Hubbell Electric Heater Company EMV - Manual (Page 21)

MIXING VALVE
1. Disconnect power from unit.
2. Shut off incoming water supply.
3. Lift test lever on relief valve to relieve pressure in tank.
4. Drain tank.
5. Disconnect unions on both sides of the mixing valve.
6. Remove mixing valve.
7. Replace mixing valve.
8. Fill system in accordance with procedures on page 9.
Acorn Nut Cap
Hot Water Inlet Cold Water Inlet
Union Union
Tepid Water Outlet
RE-CALIBRATE MIXING VALVE
1. Remove small domed acorn nut cap on top of the diaphragm actuator.
2. Without turning the adjustment screw, loosen the locknut securing the adjustment screw.
3. Turn on the water at the shower or eye/face wash and monitor the water temperature during
calibration.
4. Using a 1/8” allen wrench, turn the adjustment screw counter-clockwise to raise the outlet water
temperature or clockwise to lower the outlet water temperature.
5. Start by turning the adjustment screw only one full turn, then observe the water temperature and the
shower or eye/face wash fixture.
6. If needed, turn the adjustment screw an additional ½ turn at a time until the desired water temperature
is reached.
7. Turn off the water at the shower or eye/face wash fixture.
8. Lock the adjustment screw with the locknut.
9. Replace the domed acorn nut cap over the adjustment screw.
10. Re-check the outlet water temperature as described in Section III, Scheduled Maintenance and
Operation, Monthly Inspection – Mixing Valve.
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