Bradley Thermostatic Mixing Valve (HL 200) with Optional Cabinet
Installation and Maintenance Instructions
Model S59-3200 Series
7
Bradley Corporation • 215-1299 Rev. H; EN 06-909
1/29/07
Thermostatic Mixing Valve Maintenance
For maximum efficiency, your thermostatic mixing valve requires a minimum amount of maintenance.
Follow the procedures outlined below to achieve highest performance.
Check the piston for smooth movement
To check the valve's piston for free and smooth move-
ment, follow the procedures outlined below:
1. Remove the valve's top cap and pull out the push rod
and then the thermostat (see Figure 5). You may use
a needlenose pliers to remove the thermostat from
the valve body if desired.
2. Insert a 7/16" dia. rod into the valve and into the pis-
ton overheat chamber. Mark the length of the rod
inside the valve (see Figure 6).
3. Push the rod until the piston stops and mark the new
length of the dowel (the new length should be
approximately 9/16" longer than the original length)
(see Figure 6). If the length of the dowel is not as it
should be, the piston is not moving freely and needs
to be cleaned along with the piston liner. Clean the
piston and liner following the method outlined
below:
• remove the control section assembly from the
valve body
• remove the top cap and thermostat
• unthread the liner from the cap (it is glued
together; the O-rings must be removed and a
propane torch may be required to melt the glue
and loosen the liner)
• any cleaner suitable for brass and stainless steel
may be used (if cleaning with suitable cleaner is
not sufficient to remove debris, a 400-grit sand-
paper may be used to polish and hone the piston
and liner).
4. If the piston moves freely, push the mechanism up
and down several times to make sure the piston
moves smoothly and consistently. If movement of
the piston is not consistent, recheck the piston and
liner for dirt and debris as described in procedure #3.
• if the piston parts need to be replaced, contact
your Bradley representative and ask for
Piston/Liner Kit (part number S65-196).
WARNING: To prevent injuries, use proper protective equipment for eyes
and skin when using a propane torch.
THERMOSTAT
Figure 5
TOP CAP
w/PUSHROD
7/16"
ROD
The second mark
should be 9/16"
higher on the rod
than the first mark.
PISTON
OVERHEAT
CHAMBER
Figure 6
