robust in design
and construction, should be handled, transported, and installed with
care. The meter should remain within its protective packaging to the point
of installation.
ŸStorage temperatures shall remain within the range of -20°C to +60°C ,
avoiding direct sunlight.
ŸSpecial fittings and accessories are available to provide easier meter
installation and proper alignment.
ŸAll meters should be installed according to local standards or water utility
regulations.
ŸClose the meter's inlet-side valve.
ŸOpen a faucet and wait until water flow stops to depressurize the system.
Do not remove the meter until the flow stops.
ŸCheck valves and make necessary repairs to shut-off valve or inlet side
valve if necessary.
ŸFor proper sealing, use new meter gaskets when changing the meter.
ŸDo not use thread sealant, pipe dope or meter coupling threads, meters
are sealed by the gasket only.
ŸClose the meter's outlet-side valve. Protect the floor below the meter
against potential spills or leaks that could occur. Protect the coupling area
from debris so that the new meter will not be contaminated or damaged.
3. INSTALLATION

45
Fig 1
MJ/PD Meter Installation
ŸWhen replacing an existing water meter, loosen meter couplings and
remove the meter and the old gaskets in the coupling nuts.
ŸClean the coupling nuts, removing any dirt from the threads.
ŸVerify the existing setting for proper alignment and spacing. Correct any
misalignment and spacing in the setting.
ŸPlace the connection gaskets inside the connection coupling nuts. Use
rubber gasket hardness of 80-90 Shore A.
ŸSet the meter between the coupling nuts, properly positioned so that the
flow indication/arrow on the meter housing points in the direction of flow.
ŸStart the coupling nuts at the threaded meter ends. Verify that the coupling
nuts are properly aligned to avoid cross threading damage (stripping) to
the meter ends. This is especially important for the engineered
composite/polymer meter.
ŸThe best method for properly starting meter coupling nuts is to position the
nuts squarely against the meter end. Turn the nut counterclockwise (in
reverse) while holding the nut against the meter end. When the first
threads on both the coupling nut and the meter spud end coincide, a
slight click will be heard and the movement of the nut into the starting
position will be felt. At this point, turn the nut clockwise to complete the
connection.
ŸIn a good installation, this can be accomplished by turning the nut by
hand until it is tight. When firmly hand tight, apply an additional ¼ to ½
turn using an open-end wrench with a short handle.
WARNING
DO NOT over tighten.
Coupling Gasket
Coupling Nut
Meter
Tail Piece
PD/MJ Water Meter

46
Fig 2
ŸAfter installation is complete and prior to opening the upstream/inlet
water valve ensure that the valve on the downstream/outlet side of the
meter is shut.
ŸIn case the main/service shut-off valve is closed, open it slowly to
pressurize the service line to the meter setting. Air in the lines may damage
a meter and other equipment. Water hammer from a quick turn-on can
damage plumbing and appliances or cause a water line rupture.
ŸSlowly open the inlet side valve which will fill the meter with water. Once
the water is flowing fully open the meter inlet valve . Partially open valves
can render the meter inaccurate and lead to low water pressure.
ŸCheck for leaks around the meter and connections. Open a
downstream/consumer faucet to allow entrapped air to escape once the
outlet valve is opened. Open the meter outlet side valve slowly to
pressurize the downstream/ consumer side of the system. Turn off the
consumer faucet when normal water flow occurs.
ŸEnsuring that all consumer faucets are shut, observe the low flow detector
in the meter to identify downstream leaks in the consumer's system.
WP Installation
ŸThe meter must be installed with the direction of the flow as indicated by
the arrow cast in the meter body.
ŸIn order to keep the water meter in good working condition, the pipeline
should be cleared before installation.
ŸA horizontal position with the register face upwards is recommended.
ŸThe meter must have 10 diameters straight pipe ahead of the meter and 5
diameters straight pipe after to ensure proper flow through the meter.
ŸThe valves must be installed in the front and the back of the water meter.
ŸAttention should be paid that a cold water meter must not be used for hot
water..
Ÿ It is recommended to install a filter before water meter.
WARNING
The meter can be damaged if subjected to full ow
conditions prior to expelling all the air from the
pipeline.

7
ŸProvide an upstream and downstream shut-off valve of high quality and
with low pressure drop. A valve before the meter will allow local shutoff of
the water if change or repair is later needed. A valve or check valve on the
outlet side of the meter will keep water from draining from the building
when changing or removing the meter.
ŸProvide a drain cock between the meter and the downstream valve.
ŸIn general, install the meter horizontally in the line to obtain optimum
performance as shown in Fig 2. Volumetric meters may also be installed
vertically or at an incline.
ŸEnsure that the installed meter will be easily accessible for reading,
inspection, and service.
ŸProtect the meter and piping against flooding, mechanical damage and
tampering.
ŸThe installed meter must not be an obstacle or a hazard to the customer or
interfere with public safety.
ŸAlways flush the upstream and downstream piping prior to installation.
Ensure that the water in the pipes is completely free of debris.
4. OPERATION AND MAINTENANCE
1257
( Figure one )
6
Inlet
43234
5
67
≥5D ≥10D
1. Water meter
2. Nut
3.Gasket 1
4. Gasket 2
5. Pipeline
6. Gasket 3
7. Screw
WP Bulk Water Meter
Fig 3

8
NOTE
Standard water meters are for cold potable water.
Enquire for hot water (temperatures greater than
50°C).
Correct Wrong
ŸMost meters are rated to 16 bar. If there is a pressure regulator, verify that
the regulator works and is adjusted correctly.
ŸThe service pipe entering and exiting the meter box should be properly
bedded to ensure that it is not axially misaligned. Ensure that pipe
alignment is maintained so that the service pipe or meter will not be
damaged by eventual ground shifts.
Fig 4

9
ii) Standard Warranty
General Terms
If equipment failure occurs in the normal course of service having been
competently installed and when operating within its specified duty limits
warranty will be provided as follows:-
• Up to six months - The item will be replaced or repaired at no
charge.
• Over 6 months, less than one year - The item will be replaced or
repaired at a cost to the customer of 50% of the Davis & Shirtliff
market price.
The warranty on equipment supplied or installed by others is conditional
upon the defective unit being promptly returned free to a Davis &
Shirtliff ofce and collected thereafter when repaired. No element of site
repair is included in the warranty and any site attendance costs will be
payable in full at standard chargeout rates. Also proof of purchase including
the purchase invoice must be provided for a warranty claim to be
considered.
5. TERMS OF WARRANTY
i) General Liability
• In lieu of any warranty, condition or liability implied by law, the liability of
Dayliff in respect of any defect or failure of equipment supplied is limited to
making good by replacement or repair (at the Company's discretion)
defects which under proper use appear therein and arise solely from faulty
design, materials or workmanship within a specified period. This period
commences immediately after the equipment has been delivered to the
customer and at its termination all liability ceases. Also the warranty period
will be assessed on the basis of the date that the Company is informed of
the failure.
ŸThis warranty applies solely to equipment supplied and no claim for
consequential damages, however arising, will be entertained. Also the
warranty specifically excludes defects caused by fair wear and tear, the effects
of careless handling, lack of maintenance, faulty installation, incompetence
on the part of the equipment user, Acts of God or any other cause beyond the
Company's reasonable control. Also, any repair or attempt at repair carried
out by any other party invalidates all warranties.

INS450A-02/20
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