Stuart Turner QT 50T User Manual

Installation, Operation & Maintenance
Instructions

Please leave this instruction booklet with the owner as it contains important
guarantee, maintenance and safety information

Read this manual carefully before commencing installation.

This manual covers the following products:

QT 50 S

Pt. No. 49007

QT 50 T

Pt. No. 49004

QT 80 S

Pt. No. 49008

QT 80 T

Pt. No. 49005

QT 120 S

Pt. No. 49009

QT 120 T

Pt. No. 49006

FOR POSITIVE HEAD APPLICATIONS ONLY

*2 year as standard extended to 3 years with a Techflange fitted

PRODUCT DESCRIPTION

Electric motor driven single or twin ended centrifugal pump, complete with an automatic
control system, consisting of flow switches and electronic controls.

APPLICATION

Techflow pumps are suitable for positive head installation conditions. The pumps are
designed for pressure boosting applications in vented stored hot or cold, clean fresh water
systems, where under gravity, some flow (1.0 l/min minimum) is available. Inlet pressures
to the pump and ambient temperatures must not exceed the values given in the technical
specifications.

 This pump set must not be used for any other application without the

written consent of Techflow Products and in particular, MUST NOT be
connected directly to the mains water supply.

 This appliance is not intended for use by persons (including children)

with reduced physical, sensory or mental capabilities, or lack of
experience and knowledge, unless they have been given supervision
or instruction concerning use of the appliance by a person responsible
for their safety.

 Children should be supervised to ensure that they do not play with the

appliance.

Please read installation details carefully as they are intended to ensure this product
provides long, trouble free service. Failure to install the unit in accordance with the
installation instructions will lead to invalidation of the warranty.

STORAGE

If this product is not to be installed immediately on receipt, ensure that it is stored in a dry,
frost and vibration free location in its original packaging.

CONTENTS

Page

Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Important Facts - read before commencing installation . . . . . . . . . . . . . . . . . . . . 4

Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Pump Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Electrical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Technical Specifi cation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Trouble Shooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Guarantee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

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CHECKLIST

22 mm inlet pipework

22 mm isolation valve
(non restrictive) (not
supplied).
To allow easy service
of pump

22 mm outlet pipework

22 mm inlet pipework

B

B

C

A

Fig. 1

Item

A

B

Description Qty

Pump 1 Outlet hose only 2
Inlet hose with isolating valve 2

Item

C

Your product may vary slightly from the picture above.

(Twin pump shown)

Description Qty

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1 READ BEFORE COMMENCING PUMP INSTALLATION

A. Water storage capacity.

1.11 The hot and cold water storage capacity must be sufficient to meet the flow rates
required by the pumped equipment and any other water using fittings and
appliances, which may be operated simultaneously.

1.12 Ensure the pump is primed as described in the priming section before starting,
damage to the shaft seal will result otherwise. See Section 5 - Commissioning.

B. Water temperature

The water entering the pump must be controlled as follows:

o

o

C.

C.

you must consult our

1.13 The maximum allowable water temperature is 65

1.14 The minimum allowable water temperature is 4

1.15 DO NOT fit a pump if the hot water is heated via a method where the water
temperature cannot be controlled, such as solar or solid fuel
helpline.

C. Minimum Flow

1.16 For this pump to operate correctly there must be a minimum gravity flow of at
least 1 l/min through all outlets to be pumped.

D. Pipework - General

1.17 Secure pipework: Ensure pipework to and from pump is independently
supported & clipped to prevent forces being transferred to inlet and outlet
branches of pump.

1.18 Flux: Solder joints must be completed and flux residues removed prior to pump
installation (flux damage will void any warranty).

1.19 Pipework design: Care should be taken in the design of pipework runs to
minimize the risk of air locks e.g. use drawn bends rather than 90

o

bends.

1.20 DO NOT introduce solder flux to flexible hoses, pumps or pump parts
manufactured from plastic.

1.21 DO NOT allow contact with oil or cellulose based paints, paint thinners or
strippers, acid based descalents or aggressive cleaning agents.

1.22 DO NOT install a non-return valve, or devices which contain non-return
valves, in the suction (inlet) pipework to the pump. The pump must be free
to vent to the supply tank at all times.

o

1.23 DO NOT bend the flexible hoses beyond 30

. They must be installed as

straight as possible..

1.24 DO NOT connect this pump to the mains supply or fit in an unvented

system.

E. Plumbing & Electrical Installation Regulations

1.25 The plumbing installation must comply with “The Water Supply (Water Fittings)
Regulations 1999” and “BS 6700” building regulations.

1.26 The plumbing installation must be installed by a qualified person.

1.27 The electrical installation must be carried out in accordance with the current
national electrical regulations.

1.28 The electrical installation must be installed by a qualified person.

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2 LOCATION - GENERAL

2.11 Access: For emergencies and maintenance the pump must be

easily accessible.

2.12 Protection: The pump must be located in a dry position, frost free and
protected from freezing, particularly when installed in a loft (not
recommended).

2.13 Ventilation: Ensure an adequate air flow to cool the pump. Separate
the pump from other appliances that generate heat. An 80 mm (3 “) air
gap must be maintained around the pump.

2.14 Safety: The motor casing can become very hot under normal
operating conditions. Care must be taken to ensure it cannot be
touched during operation.

2.15 Water retention: If possible site the pump in a location where in the
unlikely event of a water leak, any spillage is contained or routed to
avoid electrics or areas sensitive to water damage.

2.16 Static inlet pressure: Before deciding where to locate the unit check to ensure
the static inlet head between pump and cold water level (Figs. 2 & 3) is at least

0.5 metre and does not exceed the max inlet head of 8 metres.

2.17 Pump position: The pump must be positioned on its anti-vibration mounting
feet and as close to the water source as possible. Ensure the pump is mounted
in a position that allows easy access to the box if required.

2.18 Ambient temperature: The pump must be sited in a location where the maximum
ambient temperature does not exceed 40

2.19 Pipework: For optimum performance pipework MUST be 22 mm.
Pipework should only reduce to 15 mm when entering terminal fitting.

2.20 Static outlet pressure: The static outlet head (Figs. 2 & 3) must also be within
the maximum requirement of 8 metres.

2.21 Noise: The anti-vibration mounting feet and flexible hoses which are supplied
as standard, and a precaution to reduce noise transmission, however care must
be taken when mounting the pump that any noise is not amplified through loose
panels or pipework. Do not screw down the pump.

2.22 Flexible hoses: Use only Techflow supplied hoses.

2.23 Isolating valves: Separate isolating valves (non restrictive) must be fitted to
allow easy pump service.

2.24 Pump location: The pump location must be at floor level next to the hot water
cylinder or a level that is below the secondary tapping that feeds the pump. This
will ensure the pump has access to an air free water supply which is important for
trouble free operation, and never more than 4 metres from the hot water cylinder.

o

C.

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2 LOCATION - SINGLE PUMP

Static Inlet Pressure

Min. 0.5 m

Max. 8 m

Outlet head must be
below bottom of cold
water tank and able
to pass a minimum of
1 l/min of gravity flow

Positive Duty Single Pump System

Static Outlet Pressure

Max. 8 m

Fig. 2

2.25 The cold water supply: The supply must be air free and have a dedicated
connection to the tank which should be via a tank connector, positioned at a
slightly lower level (25 mm minimum) than the feed pipe to the hot water cylinder.
Do not connect to the mains.

2.26 Location: The pump must, for optimum performance, be sited as close as
possible to and never more than 4 metres from the HOT WATER cylinder. The
pump should always be sited BELOW the HOT WATER take-off from the cylinder.

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