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Section 3.4: Analyzing Component Failure by Conditions
Section 4.0: Adjustments and Repairs
Section 4.1: V1 Mixing Valve Adjustment Instructions with the Unit Running
CONDITION
COMPONENT FAILURE
If the outlet temperature remains above the
normal range for long periods of time
without fluctuation in the outlet temperature.
Follow Section 3.1 & 3.2 to decommission the
station for repair. Follow Section 4.2 to adjust
the V1 Mixing Valve outside the unit. If the valve
cannot be adjusted correctly a replacement WWM
Diaphragm Actuator is required. If the outlet
temperature is above 95°F, replacement of the V4
Control Valve is required. (See section 4.3 &4.4 for
replacement instructions)
If the outlet temperature fluctuates, rising
above the normal range and then drops
below the normal range.
Follow Section 3.1 & 3.2 to decommission the
station for repair. Follow Section 4.2 to adjust
the V1 Mixing Valve outside the unit. If the valve
cannot be adjusted correctly a replacement WWM
Diaphragm Actuator is required. (See section 4.3 for
replacement instructions)
Cold Water Only
Verify that the hot water flow pressure is adjusted
slightly high than the cold water flow pressure as
per the factory’s installation instructions. Follow
Section 3.1 & 3.2 to decommission the station for
repair. Remove the V4 Control Valve for testing
(See section 4.4). If the V4 tests correctly Follow
Section 4.2 to adjust the V1 Mixing Valve outside
the unit. If the valve cannot be adjusted correctly a
replacement WWM Diaphragm Actuator is required.
If the V1 Mixing Valve is properly adjusted verify
that the hot water supply is not blocked before
replacing the WWM Diaphragm Actuator by slowing
opening the hot water supply valve.
Unit Runs Slightly Off Set-Point
Minor adjustments can be made to the V1. (See
section 4.1)
1.
Remove the cap nut located on the top of the diaphragm head with a 1” wrench.
2.
Loosen calibration lock nut with a 7/16” wrench.
3.
Use a marking pen to make a reference mark so that the calibration screw can be reset to
the original location if needed.
4.
Use a 1/8” hex key to adjust the calibration screw while the unit is running. Turning the
screw counter clock-wise will raise the temperature and turning the screw clock-wise will
lower the temperature. The calibration screw should only be adjusted a ½ turn at a time.
Allow the unit to stabilize for at least one minute after adjustment before trying to make
other adjustments.
5.
Once the necessary adjustments are made tighten the lock nut onto the calibration screw.
6. Re-install the cap nut making sure the face seal does not get pinched. Snug the acorn nut
with a 1” wrench.
Before beginning repairs read and understand Section 3.1. The Station should be tested after all
adjustments are completed.
