Main Solar 190 S Ind User manual

36006095_issue_08
Installation Manual
Unvented Solar Indirect Water Heaters Installation & Servicing
Instructions

Pack Contents
●Solar unvented water heater incorporating immersion heater(s) & thermal controls
●Factory fitted temperature/pressure relief valve (set at 90°C / 1 Mpa (10bar))
●Cold water combination valve assembly

●Expansion vessel & mounting bracket
●Tundish
●2 Port motorised valve
●Compression nuts & olives
●Immersion heater spanner
●Installation & servicing instructions
●Guarantee card
IMPORTANT
Please read & understand all these instructions before commencing installation. Please leave this manual
with the customer for future reference.
page 1
Contents
Introduction
General Requirements
Installation General
Installation Discharge
Installation Solar
Installation Auxiliary Heating Coil
Commissioning
Maintenance
User Instructions
Fault Finding & Servicing

Spares
Heat Loss
Environmental Information
Commissioning Check List.
Service Record
Guarantee
Technical Support
Introduction
The cylinder is a purpose designed unvented water heater. The unit has a stainless steel inner vessel,
which ensures an excellent standard of corrosion resistance. The outer casing is a combination of resilient
thermoplastic mouldings and plastic coated corrosion proofed steel sheet. All products are insulated with
CFC free polyurethane foam to give good heat loss performance. (see Table 6)
The unit is supplied complete with all the necessary safety and control devices needed to allow
connection to the cold water mains. All these components are preset and not adjustable.
This appliance complies with the requirements of the CE marking directive and is Kiwa approved to show
compliance with Building Regulations (Section G3).
The following instructions are offered as a guide to installation which must be carried out by a competent
plumbing and electrical installer in accordance with Building Regulation G3, The Building Standards
(Scotland) Regulations 1990, or The Building Regulations (Northern Ireland).
NOTE: Prior to installation the unit should be stored in an upright position in an area free from excessive
damp or humidity.
The Benchmark Scheme

Benchmark places responsibilities on both manufacturers and installers. The purpose is to ensure that
customers are provided with the correct equipment for their needs, that it is installed, commissioned
and serviced in accordance with the manufacturer's instructions by competent persons and that it meets
the requirements of the appropriate Building Regulations. The Benchmark Checklist can be used to
demonstrate compliance with Building Regulations and should be provided to the customer for future
reference.
Installers are required to carry out installation, commissioning and servicing work in accordance with the
Benchmark Code of Practice which is available from the Heating and Hot water Industry Council who
manage and promote the scheme. Visit www.centralheating.co.uk for more information.
IMPORTANT NOTE TO USER: PLEASE REFER TO THE USER INSTRUCTIONS SECTION FOR
IMPORTANT INFORMATION WITH RESPECT TO THE BENCHMARK SCHEME
page 2
General Requirements
IMPORTANT:
IMPORTANT: THIS APPLIANCE CAN BE USED BY CHILDREN AGED FROM 8 YEARS AND
ABOVE AND PERSONS WITH REDUCED PHYSICAL SENSORY OR MENTAL CAPABILITIES
OR LACK OF EXPERIENCE AND KNOWLEDGE IF THEY HAVE BEEN GIVEN SUPERVISORY
OR INSTRUCTION CONCERNING USE OF THE APPLIANCE IN A SAFE WAY AND
UNDERSTAND THE HAZARDS INVOLVED. CHILDREN SHALL NOT PLAY WITH THE
APPLIANCE. CLEANING AND USER MAINTENANCE SHALL NOT BE MADE BY CHILDREN
WITHOUT SUPERVISION
WARNING: Do not switch on if there is a possibility that the water in the heater is frozen.
Siting the Unit
The cylinder must be vertically floor mounted. Although location is not critical, the following points
should be considered:
●The cylinder should be sited to ensure minimum dead leg distances, particularly to the point of
most frequent use.
●Avoid siting where extreme cold temperatures will be experienced. All exposed pipe work should
be insulated.
●The discharge pipework from the safety valves must have minimum fall of 1:200 from the unit
and terminate in a safe and visible position.
●Access to associated controls and immersion heaters must be available for the servicing and
maintenance of the system. Where these controls are installed against a wall a minimum distance
of 250mm must be left (see Fig. 01, below).
●Ensure that the floor area for the cylinder is level and capable of permanently supporting the
weight when full of water. (see Table 01)

Fig. 01: Siting the Unit
Type Model Reference Nominal Capacity
(litres)
Weight of unit full
(Kg)
Weight of unit
(Kg)
190 S Ind 190 243 43
210 S Ind 210 264 50
250 S Ind 250 308 51
Solar
Indirect
300 S Ind 300 367 58
Table 01: Unit weights
Water Supply
Bear in mind that the mains water supply to the property will be supplying both the hot and cold water
requirements simultaneously.
It is recommended that the maximum water demand is assessed and the water supply checked to
ensure this demand can be satisfactorily met.
Note: A high mains water pressure will not always guarantee high flow rates.

Wherever possible the mains supply pipe should be 22mm. We suggest the minimum supply requirements
should be 0.15MPa (1.5 bar) pressure and 20 litres per minute flowrate. However, at these values outlet
flow rates may be poor if several outlets are used simultaneously. The higher the available pressure and
flow rate the better the system performance.
The cylinder has an operating pressure of 0.35MPa (3.5 bar) which is controlled by the cold water
combination valve assembly. The cold water combination valve assembly can be connected to a
maximum mains pressure of 1.6MPa (16 bar).
Outlet/Terminal Fittings (Taps, Etc)
The cylinder can be used with most types of terminal fittings. It is advantageous in many mixer
showers to have balanced hot and cold water supplies. In these instances a balanced pressure cold water
connection should be placed between the expansion vessel connection and the cold water combination
valve assembly (see Fig. 02). Outlets situated higher than the cylinder will give outlet pressures lower
than that at the heater, a 10m height difference will result in a 0.1MPa (1 bar) pressure reduction at the
outlet. All fittings, pipework and connections must have a rated pressure of at least 0.6MPa (6 bar) at
80°C.
page 3
Limitations
The cylinder should not be used in association with any of the following:
●Solid fuel boilers or any other boiler in which the energy input is not under effective thermostatic
control, unless additional and appropriate safety measures are installed.
●Ascending spray type bidets or any other class 1 back syphonage risk requiring that a type A air
gap be employed.
●Steam heating plants unless additional and appropriate safety devices are installed.
●Situations where maintenance is likely to be neglected or safety devices tampered with.
●Water supplies that have either inadequate pressure or where the supply may be intermittent.
●Situations where it is not possible to safely pipe away any discharge from the safety valves.
●In areas where the water consistently contains a high proportion of solids, e.g. suspended matter
that could block the strainer, unless adequate filtration can be ensured.
●In areas where the water supply contains chloride levels that exceed 250mg/l.
Important Note:
THE SOLAR CYLINDER MUST BE INCORPORATED INTO A FULLY PUMPED SOLAR
PRIMARY CIRCUIT.
CONTROL OF THE SOLAR PRIMARY CIRCUIT IS ACHIEVED BY THE USE OF EXTERNAL
CONTROLS NOT SUPPLIED WITH THE UNIT. CONTROL MUST BE A PURPOSE DESIGNED
SOLAR DIFFERENTIAL TEMPERATURE CONTROLLER.
Checklist
●Unvented cylinder
●Cold control pack

- Tundish
- Combination valve
- Expansion vessel
- Tool
- Element spanner
- Compression nuts & olives
- 2 Port motorised valve
●Literature pack
- Installation manual
- Guarantee card
Operational Summary
Maximum mains pressure 1.6MPa (16 bar)
Operating pressure / PRV 0.35MPa (3.5 bar)
Maximum design pressure 0.6MPa (6 bar)
Expansion vessel charge pressure 0.35MPa (3.5 bar)
Expansion relief valve setting 0.6MPa (6 bar)
T&P relief valve setting 90-95°C/1.0MPa (10 bar)
Maximum primary circuit pressure (Auxiliary coil) 0.3MPa (3 bar)
Maximum primary circuit pressure (Solar coil) 0.3MPa (3 bar)
Pressure drop (Auxiliary coil) 0.02MPa (0.2 bar)
Pressure drop (Solar coil) 0.02MPa (0.2 bar)
Storage capacity See Table 1

Weight when full See Table 1
All models in conformance with BS EN 12897:2006
Note: Although the primary coil pressure rating is 1.0Mpa (10 bar) the 2 port zone valve supplied
with the cylinder is only rated 0.86MPa (8.6 bar). If the cylinder is to be plumbed into a system
delivering 1.0MPa (10 bar) a suitable 2 port zone valve will have to be sourced.
page 4
Installation General
Pipe Fittings
All pipe fittings are made via 22mm compression fittings directly to the unit. The fittings are threaded
3/4" BSP male parallel, should threaded pipe connections be required.
Cold Feed
A 22mm cold water supply is recommended, however, if a 15mm (1/2") supply exists, which provides
sufficient flow, this may be used (although more flow noise may be experienced). A stopcock or servicing
valve should be incorporated into the cold water supply to enable the cylinder and its associated controls
to be isolated and serviced.
Cold Water Combination Valve Assembly
The 1-piece cold water combination valve assembly (see Fig. 02) can be located anywhere on the cold
water mains supply prior to the expansion vessel (see Fig. 06). The cold water combination valve is
installed as a complete one-piece unit. The valve incorporates the pressure reducer, strainer, expansion
valve and check valve. Ensure that the valve is installed with the direction of flow arrows pointing in the
correct direction. No other valves should be placed between the cold water combination valve and the
cylinder.
Drain Tap
A suitable drain tap should be installed in the cold water supply to the cylinder between the expansion
valve (see Fig. 06) and the heater at as low a level as possible. It is recommended that the outlet point of
the drain pipework be at least 1 metre below the level of the heater (this can be achieved by attaching a
hose to the drain tap outlet spigot).
Expansion Vessel
The expansion vessel accommodates expansion that results from heating the water inside the unit. The
expansion vessel is pre-charged at 0.35MPa (3.5 bar). The expansion vessel must be connected between
the expansion valve and the cylinder (see Fig. 06). The location of the expansion vessel should allow
access to recharge the pressure as and when necessary, this can be done using a normal car foot pump. It

is recommended that the expansion vessel is adequately supported. An expansion vessel wall mounting
bracket is supplied for this purpose and should be fitted.
Secondary Circulation
If secondary circulation is required it is recommended that it be connected to the cylinder as shown (see
Fig. 03) The secondary return pipe should be in 15mm pipe and incorporate a check valve to prevent
backflow. A suitable WRAS approved bronze circulation pump will be required. On large systems, due
to the increase in system water content, it may be necessary to fit an additional expansion vessel to the
secondary circuit. This should be done if the capacity of the secondary circuit exceeds 10 litres.
Pipe capacity (copper):
15mm O.D. = 0.13 l/m (10 litres = 77m)
22mm O.D. = 0.38 l/m (10 litres = 26m)
28mm O.D. = 0.55 l/m (10 litres = 18m)
Outlet
The hot water outlet is a 22mm compression fitting located at the top of the cylinder. Hot water
distribution pipework should be 22mm pipe with short runs of 15mm pipe to terminal fittings such as
sinks and basins. Pipe sizes may vary due to system design.
Fig. 02: Cold Water Combination Valve Assembly