Grundfos MQ 3-35 User manual

MQ
Installation and operating instructions
GRUNDFOS INSTRUCTIONS
Available From:
www.RainHarvest.com

LIMITED WARRANTY
Products manufactured by GRUNDFOS PUMPS CORPORATION (Grundfos) are warranted
to the original user only to be free of defects in material and workmanship for a period
of 24 months from data of installation, but not more than 30 months from data of manu-
facture. Grundfos’ liability under this warranty shall be limited to repairing or replacing
at Grundfos’ option, without charge, F.O.B. Grundfos’ factory or authorized service
station, any product of Grundfos’ manufacture. Grundfos will not be liable for any costs
of removal, installation, transportation, or any other charges which may arise in connec-
tion with a warranty claim. Products which are sold but not manufactured by Grundfos
are subject to the warranty provided by the manufacturer of said products and not by
Grundfos’ warranty. Grundfos will not be liable for damage or wear to products caused
by abnormal operating conditions, accident, abuse, misuse, unauthorized alteration or
repair, or if the product was not installed in accordance with Grundfos’ printed installa-
tion and operating instructions.
To obtain service under this warranty, the defective product must be returned to the
distributor or dealer of Grundfos’ products from which it was purchased together with
proof or purchase and installation date, failure date, and supporting installation data.
Unless otherwise provided, the distributor or dealer will contact Grundfos or an author-
ized service station for instructions. Any defective product to be returned to Grundfos or
a service station must be sent freight prepaid; documentation supporting the warranty
claim and/or a Return Material Authorization must be included if so instructed.
GRUNDFOS WILL NOT BE LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES,
LOSSES, OR EXPENSES ARISING FROM INSTALLATION, USE, OR ANY OTHER CAUSES. THERE
ARE NO EXPRESS OR IMPLIED WARRANTIES, INCLUDING MERCHANTABILITY OR FITNESS
FOR A PARTICULAR PURPOSE, WHICH EXTEND BEYOND THOSE WARRANTIES DESCRIBED
OR REFERRED TO ABOVE.
Some jurisdictions do not allow the exclusion or limitation of incidental or consequential
damages and some jurisdictions do not allow limit actions on how long implied warran-
ties may last. Therefore, the above limitations or exclusions may not apply to you. This
warranty gives you specific legal rights and you may also have other rights which vary
from jurisdiction to jurisdiction.

3
MQ
Installation and
operating instructions
Page 4

4
CONTENTS
Page
1. General description 4
1.1 Applications 4
1.2 Type key 4
1.3 MQ pump 5
2. Pumped liquids 5
3. Technical data 5
3.1 Operating conditions 5
3.2 Electrical data 6
3.3 Dimensions 6
3.4 Approvals 6
4. Functions 6
4.1 Control panel 6
4.2 Pump stop 8
5. Mounting and connection 8
5.1 Mounting the pump 8
6. Electrical connection 9
6.1 Generator or inverter 9
6.2 Wiring diagram 10
6.3 Winding resistance measurement 10
6.4 Start-up 11
7. Maintenance 11
7.1 Service kits 11
7.2 Start-up after a long time of inactivity 11
8. Service 11
9. Disposal 11
10. Fault finding chart 12
Dimensions 35
Before beginning installation procedures,
these installation and operating instruc-
tions should be studied carefully. The instal-
lation and operation should also be in
accordance with local regulations and ac-
cepted codes of good practice.
1. General description
The MQ is a compact water supply system consisting
of a pump, motor, pressure tank and controller com-
bined in an integral unit.
The pump starts automatically when water is con-
sumed in the installation and stops when the con-
sumption ceases. The MQ is a low-noise pump which
can be installed both indoors and outdoors.
Note: When installed outdoors the MQ should not be
exposed to direct sunlight or rain.
The pump is self-priming and has a check valve incor-
porated in the discharge port, see fig. 1. The pump
features a user-friendly control panel.
The pressure tank incorporated in the pump reduces
the number of starts and stops in case of leakage in
the installation.
The MQ pump has built-in overtemperature and dry-
running protection.
1.1 Applications
Typical applications:
• Water pressure boosting
(maximum inlet pressure: 45 psi) and
• water supply from wells (maximum suction lift:
25 ft), e.g.
- in private homes,
- in summer houses and weekend cottages,
- on farms,
- in market gardens and other large gardens.
The pump can be used for rain water and has been ap-
proved for drinking water.
The maximum suction lift of the pump can be deter-
mined from the diagram on page 35.
Example:
If the suction lift is 10 ft, the length of the suction
pipe must not exceed 72 ft.
1.2 Type key
Example MQ 3 -35 A -O -A BVBP
Pump type
Nominal flow rate [m³/h]
Head [m]
Code for pump version
A: Standard
Code for pipework connection
Code for materials
A: Standard
Code for shaft seal

5
1.3 MQ pump
Fig. 1
2. Pumped liquids
Thin, clean, non-aggressive liquids, not containing
solid particles or fibres.
3. Technical data
3.1 Operating conditions
TM01 9873 2600
Suction port
Drain plug
Base plate
Priming plug
Discharge port Pressure tank
Control panel
Plug
MQ 3-35 MQ 3-45
Maximum flow rate [gpm] 22
Maximum pressure [psi] 51 65
Maximum system pressure [psi] 108
Maximum suction lift [ft], see page 35 25
Minimum ambient temperature [°F] 32
Maximum ambient temperature [°F] 113
Minimum liquid temperature [°F] 32
Maximum liquid temperature [°F] 95
Net weight [lbs] 29
Sound pressure level [dB(A)] < 70
Tank volume [oz] 5
Air pressure in tank [psi] 22 to 25
Connections 1" NPT

6
3.2 Electrical data
3.3 Dimensions
See dimensions at the end of these instructions.
3.4 Approvals
Materials in contact with the pumped liquid have
been approved by the British Water Regulations
Advisory Scheme (WRAS) according to BS 6920 for use
in drinking water.
Other approvals: See pump nameplate.
4. Functions
4.1 Control panel
The MQ pump is operated entirely by means of the
control panel, see fig. 2. The control panel offers the
possibility of starting/stopping the pump. The pump
settings and operating condition are indicated by in-
dicator lights.
Fig. 2
MQ 3-35 MQ 3-45
Enclosure class IP 54
Insulation class B
Supply cable 6.56 ft H07RN-F with/without plug
Voltage,
power consumption, P1[W]
1 x 110-120 V –10/+6%, 60 Hz 800/7.2 A 1000/9.2 A
1 x 220-240 V –10/+6%, 60 Hz 850/3.7 A 1050/4.5 A
TM01 9684 2600

7
The functions of the control panel are described in the following table:
Note: The pump settings are stored. After supply failure, the pump will automatically revert to its previous oper-
ating condition when the electricity supply is connected again.
Illustration Description
1Indicator light (red):
When the indicator light is on, the pump is on standby.
2On/off button:
The pump is started/stopped by means of the on/off button.
The on/off button can also be used for manual resetting in case
of an alarm condition:
• press once for resetting and
• press once more for starting.
3Indicator light (green):
Indicates that the pump is ready for operation.
When the indicator light is on, the pump will start automati-
cally when water is consumed. The pump will stop a few sec-
onds after the water consumption has ceased.
4Pump on (green):
The indicator light is on when the pump is running.
5Auto-reset (green):
As standard, this function is activated on delivery (does not
apply to pump versions for Australia).
When the indicator light is
• on, the Auto-reset function is activated. The pump will auto-
matically attempt to restart every 30 minutes after an alarm/
fault over a period of 24 hours. After this period, the pump
will remain in the alarm condition.
• off, the Auto-reset function is deactivated. The pump will not
restart after an alarm/fault.
The Auto-reset function can be activated/deactivated by press-
ing the on/off button for 5 seconds.
Note: When water is consumed, the pump will start and stop
automatically, whether the Auto-reset light is on or off.
6Alarm (red):
The indicator light is on when the pump is in alarm condition.
The alarm condition may have been caused by:
• dry running,
•overtemperature,
• overloaded motor or
• seized-up motor/pump.
See section 4.2 Pump stop.

8
4.2 Pump stop
The pump incorporates an electronic protective func-
tion which will stop the pump in case of
• dry running,
• overtemperature,
• overloaded motor or
• seized-up motor/pump.
The pump will restart automatically after 30 minutes
(for 24 hours) in case of any type of fault if the Auto-
reset function is activated (the green indicator light
on the control panel is on, see point 5 in the table in
section 4.1 Control panel).
5. Mounting and connection
5.1 Mounting the pump
The pump is resistant to sunlight and can be installed
both indoors and outdoors. When installed outdoors,
it is recommended to protect the pump by means of a
suitable cover.
Always mount the pump on the base plate with hori-
zontal suction port and vertical discharge port.
The pump must be mounted horizontally.
Maximum permissible inclination angle: ±18°, see
fig. 3.
Fig. 3
The pump must be secured to a solid foundation by
bolts through the holes in the base plate, see fig. 4.
Fig. 4
The pump discharge is flexible, ±5°, to facilitate the
connection. Never apply unnecessary force when con-
necting the pipes.
The pump is supplied with 1" NPT screwed connec-
tions to be fitted in the suction and discharge ports,
see fig. 5.
Fig. 5
The pump incorporates a check valve which prevents
backflow during priming and operation.
Installations with long suction pipes: A check valve is
supplied with the pump. It is recommended to fit this
check valve in the pump suction port.
If the pump is installed in long pipes, the pipes must
be adequately supported on either side of the pump
in order not to strain the pump connections. If the
pump draws water from a well, it is recommended
also to fit a foot valve to the end of the suction pipe,
see fig. 6.
Fig. 6
If a hose is used for suction pipe, it must be of a non-
collapsible type.
As the pump is self-cooling, no space is required
around the pump and no ventilation is required.
TM01 9691 2600
TM01 9692 2600
Max. ±18°
7.5 inch
4.5 inch
TM01 9698 2600
TM01 9693 2600
Foot valve

9
6. Electrical connection
The electrical connections and additional protection
should be carried out by qualified persons in accor-
dance with local regulations.
The operating voltage and frequency are marked on
the nameplate. Make sure that the motor is suitable
for the electricity supply on which it will be used.
The pump must be connected to the mains via a rub-
ber-sheathed cable with a protective ground lead. It is
possible to replace the mains supply cable, see fig. 7.
Fig. 7
Connect the mains supply cable of the pump to the
electricity supply. When the cable is connected, a red
and a green indicator light on the control panel will be
on, see fig. 8.
Fig. 8
* Does not apply to pump versions for Australia.
6.1 Generator or inverter
Note: The MQ can be powered by a generator or an in-
verter. However, the pump will only operate satisfac-
torily if the generator or inverter generates a true
sinusoidal wave with the necessary power and volt-
age input.
Never make any connections in the
pump terminal box unless the elec-
tricity supply has been switched off for
at least 5 minutes.
Risk of electric shock: This pump is sup-
plied with a grounding conductor and
grounding type attachment plug. To
reduce the risk of electric shock, be cer-
tain that it is connected only to a
properly grounded electrical circuit
equipped with a ground fault inter-
rupter device.
This pump is not intended, nor has it
been investigated for use in swimming
pool areas.
This pump has been evaluated for use
with water only.
Do not start the pump until it has been
filled with water (primed, see fig. 9).
For indoor use only.
TM01 9694 2600
TM01 9695 2600
*

10
6.2 Wiring diagram
Fig. 9
6.3 Winding resistance measurement
The measurement can be done with or without cables connected to the PCB and the capacitor.
TM02 2424 4303
Capacitor
Electric motor
White (aux.)
Red (main)
Blue
Blue
Yellow/green
Yellow/green
Ground
P
h
ase
Neutral
Brown
Blue
O
range
Black
=> Mains
=> Flow sensor
=> Pressure switch
Red
Motor
[V/Hz] Measuring point Winding Resistance [Ω ±10%]
Ambient temperature
[°C] [°F]
230/50 A-B Main 6.4
21 70
230/60 A-C Aux 16.7
120/60 A-B Main 1.5
A-C Aux 6.1

11
6.4 Start-up
Before start-up, the pump must be filled with 1.2 to
1.5 gallons of water to enable it to self-prime, see fig.
10. The pump is self-priming with a maximum suction
lift of 25 ft.
Fig. 10
When the pump is started, it will begin to self-prime.
When the pump has been primed, it will automati-
cally change over to normal operation. If the priming
has not been completed within 5 minutes, the pump
will stop automatically and attempt to restart after
30 minutes. It is possible to reset the pump manually,
see point 2 in the table in section 4.1 Control panel.
7. Maintenance
Under normal operating conditions, the pump is
maintenance-free. However, it is recommended to
keep the pump clean.
If there is any risk of frost damage, drain the pump
through the drain hole and slacken the union nut on
the discharge pipe, see fig. 11. The pump must be
filled with liquid before it is started up again, see
fig. 10.
Fig. 11
7.1 Service kits
Service kits are available for the MQ pump. The ser-
vice kits consist of the following replaceable parts:
•shaftseal,
• motor,
• electronic units,
• hydraulic components.
7.2 Start-up after a long time of inactivity
The end cover incorporates a plug which can be re-
moved by means of a suitable tool. It is then possible
to free the pump rotor if it has seized up as a result of
inactivity. If the pump has been drained, it must be
filled with liquid before start-up, see fig. 10.
8. Service
Note: If a pump has been used for a liquid which is in-
jurious to health or toxic, the pump will be classified
as contaminated.
If Grundfos is requested to service the pump, Grund-
fos must be contacted with details about the pumped
liquid, etc. before the pump is returned for service.
Otherwise Grundfos can refuse to accept the pump
for service.
Possible costs of returning the pump are paid by the
customer.
However, any application for service (no matter to
whom it may be made) must include details about the
pumped liquid if the pump has been used for liquids
which are injurious to health or toxic.
9. Disposal
Disposal of this product must be carried out according
to the following guidelines:
1. Use the local public or private waste collection ser-
vice.
2. In case such waste collection service does not exist
or cannot handle the materials used in the prod-
uct, please deliver the product or any hazardous
materials from it to your nearest Grundfos com-
pany or service workshop.
TM01 9696 2600
Do not remove the pressure tank from
the pump unless it has been vented
through the air escape valve.
Never touch the electronics unless the
pump has been switched off for at least
5 minutes.
TM01 9697 4403

12
10. Fault finding chart
If the pump does not start when the fault has been corrected, contact your pump supplier or Grundfos for further
information.
Fault Cause Remedy
1. The pump does
not start.
a) Insufficient water. Check the water supply/suction pipe.
b) Overheating due to excessive liquid
temperature (above +95°F).
Supply cold liquid to the pump.
c) Overheating due to seized-up/
choked-up pump.
Contact your pump supplier.
d) Too low or too high supply voltage. Check the supply voltage and correct the
fault, if possible.
e) No electricity supply. Connect the electricity supply.
f) No water consumption. Open a tap. Check that the height between
the top point of the discharge pipe and the
pump does not exceed 50 ft.
g) The pump is in alarm condition. Reset the pump by means of the on/off
button. See point 2 in the table in section
4.1 Control panel.
2. The pump does
not stop.
a) The existing pipework is leaking or
defective.
Repair the pipework.
b) The check valve is blocked or missing. Clean the valve or fit a new check valve.
3. The pump cuts out
during operation.
a) Dry running. Check the water supply/suction pipe.
b) Overheating due to excessive liquid
temperature (above +95°F).
Supply cold liquid to the pump.
c) Overheating caused by:
- high ambient temperature (> 113°F),
- overloaded motor or
- seized-up motor/pump.
Contact your pump supplier.
d) Too low supply voltage. Check the supply voltage and correct the
fault, if possible.
4. The pump starts
and stops too fre-
quently.
a) Leakage in suction pipe or air in the
water.
Check the water supply/suction pipe.
b) Too low or too high pressure in pres-
sure tank.
Check pressure in pressure tank, see sec-
tion 3.1 Operating conditions.
5. The pump gives
electric shocks.
a) Defective ground connection. Connect the ground connection to the
pump in accordance with local regulations.
6. The pump starts
when no water is
consumed.
a) Defective check valve or the existing
pipework is leaking or defective.
Clean the valve or fit a new check valve.

13
11. MQ frequently asked questions
1. What causes the MQ to start?
Answer: The MQ is equipped with both an internal
flow switch and pressure switch. Each of these can
turn the MQ on depending on water consumption.
The pump will start when:
The flow rate is greater than 0.3 gpm
OR
the pressure is below 29 psi.
2. What causes the MQ to stop?
Answer: Other than the manual on/off button,
only the flow switch is authorized to automati-
cally stop the MQ during normal operation when
flow drops below 0.3 gpm. The pump will shut off
in 12-15 seconds after flow stops.
Additionally, the MQ will be turned off in the
event of a dry-run or over temperature alarm.
3. What is the maximum height of a tap above the
MQ?
Answer: If a tap or faucet is installed at heights
greater than 50 ft above the MQ, there is the po-
tential risk that the MQ will never start. In cases
where the MQ starts due to low pressure (low flow
rates), the pressure has to fall below the pressure
switch activation point (28-30 psi factory setting).
To allow for the pressure of 50 ft of water, toler-
ances and a safety margin, we recommend a maxi-
mum height of 50 ft between the MQ and any tap.
4. What is the purpose of the built-in pressure tank?
Answer: The built-in pressure tank comes from the
factory pressurized at approximately 23 psi (with
the pump pressure at zero), and holds a volume of
5 ounces of water. It is designed to minimize mo-
tor startup due to small leaks.
5. How is the dry-run condition determined?
Answer: The dry-run alarm is declared when the
motor is running AND the flow rate is less than
0.3 gpm AND when pressure is less than the pres-
sure switch setting. When this condition lasts for
1 minute, the alarm is declared and the motor is
stopped. The MQ attempts to automatically re-
start every 30 minutes for a maximum of 24 hours.
If more than 24 hours pass without water, the
pump must be restarted manually.
6. What is the maximum inlet pressure allowed in
the MQ?
Answer: For both MQ 3-35 and MQ 3-45 the maxi-
mum internal pressure allowed is 109 psi. The
maximum inlet pressure when added to the MQ
pressure must not exceed 109 psi.
Remember that inlet pressure adds to the MQ
pressure, so with a 40 psi inlet pressure supplied
to the MQ 3-45, internal pressures can reach ap-
proximately 105 psi (65 + 40 psi).
Additionally, if inlet pressures exceed the built-in
pressure switch activation point, (28-30 psi factory
setting) the pressure switch will be unable to acti-
vate, and the ability to turn the MQ on at low flow
rates will be lost. In this situation, only the flow
switch will be able to turn the MQ on at flow rates
above its activation point of 0.3 gpm.
7. Where can a pressure gauge be easily installed?
Answer: In the ½" straight thread opening used to
add priming water to the pump.
Subject to alterations.

14
Dimensions
Suction lift/suction pipe
TM01 9799 3300
9.44"
12.59"
7.5"
7.55"
22.44"
4.5"
8.58"
4 x 3/8"
TM02 8327 4903
0 10 20 30 40 50 60 70 80 90 100 110 120
0
4
8
12
16
20
24
28
[ft]
[ft]
Total vertical suction lift Hauteur d’aspiration verticale totale Altura de aspiración vertical total
Length of horizontal suction pipe
Longueur de la tuyauterie d’aspiration horizontale
Longitud de la tubería de aspiración horizontal

15
Exploded view
TM02 8410 5103
166
164
176a
161
176b 181
166a
184
165
185
187
186
160
152b
152c
168
7
11a
100
100a
100b
27
26
107
111
102
104
103
2
37a
180
40 40a
149
173a
173 52
51
169 152a
152
37a
4
37
49
66
67
6
37b
14
13
10
11
11b
16
11a
7
92
93
93a
94
150
53
91
101
185a
100c
174b
66a
174a
38
43
42
45
65
175
44 41
64
62
63
61
60 61a

16
Pos. pircseDnoitpircseD nóicpircseDnoit
2 Motor stoolwith base plate Lanternemoteur avec socle Soporte del motor con base
7 Priming plug Bouchon d’amorçage Tapón de cebado
14 Self-priming part Pièce d’auto-amorçage Pieza de autocebado
16 Pump sleeve Chemise de pompe Camisa de la bomba
42 Pressure tank Réservoirsous pression Tanque de presión
apaTelcrevuoCrevoC34
lanifapaTessacracaledétimértxErevocdnE15
acirótatnuJeuqirottnioJgnir-O35
65 Check valve Clapet anti-retour Válvula de retención
100a Discharge connection Raccord de refoulement Conexión de descarga
101 Inlet connection Raccord d’aspiration Conexión de aspiración
rodasnednoCruetasnednoCroticapaC161
174a Pressure switch Contacteur manométrique Presostato
181 Circuit board Carte de circuit imprimé Carta de circuito impreso
184Flowswitch cover Couvercle de l’interrupteur de
débit
Tapa del interruptor de caudal
185 Flow switch wheel Roue de l’interrupteur de débit Rueda del interruptor de caudal

U.S.A.
GRUNDFOS Pumps Corpo-
ration
17100 West 118th Terrace
Olathe, Kansas 66061
Phone: [phone]
Telefax: [phone]
Canada
GRUNDFOS Canada Inc.
2941 Brighton Road
Oakville, Ontario
L6H 6C9
Phone: [phone]
Telefax: [phone]
Mexico
Bombas GRUNDFOS de
Mexico S.A. de C.V.
Boulevard TLC No. 15
Parque Industrial Stiva
Aeropuerto
Apodaca, N.L. 66600
Mexico
Phone: [phone]
Telefax: [phone]
Addresses revised 18.04.2002

Being responsible is our foundation
Thinking ahead makes it possible
Innovation is the essence
www.grundfos.com
L-MQ-TL-001 Rev. 7/04
Printed in the U.S.A. US