Armstrong Rada 320 Instruction Manual

1
Rada 320
Installation and Maintenance
Water Temperature Controls
Groups of Fixtures
Thermostatic
This Rada 320 Valve has been supplied for this application based upon information provided
to Armstrong at the time the order was placed.
This Rada 320 Valve is congured for use in a “dead-leg” piping conguration as indicated in
the drawing on Page 5.
This Rada 320 Valve has not been congured for use in a central pumped re-circulation
system.
This Rada 320 Valve has not been designed to deliver tepid water to Emergency Fixtures.
For further information, please call our technical department Toll Free at 1-888-HOT-HOSE.
Model No. Rada 320 Rada 320D Rada 320DC
Serial No.
Ship Date
1017
ALIB-320-C
B125

2
Water Temperature Control - Groups of Fixtures
Thermostatic
Rada 320
Rada Thermostatic Mixing Valve of “sealed for life” disposable
cartridge construction. Compact design with top and/or bottom
blended water outlet makes Rada 320 ideal for recessed
enclosure, plumbing chase and utility/mechanical room
installation.
Complete operating mechanism of valve is enclosed in a
durable polymer cartridge for ease of field maintenance.
Powerful internal mechanism and non metallic wetted parts
resist mineral deposition.
Capable of close temperature control at diverse flow rates
between 1 gpm (3.8 lpm) 24 gpm (91 lpm). Able to blend within
5°F (2°C) of either inlet supply due to “low seepage” across
internal proportioning mechanism.
Operational Specifications
• Dualthermostaticelementsprovideredundancyinthe
event of individual thermostat failure
• Typicaloutlettemperaturecontrol+/-2°F
• Adjustablemaximumtemperaturelimitstop
• Adjustablesingletemperaturelockout
• Thermalshutdownmodeuponinletsupplyfailure
Technical Specifications
• 1” NPT inlets and 1” NPT outlet
• Chrome-platedDZRbrass/polymerconstruction
• Operating pressures
Maximum: 150 psi (10 bar)
Minimum: 10 psi (.7 bar)
• Integral inlet check valves and strainers
• ASSE 1017 and CSA B125 certified
• Shipping weight 10 lbs (4.5 kg)
Forasubmittaldrawing,refertoCDLW#1061.
Blended
Water
3"
(77 mm)
4x Ø 5/32"
on 1.75 DBC
Cold
Water
Hot
Water
5-7/8"
(149 mm)
2"
(52 mm)
7-3/8"
(187 mm)
Ø 3-1/4"
(83 mm)
Rada Thermostatic Mixing Valves (gpm)
Model Pressure Drop (psi) Min.
Flow CV
5 10 15 20 25 30 35 40 45 50
320 8 11 13 15 17 19 20 22 23 24 1 3.4
425 15 22 27 31 35 38 41 44 46 49 2 6.9
40 36 51 62 72 - - - - - - 2 16.0
50 49 70 85 98 - - - - - - 2 22.0

3
Water Temperature Control - Groups of Fixtures
Thermostatic
Rada 320D
A derivative assembly of the standard Rada 320 Thermostatic
Mixing Valve of “sealed for life” disposable cartridge construction.
Compact design with top and/or bottom blended water outlet
makesRada320Didealforrecessedenclosure,plumbingchase
and utility/mechanical room installation.
Complete operating mechanism of valve is enclosed in durable
polymer cartridge for ease of field maintenance. Powerful
internal mechanism and non metallic wetted parts resist mineral
deposition.
Capable of close temperature control at diverse flow rates
between 1 gpm (3.8 lpm) and 24 gpm (91 lpm). Able to blend
within 5°F (2°C) of either inlet supply due to “low seepage” across
internal proportioning mechanism.
Operational Specifications
• Dualthermostaticelementsprovideredundancyinthe
event of individual thermostat failure
• Typicaloutlettemperaturecontrol+/-2°F
• Adjustablemaximumtemperaturelimitstop
• Adjustablesingletemperaturelockout
• Thermalshutdownmodeuponinletsupplyfailure
Technical Specifications
• 3/4” NPT inlets and 3/4” NPT outlet
• Chrome-platedDZRbrass/polymerconstructionwith
self-finishbrassandbronzecomponents(320D)or
withnickel-platedcomponents(320DC)
• Operating pressures
Maximum: 150 psi (10 bar)
Minimum: 10 psi (.7 bar)
• Integral combination inlet check stop/union/strainers
• Outlet thermometer and outlet flow control valve
• ASSE 1017 and CSA B125 certified
• Shipping weight 10 lbs (4.5 kg)
Forasubmittaldrawing,refertoCDLW#1102. 7-3/8"
(187 mm)
9-1/8"
(232 mm)
11-7/16"
(291 mm)
Rada 320
Rada Thermostatic Mixing Valves (gpm)
Model Pressure Drop (psi) Min.
Flow CV
5 10 15 20 25 30 35 40 45 50
320 8 11 13 15 17 19 20 22 23 24 1 3.4
425 15 22 27 31 35 38 41 44 46 49 2 6.9
40 36 51 62 72 - - - - - - 2 16.0
50 49 70 85 98 - - - - - - 2 22.0

4
Safety Warnings
The function of a Thermostatic Mixing Valve is to deliver water consistently at a pre-designated temperature.
Rada Thermostatic Mixing Valves are precision engineered to give continued superior and safe performance
provided:
1. They are installed, commissioned, operated and maintained in accordance with the recommendations
provided and accepted plumbing practices.
2. Periodic attention is given, as necessary, to maintain the product, the accessory ttings and the
plumbing system in good functional order.
In keeping with every other mechanical product, Rada Mixing Valves should not be considered as functionally
infallible and, as such will never totally replace the vigilance and attention of facility nursing/bathing or other
institutional supervisory or industrial safety staff.
Provided that they are installed, commissioned, operated and maintained, the risk of product failure and its
associated consequences, if not eliminated, are reduced to the minimum achievable.
Rada 320 Operating Specifications
*Rada 320 can accept temporary excursions above 185°F (85°C) and maintain control without sustaining internal
damage. (ASSE 1017 certication requires exposure to 200°F (93°C) for a period of 30 minutes). Prolonged
operation of the Mixing Valve at such elevated temperatures is not recommended.
** Under laboratory test conditions Rada 320 has displayed a repeatable capability to blend to within 5°F (2°C) of
each inlet supply temperature. 21°F (12°C) is the optimum published differential required to achieve full thermal
performance.
Maximum Hot Water Supply Temperature 185°F (85°C) *
Minimum Cold Water Supply Temperature 33°F (1°C)
Optimum Inlet to Outlet Temperature Differential 21°F (12°C) **
Optimum Thermostatic Control Range 86°F (30°C) - 122°F (50°C)
Maximum Flow Rate at 45 psi 23 gpm (87 lpm)
Maximum Flow Rate at 9’ per second 16 gpm (61 lpm)
Minimum Flow Rate 1 gpm (3.8 lpm)
Maximum Inlet Supply Pressure 150 psi (10 bar)
Minimum Inlet Supply Pressure 10 psi (0.7 bar)

5
The Rada 320 Thermostatic Mixing Valve must be installed as per the piping schematic provided on Page 5.
Failure to follow this directive will compromise valve/system performance, void all warranties and may create a
user comfort issue and safety concern.
Armstrong has Rada technical support personnel available from 8:00 a.m. to 5:00 p.m. EST. Call Toll Free
1-888-HOT HOSE.
Notes:
1. Rada 320 may be installed in a vertical or horizontal position.
2. Rada 320 must be installed in a standard HOT-LEFT/COLD-RIGHT inlet supply conguration. There are
red(hot) and blue(cold) markings on each valve. Rada 320 is provided as standard with a piped top outlet
and a plugged bottom outlet. This conguration can be reversed by simply switching the outlet plug and
ttings. The inlet supplies must always match the corresponding inlet ports on the valve. Rada 320D/DC is
provided as standard with a top outlet which can also be reversed.
3. Install at faced union connections* at each inlet and the outlet as close to the mixing valve as feasible to
facilitate check valve and inlet strainer screen service and replacement.
4. Be sure to thoroughly ush the pipework before tting the Rada 320.
5. Be sure to “make up” all “sweat” or “soldered” ttings ahead of time. Do not expose Rada 320 or any of its
ttings to extreme temperatures (such as an acetylene or propane torch).
6. Rada 320 is serviced from the front of the valve as you face it. A minimum 18” clearance in front of the
Temperature Control Handle is suggested for internal parts access.
7. Rada 320 is pre-set at the factory to a xed outlet temperature of 110°F (43°C). It is highly unlikely that the
installation site conditions will match the test conditions. As such:
RADA 320 MUST BE RE-SET ON SITE BY QUALIFIED PERSONNEL.
Rada 320 set up (commissioning the Rada 320 and the system) protocol is included on Page 6.
Rada 320 Installation
Rada 320 Piping Schematic
Rada 215,
320 (shown)
or 425 TMV
Cold Water Supply
Hot Water Supply
Mixed Flow
- Legend -
System Layout
Strainer
Stop Valve
Isolation Valve
Check Valve
Shower
Sink
Thermometer
* Factory supplied on Rada 320D/DC and when Rada 320 is installed in a cabinet assembly (320 FMC/SMC).

6
Commissioning must be carried out in accordance with these instructions, and must be conducted by
designated, qualified and competent personnel.
Ensure that the hot and cold supplies are at their designated pressures and temperatures. Open mixed water
outlet(s) and wait until the hot and cold inlet temperatures are stable. Note the mixed water temperature.
If the mixed water temperature requires adjustment, turn the temperature control handle clockwise to reduce the
temperature or counterclockwise to increase it. Allow a few seconds for the temperature to stabilize.
If the blend temperature required is not obtainable (not hot enough) it is likely that the mixing valve has reached
the factory calibrated maximum temperature set point. To recalibrate set point see Maximum Temperature
below.
Maximum Temperature.
The maximum blend temperature obtainable through the mixing valve should be limited to prevent selection of a
system temperature that is too hot.
Rada 320 is fully performance tested and the maximum temperature is pre-set to approximately 110°F (43°C)
under ideal installation conditions at the factory.
Site conditions and design preference may dictate that the maximum temperature has to be re-set following
installation.
Maximum Temperature Setting
Check that an adequate supply of hot water is available at the hot inlet of the mixing valve.
For optimum performance the minimum temperature of the hot water must be at least 21°F (12°C) above the
desired blend, however during resetting this should be close to the typical storage maximum to reduce the
possibility of any blend shift due to uctuating supply temperatures.
Temperatures should always be recorded using a thermometer with proven accuracy.
For Adjustable Temperature
1. Remove the temperature knob screw using a 3 mm hexagonal wrench (supplied). Remove the temperature
knob.
2. Pull off the black polymer hub assembly which may inadvertently remain attached to the inside of the
temperature control handle. This is a “push t” and can be “levered” out using a thin blade screwdriver or
pliers.
3. Rotate the spindle until required maximum blend temperature is obtained at outlet point (clockwise =
decrease temperature, counterclockwise = increase temperature). When resistance is felt do not use
force to turn any further, as this can damage the internal parts.
4. 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 (refer to Figure 7-1) preventing any
further rotation in a counterclockwise direction. Check that blend temperature has not altered.
5. Ret the temperature knob. Make sure that the indicator points to 9 o’clock.
Commissioning the Rada 320

7
For Locked Temperature
1. Remove the temperature knob using a 3 mm hexagonal wrench (supplied).
2. Pull off the black polymer hub assembly which may inadvertently remain attached to the inside of the
temperature control handle. This is a “push t” and can be “levered” out using a thin blade screwdriver or
pliers.
3. Rotate the spindle until required maximum blend temperature is obtained at outlet point (clockwise =
decrease temperature, counterclockwise = increase temperature).
When resistance is felt do not use force to turn any further, as this can damage the internal parts.
4. Once the desired maximum blend temperature is achieved, re-t the hub without disturbing the spindle,
positioning it so that the center stop slot in the hub ts over the top of the cartridge stop (refer to Figure 7-1),
preventing any further rotation in either direction. Check that the blend temperature has not altered.
5. Ret the temperature knob. Make sure that the indicator points to 6 o’clock.
Rada 320 Servicing and Maintenance (Refer to Figures 8-1 and 8-2)
Rada 320 Thermostatic Mixing Valves should be inspected annually, or more frequently where acknowledged site
conditions such as high mineral content water dictate.
It is highly recommended that as a function of the annual inspection that the two “racetrack” shaped o-seals within
the valve are replaced (D33387) seal pack.
Rada 320 Thermostatic Mixing Valve is of non-serviceable single “cartridge construction”. The cartridge can
be removed from the valve for inspection or replacement by rst removing the chromed brass temperature
control handle using a 3 mm hex wrench. The black polymer hub assembly may inadvertently remain attached
to the inside of the temperature control handle. This is a “push t” and can be “levered” out using a thin blade
screwdriver or pliers.
The chromed polymer Temperature Indicator Ring, which ts beneath the temperature control handle can be
“levered” off using a thin edged tool such as a razor blade knife.
Before proceeding further be sure to isolate the valve by turning off each inlet supply.
The complete cartridge assembly is accessed by rst removing the 6 Phillips head-retaining screws and then
smoothly drawing the cartridge out. Do not twist or apply “side load” leverage when extracting the cartridge.
When installing a new or reinstalling an existing cartridge note the raised “H” on the hot inlet of the cartridge and
align to hot supply accordingly. Conversly, align raised “C” with cold supply.
Commissioning the Rada 320
Figure 7-1

8
The Rada 320 Mixing Unit features a single
“sealed for life” disposable internal cartridge.
With an allen key (3 mm) to remove the handle
retaining screw and a phillips head screwdriver
to remove the 6 cartridge retaining screws,
the entire mixing unit can be serviced and/or
replaced in approximately 10 minutes.
Note: All seals are pre-lubricated. If further
lubrication is required, use only silicone based
lubricants on this product. Do not use petroleum
based lubricants.
Step 1 Step 2
Step 3
Figure 8-2
Body
Cartridge Guides
Temperature Spindle
Temperature Indicating Ring
Temperature Knob
Screw
3 mm Hexagon
Wrench
Hub
Screw
Cartridge Cut-out
To Aid Removal
Cartridge Assembly
‘H’ and ‘C’ marked on
cartridge. Make sure that
the ‘H’ is lined up with the
hot inlet and that the ‘C’ is
lined up with the cold inlet
Figure 8-1
Cartridge Assembly Removal

9
Rada 320/320R/320D
Common Spare Parts
Part No. Description
D33382 Body, Model 320 (less connector)
D33383 Temperature Indicating Ring
D33384 Cartridge Assembly
D33385 Hub Pack
D33386 Inlet/Outlet Adapter, 3/4” Female
D33387 SealPack-Includes“A”Components
D33388 ScrewPack-Includes“B”Components
D33389 BackplateKit-Includes“C”Components
D33390 Knob Pack with Screw
D33391 Blanking Cap
D33392 Outlet Adapter, 1” Male
D33393 Inlet Adapter with Check Valve, 1” Male
3/4” NPT
(Female)
D33386
1” NPT
(Male)
D33392
1” NPT
(Male)
with Integral
Strainer and
Check Valve
D33393

10
Fault Diagnosis
Symptom Cause Action
1. Only hot or cold water
from outlet.
a. Inlet supplies reversed (i.e.: hot to cold or vice-
versa)
Check-Rectify. Tip: check rear of valve under
polymer mounting plate for raised “H” (hot)on
appropriate inlet. If sight evaluation is not possible
consult factory Technical Support for additional
diagnositc tips.
Check-rectify
b. No hot water available from hot water source.
Check-Rectify
c. Screen/lters occluded or inlet supply ttings
plugged.
d. Refer to Symptom 4 below. Refer to Symptom 4 below.
e. Proportioning mechanism (shuttle) trapped against
hot/cold seat.
Refer to Servicing/Maintenance on Pages 7-8. and
Fig. 8-1. Inspect-Rectify-Replace.
2. No ow from Mixing
Valve outlet.
a. Hot or Cold inlet supply failure; Thermostat holding
correct shutdown function. Check-Rectify.
b. Screens/lters blocked or inlet supply ttings
plugged. Check-Rectify.
3. Mixed water temperature
at TMV outlet uctuates
and does not respond to
adjustment.
a. Thermostat not operating correctly. Replace cartridge D33384.
b. Mixing Valve operating below minimum required
ow rate. Check that at least 1 GPM is owing through valve.
c. Static inlet supply pressures beyond valves
capability to correct. Check-Rectify
d. Inlet supply pressures uctuating beyond valves
capability to correct. Check-Rectify
e. Hot water supply temperature uctuating beyond
valves capability to correct.
Check by carefully sensing inlet hot supply pipe
work- rectify.
f. Partially occluded screens/lters or partially blocked
inlet ttings. Check-Rectify.
4. Hot water in cold supply
and vice-versa.
a. Indicates non-functioning check valve (s). Diagnose by turning off mixed water outlet ow and
check to see if inlet hot pipe work becomes cold
and vice-versa.
5. Mixed water temperature
too high.
a. Mixing Valve has not been commissioned correctly
and set too high. Refer to Commissioning on Page 6 - Rectify.
b. Mixing Valve has not been commissioned correctly
and was set when the hot supply temperature was
too low.
Refer to Commissioning on Page 6 - Rectify.
c. Hot water is migrating into cold supply. See Item 4 above.
d. Thermostat not operating correctly. Replace cartridge D33384.
6. Mixed water temperature
too low.
a. Mixing Valve has not been commissioned correctly
and is set too low. Refer to Commissioning on Page 6 - Rectify.
b. Hot water heat is not keeping up with demand. Check-Rectify.
7. Mixed water ow rate is
reduced.
a. Partially occluded inlet screens/lters or partially
blocked inlet ttings. Check-Rectify.
b. Inlet supply pressure has fallen. Check-Rectify.
c. Accumulated pressure losses within the system are
too high.
Refer to a trained and appropriate authority for
system sizing assistance.
8. Water leaking from valve
body. a. Seals worn or damaged. Obtain Seal Pack D33387.