Zip Varipoint III Assembly Instructions

VP303, VP503, VP803, VP953_Instructions. V1.04 Page 1 November / 2015
ZIP Varipoint III
Direct unvented water heaters
Models: VP303, VP503, VP803, VP953
Installation & User Instructions

VP303, VP503, VP803, VP953_Instructions. V1.04 Page 2 November / 2015
Installation & User Instructions
Index
Installation must only be undertaken by a competent person holding a current Registered
Operative Identity card for the installation of unvented domestic hot water storage systems
issued by an accredited body.
Please leave these instructions with the end user after installation.
General Product Description 3
Approvals 3
Technical Data 4
Dimensions 4
Safety Information 5
WARNINGS 5
CAUTIONS 6
Spare Parts 7
Components supplied with the unit for site fitting 7
Installation 8
Pipe fitting diagram 8
Requirements 9
Discharge 10-11
Positioning 12
Plumbing 12
Electrical 13
Commissioning & Operation 14
Inspection schedule 14
Maintenance 15
Draining 15
De-installation 15
Fault Finding 16
Warranty 17
Contents

VP303, VP503, VP803, VP953_Instructions. V1.04 Page 3 November / 2015
Approvals
Zip Varipoint III complies with LVD and EMC directives and is CE endorsed.
Zip Varipoint III has been examined, tested and found, when correctly tted, to comply
with the requirements of the United Kingdom Water Regulations/Byelaws (Scotland). The
product, therefore, is listed under the WRAS (Water Regulations Advisory Scheme) Water
Fitting and Materials Directory.
These instructions will guide you through the installation, maintenance and use of the
Zip Varipoint III, however, if you require any further information please call Zip customer
service on 0845 6 005 005 or 0345 6 005 005.
• The Zip Varipoint III is an unvented water heater designed for connection directly to
incoming mains water supply and can serve one or more outlets using conventional
taps.
• Care should be taken that the unit being chosen can meet the demands of the outlets
being supplied.
• The casing is constructed of powder coated steel and heat losses are minimised by the
high efciency CFC free polyurethane foam insulation.
• The inner vessel is constructed from heavy guage copper and pressure tested to 1.2
MPa (12 bar).
• A manually resettable safety cut out automatically cuts off the electrical supply to the
heating element in the event of a malfunction.
Description
If the hot water system is not used for two weeks or more, it is recommended
that a hot tap be turned on for several minutes at a sink, basin or bath, it is not
recommended that either a dishwasher, clothes washer or other appliance be used
before the heater is returned to service.
General Product Description
Technical Data
The Zip Varipoint III must be installed in accordance with these instructions and all
current legislation, codes of practice and regulations governing the installation of
unvented hot water cylinders in force at the time of installation.
To ensure you have the latest revision of this instruction manual, please visit
www.zipheaters.co.uk to download the latest copy.
Please contact Zip Customer Service for advice on 0845 6 005 005 or 0345 6 005 005

VP303, VP503, VP803, VP953_Instructions. V1.04 Page 4 November / 2015
Technical Data
Technical data
Zip Varipoint III
Model VP303 VP503 VP803 VP953
Declared load prole S M L L
Energy efciency class(1) C C C C
Energy efciency (ηwh)(1) [%] 32.5 36.6 37.3 37.3
Annual electricity consumption (1) [kWh] 568 1,401 2,748 2,746
Thermostat temperature setting 55°C 55°C 65°C 60°C
Specic precautions See installation and operating instructions
“Smart” value 0
Rated volume [l] 30.0 50.0 80.0 100.0
Mixed water at 40°C (V40)(2) [l] - 76.0 132.0 148.0
Weight empty / full [kg] 16.0 / 49.0 20.0 / 71.5 27.0 / 109.0 33.0 / 134.0
Power rating [W] 2,755
Nominal supply voltage [V~]230
Protection class IP24
Heat up time (10°C to 65°C) [mins] 46 72 115 141
Maximum working pressure [MPa] 0.55
Water connections 1/2” BSP
(1) EU Regulation 812/2013; EN 50440
(2) EN 50440
Controls: Pressure reducing valve and line strainer set to 0.35 MPa (3.5 bar)
Expansion relief and single check valve set to 0.6 MPa (6 bar)
Pressure and temperature relief valve set to 0.7 MPa ( 7 bar) and 90°C
Expansion vessel pre-charged to 0.35 MPa (3.5 bar)
Expansion vessel capacity: 5 litre - VP303, VP503
8 litre - VP803, VP953
A
(mm)
B
(mm)
C
(mm)
D
(mm)
VP303 376 460 430 448
VP503 564 648 430 448
VP803 705 786 485 503
VP953 850 931 485 503

VP303, VP503, VP803, VP953_Instructions. V1.04 Page 5 November / 2015
Safety Information
WARNING:
Indicates a potentially hazardous situation, which, if not avoided,
could result in death and/or serious injury and/or property
damage.
CAUTION: Indicates a potentially hazardous situation, which, if not avoided,
may result in property damage.
Safety Information
WARNINGS
• Installation, commissioning and maintenance of this appliance must only be carried
out by a competent installer, familiar with unvented systems who will then be
responsible for adhering to all relevant standards and regulations.
• The appliance must be permanently connected to the supply through an isolating switch
with a contact separation of at least 3mm in all poles.
• To protect the appliance, a circuit breaker must be fitted with a rating suitable for the
nominal current of the appliance.
• The cross sectional area of the connection cable must be appropriate for the power rating
and location of the appliance.
• The connecting cable must be adequately secured.
• This appliance must be earthed at all times.
• Check that the power supply is switched off prior to electrical connection.
• The appliance, its wiring and piping must not be modified in any way.
• Do not remove the electrical cover panel whilst the unit is connected to the electrical
supply.
• In case of malfunction isolate the power supply immediately. In case of leaks also
isolate the water supply. Repairs must only be carried out by Zip Heaters (UK) Ltd or an
authorised Zip service engineer.
• Do not reset the over temperature cut-out until the cause of its operation has been
diagnosed and necessary repairs have been undertaken.
• Do not use the water heater if it is suspected of being frozen. Switch off the electrical
supply if water ceases to flow and do not switch on again until a competent person has
checked that it is safe to do so.
IMPORTANT:
PLEASE READ THESE INSTRUCTIONS CAREFULLY.
NOTE THE SAFE OPERATIONAL REQUIREMENTS, WARNINGS AND CAUTIONS. USE THIS
PRODUCT CORRECTLY AND WITH CARE FOR THE PURPOSE FOR WHICH IT IS INTENDED.
FAILURE TO DO SO MAY CAUSE DAMAGE AND/OR PERSONAL INJURY, AND WILL
INVALIDATE THE WARRANTY. RETAIN THESE INSTRUCTIONS FOR FUTURE USE.

VP303, VP503, VP803, VP953_Instructions. V1.04 Page 6 November / 2015
Safety Information
Safety Information
CAUTIONS
• The appliance must only be used when correctly installed and in perfect working order.
• The appliance must be installed in a frost-free room and must never be exposed to frost.
• The Zip Varipoint range is not recommended for use with secondary circulation systems.
• The appliance must be completely lled with water before being switched on.
• The appliance must only be used for heating potable water. The appliance must not be
used for any other purpose.
• When the appliance has been in use for some time, the ttings may be very hot.
• The Zip Varipoint is intended for connection to mains supply only. In any other case
please contact Zip on 0845 6 005 005 or 0345 6 005 005 for advice.
• Zip Heaters (UK) Ltd cannot be held liable for any damages caused by failure to
observe these instructions.
• The heater should be visually inspected regularly. This is particularly important if the
heater is located in a cupboard, roof space or any other concealed location. If there is
any sign of leaks or seepage the heater should be isolated from the water supply and
switched off from the electrical supply until a competent person has investigated the
cause.
• Do not block or restrict the discharge from any safety valve.
• Do not tamper with any safety valve.
• The appliance must not be subjected to pressure exceeding 0.55 MPa (5.5 bar).
• If water discharges from any safety valve switch off the electrical supply to the unit,
isolate the water supply and contact a competent person familiar with unvented systems.
• Temperatures in excess of approximately 43°C are perceived as hot, especially by
children, and may cause a feeling of burning.
• This appliance must not be used by any person (including children) with limited
physical, sensorial or mental abilities or failing experience and/or knowledge unless they
are supervised by a person responsible for their safety or received instructions about how
to use the appliance.
• Children should be supervised in order to make sure that they do not play with the appliance.

VP303, VP503, VP803, VP953_Instructions. V1.04 Page 7 November / 2015
Spare Parts
Cold Inlet Set - Connections
Fig.1
Cold Mains In
Balanced Cold Take Off
Cold Supply To Cylinder
Internal Check Valve
Expansion Vessel Take Off
Discharge To Tundish
Expansion Relief Valve
Pressure Reducing Valve
(inc. Line Strainer)
Spare Parts
Part No. Description
VP0330 Element, plate & gasket
VP0331 Gasket
VP0332 Resettable cut-out
VP0333 Thermostat
VP0334 Neon indicator
AQ0317 Temperature & pressure relief valve
The Zip Varipoint III hot water cylinder will be delivered in its carton with the various control
valves and ttings supplied in a separate carton. Both should be left packed until needed.
Factory Fitted Components
• Heating elements.
• Thermostats with over temperature cut-outs.
• Temperature and pressure relief valve.
Componentssuppliedwiththeunitforsitetting
• Cold Inlet assembly comprising pressure
reducing valve with integral line strainer and
expansion relief valve with check valve,
expansion vessel take off and balanced cold
water take off. (See Fig.1)
• Expansion vessel and wall xing bracket.
• Zip Varipoint hot water cylinder wall locating
bracket.
• Tundish.
• Tee Piece & drain valve.

VP303, VP503, VP803, VP953_Instructions. V1.04 Page 8 November / 2015
Spare Parts Installation
1 Cold Main
2 Balanced Cold Connection
3 Expansion Vessel with Wall Bracket, from ‘cold inlet set’ take off
4Hot Water Outlet
5 Temperature Control
6 Neon Indicator
7Tundish To Drain
8 Temperature and Pressure Relief Valve
9Expansion Relief Valve To Drain Via Tundish
10 Check Valve
11 Pressure Reducing Valve
12 Isolating Valve (not supplied)
13 Tee Piece and Drain Valve
Pipettingdiagram
Warning!
Do Not Fit Isolation (Shut Off) Valve Between Cylinder and Expansion Valve.
8
1
2
3
4
5
6
7
9
10
11 12
13

VP303, VP503, VP803, VP953_Instructions. V1.04 Page 9 November / 2015
Installation
Requirements
Prior to installation the Zip Varipoint III should be kept upright in its original packaging and
handled with care always lifting from underneath.
The Zip Varipoint III should be stored in a covered, dry area protected at all times from the
weather.
These instructions must be read and fully understood before commencing the installation. If in
doubt, or in need of further guidance please ring Zip on 0845 6 005 005 or 0345 6 005 005.
Installation must only be undertaken by a competent person holding a current Registered
Operative Identity card for the installation of unvented domestic hot water storage systems
issued by an accredited body.
The Zip Varipoint III must be installed in accordance with these instructions and all current
legislation, codes of practice and regulations governing the installation of unvented hot water
cylinders in force at the time of installation.
All connections should be made to the Zip Varipoint III and its safety devices using the 15mm
or 22mm compression ttings, nuts and olives supplied.
The electrical installation including earthing and cross bonding must comply with the current
IEE regulations and any Local Authority requirements.
The cold water inlet set assembly comprises a pressure reducing valve with integral strainer,
expansion relief, check valve and expansion vessel. All of these components must be included
in the installation. The pressure settings on these components are factory set and indicated
on the top of the valve. Do not break any seals or attempt to adjust any safety valve; to do so
may impair the safety of the installation and will invalidate the warranty.
It is recommended that the unit is installed according to these instructions.
Under no circumstances should the expansion relief valve be installed in an inverted position
as fouling of the seat caused by deposits may prevent it from operating correctly.
Safety relief valve connections should not be used for any other purpose and no valve should
be tted between the expansion relief valve and the storage cylinder.
An isolating valve must be tted to the cold water supply to the inlet manifold.
The Zip Varipoint III is designed for use with a supply pressure up to 1.2 MPa (12 bar).
For supply pressures exceeding 1.2 MPa (12 bar) an additional pressure reducing valve must
be tted in the cold water supply to the unit.
Secondary Circulation
The Zip Varipoint III is not recommended for use with secondary circulation systems.
Installation
Installation

VP303, VP503, VP803, VP953_Instructions. V1.04 Page 10 November / 2015
Discharge
Discharge arrangement
The expansion relief, temperature and pressure relief valves should drain via a tundish which
should be installed in a visible location and away from any electrical devices.
The discharge pipe from the tundish should terminate in a safe place where there is no risk to
persons in the vicinity of the discharge, be of metal and:
a) Be at least one pipe size larger than the nominal outlet size of the safety device unless its
total equivalent hydraulic resistance exceeds that of a straight pipe 9m long. Discharge
pipes between 9m and 18m equivalent resistance length should be at least 2 sizes larger
than the nominal outlet size of the safety device, between 18 and 27m at least 3 sizes
larger, and so on. Bends must be taken into account in calculating the ow resistance.
See diagram of typical discharge pipe arrangement and table for sizing copper discharge pipe
on page 11.
b) Have a vertical section of pipe at least 300mm long, below the tundish before any elbows
or bends in the pipework.
c) Be installed with a continuous fall.
d) Have discharges visible at both the tundish and the nal point of discharge but where
this is not possible or it is practically difcult there should be clear visibility at one or other
of these locations. Examples of acceptable discharge arrangements are:
1. Ideally below a xed grating and above the water seal in a trapped gully.
2. Downward discharges at a low level: i.e. up to 100mm above external surfaces such as
car parks, hard standings, grassed areas etc. are acceptable providing that where children
may play or otherwise come into contact with discharges, a wire cage or similar guard is
positioned to prevent contact, whilst maintaining visibility.
3. Discharges at high level: e.g. into metal hopper and metal down-pipe with the end of the
discharge pipe clearly visible (tundish visible or not) or onto a roof capable of withstanding
high temperature discharges of water and 3m from any plastic guttering system that
would collect such discharges (tundish visible).
4. Where a single pipe serves a number of discharges, such as in blocks of ats, the number
served should be limited to not more than 6 systems so that any installation can be traced
reasonably easily. The single common discharge pipe should be at least one pipe
size larger than the largest individual discharge pipe to be connected. If unvented hot
water storage systems are installed where discharges from safety devices may not be
apparent e.g. in dwellings occupied by blind, inrm or disabled people, consideration
should be given to the installation of an electronically operated device to warn when
discharge takes place.
Note: The discharge will consist of scalding water and steam. Asphalt, roong felt and
non-metallic rainwater goods may be damaged by such discharges.
Note: It is not acceptable to discharge straight into a soil pipe. For guidance See G3 3.60
Installation
Installation

VP303, VP503, VP803, VP953_Instructions. V1.04 Page 11 November / 2015
Valve outlet
size
Minimum size
of discharge
pipe D1
Minimum size of
discharge pipe D2
from tundish
Maximum resistance allowed,
expressed as a length of
straight pipe
(i.e. no elbows or bends
Resistance
created by each
elbow or bend
G1/2 15mm
22mm up to 9m 0.8m
28mm up to 18m 1.0m
35mm up to 27m 1.4m
G3/4 22mm
28mm up to 9m 1.0m
35mm up to 18m 1.4m
42mm up to 27m 1.7m
G1 28mm
35mm up to 9m 1.4m
42mm up to 18m 1.7m
54mm up to 27m 2.3m
600mm
Maximum
Pipe Length
Safety device
e.g temperature
relief valve
Tundish
Metal Discharge Pipe (D2) From Tundish, with
Continuous Fall
Metal Discharge Pipe (D1) From Temperature
Relief Valve to Tundish, with Continuous Fall
Discharge Below
Fixed Grating
Trapped
Gulley
300mm
minimum Discharge below xed grating
(G3 3.62 gives alternative points
of discharge)
Note! The above chart is based on copper tube.
Plastic pipes may be of a different bore and resistance. Sizes and maximum lengths of plastic
should be calculated using data prepared for the type of pipe being used.
Diagram of a typical discharge pipe arrangement
Installation

VP303, VP503, VP803, VP953_Instructions. V1.04 Page 12 November / 2015
Positioning
The Zip Varipoint should be installed vertically with the electrical cover panel and water
connections underneath.
The unit is designed to be wall mounted using the wall xings supplied with the product.
Ensure that the wall where the unit is to be located is sufciently strong to support the full
weight of the unit (see dimensions) and capable of accepting suitable xings.
Position the Zip Varipoint III to allow for provision of the cold water supply, discharge ttings
and pipework as well as access for future maintenance, repair of the unit or its replacement.
Reasonable clearance will be required to give access to pressure controls, element assembly,
draining facility, pipe connections and expansion vessel.
A gap of 250mm should be left between the top of the unit and the ceiling. A gap of 400mm
should be left between the bottom of the unit and any oor or work surface.
Do not install in a location where the unit or connecting pipework can freeze.
Fix the Zip Varipoint III hot water cylinder locating bracket to the wall with suitable xings as
shown in the diagram and table of dimensions on page 3.
Position the Zip Varipoint III securely on the locating bracket.
The expansion vessel should be securely tted to a suitable and convenient wall using the
ttings supplied and positioned to enable its connection to the cold inlet set.
When deciding the nal location of the heater consideration should be given to the safe and
visible disposal of any water resulting from leaks or seepage.
This is particularly relevant when the heater is located in a roof space, cupboard or any
concealed location.
For guidance please ring Zip Heaters on 0845 6 005 005 or 0345 6 005 005
Plumbing
1. The unit should be provided with a continuous cold water supply via 22mm pipework.
2. The water connections are at the bottom of the appliance and suitable for either 15mm
compression or 1/2” BSP ttings.
When viewed from the front, the cold feed connection is to the right the hot outlet from
the heater is to the left.
3. The Tee piece and drain valve supplied should be installed on the cold feed to the heater
to enable it to be drained down for servicing or replacement.
4. An isolating valve (not supplied) should be tted in the cold water supply pipework to the
inlet manifold assembly to enable isolation of the water supply to the unit for servicing or
replacement.
5. Fit the inlet manifold assembly to the 22mm supply pipework with the valve caps facing
upwards and in the correct direction of ow as indicated by the arrows.
6. The pressure gauge connection point on the cold inlet set assembly should be accessible
or connection of a pressure gauge if necessary.
Installation
Installation

VP303, VP503, VP803, VP953_Instructions. V1.04 Page 13 November / 2015
7. Provide suitable drainage from the Expansion relief and Temperature & Pressure Relief
Valves via the tundish using 15mm copper tube. Refer to installation requirements.
8. Connect the expansion vessel to the cold inlet set assembly take off (see page 6).
9. A balanced mains pressure cold water supply for a shower may be provided from the
connection provided on the cold inlet set, otherwise this should be blanked.
Note: This connection should not be used to supply cold taps.
10. Flush all pipe work thoroughly before making the nal connections from the cold supply
to the manifold assembly to ensure that any debris is removed. Failure to do this may
result in irreparable damage to the controls and will invalidate the warranty.
11. Connect the hot water supply pipe to the outlet from the heater.
12. Connect the discharge pipe from the tundish. Refer to Installation Requirements.
Electrical
Switch off the mains electrical supply before removing the electrical cover panel or carrying
out any work involving a live circuit or access to components that may be live.
Do not switch on the electrical supply until the unit is full of water.
This appliance must be earthed.
The electrical connection to the heating elements must conform to current IEE wiring
regulations and be permanently connected to the electrical supply through a double-pole
isolating switch with at least 3mm contact separation in each pole and with a minimum rating
of 13A.
All internal wiring is factory mounted and should not be altered or modied.
After removing the electrical cover panel, a suitable supply cable should be fed through the
clamp on the underside of the appliance, connected to the live and neutral connections on the
terminal block and earth terminal on the element plate before securing with the cable clamp.
Check all electrical connections for security and tightness before replacing the cover.
The appliance has a working thermostat adjustable between 37ºC and 75ºC.
An over temperature cut-out is incorporated within the thermostat which is designed to
operate at 79-84ºC. Should this happen, press the reset button.
Important: Before resetting the over temperature cut-out or altering the thermostat
setting, isolate the electrical supply to the unit before removing the electrical cover
panel.Ensurethatthecoverpanelisreplacedcorrectlyandtheretainingscrewstted
before re-connecting the electrical supply.
Electrical Installation Commissioning & Operation

VP303, VP503, VP803, VP953_Instructions. V1.04 Page 14 November / 2015
Commissioning
1. Check that all the requirements under “Installation Requirements” have been met.
2. Check that all water and electrical connections are correct and tight.
3. Check that the expansion vessel pressure is correct – refer to label on vessel for correct
pressure.
4. Check that the drain valve is closed.
5. Open hot water taps.
6. Open the cold water supply valve and permit the heater to ll.
7. Leave hot taps open until all air has been purged from the system and water is owing
freely from all outlets.
8. Check for leaks and rectify as necessary.
9. Check the operation of both the T&P relief valve and the Expansion Relief Valve to ensure
free water ow through the discharge pipe by turning the knob to the left and holding in
the open position.
10. Adjust the temperature control to the desired setting as required.
11. Switch on the electrical supply to the unit. The pilot light will illuminate to indicate that
the elements are operating.
12. During the heating cycle no water should escape to waste from either the expansion relief
or T&P relief valves.
13. Allow the heater to reach the selected temperature when the pilot light will extinguish.
Check the water temperature and re-check water connections adjusting as necessary.
14. Pass these instructions to the person responsible for the building management.
Inspection schedule
It is recommended that all key components of the heater should be inspected on a regular
basis, no greater than twelve monthly intervals, for continued safe and efcient operation. The
inspection should be carried out by a competent person familiar with unvented systems and
the components to be inspected should include the following:
1. Expansion relief valve. Check for correct operation.
2. T&P relief valve. Check for correct operation.
3. Check expansion vessel pressure – refer to label on vessel for correct pressure.
4. Inspect integral line strainer and clean as necessary.
5. Check that the discharge pipework is free of any obstructions.
6. Check that all electrical connections are tight.
Commissioning & Operation

VP303, VP503, VP803, VP953_Instructions. V1.04 Page 15 November / 2015
Maintenance
1. The Zip Varipoint III is an unvented electric water heater and a competent person, familiar
with unvented systems, should carry out all servicing and maintenance.
2. Do not remove the electrical cover panel whilst the unit is connected to the electrical supply.
3. Do not reset the over temperature cut-out until the cause of its operation has been
diagnosed and necessary repairs have been undertaken.
4. Do not use the water heater if it is suspected of being frozen. Switch off the electrical
supply if water ceases to ow and do not switch on again until a competent person has
checked that it is safe to do so.
5. The heater should be visually inspected regularly. This is particularly important if the
heater is located in a cupboard, roof space or any other concealed location. If there is
any sign of leaks or seepage the heater should be isolated from the water supply and
switched off from the electrical supply until a competent person has investigated the
cause.
6. Do not block or restrict the discharge from any safety valve.
7. Do not tamper with any safety valve.
8. If water discharges from any safety valve switch off the electrical supply to the unit,
isolate the water supply and contact a competent person familiar with unvented systems.
9. Please note that lime-scale deposits form more readily at higher temperatures. Damage
or failures caused by the formation of lime-scale are specically excluded under
the terms of the warranty. To reduce lime-scale formation to a minimum the unit should
always be operated at the lowest convenient temperature.
10. If power has been disconnected it is recommended that the unit is drained (see draining).
Maintenance
Fault Finding
Draining
To drain the unit:
1. Isolate the electrical supply.
2. Isolate the mains cold water supply to the unit.
3. Open a hot water tap.
4. Connect a suitable hose to the drain point to allow the contents to be drained safely.
5. Open the drain valve and allow the unit to drain.
De-Installation
To de-install the heater:
1. Switch off and disconnect the electrical supply.
2. Close the mains water supply isolating valve.
3. Drain the heater as described in “Draining”.
4. Disconnect the cold water inlet connection from the manifold assembly.
5. Disconnect the hot water supply pipe from the heater outlet.
6. Remove the heater.

VP303, VP503, VP803, VP953_Instructions. V1.04 Page 16 November / 2015
Fault Finding
Note: All servicing and repairs must be undertaken by a competent person, familiar with
unvented systems.
Fault Possible Cause Solution
Over temperature
cut-out operates.
The thermostat has failed.
The thermostat is set at
too high a temperature.
Reset. If the cut-out operates again
isolate the unit and contact the installer.
Note: Isolate the electrical supply
before removing the electrical cover
panel and ensure that the panel is
correctly replaced and secured before
reconnecting.
Regular, intermittent
water discharge
from tundish.
Loss of pressure from the
expansion vessel.
Isolate the heating system and the
mains cold water supply. Partly drain
the unit. Recharge the expansion
vessel to the specied pressure and
re-commission.
Regular, intermittent
water discharge
from tundish.
Thermostat failure.
Isolate the heating system and check
thermal controls when discharge
ceases. Replace thermostat if faulty.
Continuous water
discharge from the
tundish.
Pressure reducing valve not
operating correctly.
Check with pressure gauge and replace
as necessary.
P&T relief valve not operating
correctly. Check and replace if faulty.
Expansion relief valve not
operating correctly. Check and replace if faulty.
No water ow from
hot taps.
Cold water mains supply
isolated. Restore mains supply to the heater.
Integral line strainer in
pressure reducing valve has
become blocked.
Check and clean as necessary.
Pressure reducing valve
incorrectly tted.
Ret correctly with arrows in direction
of ow.
Water from hot taps
is cold.
Power supply not switched on. Check and switch on.
Over temperature cut-out has
operated.
See fault “Over temperature cut-out
operates” above.
Faulty element. Check and replace as necessary.
Thermostat failure. Check and replace as necessary.
Maintenance
Fault Finding

VP303, VP503, VP803, VP953_Instructions. V1.04 Page 17 November / 2015
The Zip appliance you have chosen is precision-built from the nest materials available and
should give many years of trouble free service.
Certain warranties may be implied by law into your contract with Zip.
The warranty provided below is additional to these implied warranties and nothing set out
below shall limit your statutory rights or rights at law.
Zip Heaters (UK) Ltd warrants that, should the cylinder fail within ve(5) years or any component
fail within two(2) years of installation, that part will be repaired or replaced free of charge by
Zip or its Distributor or Service Provider, except as set out below, provided the appliance is
installed and used strictly in accordance with the instructions supplied, and that failure is not
due to accident, misuse, abuse, unsuitable water conditions, or to any alteration, modication
or repair by any party not expressly nominated by Zip.
No costs are payable by the customer other than any mileage or travelling-time charges
incurred by a Zip Service Provider or the cost of removal, cartage and re-installation of any
component of the appliance if it needs to be returned for repair to Zip or its Distributor.
This warranty does not cover damage resulting from non-operation of the appliance or
consequential damage to any other goods, furnishings or property.
Zip does not exclude, restrict or modify any liability that cannot be excluded, restricted or
modied or which cannot, except to a limited extent, be excluded, restricted or modied as
between the owner or user and Zip under the laws applicable.
Furthermore, this warranty does not displace any statutory warranty, but, to the extent to
which Zip is entitled to do so, the liability of Zip under any statutory warranty will be limited
at Zip’s option to the replacement of the appliance or supply of equivalent appliance, the
payment of the cost of replacing the appliance or acquiring an equivalent appliance, or the
payment of the cost of having the appliance repaired or the repair of the appliance.
Warranty
NOTE: It is our policy to continually improve products and as such we reserve the right to alter
data, specications and component parts without prior notice.
To ensure you have the latest revision of this instruction manual, please visit www.zipheaters.co.uk
to download the latest copy.
IMPORTANT: No liability is accepted for incorrect use of this product.
The use of this crossed out wheeled bin logo indicates that this product needs
to be disposed of separately to any other household waste.
Within each of the European Union member countries, provisions have been
made for the collection and recycling of unwanted electrical and electronic
equipment.
In order to preserve our environment we ask that you dispose of this product
correctly. Please contact Zip Customer Service for advice on 0845 6 005 005 or
0345 6 005 005.
Warranty

VP303, VP503, VP803, VP953_Instructions. V1.04 Page 18 November / 2015
Notes
Warranty

VP303, VP503, VP803, VP953_Instructions. V1.04 Page 19 November / 2015
Notes

VP303, VP503, VP803, VP953_Instructions. V1.04 Page 20 November / 2015
Zip Heaters (UK) Ltd
14 Bertie Ward Way
Dereham
Norfolk
NR19 1TE
Telephone: [phone]
Mobile: [phone]
Fax: [phone]
Web: www.zipheaters.co.uk
The terms ‘Zip’ and ‘Varipoint’ are
registered trademarks
Notes