Rada 320 c User manual

IMPORTANT

Installer: This Manual is the property of the customer and

must be retained with the product for

maintenance and operational purposes.

320 c

PRODUCT MANUAL

INDEX

Page

INTRODUCTION 3

DESCRIPTION 3

SAFETY : WARNINGS 3

SPECIFICATION

Important Points 4

Normal Operating Conditions 4

Operating Parameters 4

- Pressures/Flow Rates 4

- Temperatures 5

- Connections 5

- Standard Inlet Configuration 6

- Flow Control 6

DIMENSIONS 6

PACK CONTENTS 7

INSTALLATION

General 8

Outlet position/Reversed inlets 8

Installation 9

COMMISSIONING

Maximum Temperature 11

Maximum Temperature Setting 11

- For Adjustable Temperature 11

- For Locked Temperature 12

Commissioning Checks 13

OPERATION 13

FAULT DIAGNOSIS 14

MAINTENANCE

General 16

Planned Maintenance Programmes 16

(Preventative/Precautionary Maintenance)

Maintenance Procedures 17

- Lubricants 17

- Cartridge Assembly 17

- Check Valve Cartridges 19

- Inlet Filters 21

SPARE PARTS 22

CUSTOMER CARE Back Cover

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.

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

INTRODUCTION

Rada Thermoscopic mixing valves are specified to meet the highest standards of

safety, comfort and economy as demanded by todays users. All Rada products are

designed, manufactured and supported in accordance with accredited BS EN ISO

9001:1994 Quality Systems.

This Manual covers the Rada 320 c valve manufactured from May 1998.

A 3/4" thermostatic mixing valve to suit a wide diversity of applications and installation

formats.

Incorporates the Radatherm cartridge, a unique sealed-for-life unit utilising proven

durability high-technology materials for extended service-free reliability. This cartridge

employs the advanced 2nd generation 'thermoscopic' temperature sensor to provide

water at safe, accurate temperatures for showering or process requirements.

The mixing valve inlets incorporate integral isolating valves, strainers and checkvalves.

For connection to surface pipework, includes angled checkvalve elbows with

integral isolating ball valve. Supplied with compression type connections.

DESCRIPTION

SPECIFICATION

Important Points:

1The 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/Byelaws, 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. Disinfectants: In applications where system chemical disinfection is practised,

chlorine can be used (calculated chlorine concentration of 50mg/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 Kohler Mira Ltd,

or Local Agent.

Normal Operating Conditions are considered as:

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

flow.

- a differential of approximately 50oC between the hot and cold inlet temperatures,

and with differentials of 15-35oC 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.

Operating Parameters

Pressures/Flow Rates

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

Minimum Recommended Flow Rate: 6 l/min at mid-blend with equal dynamic

supply pressures.

Maximum Recommended Flow Rate: 120 l/min.

Maximum Recommended Pressure Loss Ratio*: should not exceed 10:1, in

favour of either supply, during flow.

Maximum Static Pressure: 10 bar.

Maximum Dynamic/Maintained Pressure: 5.6 bar.

Minimum Pressure Loss: 0.1 bar.

Flow Rate/Pressure Loss Graph

Temperatures

Optimum Thermostatic Control Range: 30 - 50oC.

Minimum Cold Water Temperature: 1oC.

Maximum Hot Water Temperature: 85oC.

Connections

320 c -Inlets: 3/4" BSP female thread/22 mm compression (compression

fitting supplied)

-Outlet: 3/4" BSP female thread/22 mm compression (compression

fitting supplied)

Flow Rate

Litres/Min.

Pressure Loss - bar

01.0 3.0 4.0

2.0

100

120

6.0

5.0

*PressureLossRatioisdeterminedbysubtractingtheresistancetoflowoftheoutlet

pipeworkandoutletfittings(generallyknownas"backpressure",andmeasuredatthe

outlet of the mixing valve) from the dynamic pressures of the hot and cold water at

each inlet of the mixing valve. This is at its extreme when the mixing valve is being

usedatitslowestflow-rateandwhenthemaximuminequalityoccursinthepressure

of the hot and cold water supplies.

Standard Inlet Configuration

hot - left (marked red)

cold - right (marked blue)

Flow Control

Rada 320 c mixing valves do not have integral flow control; appropriate provision

must be made for this in the outlet pipework.

This can be in the form of stop-cock, mechanical timed-flow controller or solenoid.

The device chosen must be non-concussive in operation.

DIMENSIONS

180 mm

63.3 mm

222 mm

82.5 mm Dia

187.5 mm

52 mm

82.5 mm Dia

PACK CONTENTS

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

confirm that the parts are included.

Rada 320 c

1 x 320 c 

1 x 3 mm

Hexagonal Wrench

3 x Olives 

3 x Compression Nuts 

1 x Product Manual 

4 x Screws 

3 x Fittings 



4 x Wall Plugs 



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, ensure that the installation conditions comply with the

information given in SPECIFICATION.

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 all models, allow a minimum 100 mm clearance

in front of the temperature control to enable removal of the Radatherm cartridge

during maintenance.

4. 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

5. Pipework must be rigidly supported.

6. Long pipework dead-legs may effect shower performance.

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

usage upon the dynamic pressures at the mixing valve inlets.

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

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

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

flushed through before connection to the mixing valve.

10. Inlet isolators must be used in the fully open position.

11. Do not install the Rada 320 c in a position where it may become frozen.

Outlet Position/Reversed Inlets

All Rada 320 c mixing valves are supplied with the inlet connections configured hot

- left, cold - right, and top outlet as standard.

Should the existing hot and cold pipework make this configuration inconvenient then

remove the cartridge assembly and turn it through 180o(Refer to MAINTENANCE

for cartridge removal and re-assembly).

If a bottom outlet position is required, remove the blanking cap from the bottom of

the valve and replace it with the fitting from the top of the valve. Then fit the blanking

cap to the top of the valve.

Installation

Rada 320 c models have easily adjustable inlet elbows to accommodate rising or

falling supplies.

1. When unpacked, the inlet elbows are positioned to accept falling supplies. Should

the installation require rising supplies then the inlet elbows will need adjusting.

- Loosen each inlet elbow grub screw using the 3 mm hexagonal wrench (supplied).

Note! Each inlet elbow has two grub screws, one for removal of the isolator

assembly and one for removal of the inlet elbow.

- Pull the inlet elbow away from the valve body and refit in the desired position.

- Loosen isolator assembly grub screws and position so that the isolator is

accessible.

- Tighten the grub screws.

2. Loosen the backplate grub screws (3 off) using the 3 mm hexagonal wrench

(supplied) and remove the backplate.

3. Fix the backplate securely to the wall surface using the fixing screws and wall

plugs provided.

4. Important!Flush through the hot and cold supplies thoroughly before connection

to the valve.

5. Fit the valve onto the backplate and tighten the grub screws (3 off).

6. Connect the hot, cold and outlet supplies using the fittings, olives and compression

nuts supplied and check for any leaks.

7. The maximum temperature may now need resetting. Refer to COMMISSIONING.

Backplate

Isolation

Screw

Isolator

Assembly

Compression

Nut

Olive

Wall Plugs

Fixing Screws

Grub Screw

Fitting

Inlet

Pipework

Inlet

Pipework

Outlet

Pipework

Inlet Elbow

Grub Screw

(for removal of

inlet elbow)

Isolator Assembly

Grub Screw

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