Mira 915 Installation & User Guide

1

IMPORTANT

Installer: This Manual is the property of the customer

and must be retained with the product for

maintenance and operational purposes.

915 SERIES

PRODUCT MANUAL

2

INTRODUCTION

Rada Thermostatic mixing valves are specified to meet the optimum standards of

safety, comfort and economy as demanded by today’s users. All Rada products

are designed, manufactured and supported in accordance with accredited

BS EN ISO 9001:1994 Quality systems.

This manual covers all Rada 915 series shower controls manufactured from

October 1996.

A 1/2" thermostatic mixing valve employing the unique "thermoscopic"

temperature sensor to provide water at safe, accurate temperatures for

ablutionary or process requirements. An adjustable maximum temperature stop is

provided which limits the temperature to the desired level.

Product range

Rada 915: Surface mounted control for connection to exposed

pipework.

Rada 915 Z: Surface mounted control for connection to concealed

pipework.

Rada 915 B: Built-in shower control for connection to concealed pipework.

Rada 915 BAHT: Built-in shower control for connection to concealed pipework.

Rada 915 DV: Surface mounted control with a drain valve for connection to

exposed pipework.

DESCRIPTION

3

Rada products are precision-engineered and should give continued superior and

safe performance, provided:

1. They are installed, commissioned, operated and maintained in accordance with

the recommendations given in this Manual.

2. Periodic attention is given, as necessary, to maintain the product in good functional

order. Recommended guidelines are given in the MAINTENANCE section.

The function of a thermostatic mixing valve is to deliver water consistently at a

safe temperature.

In keeping with every other mechanism, it cannot be considered as being

functionally infallible and as such, cannot totally replace the vigilance of nursing/

supervisory staff where that is necessary.

Provided it is installed, commissioned, operated and maintained within these

recommendations, the risk of failure, if not eliminated, is reduced to the minimum

achievable.

SAFETY : WARNINGS

4

INDEX

page

SPECIFICATION

Important Points 6

Normal Operating Conditions 6

Operating Parameters:

- Pressures/Flow Rates 7

- Temperatures 7

Connections 7

Standard Connections 8

Dimensions 9

PACK CONTENTS

915 Shower Control 13

915 B and 915 BAHT Shower Control 14

915 Z Shower Control 15

915 DV Shower Control 16

INSTALLATION

General 17

Surface Mounted Shower Control (915 and 915 DV) 18

Surface Mounted Shower Control (915 Z) 24

Built-in Shower Control (915 B and 915 BAHT) 26

COMMISSIONING

Maximum Temperature 32

Maximum Temperature Setting 32

915 Drain Valve 33

OPERATION 34

FAULT DIAGNOSIS 35

MAINTENANCE

General 38

Preventative/Precautionary Maintenance 38

(Planned Maintenance Programmes)

Maintenance Procedures 39

- Flow cartridge assembly 39

- Radatherm cartridge assembly 41

- Drain valve 44

5

ACCESSORIES 46

SPARE PARTS

915 Spare Parts List 48

915 Spare Parts Diagram 49

915 DV Spare Parts List 50

915 DV Spare Parts Diagram 51

915 Z Spare Parts List 52

915 Z Spare Parts Diagram 53

915 B and 915 BAHT Spare Parts List 54

915 B and 915 BAHT Spare Parts Diagram 55

915 H Conversion Kit Spare Parts List 56

915 H Conversion Kit Spare Parts Diagram 56

CUSTOMER CARE Back Cover

6

SPECIFICATION

Important Points:

1. The installation, commissioning and maintenance of this product must be

carried out in accordance with instructions given in this Manual, and must

be conducted by designated, qualified and competent personnel.

2. Installations must comply with all Local/National Water Supply Authority

Regulations/Bye-laws, and Building and Plumbing (UK: BS6700) Regulations.

3. Rada products are precision-engineered and should give continued superior and

safe performance, provided:

- they are installed, commissioned, operated and maintained in accordance with

these recommendations

- periodic attention is given as necessary to maintain the product in good functional

order. Recommended guidelines are given in the MAINTENANCE section.

4. WARNING: Continued use of this product in conditions outside the limits listed in

this section can severely affect the performance and reduce the effective service

life, and can present potential risk to users.

5. Suitable for use with most modulating Instantaneous Gas Water Heaters. For

information on Multipoint Electric Water Heaters, refer to Data Sheet P1992. For

information on other specific applications or suitability, refer to Caradon Mira

Limited, or Local Agent.

6. Disinfectants: In applications where system chemical disinfection is practised,

chlorine can be used (calculated chlorine concentration of 50 mg/l [ppm]

maximum in water, per one hour dwell time, at service interval frequency). Such

procedures must be conducted strictly in accordance with the information supplied

with the disinfectant and with all relevant Guidelines/Approved Codes of Practice.

If in any doubt as to the suitability of chemical solutions, refer to Caradon Mira

Limited, or Local Agent.

Normal Operating Conditions are considered as:

- inlet maintained pressures nominally balanced to within 10% of each other

during flow

- a differential of approximately 50°C between the hot and cold inlet

temperatures, and with differentials of 15 to 35°C between the blend setting

and either supply

- daily usage of 1-6 hours

- installation and usage environment not subject to extremes of temperature,

unauthorised tampering or wilful abuse.

7

Operating Parameters: Pressures/Flow Rates

For optimum performance, maintained supply pressures should be nominally equal.

Recommended Maximum Flow Rate: 40 litres/minute.

Recommended Maximum Static Pressure: 8.0 bar.

Recommended Supply Pressure Range: 0.1 - 8.0 bar when used with Rada

fittings.

Recommended Maximum Pressure Loss Ratio 10:1 in favour of either supply.

Operating Parameters: Temperatures

Optimum performance is obtained when temperature differentials of 20°C or more

exist between blend and either supply. Blend control accuracy will begin to diminish

at temperature differentials below 10°C.

Blend Temperature Range: between ambient cold and approximately 60°C,

according to hot water supply temperature.

Optimum Thermostatic Control Range: 30 - 85°C. A high temperature

thermoscopic assembly is available for hot water temperatures up to 100°C

Recommended Minimum Cold Water Temperature: 1°C.

Recommended Maximum Hot Water Supply Temperature: 85°C.

Note: Thermostats fitted as standard can accept temporary temperature excursions

above 85°C without damage, however operation at such elevated supply

temperatures is not recommended. For reasons of general safety, hot water storage

temperatures should ideally be maintained at between 60-65°C where serving

ablutionary applications.

Connections:

Rada 915: Inlets: 15mm compression or 1/2" BSP male.

Outlets: 1/2" BSP male.

Rada 915 Z: Inlets: 1/2" BSP male using offset connectors.

Outlets: 1/2" BSP male.

Rada 915 B and 915 BAHT: Inlets: 1/2" BSP internal.

Outlets: 1/2" BSP internal.

Rada 915 DV: Inlets: 1/2" BSP male.

Outlets: 1/2" BSP male.

8

Standard Connections are:

hot - left (marked red)

cold - right (marked blue)

Note! Should the supplies be reversed then the mixing valve will not be able

to control temperature.

All models can operate in any plane, and may be inverted if necessary for

pipework layout convenience, provided hot and cold pipework is connected to the

appropriate inlets (hot - red, cold - blue).

9

Dimensions:

915

96 mm

61 mm

78 mm

143 mm

129 mm

245 mm

91 mm

36 mm

10

915 B and 915 BAHT

73 to 92 mm

62 mm

46 mm

124 mm

180 mm

80 mm

20 mm

46 mm

73 to 92 mm

80 mm

204 mm

11

915 Z

112 mm

70 mm

115 to 165 mm

245 mm

91 mm

50 mm

62 mm

12

915 DV

96 mm

36 mm

61 mm

129 mm

245 mm

95 mm

185 mm

30 mm

78 mm

13

PACK CONTENTS

2 x Conical Connectors 

2 x Olives 

2 x 1/2" BSP Inlet

Connector Nipples

2 x Gasket

(with larger aperture)

1 x Elbow Plug



2 x Fibre Gaskets

(with smaller aperture)

1 x Elbow Trim 

1 x Outlet Elbow 

2 x Fixing Screws 

2 x Wall Plugs 

1 x 3 mm A/F

Hexagon Wrench

1 x Nameplate



1 x Gasket

(outlet nipple)



1 x Outlet Nipple 



1 x 915 Shower Control 





Tick the appropriate boxes to familiarize yourself with the part names and to

confirm that the parts are included.

915

14

1 x 3 mm A/F

Hexagon Wrench

2 x Fixing Screws



1 x 915 B Shower Control

with Building-in Shroud

2 x Retaining Screws



1 x Concealing Plate 

1 x Seal (foam) 



1 x Concealing

Plate Trim



1 x Concealing

Plate Insert



2 x Wall Plugs 

915 B and 915 BAHT





Tick the appropriate boxes to familiarize yourself with the part names and to

confirm that the parts are included.

15

1 x Elbow Plug 

1 x Nameplate 

1 x Outlet Elbow 

1 x Elbow Trim 

1 x Outlet Nipple 

2 x Offset Connectors 

2 x Pipe Concealing Plates 

1 x 915 Z Shower Control 

1 x Gasket

(outlet nipple)

2 x Fibre Gaskets

(with smaller aperture)



1 x 3 mm A/F

Hexagon Wrench



915 Z





Tick the appropriate boxes to familiarize yourself with the part names and to

confirm that the parts are included.

16

1 x Nameplate 

2 x Fixing Screws 

2 x Wall Plugs 

1 x Outlet Nipple 

1 x Gasket

(outlet nipple)

1 x Outlet Elbow



1 x Elbow Plug 

2 x Fibre Gaskets

(with smaller aperture)

1 x Elbow Trim 

1 x 3 mm A/F

Hexagon Wrench

2 x 1/2" BSP Inlet

Connector Nipples

2 x Conical Connectors



2 x Olives 

2 x Gaskets

(with larger aperture)



1 x Drain Valve 

1 x 915 DV

Shower Control



915 DV





Tick the appropriate boxes to familiarize yourself with the part names and to

confirm that the parts are included.

17

INSTALLATION

General

Installation must be carried out in accordance with these instructions, and

must be conducted by designated, qualified and competent personnel.

1. Before commencing, assure that the installation conditions comply with the

information given in the SPECIFICATION section.

2. Care must be taken during installation to prevent any risk of injury or damage.

3. The mixing valve should be positioned for easy access during use and

maintenance. All routine maintenance procedures can be conducted with the

mixing valve body in place. For built in models, allow a minimum 150 mm frontal

clearance to enable removal of the Radatherm Cartridge assembly and Flow

Cartridge assembly from the mixing valve body during maintenance. With exposed

models allow 130 mm clearance to the side of the temperature control knob and

100 mm clearance to the inside of the flow control knob.

4. Conveniently situated isolating valves must be provided for maintenance.

5. The use of supply line or zone strainers will reduce the need to remove debris at

each mixing valve point. The recommended maximum mesh aperture dimension

for such strainers is 0.5 mm.

6. Pipework must be rigidly supported.

7. Pipework dead-legs must be kept to a minimum.

8. Supply pipework layout should be arranged to minimise the effect of other outlet

usage upon the maintained pressures at the mixing valve inlets.

9. Inlet and outlet threaded joint connections should be made with PTFE tape or

liquid sealant. Do not use oil-based, non-setting jointing compounds.

10. To eliminate pipe debris it is essential that supply pipes are thoroughly

flushed through before connection to the mixing valve.

11. Determine whether the hot or cold water services will be connected to the shower

control from the top (falling) or from the bottom (rising). The hot water service

must always be connected to the hot inlet marked with a red indicator which is

adjacent to the temperature control knob.

12. Before deciding the final positioning of the shower control, please bear in mind

the positioning of the shower control and shower fittings.

18

13. For the 915 DV:

- The drain valve must be mounted vertically with the drain holes pointing

downwards. Clearance must be left under the valve to access the adjusting

screw and to service the valve.

- The maximum distance between the spray head and the drain valve must be

1.5 m.

- The minimum head required between the base of the cold water cistern and

the drain valve must be 1.5 m.

- The valve must be installed over a 'wet' area.

- The valve can only be fitted after a flow closure device and must be fitted to

the lowest point in the system for correct drainage.

Surface Mounted Shower Control (915 and 915 DV)

Rising bottom inlet and falling top inlet supplies

(Refer to Figures 1 and 2)

1. Remove the backplate with the 3 mm A/F hexagon wrench (supplied) by

releasing anti-clockwise the two recessed grub screws which locate against the

spigots.

2. Mark the final fixing position on the wall surface using the backplate as a template.

Mark through the backplate the position of the two smaller diagonal fixing holes.

3. Drill and suitably plug the two marked fixing holes. Secure the backplate to the

wall by using the two fixing screws and wall plugs provided.

4. Locate the shower control onto the backplate and secure by tightening clockwise

the two recessed grub screws.

5. Remove and discard the two plastic inlet concealing caps.

6. Thoroughly flush the incoming hot and cold water supplies before final

connection of the shower control.

7. Assemble the components of the 1/2" BSP straight couplings, (conical

connectors) in the following sequence for each inlet:-

- With the flat face of the 1/2" BSP inlet connector nipple facing the shower

controls inlet, fit the gasket with the larger aperture against the shoulder of

the nipple.

- Ensuring that the compression taper faces outermost, screw in clockwise,

the 1/2" BSP inlet connector nipple using a 12 mm A/F hexagon wrench (not

supplied).

8. Slide the conical connector, then the olive, over the supply pipe. If necessary,

smear liquid jointing on the supply pipe end and the outside of the olive.

19

Installation (915) - Rising Bottom Inlet and Falling Top Inlet

Figure 1

Rising Bottom Inlet Supply

Falling Top Inlet Supply

Supply Pipe

Conical

Connector

Olive

1/2" BSP Inlet

Connector

Nipple

Gasket

Fibre Gasket

Elbow Trim

Outlet Elbow

Fibre Gasket

Elbow Plug

Nameplate

Outlet Nipple

Gasket

Shower Control

3 mm A/F

Hexagon Wrench

Wall Plug

Backplate

Fixing Screw

Grub

Screw

20

Installation (915 DV) - Falling Top Inlet

Figure 2

Falling Top Inlet Supply

Supply Pipe

Conical

Connector

Olive

1/2" BSP Inlet

Connector

Nipple

Outlet Nipple

Gasket

Outlet Elbow

Fibre Gasket

Elbow Plug

Nameplate

Fibre Gasket

Elbow Trim

Drain Valve

Shower Control

Backplate

Fixing Screw

3 mm A/F

Hexagon Wrench

Wall Plug

Grub

Screw

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Mira 915 Installation & User Guide

Mira 915 Installation & User Guide

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