Powers e420U User Manual

Hydroguard Series e420 Under-the-Counter thermostatic tem­pering valves are designed for all applications where the temper­ature of generated hot water must be controlled for safe,
economic use. A powerful advanced thermal actuator quickly
senses and compensates for temperature fluctuations induced
by water temperature and pressure changes in the supply line.

Rugged construction features cast brass body and corrosion­resistant internal components for years of dependable, trouble­free service. Stem makes temperature adjustment quick and
easy. Hex in with an allen wrench

For restricted access control, the Series e420 UTC valve can be
housed in a stainless-steel or white baked enamel steel cabinet
and can be packaged with solenoid valve(s) (for ESP electronic
faucets), checkstops or other accessories common to Powers’
cabinet supply offering (required to prevent crossflow).

TECHNICAL INSTRUCTIONS

Hydroguard T/P Series e420

Under-the-Counter Thermostatic Tempering Valve

DESCRIPTION

SPECIFICATIONS

Valve Construction:

Under-the-Counter thermostatic mixing valve, with heavy cast bronze body and brass stem with allen wrench adjustment

Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1/2” NPT Inlets and 1/2” NPT Top Outlet

Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5.25 gpm [19.8 L/min]* (±0.25 gpm [0.94 L/min])

Maximum Hot Water Supply Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .190°F [88°C]

Minimum Hot Water Supply Temperature (not applicable to low temperature hot water valve) . . . .5°F [2.8°C] above set point

Maximum Operating Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .125 psig [862 kPa]

Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90°-110°F Type P/65°–115°F [18°–46°C] Type T

Maximum Static Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .125 psig [862 kPa]

Minimum Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.0 gpm [3.8 L/min]

Shipping Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 lbs. [2.3 kg]

The Hydroguard Series e420 Under-the-Counter valves meet the above operating conditions as stated in ASSE 1016 T/P (45 psi pressure
differential, hot water supply between 140°–180°F [60°–82°C], cold water supply less than 70°F [21°C]).
If your operating conditions vary from those stated in the standard, performance may vary as well. Consult your local sales representative or
a Powers factory engineer to discuss your specific application. All Powers Under-the-Counter thermostatic mixing valves perform to the
requirements of standards ASSE 1016 and CSA B125.

* At 45 psi differential [310 kPa], with hot water supply between 140°–180°F [60–82°C] and 50/50 mix.

Shown above: Model e420-RB-E-S-S-O-O

OPERATION

Hot and cold water enter respective ports in the valve and mix
in a chamber containing an advanced thermal actuator (refer
to cutaway view). This actuator controls the valve assembly.

Rotating the adjustment handle repositions the shuttle in the
cartridge assembly to produce the desired temperature. If the
hot or cold supply water temperature or pressure changes, the
thermal actuator will contract or expand. This movement repo­sitions the shuttle to maintain the desired temperature.

The standard Hydroguard e420 UTC valve is factory set to
deliver tempered water of 110°F [43°C] with equal supply
pressures, with hot water temperature 14O°F [60°C], cold
water temperature 6O°F [15.6°C].

Shutoff Disc

Shuttle

Hot Water Supply

Cold Water Supply

Cartridge

Advanced
Thermal
Actuator

Adjustment
Stem

Form TIE420U

TIE420U Page 2

SAFETY AND PERFORMANCE GUIDELINES

Adherence to these guidelines and recommendations promotes
safe product use and ensures proper valve performance.

1. Thermostatic water mixing valves are control devices which
must be cleaned and maintained on a regular basis. Powers
specifies periodic maintenance at least once a year or immedi­ately after any changes are made to the plumbing system.
Although annual cleaning is recommended, frequency of clean­ing depends on quality of local water conditions. Refer to
Preventive Maintenance below for recommended cleaning pro­cedure.

2. Quick closing valves may cause damage to the mixing valve by
creating shock waves. When the e420 Hydroguard supplies

tempered water to self-closing and/or solenoid valves, Powers
recommends use of a shock absorber (Powers Part No. 460-

353) on the discharge line. This protects the e420 Hydroguard
valve from damage.

3. Locate the valve as close as possible to outlet fixture to avoid
waste of energy and water except in applications where the
valve is used as a primary mixing valve to supply an entire build­ing.

4. Correct valve sizing affects valve and system performance;
under or over-sizing of the mixing valve(s) can cause poor oper­ation and possibly injury.

To be sure you are installing appropriate parts into your valve,
determine the model number. The easiest way to do that is to
look at the date code (found on the bonnet of the valve). The
date code (not to be confused with the product or part num­ber) is a four-digit code. Its purpose is to record the
model/version number of the product itself and the date of
manufacture. (See circle "B" in the figure below for location of
date code.)

In the example below, the Date Code is labeled by circle "B".
The first digit, 8, indicates the model number. The bonnet also
indicates the maximum setting. In the figure below, circle "A"
shows the location of the temperature range: "115" (a stan­dard valve).

Checkstops are required with this valve to prevent cross­flow.

PREVENTIVE MAINTENANCE

TROUBLESHOOTING

MODEL IDENTIFICATION

Every Six Months: Check and adjust the temperature setting

(see instructions below).

Every Twelve Months:

1. Shut off water supply.

2. Open up checkstops (if any).

3. Clean strainers (if any) and check for free movement of
checkstop poppet.

4. Remove the bonnet and check for freedom of movement
of internal components.

5. Replace seals if cracked, cut, or worn.

6. Reassemble.

7. Adjust stem to desired temperature.

1. The flow of water is less than desired…

• valves upstream from supply not fully open

•low supply pressures

• accumulation of lime deposits in hot water pipes, restricting
the flow of hot water

• checkstops not fully open

• clogged strainer screens in the checkstops

• clogged cartridge

2. Flow of water is completely shut off…

• valves upstream from supply completely closed

•failure of cold water supply pressure (the e420 Hydroguard
is designed to shut off on a cold water supply failure)

• checkstops completely closed

3. Flow is untempered hot or cold water…

• accumulation of lime deposits in hot water pipes, restricting
the flow of hot water

• thermostatic actuator failure; replace with new thermostatic
actuator

• hot and cold water supplies are connected to the wrong
ports

4. Maximum temperature specified for the e420 Hydro­guard cannot be obtained…

• accumulation of lime deposits in hot water pipes, -restricting
the flow of hot water

• hot water supply temperature is too low

5. Variable discharge temperature occurs…

• extreme pressure variations in supply lines

• valve operating below minimum capacity requirements

Nameplate Stamp

A

B