Powers e428 Series Thermostatic Mixing Valves - Manual (Page 2)

The standard e427/e428 Hydroguard is factory set to deliver
tempered water up to a maximum temperature of 110°F
(43°C) with equal supply pressures, hot water temperature
140°F (60°C), cold water temperature 60°F (16°C). If desired,
the maximum temperature setting can be raised or lowered as
follows:
1. Maximum temperature setting adjustment must be set on
the job to in no case greater than 110°F [43°C]. The high
temperature limit stop is located on the bonnet. Rotate
handle to the maximum desired outlet temperature. With an
open-end wrench, screw high temperature limit stop into
bonnet until it touches stem’s shoulder. Close valve and
open it to full hot to verify settings.
1. Remove handle and trim plate.
2. Turn off the hot and cold water supplies.
3. Remove four (4) bonnet screws and bonnet assembly.
4. Remove two motors and adaptor.
5. Assemble two new motors and adaptor and place into
body.
6. Install bonnet assembly.
7. With handle, rotate the stem assembly clockwise, until it
bottoms out on the cartridge. At this point your valve is
in the off position.
8. Turn the hot and cold water supplies back on and verify
there is no leakage.
9. Adjust maximum temperature as described above.
10. Install trim and handle.
Form II e427/e428 v2 Page 2
TROUBLESHOOTING AND REPAIR
Form II e427/e428 v2 0333 EDP# 6512244 Printed in U.S.A.
TEMPERATURE LIMIT STOP
Figure 3
NO. DESCRIPTION 427-0000 428-0000
1 1/2" PLUG 200-046 200-046G
2 BODY N/A N/A
3 KIT, CARTRIDGE ASSY. 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 ASSY. 427-019 427-019
6 DIAL PLATE, EXPOSED N/A 225-261A
7 TRIM ASSEMBLY 420-335 N/A
8 LOCK RING, POLISHED CHROME 225-294A 225-294A
9 HANDLE 420-242 420-242
REPAIR KITS
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 plate, and readjust the
high temperature limit stop (see figure 3).
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.
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 restrict flow upon hot/cold
water failure.
c. The checkstops may be closed. Access the checkstops
and open by turning the adjustment screw fully counter-
clockwise.
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© 2003 Powers, a Watts Industries Co.
USA Phone: 1.800.669.5430 • Fax 1.877.459.3440
Canada Phone: 1.888.208.8927 • Fax 1.888.882.1979
www.powerscontrols.com
MAXIMUM TEMPERATURE SETTING G
MOTOR REPLACEMENT