Watts Industries Powers HydroGuard e420 Series Technical Instructions

DESCRIPTION
The Series e420 HydroGuard T/P automatically mixes
hot and cold water to deliver blended water within a
specified range. Using an advanced thermal actuator,
the Series e420 quickly compensates for temperature
fluctuations induced by water temperature and pressure
changes. In the event of cold water failure, the thermo-
static motor virtually shuts of the flow of hot water.
Featuring heavy, cast-brass construction, all parts of
the e420 Series valve are accessible from the front of
the valve and are corrosion resistant. The unit also fea-
tures a concealed handle rotation stop to guard against
overadjustment of the handle, and all Series e420
valves open in the cold water position to ensure maxi-
mum bather safety and comfort.
The accuracy, reliability and water economy of the
Series e420 HydroGuard make it preferable for applica-
tions that require precise, consistent water control:
showers, baths, hospital hydrotherapy and residential
areas.
SPECIFICATIONS
Valve Construction: Thermostatic mixing valve, with heavy cast bronze body and brass stem. Concealed handle rotation
stop. Available with acrylic handle, chrome-plated metal tri-handle, or ADA-compliant lever handle.
Connections: Type 421, 423, 425 (3-port): 1/2" NPT Inlets
Capacity............................................................................................................................ 5.0 gpm ± .25 @ 45 psi ∆P 50/50 mix
Maximum Hot Water Supply Temperature........................................................................................................ 190°F (88°C)
Minimum Hot Water Supply Temperature.................................................................................. 5°F (2.8°C) above set point
Maximum Operating Pressure....................................................................................................................... 125 psig (862 kPa)
Temperature Ranges
ASSE 1016 Type T/P.............................................................................................................................. 90 - 110°F (32 - 43°C)
ASSE 1016 Type T.................................................................................................................................. 65 - 115°F (18 - 46°C)
Temperature Limit Stop................................................................................................. Adjustable (factory set at 110°F [43°C])
Maximum Static Pressure.............................................................................................................................. 125 psig (862 kPa)
Minimum Flow and Pressure Differential:
Standard Capacity................................................................................................................................... 1 gpm (3.781 L/min)
Wall Seal Gasket.............................................................................................................................................. Furnished with Dial
Dial Plate..................................................................................................................................... Color-Coded Temperature Scale
Shipping Weight....................................................................................................................................................... 5 lbs. (2.3 kg)
All HydroGuard Series e420 thermostatic mixing valves meet above performance specifications based on typical operating
conditions as stated in ASSE 1016 [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 thermostatic mixing
valves perform to the requirements of standards ASSE 1016 and CSA B125.
Many HydroGuard Series e420 valves and shower sys-
tems can be selected to meet the Americans with
Disabilities Act (ADA) (see page 4 for details).
Type 422, 426 (4-port): 1/2" NPT Inlets
1/2" NPT Top Outlet
TECHNICAL INSTRUCTIONS
HydroGuard T/P
Thermostatic Valve
1/2" NPT Top Outlet
3/4"NPT Bottom Outlet
® Series e420
Model 1
Form TI 420 v5
Minimum Flow