Powers e420UCM User Manual
Under-the-Counter Thermostatic Tempering Valve
Technical Instructions
Description n
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, trouble-free service. Hex socket makes temperature adjustment
quick and easy.
For restricted access control, the Series e420 valve can be
housed in a stainless-steel or white baked enamel steel cabinet and can be packaged with solenoid valve(s), checkstops
or other accessories common to Powers’ cabinet supply
offering.
HydroGuard
IS-P-e420UCM
®
Series e420
Advanced Thermal Activation
Specifications n
Connections ..................................................................................................................................1/2" NPT Inlets and 1/2" NPT Top Outlet
Capacity (without checkstops) ..................................................................................................4.25 gpm (16.0 L/min)*
....................................................................................................................................................(±0.25 gpm [0.95 L/min])
Maximum Hot Water Supply Temperature ..............................................................................190°F (88°C)
Minimum Hot Water Supply Temperature ..............................................................................10°F (6°C) above set point**
Maximum Operating Pressure .................................................................................................... 125 psig (862 kPa)
Temperature Ranges:
Standard ................................................................................................................................... 65-115°F (18-46°C)
Low ............................................................................................................................................ 40-90°F (4-32°C)
High ...........................................................................................................................................120-175°F (49-79°C)
Maximum Static Pressure ...........................................................................................................125 psig (862 kPa)
Minimum Flow: ..............................................................................................................................2.0 gpm (7.6 L/min)
Listing .............................................................................................................................................. ASSE 1070
Shipping Weight ............................................................................................................................ 5 lbs. (2.3 kg)
* At 45psi differential (310 kPa), with hot water supply between 140°–180°F (60–82°C) and 50/50 mix.
**not applicable to low temperature hot water valves
Shuttle
Cold Water Supply
Operation n
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.
Adjustment
Stem
Advanced thermal Actuator
Shutoff Disk
Cartridge
Hot Water Supply
Safety and Performance Guidelines n
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.
Preventive Maintenance n
Every Six Months: Check and adjust the temperature setting
(See No. 4 under "Servicing".)
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. Replace seals if cracked, cut, or worn.
5. Reassemble.
6. Adjust stem to desired temperature.
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.
WARNING:
Always verify the maximum temperature setting to the valve after any changes are made.
This should also be checked as a part of a
facilities maintenance/safety program.
Troubleshooting n
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 Hydro-guard
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
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