Armstrong 425 Manual de instrucciones

Model No. q Model 425

q Model 425D

Serial No. :

Ship Date :

Model 425

Installation and Maintenance

Water Temperature Controls

Groups of Fixtures - Thermostatic

Keep this manual with installation for

future reference.

Armstrong International

221 Armstrong Blvd., Three Rivers, Michigan, 49093 - USA

armstronginternational.com/brain

Introduction.............................................................. 3

Specications .......................................................... 5

General Advisory ..................................................... 5

Safety ...................................................................... 6

Pack Contents ......................................................... 7

Schematic Piping..................................................... 8

Installation ............................................................... 9

General................................................................ 9

Installation Requirements.................................... 9

Tools Required .................................................... 9

Installation Procedure........................................ 10

Commissioning...................................................... 12

Operation............................................................... 13

Servicing & Maintenance....................................... 14

Spare Parts............................................................ 17

Troubleshooting..................................................... 20

Notes ..................................................................... 22

Limited Warranty and Remedy .............................. 24

Contents

Thermostatic Mixing Valves (LPM and BAR)

Model

425

Pressure Drop (BAR) Min.

Flow C

0.30.7 1.01.4 1.72.1 2.42.8 3.13.4

LPM 56.8 83.3 102.2 117.3 132.5 143.8155.2166.6174.1185.57.6 6.9

Thermostatic Mixing Valves (GPM and PSI)

Model

425

Pressure Drop (PSI) Min.

Flow C

5101520253035404550

GPM152227313538414446492.0 6.9

Thermostatic

Model 425

The model 425 Thermostatic Mixing Valve is for institutional

group fixture water temperature control. Compact design with

top and/or bottom blended water outlet makes Model 425 ideal

for recessed enclosure, plumbing chase and utility/mechanical

room installation.

Powerful internal mechanism and stainless steel operating

mechanism resist mineral deposition.

Capable of close temperature control at diverse flow rates

between 2 gpm (7.5 lpm) and 49 gpm (185 lpm). Able to blend

to 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

• 1-1/4” NPT inlets and 1-1/4” outlet

• Chrome plated brass/stainless steel

• Lead Free compliant

• 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 18 lbs (8.1 kg)

For a submittal drawing, refer to D73767.

Designs, materials, weights and performance ratings

are

approximate and subject to change without notice.Visit

armstronginternational.com for up-to-date information.

Armstrong

Hot Water Group, 221 Armstrong Blvd., Three Rivers, MI 49093 – USA

Phone: 269-279-3602, Fax: 269-279-3130

Water Temperature Control - Groups of Fixtures

6.61

(168.0)

3.92

(99.5)

7.63

(193.7)

2.45

(62.2)

7.83

(199.0)

Thermostatic

Model 425D

A derivative of the standard Model 425 Thermostatic Mixing

Valve for institutional group fixture control. Compact design with

top and/or bottom blended water outlet makes Model 425 ideal

for recessed enclosure, plumbing chase and utility/mechanical

room installation.

Factory supplied pre-plumbed and pressure-tested Model

425D is supplied as standard with inlet check valves, strainers,

unions, isolations valves and outlet thermometer and stop

valve*.

*Model 425D is supplied with top outlet and can be site

reconfigured for bottom outlet applications.

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 brass/polymer construction with self finish

brass and bronze lead free components

• Lead Free compliant

• Operating pressures

Maximum: 150 psi (10 bar)

Minimum: 10 psi (.7 bar)

• Inlet check valves, strainers, unions and isolation valves

• Fitted with outlet thermometer and isolation valve

• ASSE 1017 and CSA B125 certified

• Shipping weight 35 lbs (15.9 kg)

For a submittal drawing, refer to D76002.

Thermostatic Mixing Valves (GPM and PSI)

Model

425D

Pressure Drop (PSI) Min.

Flow C

5101520253035404550

GPM152227313538414446492.0 6.9

Designs, materials, weights and performance ratings

are

approximate and subject to change without notice.Visit

armstronginternational.com for up-to-date information.

Armstrong

Hot Water Group, 221 Armstrong Blvd., Three Rivers, MI 49093 – USA

Phone: 269-279-3602, Fax: 269-279-3130

Water Temperature Control - Groups of Fixtures

Thermostatic Mixing Valves (LPM and BAR)

Model

425D

Pressure Drop (BAR) Min.

Flow C

0.30.7 1.01.4 1.72.1 2.42.8 3.13.4

LPM 56.8 83.3 102.2 117.3 132.5 143.8155.2166.6174.1185.57.6 6.9

9.9

(252)

5.0

(126)

TYP

11.0

(279)

TYP

13.6

(345)

Specications

*Model 425 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.

** Normal operating conditions are considered as a differential of approximately 122°F (50°C) between

the hot and cold inlet temperatures, and with differentials of 59°F (15°C) - 95°C (35°C) between the

blend setting and either supply. 59°F (15°C) is the optimum published minimum differential required to

achieve full thermal performance.

Maximum Hot Water Supply Temperature 158°F (70°C) *

Minimum Cold Water Supply Temperature 33°F (1°C) - 77°F (25°C)

Optimum Minimum Inlet to Outlet Temperature Differential 59°F (15°C) **

Optimum Thermostatic Control Range 86°F (30°C) - 122°F (50°C)

Flow Rate at 45 psi 46 gpm (174 lpm)

Minimum Flow Rate 2 gpm (7.5 lpm)

Maximum Inlet Supply Pressure 150 psi (10 bar)

Minimum Inlet Supply Pressure 10 psi (0.7 bar)

General Advisory

This Model 425 Valve has been supplied for this application based upon information provided to Armstrong at the

time the order was placed.

This Model 425 Valve is configured for use in a “dead-leg” piping configuration.

This Model 425 Valve has not been congured for use in a central pumped re-circulation system.

This Model 425 Valve is not designed to deliver tepid water to emergency fixtures.

For further information, please call our technical department 1-269-279-3602 between 08:00 a.m. to

05:00 p.m. EST.

Safety

Applicable codes must be followed and supersede any other instructions.

Generally applicable codes in the US include:

• IPC (International Plumbing Code)

Read this manual

Improper installation or operation may cause a ood resulting in property

damage, personal injury, or death. Armstrong strongly recommends that

a qualied installer be used.

Service must be performed by a qualied person.

Improper installation, start-up, operation, maintenance, or service may

void the warranty.

Hot water or metal may cause scald burns. Skin exposure to 140°F water

or metal for only ve seconds may cause a second degree burn.

Icon Legend

If instructions are not followed:

- injury or death and property damage are imminent

- injury or death and property damage are possible

- potential property damage, expensive repairs, and/or voiding

the warranty may result

The function of a Thermostatic Mixing Valve is to deliver water consistently at a pre-designated temperature.

Model 425 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, Model 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.

Pack Contents

X 1 q

X 3 q

X 1 q

Hot Water Supply

Water Heater

Rada 425

Mixed Flow

Cold Water Supply

System Layout

Thermometer

Sink

Shower

Check Valve

Isolation Valve

Stop Valve

Flow Direction

Pipeline

Schematic Piping

Installation

General

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

qualied and competent personnel.

The installation must comply with all relevant local and state water plumbing codes.

All plumbing components are to be supplied by the installer. Failure to include these components will compromise

the product, system performance and will void the warranty.

Notes:

1. Model 425 is supplied fully performance and pressure tested.

2. Suitable connections for ease of maintenance should be used on the inlet and outlet ports. (Isolation valves

and unions.)

3. The hot and cold water inlet supply pressures must be nominally equal.

4. The inlet supply pipework must be thoroughly ushed before tting the Model 425 valve.

5. The Model 425 can be installed in both rising supplies and falling supplies.

Installation Requirements

The use of supply strainers will reduce debris entering the Model 425. The recommended gauge for such

strainers is 35 mesh (mesh aperture dimension = 0.5mm).

Inlet pressure tappings which allow measurement of the inlet pressures to the Model 425 under operating

conditions are particularly recommended for in-service testing.

Pipework must be rigidly supported to avoid any strain on the connections.

Inlet and outlet threaded joint connections should be made with PTFE thread sealing tape or liquid sealant.

Do not use oil-based, non-setting joint compounds.

Run water for 1 minute from both hot and cold supplies to eliminate pipe debris. It is essential that supply

pipes are thoroughly ushed through before connection to the Model 425.

3.0 mm

Tools Required

Driling Drill Bit Screw Driver Pencil Adjustable Allen Key Safety

Machine size 6 mm Plus & Minus Spanner size 3mm Glasses

Ø 6mm

a. Unscrew the set screw.

b. Remove the Backplate.

a. Use the Backplate to mark the two mounting holes at

the desired height.

b. Drill the holes (6 mm) and t the wall anchors. Screw

the Backplate to the wall.

Caution! Avoid area where underground wirings

or pipelines pass through.

a. Mount the Valve assembly on the Backplate xed on

the wall. Make sure the Valve assembly locks in the

groove.

b. Tighten the set screw.

a. Important! Prior to assembly of the hot and cold

adapters, look inside each one and ensure that there is

a strainer and a white plastic checkvalve. The adapter

with nothing inside is for the outlet.

Thread the coupling nuts onto the Valve assembly

then tighten using an adjustable spanner.

Caution! Use a soft cloth to protect the plating

from damage while tightening the spanner.

Step 1

Step 3

Step 2

Step 4

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