Bradley S19-2000 Series, Installation Manual

Page: 6 / 22

Installation
6 7/18/2012
Troub
leshooting Thermostatic Mixing Valve
Problem Cause Solution
External฀leaks฀in฀the฀
system
Either the NPT joints or the o-rings have been
damaged.
Replace฀the฀NPT฀joints฀and/or฀o-rings฀where฀necessary.฀For฀
replacement฀of฀o-rings,฀contact฀your฀Bradley฀representative฀and฀ask฀
for O-Ring Seal Kit (S65-170).
No฀hot฀water฀low฀(cold฀
water฀low฀only)
The thermostat has failed and, subsequently, the
safety shut-off has engaged. Inspect Thermostat:
1. Remove the top cap and thermostat.
2.฀Insert฀the฀5/16"฀dia.฀push฀rod฀into฀the฀thermostat฀bellows.
3.฀Mark฀the฀length฀the฀push฀rod฀extends฀into฀the฀bellows฀(at฀room฀
temperature,฀with฀10฀lb.฀of฀force.฀the฀length฀should฀be฀approx.฀
15/16" – 1-3/16
"
).
4. If the push rod length is not in the proper range, the thermostat
must be replaced (it cannot be repaired). Contact your Bradley
representative฀and฀ask฀for฀Thermostat฀Kit฀(S65-171).
Limited฀water฀low
The inlet shut-off valve may be partially closed
or฀there฀has฀been฀a฀signiicant฀decrease฀in฀water฀
pressure.
Dirt฀and฀debris฀have฀collected฀on฀the฀check฀
screen or seat, limiting the movement of the stop
and฀checks.
Clean Stop and check Valves:
Remove฀the฀stop฀and฀checks,฀clean฀the฀seat฀and฀reassemble฀the฀
valve. Do not remove the seat. The components may be brushed
with฀a฀small฀wire฀brush฀to฀remove฀debris.฀A฀pair฀of฀tweezers฀works฀
well฀for฀pulling฀debris฀out฀from฀the฀seat.฀If฀the฀stop฀and฀checks฀need฀
to฀be฀replaced,฀contact฀your฀Bradley฀representative฀and฀ask฀for฀
Check/Stop฀Kit฀(S27-102-Rough฀Brass,฀or฀S27-292A-Chrome).
Temperature fluctuation
or improper Temperature
The฀stop฀and฀check฀sections฀of฀the฀valve฀do฀not฀
move freely.
Clean฀Stop฀and฀Check฀Valves฀as฀described฀above.
Thermostat฀is฀slowly฀failing. Check฀Thermostat฀as฀described฀above,฀or฀replace.
Inlet supply line to the mixing valve is being
shared by other pieces of equipment that are
used only periodically, such as laundry appliances
or฀washdown฀stations.฀It฀may฀reduce฀the฀inlet฀
pressure to the mixing valve to less than 3 PSI.
The฀supply฀line฀size฀may฀not฀be฀large฀enough฀to฀
supply both the valve and the other appliances.
Enlarge฀the฀supply฀line฀size,฀reconigure฀the฀supply฀line฀or฀regulate฀
the supply usage.
Recirculation is not balanced.
Review฀recirculation฀set฀up฀on฀page฀5.
Piston does not move freely and must be cleaned. See next page for piston disassembly and cleaning directions.
Before attempting to troubleshoot the valve or
disassemble the components, check for the following:
•฀ Stop/check฀valves฀are฀fully฀open฀(the฀slotted฀stem฀
extends approximately 1/2" from the stem nut) and
that all inlet and outlet shut-off valves are open.
•฀ Hot฀and฀cold฀inlet฀pipes฀are฀connected฀properly,฀
and that there are no cross-connectio ns or leaking
stop/check valves.
•฀ Water฀heater฀output฀is฀at฀least฀20°฀F฀above฀the฀set฀
temperature.
Be sure to close the appropriate shut-off valves prior
to disassembly of the valve and reopen the valves
after inspection and repair is complete.
Top Cap &
Thermostat
Thermostat
Bellows
Push Rod length
should extend
15/16"
–
1-3/16"
into Bellows
5/16" Push
Rod
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