Powers HydroGuard e427 Series Owner's manual

The Series e427 and e428 HydroGuard valves automatically
mix hot and cold water to deliver blended water at any desired
temperature within a specified range. The assembly contains
an advanced thermal actuators which maintains the selected
water temperature within rigid tolerances despite temperature
and pressure fluctuations in the water supply.
Construction features include a built-in shutoff valve for delivery
water, a poppet type mixing valve, a concealed adjustment for
raising and lowering the temperature range, and corrosion
resistant parts.
The Series e427/e428 HydroGuard is simply constructed. All
parts are accessible from the front, to facilitate cleaning and
maintenance.
The Series e427/e428 HydroGuard is preferred for a wide variety
of applications because of its accuracy, reliability, and economy
of water and energy. It is chiefly used in showers, baths, hospital
hydrotherapy and residential areas, where precise, consistent
water temperature is required.
Maximum Hot Water Supply Temp. . . . . . . . . . . . . . 190°F (88°C)
Minimum Hot Water Supply Temp. . . . 10°F (6°C) above set point
Maximum Operating Pressure . . . . . . . . . . . . . . 125 psi (861 kPa)
Temperature Range (standard) . . . . . . . . . . . 90-110°F (32–43°C)
(low temperature) . . . . . . . . . . . . . . . . . . . . . 60-100°F (16–38°C)
(high temperature) . . . . . . . . . . . . . . . . . . . 100-160°F (38–71°C)
Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1⁄2″NPT
Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 gpm (0.90 l /s)
Minimum Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 gpm
Maximum Static Pressure . . . . . . . . . . . . . . . . . 125 psi (861 kPa)
Finish . . . . . . . . . Chrome Plated on e428, Rough Bronze on e427
Listing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ASSE 1016
Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . CSA B125 Certified
Shipping Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.0 lbs.
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 on page 2 for recommended cleaning procedure.
2. Locate the valve as close as possible to the fixture being
supplied to avoid waste of energy and water.
Hot and cold water supplies enter the e427/e428 HydroGuard
through their respective inlet ports. Hot and cold water mix in the
chamber containing the cartridge and thermal actuator assemblies.
The resulting mixture flows across the thermostatic motor, and the
motor positions the valve assembly to maintain the desired delivery
water temperature. Delivery water temperature can be varied by
turning the adjustment handle. Turning the handle counterclock-
wise raises the temperature of the delivery water, and turning the
handle clockwise lowers the temperature. Turning the handle com-
pletely clockwise seats the shut off valve and completely stops
the flow. At the same time the hot water disc seats, preventing
crossflow of the water supplies. Valve (without checkstops) does
not prevent crossflow if left in open position and a downstream
shutoff valve is used. If the temperature of the mixture is higher
than the temperature setting, the advanced thermal actuator
expands and forces the valve assembly to move toward the hot
water seat. The reverse occurs when the mixture temperature is
lower than the temperature setting. A change in water temperature
of either hot or cold water supply will cause the advanced thermal
actuator to reposition the valve assembly to maintain the desired
delivery temperature.
EVERY 12 MONTHS:
• Open up the checkstops and check for free movement of
the poppet. To access the checkstops, remove the handle
assembly and trim plate.
• Before servicing the valve, turn off the water supply upstream
OR close the checkstops. To close the checkstops, turn the
adjustment screw fully clockwise on each checkstop.
• Remove the valve bonnet and rinse all grit and impurities from
the cartridges.
• Winterize valves that are used outdoors. Remove and store
the internal components and drain all water from the valve.
EVERY 3 MONTHS:
• Every three months, check the maximum temperature setting.
NOTE: Before servicing checkstops or piping, always turn
off the upstream water supply.
e427
e428
DESCRIPTION SAFETY AND PERFORMANCE GUIDELINES
OPERATION
PREVENTIVE MAINTENANCE
SPECIFICATIONS
TECHNICAL INSTRUCTIONS
HydroGuard®e427/e428
Thermostatic Mixing Valves
Form TI e427 v2

Form TI e427 v2 Page 2
What to look for if:
The maximum temperature cannot be obtained...
a. Lime deposits may have accumulated in the hot water
pipes, restricting the hot water supply.
b. The hot water supply temperature may be too low.
c. The handle rotation setting may be too low. Remove
valve handle, and readjust the high temperature limit
stop.
Flow of water is less than desired…
a. The upstream supply valves may not be fully open.
b. The inlet supply pressure(s) may be low.
c. Lime deposits may have accumulated in cartridge,
restricting water flow.
d. The showerhead may be clogged. Remove and clean.
e. The checkstops may be clogged. Refer to Preventive
Maintenance section.
The valve opens with hot water flow rather than cold
water flow...
a. The inlet water supplies are connected to the wrong
ports or cartridge is installed improperly. The tempered
water is too cold, although cartridge has been
replaced, 0R the hot water temperature is below
115°F...
a. Raise the temperature of the hot water supply.
Flow of water is completely shut off...
a. The upstream supply valves may be completely closed.
b. The hot or cold water supply pressure may have failed.
The e427/e428 valve is designed to close down upon
cold water failure.
c. The checkstops may be closed. Access the checkstops
and open by turning the adjustment screw fully counter-
clockwise.
37⁄ 8
(98)
115⁄16
(49)
13⁄ 4
(44) 3 (76) Min. 33⁄ 4 (95) Max.
Finished
Wall Line
e427
1⁄ 2 NPT
Outlet
63⁄ 4 (171) Max.
37⁄8
(98)
115⁄16
(49)
13⁄4
(44) 37⁄8
(98)
e428
e427
PARTS LIST
CALIFORNIA PROPOSITION 65 WARNING
WARNING: This product contains chemicals
known to the State of California to cause cancer
and birth defects or other reproductive harm.
(California law requires this warning to be given
to customers in the State of California.)
For more information: www.wattsind.com/prop65
© 2003 Powers, a division of Watts Water Technologies, Inc.
USA Phone: [phone] • Fax [phone]
Canada Phone: [phone] • Fax [phone]
www.powerscontrols.com
Form TI e427 v2 0352 EDP# 6512202 Printed in U.S.A.
TROUBLESHOOTING
DIMENSIONS
NO. DESCRIPTION 427-0000 428-0000
11/2″″PLUG*200-046 200-046G
2 BODY N/A N/A
3 KIT, CARTRIDGE ASSEMBLY 427-017 427-017
4 WAX MOTOR KIT 427-250 427-250
LOW TEMP. WAX MOTOR KIT 427-251 427-251
HIGH TEMP. WAX MOTOR KIT 427-252 427-252
5 KIT, BONNET ASSEMBLY 427-019 427-019
6 DUAL PLATE EXPOSED N/A 225-261A
7 TRIM ASSEMBLY 420-335 N/A
8 LOCK RING, POLISHED CHROME 225-394A 225-294A
9 HANDLE 420-242 420-242
* Plug is for bottom port.
4
9
6
5
8
3
1
2
7
Plug is for bottom port.