TI 420 v5 0515 Page 2
To be sure you order and install the appropriate parts into
your valve, first determine the correct model number and
temperature range of your valve.
The temperature range of the valve is stamped on a
nameplate (A). In the example, "115" is shown.
The model number is the first digit of the four-digit date
code stamped on the nameplate (B).
In the example, the date code starts with an 9, so the
model number is 9.
Nameplate Stamp
Before installation of any HydroGuard e420 valve:
● Flush all piping thoroughly.
● Rotate the stem (or handle if attached) of
the valve to its full clockwise position (OFF).
Positioning the Valve:
Note the following differences:
3-Port Valves (421, 423, 425): All ports are 1/2" NPT.
INLETS: Piped to hot and cold water supply.
OUTLET: Piped to the showerhead
(see illustration on page 4).
4-Port Valves (422 & 426):
BOTH INLETS AND TOP OUTLET: 1/2" NPT.
BOTTOM OUTLET: 3/4" NPT, and is piped directly to a
diverter-type tub spout (see illustration on page 4).
1. Mount the rough-in guide, Powers Part #420-202, to
the mixing valve.
A
B
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 tempera-
ture. The mixed water passes over the shut-off disc to
the outlet. If the hot or cold supply water temperature or
pressure changes, the thermal actuator will contract or
expand. This movement repositions the shuttle to main-
tain the desired temperature. With the adjustment handle
in full clockwise (OFF) position, the shut-off disc closes
the mixing chamber from the outlet.
A handle rotation stop limits the movement of the control
handle. The standard HydroGuard e420 valve is factory
set to deliver tempered water up to 110°F [43°C] with
equal supply pressures, with hot water temperature
14O°F [60°C], cold water temperature 6O°F [15.6°C].
Note: The handle rotation stop must be adjusted by
the installer.
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