Rada® 50 Thermostatic Mixing Valve Installation and

Rada® 50 Thermostatic Mixing Valve Installation and
ALIB-50-B
Rada® 50 Thermostatic Mixing Valve
Installation and Maintenance
Water Temperature Controls
Recirculation Systems
Thermostatic
This Rada 50 Valve has been supplied for this application based upon information provided to
Armstrong at the time the order was placed.
This Rada 50 Valve is configured for use in a “dead leg” piping configuration as indicated in the
drawing on page 4.
This Rada 50 Valve is not configured for use as the primary controller in a central pumped
re-circulation system.
This Rada 50 Valve is not designed to deliver tepid water to Emergency Fixtures.
For further information, please call our technical department Toll Free at 1-888-HOT-HOSE.
Important Note: Rada 50 is not designed to be the final water
temperature controller in an institutional hygiene application.
Model No. Rada 50
1017
Serial No.
Ship Date
B125
1
Water Temperature Control - Groups of Fixtures
Thermostatic­
Rada 50
Rada 50 Thermostatic Mixing Valve for institutional group fixture
water temperature control when ASSE 1016 certified individual
fixture controls are installed at each point of use
Rada 50 is also applicable for accurate water temperature
control in single open outlet or “dead leg” multiple-point-of-use
industrial process applications. Capable of close outlet water
temperature control at flow rates between 2 and 98 gpm
(7.5 and 371 lpm).
Rada 50 Offers:
• Dual thermostatic elements provide redundancy in the
event of individual thermostat failure
• Typical outlet temperature control +/-2°F
• Adjustable single temperature lockout (removable key)
• Thermal shutdown mode upon inlet supply failure
*Shutdown mode is defined as a thermally driven bias toward
the hot seat within the valve. This action may or may not
reduce the outlet flow rate relative to inlet supply and outlet set
point temperatures. Large capacity Thermostatic Mixing Valves
(1-1/2’’ and 2’’/40 and 50 mm) cannot be guaranteed to fully
shut off in the event of a cold water supply failure.
5-9/16"
(142 mm)
9-3/4"
(248 mm)
(Maintenance Access)
Warning: Rada 50 is not designed to be the final water
temperature controller in an institutional hygiene application.
Technical Specifications
• 2’’ NPT inlets and 2’’ NPT outlet
• DZR brass/stainless steel construction
• Operating pressures
Maximum: 150 psi (10 bar)
Minimum: 10 psi (.7 bar)
• Maximum pressure drop 20 psi (1.3 bar)
• Integral inlet check valves
• Integral thermometer
• ASSE 1017 and CSA B125 certified
• Shipping weight 30 lbs (13.5 kg)
9-13/16"
(249 mm)
Integral Inlet
Check Valve
6"
(152 mm)
2" NPT
(DN50)
2" NPT
(DN50)
Hot
Supply
Cold
Supply
10"
(254 mm)
For a submittal drawing, refer to CDLW #1042.
2" NPT
(DN50)
Mixed
Flow
Rada Thermostatic Mixing Valves (gpm)
Model
Pressure Drop (psi)
25
30
35
40
45
50
Min.
Flow
CV
19
20
22
23
24
1
3.4
35
38
41
44
46
49
2
6.9
-
-
-
-
-
-
2
16.0
-
-
-
-
-
-
2
22.0
5
10
15
20
320
8
11
13
15
17
425
15
22
27
31
40
36
51
62
72
50
49
70
85
98
2
Rada 50 Components
Rada 50 is supplied with the following components:
Description
Part No.
D35313
1 each Rada 50 Thermostatic Mixing Valve with integral inlet
check valves and thermometer.
D35314
D35315
The Rada 50 supplied with this I&M includes the following (checked) Thermostatic Element.
Part No.
Temperature Range
Stamp Code
D14796
Low 90 - 115°F (32 - 46°C)
2195
D14797
Standard 115 - 135°F (46 - 57°C)
8883
D14798
High Above 135°F (57°C)
8887
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 fittings 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 50 Operating Specifications
Maximum Hot Water Supply Temperature
Minimum Cold Water Supply Temperature
Optimum Minimum Inlet to Outlet Temperature Differential
Optimum Thermostatic Control Range
Maximum Flow Rate
Minimum Flow Rate
Maximum Inlet Supply Pressure
Minimum Inlet Supply Pressure
Maximum Inlet to Outlet Pressure Differential (pressure drop)
185°F (85°C) *
33°F (1°C)
18°F (10°C)
86°F (30°C) - 122°F (50°C) **
58 gpm (219 lpm) ***
2 gpm (7.5 lpm)
150 psi (10 bar)
10 psi (0.7 bar)
20 psi (1.4 bar)
Inlet supply pressure must be nominally equal.
*Rada 50 can accept temporary excursions above 185°F (85°C) and maintain control without sustaining internal
damage. (ASSE 1017 certification 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.
**Rada 50 can be supplied with a high temperature thermostat for applications where the outlet temperature
required is greater than 130°F (54°C).
*** Maximum flow rate determined at 9 ft/sec pipeline velocity.
3
Rada 50 Installation
The Rada 50 Thermostatic Mixing Valve must be installed as per the piping schematic provided below. 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 50 may be installed in a vertical or horizontal position.
2. Rada 50 must be installed in a standard HOT-LEFT/COLD-RIGHT inlet supply configuration. There are red
(hot) and blue (cold) markings on each valve. The inlet supplies must always match the corresponding inlet
ports on the valve.
3. Be sure to thoroughly flush the pipework before fitting the Rada 50. A good quality “Y” type strainer (40 mesh
minimum) should be installed on hot and cold water inlets to mixing valve.
4. Be sure to “make up” all “sweat” or “soldered” fittings ahead of time. Do not expose Rada 50 or any of its
fittings to extreme temperatures (such as an acetylene or propane torch).
5. Rada 50 is pre-set at the factory to a fixed outlet temperature. It is highly unlikely that the installation site
conditions will match the test conditions. As such:
RADA 50 MUST BE PRE-SET ON SITE BY QUALIFIED PERSONNEL.
Rada 50 set up (commissioning) protocol is included on page 5.
6. Rada 50 requires service access beneath the bonnet assembly. A minimum access clearance of 18” is
suggested.
Rada 50 Piping Schematic
Hot Water Supply
High Importance:
Install "Y" Strainers on each Inlet Supply
Mixed Flow
50
Cold Water Supply
4
Commissioning the Rada 50
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 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
adjusting key clockwise (Photo 5-1) to reduce the temperature or
counterclockwise to increase the temperature. Turn the key only 1/2
turn at a time and allow a few seconds for the temperature to stabilize.
Photo 5-1
Fixed Temperature Setting
Remove and store the key.
Rada 50 is supplied with a removable temperature adjustment key. The temperature adjustment spindle is
protected by a lock shield mechanism to discourage unauthorized adjustment.
Rada 50 Servicing and Maintenance
Rada 50 Thermostatic Mixing Valves should be inspected annually, or more frequently where acknowledged site
conditions such as high mineral content water dictate.
To service the Rada 50 proceed as follows:
Isolate/by-pass the valve by turning off each inlet supply.
Isolate the outlet.
Step 1.
Turn the adjustment screw, using the Temperature Adjustment key (Part
No. D18462) provided, counter clockwise until it comes to a stop. To make
resetting easier after service, count the number of turns to full stop and
note them in the box provided. Refer to Photo 5-2.
Adjustment screw turns
Photo 5-2
Step 2.
Remove the Bonnet Assembly (Part No. D33741) with a large turning counterclockwise. Refer to Photo 5-3.
wrench by
Photo 5-3
5
Rada 50 Servicing and Maintenance
A. Turn the Adjustment Screw fully clockwise and remove it from the Bonnet Assembly. Refer to Photo 6-1.
Bonnet Assembly
Part No. D33741
B. Remove the Adjustment O-Seals (3) and Cover O-Seal (Service/O-Seal Kit Part No. D33467).
C. Clean and inspect the Cold Valve Face along with all the other machined surfaces using a scouring cloth or a domestic pot cleaner.
D. Reinstall O-Seals into Bonnet Assembly after first applying a silicone-based lubricant such as Dow 111 and re-install adjustment screw.
Bonnet Assembly Servicing:
Refer to Drawing 1 Page 11
Photo 6-1
Step 3.
Fit the Cartridge Removal Tool (Part No. D18463) into the two tappings on
the face of the Cartridge Assembly (Part No. D33431 / D33432 / D33433).
Refer to Photo 6-2.
Photo 6-2
Step 4.
Gently withdraw the Cartridge Assembly, the Return Spring and Spring
Support Washer. Refer to Photo 6-3.
Photo 6-3
Step 5.
Remove Slide Valve Seal (the slide valve seal consists of a white teflon and black EPDM seal) from the Valve
Body; clean seal groove, replace Slide Valve Seal after first applying a silicone based lubricant such as Dow 111.
Refer to Drawing 1 Page 8.
Step 6.
Using two wrenches, grip the hex at each end of the Cartridge Assembly
and carefully unscrew and remove whichever end piece comes loose first.
Refer to Drawing 2 Page 8.
Step 7.
Remove the Thermostatic Element (Part No. D14796 / D14797 / D14798).
Refer to Photo 6-4.
Photo 6-4
6
Rada 50 Servicing and Maintenance
Step 8.
Using a screwdriver placed through the cartridge body to “hold back”
carefully unscrew the remaining end cap on the Cartridge Assembly.
Refer to Photo 7-1.
Step 9.
Clean the Slide Valve using a scouring cloth or a domestic pot cleaner but
do not attempt to remove the slide valve from the spool. Refer to Drawing 2
Page 8.
Photo 7-1
Do not use the scouring cloth on the spool, you will scratch the
specially coated surface. Use a soft cloth and water.
Step 10.
Ensure that the inner surfaces of the Element Guide, Spool and Spool End cap are clean.
Step 11.
Replace Push Rod Seal (Service/O-Seal Kit Part No. D33467) on Push Rod within Element Guide and reassemble. Refer to Drawing 2 Page 8.
Step 12.
Reinstall Element Guide into Cartridge Body being careful to locate the Element Guide at the end of the cartridge, which houses the slide valve. Do not over torque. Refer to Drawing 2 Page 8.
Step 13.
Replace Thermostatic Element after first applying a silicone-based lubricant
such as Dow 111 to the pistons at either end. The Thermostatic Element
comprises two thermostats joined by a spring. Insert the complete assembly
so that the thermostat with the flange (baffle plate) locates first.
Refer to Photo 7-2.
Step 14.
Replace the Spool Endcap using care not to over torque.
Refer to Drawing 2 Page 8.
flange (baffle plate)
Photo 7-2
Step 15.
Replace slide valve seal (slide valve consists of a white Teflon® and black EPDM seal).
Note: Always use new seals (Service/O-Seal Kit Part No. D33467).
Step 16.
Reinstall the Spring Support Washer and Return Spring. Refer to Drawing 1 Page 8.
Step 17.
Reinstall the Cartridge Assembly into the Valve Body.
Step 18.
Replace Bonnet Assembly with the adjustment screw turned fully counter-clockwise.
Step 19.
Refer to your reminder on Page 5, Step 1, and return adjustment screw to its original set point. Pressure test and
re-commission the Valve following the directions on Page 5.
7
Rada 50
Drawing 1
Drawing 2
Adjusting Screw
Adjustment Seals (3)
Valve Cover
Cover Seal
Cartridge Removal Tool
(Part No. D18463)
Cold Valve Face
Cartridge
See Page 12
Spring Support Washer
Return Spring
Hot Inlet
Slide Valve Seal
Cold Inlet
Hot Valve Face
Spool Support Ring
Indicates sealing surfaces which must be clean,
smooth and undamaged.
8
Rada 50 Parts List
Ref.
No.
Part
Name
Assembly
Name
Part
No.
List
Price
Ref.
No.
Part
Name
1
Adjusting Screw
18
Push Rod
2
Lockshield Nut
19
Element Guide
20
Over-Heat Spring
21
Slide-Valve
*3 Adjustment Seal (3)
4
Valve Cover
Bonnet
Assembly
D33741
*5 Cover Seal
6
Return Spring
—
D18462
7
Valve Body
—
D33485
Service/
O-Seal Pack
D33467
*8 Coupling Seal
*9 Slide-Valve Seal
11 Flange Bolt (8)
Screw Pack
D33435
Assembly
Name
Part
No.
List
Price
*22 Push Rod Seal
23 Slide Valve Retainer
*24 Spring Support Washer Cartridge
Assembly
25 Baffle Plate Retainer
Consult
Factory
26
Baffle Plate
27
Spool
28
“Thermostat
Element (2)”
*12 Flange Seal
Service/
O-Seal Pack
D33467
13 Keeper Plate
—
D33486
29
Element Support Spring
Spool End Cap
14 By-Pass Valve (6)
—
D33464
30
15 By-Pass Plate
—
D33487
31
*16 Spool Support Ring
Service/
O-Seal Pack
D33467
17 Outlet Body
—
D33488
Inlet Check Valve
D33469
Consult
Factory
Inlet CV Kit (2) D33472
*Available in Service/O-Seal Pack
D33467
† Also included with Thermostat Assembly Part No. D14796
D14797
D14798
1
18
2
19
Bonnet Assembly
Part No. D33741
20
21
22
3
4
23
24
25
5
26
27
28
29
30
il
ta
e
g
rid
De
rt
Ca
6
7
31
8
Hot Inlet
10
Cold Inlet
9
11
12
13
14
15
16
17
9
Cartridge Assembly
Part No. D33431
D33432
D33433
Rada 50/50R Common Spare Parts
Part No.
Description
System Temp. Range
D18462
Temperature Adjustment Key
—
D18463
Cartridge Removal Tool
—
D33467
Service/O-Seal Kit
—
D14796
Thermostatic Element Low Temp.
90 - 114°F
D14797
Thermostatic Element Standard
115 - 135°F
D14798
Thermostatic Element High Temp.
Above 136°F
D33468
Cartridge Assembly Low Temp.
90 - 125°F
D33469
Cartridge Assembly Standard
113 - 143°F
D33470
Cartridge Assembly High Temp.
above 136°F
D33741
Model 50 Bonnet Assembly
—
D33435
Screw Pack Model 40 and 50 (6) Item 11
—
D33472
Inlet Check Valve Kit (2 each)
—
D8931
Outlet Thermometer
—
10
Fault Diagnosis
Symptom
Cause / Action
a. Temperature setting too high. Temperature has been set when hot supply temperature is too low.
Re-adjust temperature setting. See Servicing and Maintenance beginning on Page 5.
1. Mixed Water Temperature too high
when mixed water is being used.
b. Hot water has migrated into cold water supply. Close all mixed water outlets and check that cold
supply pipework remains cold.
c. Thermostat element has failed. Replace thermostat element. See Servicing and Maintenance
beginning on Page 5.
a. Inlet supplies reversed (i.e. hot supply to cold inlet). Check - Rectify.
b. Not hot water reaching mixing valve. Check.
2. Only hot or cold water from outlet.
c. Check strainers and inlet fittings for blockage.
d. Refer to symptom 6 below.
e. Installation conditions continuously outside operating parameters:
Normal function of mixing valve when operating conditions are unsatisfactory.
a. Check strainers and inlet/outlet fittings for flow restriction.
b. Ensure that minimum flow rate is sufficient for supply conditions.
3. Fluctuating or reduced flow rate
c. Ensure that dynamic inlet pressures are nominally balanced.
d. Ensure that inlet temperature differentials are sufficient.
e. (Subject to rectification of supply conditions) Check thermostatic performance;
renew cartridge assembly if necessary.
Check inlet isolators are fully open.
4. No flow from mixing valve outlet
a. Check strainers and inlet/outlet fittings for blockage.
b. Hot or cold supply failure; thermostat holding correct shutdown function. Rectify.
Indicated operating conditions changed.
5. Blend temperature drift
a. Refer to problem 3 above.
b. Hot supply temperature fluctuation (rectify and refer to Commissioning Page 5).
c. Supply pressure fluctuation. Check - Rectify.
6. Hot water in cold supply or
cold water in hot supply
7. Water leaking from valve body
8. Mixed water temperature varies, and
does not respond to adjustment.
Indicates check valves require maintenance.
Seal(s) worn or damaged.
a. Obtain Service Pack, and replace all seals.
a. The “Cartridge” has seized in the Thermostatic Mixing Valve. Carry out a full service. See Servicing
and Maintenance beginning on Page 5.
b. The “Thermostat Element” has failed. Replace Thermostat Element. See Servicing and Maintenance
beginning on Page 5.
a. Partly blocked strainers. Check - Clean/Replace
9. Mixed water flow rate is reduced.
b. Supply pressure has fallen. Check system at incoming main and other accessible point downstream.
c. Extra demand has been added to the system. Check maximum flow-rate for the “Mixing Valve”
against maximum expected flow-rate. See Page 3.
10. Mixed water temperature suddenly
runs cold.
a. Maximum allowable flow-rate has been exceeded. See Page 3. Fit auxiliary mixing valve in parallel or
reduce the system demand.
11
Limited Warranty and Remedy
Armstrong Hot Water Group, Inc. (“Armstrong”) warrants to the original user of those products supplied by it and
used in the service and in the manner for which they are intended, that such products shall be free from defects in
material and workmanship for a period of one (1) year from the date of installation, but not longer than 15 months
from the date of shipment from the factory [unless a Special Warranty Period applies, as listed below]. This
warranty does not extend to any product that has been subject to misuse, neglect, or alteration after shipment
from the Armstrong factory. Except as may be expressly provided in a written agreement between Armstrong and
the user, which is signed by both parties, Armstrong DOES NOT MAKE ANY OTHER REPRESENTATIONS OR
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY
OF MERCHANTABILITY OR ANY IMPLIED WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE.
The sole and exclusive remedy with respect to the above limited warranty or with respect to any other claim
relating to the products or to defects or any condition or use of the products supplied by Armstrong, however
caused, and whether such claim is based upon warranty, contract, negligence, strict liability, or any other basis
or theory, is limited to Armstrong’s repair or replacement of the part or product, excluding any labor or any other
cost to remove or install said part or product, or, at Armstrong’s option, to repayment of the purchase price. As
a condition of enforcing any rights or remedies relating to Armstrong products, notice of any warranty or other
claim relating to the products must be given in writing to Armstrong: (i) within 30 days of last day of the applicable
warranty period, or (ii) within 30 days of the date of the manifestation of the condition or occurrence giving rise
to the claim, whichever is earlier. IN NO EVENT SHALL ARMSTRONG BE LIABLE FOR SPECIAL, DIRECT,
INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES, INCLUDING, BUT NOT LIMITED TO, LOSS OF
USE OR PROFITS OR INTERRUPTION OF BUSINESS. The Limited Warranty and Remedy terms herein apply
notwithstanding any contrary terms in any purchase order or form submitted or issued by any user, purchaser, or
third party and all such contrary terms shall be deemed rejected by Armstrong.
Special Warranty Periods are as follows:
Flo-Direct Gas Fired Water Heater
The stainless steel structure and stainless steel internals (flame, tube, pall rings, supports, etc.) shall
have a ten (10) year non-prorated guarantee against burn out or any structural failure caused by
materials and workmanship. Provided only clean potable water is heated. The other components on the
Flo-Direct, such as valves, combustion equipment, electrical controls, and the burner shall have a two
(2) year non-prorated guarantee against failure caused by materials and workmanship.
Flo-Rite-Temp Instantaneous Water Heater
The tube bundle shall have a 10-year guarantee against failure caused by materials or workmanship
provided by Armstrong but not against gasket failure or damage caused by corrosion, water hammer or
lack of proper cleaning.
Flo-Rite-Temp Packaged Instantaneous Water Heater
Two (2) years from the date of installation, but not longer than 27 months from the date of shipment.
See above for tube bundle guarantee.
Flo-Eco High Efficiency Gas Water Heater
The heat exchanger and supplied integral components such as the burner, the electrical controls and
valving shall have a two (2) year warranty from the date of installation but no longer than 27 months
from the date of shipment. The tank and replaceable tank liner shall have a 5 year warranty from the
date of shipment.
The Brain – Model DRV80 and derivative assemblies shall have a 5-year all component parts warranty.
Designs, materials, weights and performance ratings are approximate and subject to change without notice.
Visit armstronginternational.com for up-to-date information.
Armstrong International
221 Armstrong Blvd., Three Rivers, Michigan 49093 - USA
Ph: (269) 279-3602 Toll Free: (888) HOT-HOSE (468-4673) Fax: (269) 279-3130
12
ALIB-50-B
Rada 50
Printed in U.S.A. - 5/12
© 2012 Armstrong International, Inc.
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