Watts Industries Powers HydroGuard e420 Series User Manual

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.
TECHNICAL INSTRUCTIONS
HydroGuard T/P
®
Series e420
Thermostatic Valve
Model 1
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.
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: Minimum Flow
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).
Connections: Type 421, 423, 425 (3-port): 1/2” NPT Inlets Type 422, 426 (4-port): 1/2” NPT Inlets
1/2” NPT Top Outlet 1/2” NPT Top Outlet
3/4”NPT Bottom Outlet
Form TI 420 v5
SPECIFICATIONS
DESCRIPTION

Watts Industries Powers HydroGuard e420 Series Specifications

General

Brand	Watts Industries
Model	Powers HydroGuard e420 Series
Category	Control Unit
Language	English

Summary

Product Description

Specifications

Valve Construction Details

Details the materials and design of the thermostatic mixing valve body and stem.

Connection Types and Sizes

Specifies the NPT connection types and sizes for inlets and outlets.

Operation of Thermostatic Valve

Thermal Actuator and Mixing Mechanism

Explains how the thermal actuator controls water mixing via a shuttle in the cartridge assembly.

Handle Rotation Stop Function

Describes the function of the handle rotation stop for controlling temperature limits.

Model Identification Guide

Identifying Model and Temperature Range

Guides users on how to find the model and temperature range from the nameplate stamp.

Installation Instructions

Pre-installation Checks and Preparation

Advises on flushing piping and positioning the valve handle to the OFF position before installation.

Valve Port Configuration and Connections

Differentiates between 3-port and 4-port valve connection types for installation.

Rough-in Guide and Valve Positioning

Details how to use the rough-in guide for correct valve positioning relative to the finished wall.

Correct Piping Connections

Explains correct hot and cold water inlet connections for proper valve operation.

Solder Piping Precautions

Warns about heat damage from soldering and recommends protective measures for valve internals.

Finishing Rough-in and Dial Gasket

Outlines steps for removing the rough-in guide and attaching the dial gasket after wall finishing.

System Testing and Temperature Setting

Guides on testing the system and setting the maximum temperature using the handle rotation stop.

Final Handle and Dial Assembly

Details the final assembly of the dial plate, retaining ring, and handle types.

Shower Installation Diagram (3-Port)

Illustrates shower installation for 3-port models (421, 423, 425) with dimensions.

Tub & Shower Installation Diagram (4-Port)

Illustrates tub and shower installation for 4-port models (422, 426) with dimensions.

ADA-Compliant Handle Configuration

Explains ADA compliance for lever handle and handshower configurations with dimensions.

Preventive Maintenance Schedule

Annual (12-Month) Maintenance Tasks

Outlines annual checks for checkstops, valve bonnet, and outdoor winterization.

Quarterly (3-Month) Temperature Check

Recommends checking the maximum temperature setting every three months.

Safety Guidelines for All Models

General Product Use and Maintenance

Emphasizes regular cleaning, maintenance, and periodic checks of the maximum temperature adjustment.

Protection Against Shock Waves

Advises installing a shock absorber when supplying other valves to prevent damage.

Optimizing Valve Placement

Recommends placing the valve close to the outlet fixture to save energy and water.

Servicing Valve Components

Valve Disassembly Procedure

Provides step-by-step instructions on how to disassemble the thermostatic mixing valve.

Valve Reassembly Procedure

Details the steps for correctly reassembling the valve after servicing, including O-ring installation.

Troubleshooting Common Issues

Maximum Temperature Not Achieved

Lists causes and solutions for not being able to obtain the maximum temperature.

Reduced Water Flow Problems

Identifies reasons for reduced water flow and suggests remedies like cleaning or checking supply.

Incorrect Water Flow Direction

Addresses issues where water flows incorrectly, suggesting checking inlet connections.

Tempered Water Too Cold

Explains why tempered water might be too cold and how to resolve it.

Complete Water Flow Shut-off

Lists potential causes for a complete shut-off of water flow.

Parts List and Identification

Refer to Model Identification for Parts

Instructs users to refer to Model Identification for correct part selection.

E420 Model 1 Parts Breakdown

Lists individual parts, part numbers, kit numbers, and their materials for the E420 Model 1.

Exploded View of e420 Model 1

Valve Component Assembly Diagram

Provides a visual exploded view of the valve components with numbered parts for identification.

Dimensional Data and Checkstops

Checkstop Type Illustrations

Illustrates different types of checkstops (A, B, C, G, D, E, F, H) for reference.

Front View Dimensional Data

Provides front view dimensions for 3-port and 4-port valve installations.

Side View Dimensional Data

Provides side view dimensions for 3-port and 4-port valve installations relative to wall line.