Powers MM430 2 Valve HiLo - Manual (Page 3)

See enclosed IS-P-LFLM490-LFLM490-10 and IS-P-LFMM430.
Adjusting to Individual High Flow and Low Flow Valves
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3
What to look for if:
• Outlet temperature is too hot with low flow:
1. The maximum temperature of the low flow valve was not prop-
erly set. Refer to set up procedure and reset the maximum
temperature of the low flow valve.
2. The thermal actuator of the low flow valve is not working prop-
erly. Replace accordingly to the appropriate technical instruc-
tions (IS-P-LFLM490-LFLM490-10 and IS-P-LFMM430).
• Outlet temperature is too hot with a high flow:
1. The maximum temperature of a high flow valve was not prop-
erly set. Refer to Set Up Procedure and reset the maximum
temperature of the high flow valve.
2. The thermal actuator of the high flow valve is not working prop-
erly. Replace accordingly, IS-P-LFMM430 enclosed.
• Outlet temperature too low on low and high flow:
1. The hot water temperature is too low. You must have a supply
temperature of at least 5°F (3°C) higher than the set tempera-
ture. Re-adjust the hot water supply.
2. The checkstops on the hot side of the valve are not fully open,
or may be stuck due to liming. Open and clean checkstops.
Troubleshooting
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Thermostatic water mixing valves are control devices which must
be cleaned and maintained on a regular basis.
1. Before servicing checkstops or piping, turn off the water
upstream. At least every twelve (12) months, open up the check-
stops and check for the free movement of the poppet.
2. Before servicing the valve, turn off the water supply upstream
or close the checkstops. To close the checkstops, turn the
adjusting screw clockwise.
3. When opening checkstops after servicing, turn adjusting screw
counterclockwise to fully open position then turn adjusting
screw 1/2 turn clockwise for final setting.
4. Every three (3) months, check the maximum temperature adjust-
ments.
5. Every twelve (12) months, remove the valve bonnets and check
the internal components for freedom of movement.
Preventative Maintenance
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See enclosed IS-P-LFLM490_LFLM490-10 and IS-P-LFMM430.
Parts Kits
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WARNING !
Any changes in supply condition could effect the out-
let water temperature. Check and adjust the valves
accordingly to prevent injury to the users. After com-
pleting repairs, check discharge temperature, (105°F
[41°C]). Reset if necessary. Failure to perform this
operation could result in unsafe discharge tempera-
ture, which may cause injury or death.
3. The temperature has not been set properly on the small and/or
large valve. Refer to Set Up Procedure and reset the valves.
• Outlet flow drops off:
1. The differential across the PRV is set too high, so the high flow
valve begins controlling the system too late, and starves the
system. Refer to the Set Up Procedure and decrease the differ-
ential across PRV.
2. The checkstops on the high flow valves are not fully open or are
stuck due to liming. Open and clean checkstops.
3. The system pressure varies by more than 50% of the inlet sup-
ply pressure.
• Outlet temperature cycles between hot and cold:
1. The differential across the PRV is set too low, so the high flow
valve begins controlling the system too early and therefore,
cycles (hunt for the set point). Refer to the Set Up Procedure
and increase the differential across PRV.
2. The system pressure varies by more than 50% of the inlet sup-
ply pressure.