rada 320 User manual

11300905-W2-A
320

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1. Make sure that the item is installed by a competent installer.
2. Shut off the main water supply.
3. Observe all local plumbing and building codes.
4. Provided that the thermostatic mixing valve is installed, commissioned, operated within
the specication limits and maintained according to this Manual, the risk of malfunction,
if not eliminated, is considerably reduced.
The use of the word ‘failsafe’ to describe the function of a thermostatic mixing valve is both
incorrect and misleading. In keeping with every other mechanism it cannot be considered as
being functionally infallible.
Malfunction of thermostatic mixing valves is almost always progressive in nature and will be
detected by the use of proper temperature checking and maintenance routines.
Certain types of system can result in the thermostatic mixing valve having excessive ‘dead-
legs’ of pipework. Others allow an auxiliary cold water supply to be added to the mixed water
from the mixing valve. Such systems can disguise the onset of thermostatic mixing valve
malfunction.
Ultimately, the user or attendant must exercise due diligence to ensure that the delivery of
warm water is at a stable, safe temperature. This is particularly important in such healthcare
procedures as supervised bathing of patients unable to respond immediately to unsafe
temperatures.
General
Safety
Critical Component Table
Part Number Description
414.51 Cartridge Assembly
1847.232 and 1847.233 Check Valves (where applicable)
The designed service life of all critical components used in this product is 5 years providing
the Rada 320 is operated within the recommended operating conditions and parameters.
However when supply conditions and/or usage patterns do not conform to the recommended
operating parameters and/or conditions the critical components may need to be replaced
more frequently (refer to 'Specication').
Important! In healthcare applications such as hospitals, aged person facilities,
residential care homes, etc. and in any other applications where the user is similarly
at risk, irrespective of supply and usage conditions or the evidence of in-service tests,
the critical components must be replaced at intervals of no more than 5 years.
To ensure continued safe operation of this product, all 'Critical Components' should be
changed every 5 years.
However, when supply conditions or usage patterns do not conform to the recommended
operating parameters the cartridge may need to be replaced more frequently in line with
appropriate risk assessments.

31300905-W2-A
X 1 q
X 1 q
X 1 q
X 1 q
320 IC
X 3 q
X 2 q
X 1 q
X 1 q
X 2 q

4
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320 IF
X 1 q
X 1 q
X 1 q
X 1 q
X 2 q
X 1 q
X 1 q
X 2 q

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320 F
X 1 q
X 1 q
X 1 q
X 3 q
X 1 q

6
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320 M
X 1 q
X 1 q
X 1 q
X 3 q
X 1 q

71300905-W2-A
320 IC
320 IF
RADA 320 C
185 mm
49 mm
49 mm59 mm
127.5 mm
61 mm
41.5 mm
256 mm
314.5 mm
Ø83.5 mm
RADA 320 CX
185 mm
49 mm
49 mm
108 mm
41.5 mm
256 mm
314.5 mm
Ø83.5 mm

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RADA 320 OEM
137 mm
Ø83.5 mm
185 mm
49 mm
49 mm
117 mm
RADA 320 CF 118.5 mm
185 mm
49 mm
49 mm
108 mm
Ø83.5 mm
320 F
320 M

91300905-W2-A
Other Applications
For information on other specic applications or suitability, refer to:
[email protected], or Local Agent.
Disinfection
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:
[email protected], or Local Agent.
inlet dynamic pressures nominally balanced to within 10% of each other during ow.
a differential of 15-35°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.
Normal Operating Conditions are considered as:
Specication
Pressures
Minimum Dynamic Supply Pressure: 0.1 bar
Maximum Dynamic Pressure: 8 bar
Maximum Supply Static Pressure: 10 bar
Maximum pressure loss ratio*: should not exceed 10:1 in favour of either supply during ow.
Maximum pressure loss: inlets to outlet is 5.6 bar, which equates to maximum 120 l/min ow
rate at mid blend.
Note! Pressure loss is the pressure drop between the inlets and the outlet of the mixing valve
when ow is taking place.
* Pressure Loss Ratio is determined by subtracting the resistance of the outlet pipework and
outlet ttings from the dynamic pressures of the hot and cold water at the inlets of the mixing
valve. This is at its extreme when the mixing valve is used at its lowest ow-rate and when
the maximum inequality occurs in the pressure of the hot and cold water supplies.
Operating Parameters

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Temperature
Minimum Cold Water Temperature: 1°C
Maximum Hot Water Temperature: 70°C*
Factory Preset: 43°C under ideal installation conditions
Optimum Thermostatic Control Range: 35°C - 46°C
*Note! For optimum performance reasons it is recommended that the maximum hot water
temperature is limited to 65°C.
Caution! During thermal disinfection the mixing valve can operate up to 85°C for short
periods. Ensure safety precautions are followed during discharge. Chemical disinfection
agents e.g.chlorine/chloramines combined with higher temperatures will affect the life of the
product adversely and could detrimentally affect the thermostatic performance.
Flow Rates
Minimum Flow Rate: 6 l/min at mid blend with nominally equal supply pressures.
Maximum Flow Rate: 120 l/min
Flow Control
Rada 320 mixing valves do not have integral ow control; appropriate provision must be made
for this in the outlet pipework. This can be in the form of a stop-cock, mechanical timed-ow
controller, solenoid or basin/bath tap. The device chosen must be non-concussive in operation.
Connections
320 IC - Inlets & outlet connections: 28mm compression.
320 IF - Inlets & outlet connections: 1” BSP female thread.
320 F - Inlet & outlet adaptors 1” BSP female thread.
320 M - Inlet & outlet adaptors 3/4” BSP male thread.
Flow Rate/Pressure Loss Graph
Flow Rate/Pressure Loss Graph
Flow Rate Litres/Min
Pressure Loss - bar
20
80
01.0 3.0 4.0
2.0
60
40
0
100
120
6.
0
5.0

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1. Installations must comply with all Local/National Water Supply Authority Regulations/
Byelaws and Building and Plumbing Regulations.
2. 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 cartridge assembly during maintenance.
3. Conveniently situated isolating valves must be provided for maintenance (not applicable
for cx version as isolators are supplied).
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. Inlet and outlet pressure tappings should be provided to enable continuing accurate
assessment of operating conditions. This is especially important in healthcare applications.
6. Pipework must be rigidly supported.
7. Pipework dead-legs should be kept to a minimum. The mixed water outlet piping should
not exceed 2 m and the overall length from the hot water circuit to the discharge point
should not exceed 5 m.
8. Supply pipework layout should be arranged to minimise the effect of other outlet usage
upon the dynamic 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 ushed through
before connection to the mixing valve.
11. Inlet isolators must be used in the fully open position.
12. Do not install the Rada 320 valve in a position where it may become frozen.
Outlet Position/Reversed Inlets
All Rada 320 mixing valves are supplied with the inlet connections congured hot - left, cold
- right, and top outlet as standard
.
Should the existing hot and cold pipework make this conguration inconvenient then remove
the cartridge assembly and turn it through 180o(refer to MAINTENANCE for cartridge removal
and re-assembly).
Installation
If a bottom outlet position is required, remove the blanking cap from the bottom of the valve
and replace it with the tting from the top of the valve. Then t the blanking cap to the top of
the valve.
Note! The 320 valve is available in a number of variants to suit your particular application.
Primarily the installation procedure for the 320 IC valve is shown. Most of the procedural
steps are very similar for all variants.

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a
b
6.0 mm
2
1
3.0 mm
6.0 mm
3.0 mm
6.0 mm

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3
320 IC
320 IF
Install the connections

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320 M
320 F
4
1 min

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5
3.0 mm
6
320 IC 320 IF
Install the pipework
a

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320 M
b
c
320 F

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7320 IC shown. The rest of the installation procedure is similar for all variants of the 320 valve.
8

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Commissioning must be carried out in accordance with these instructions, and must be
conducted by designated, qualied and competent personnel.
Maximum Temperature
Exercising the Thermostat
The maximum blend temperature obtainable by the user should be limited, to prevent accidental
selection of a temperature which is too hot.
All Rada Thermostatic mixing valves are fully performance tested individually and the maximum
temperature is pre-set to approximately 43oC under ideal installation conditions at the factory.
Site conditions and personal preference may dictate that the maximum temperature has to
be re-set following installation.
Thermostatic mixing valves with wax thermostats are inclined to lose their responsiveness if
not used. Valves which have been in storage, installed but not commissioned, or simply not
used for some time should be exercised before setting the maximum temperature or carrying
out any tests.
A simple way to provide this exercise is:
Maximum Temperature Setting
Check that an adequate supply of hot water is available at the hot inlet of the mixing valve.
The minimum temperature of the hot water must be at least 15 oC above the desired blend,
however, during resetting this should be close to the typical storage maximum to offset the
possibility of any blend shift due to uctuating supply temperatures.
Check that both inlet isolating valves are fully open (If installed).
Temperatures should always be recorded using a thermometer with proven accuracy.
Commissioning
1. Ensure that the hot and cold water are available at the valve inlets, and the outlet is
open.
2. Move the temperature control rapidly from cold to hot and hot back to cold several times,
pausing at each extreme.

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2. Rotate the spindle until required blend temperature is obtained at outlet point (clockwise
= decrease temperature, anticlockwise = increase temperature).
3. Once the desired maximum blend temperature is achieved, re-t the hub without
disturbing the spindle: Position the hub so that the hub stop comes up against the
cartridge stop preventing any further rotation in an anti-clockwise direction. Check that
blend temperature has not altered.
4. Ret the temperature knob. Make sure that the indicator points to 9 o'clock.
For Adjustable Temperature
1. Remove the concealing cap, temperature knob and then the screw using the 3 mm
hexagonal wrench (supplied). Remove the temperature knob and the hub.

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For Locked Temperature
1. Remove the concealing cap, temperature knob and then the screw using the 3 mm
hexagonal wrench (supplied). Remove the temperature knob and the hub.
3. Once the desired maximum blend temperature is achieved, re-t the hub without disturbing
the spindle, positioning it so that the centre stop slot in the hub ts over the top of the
cartridge stop, preventing any further rotation in either direction. Check that the blend
temperature has not altered.
4. Ret the temperature knob. Make sure that the indicator points to 6 o'clock.
2. Rotate the spindle until required blend temperature is obtained at outlet point (clockwise
= decrease temperature, anticlockwise = increase temperature).