Table 4-2. Preventive Maintenance Checks and Services for ROWPU System (Continued)
Q - Quarterly
S - Semiannually
A - Annually
CHECK FOR AND HAVE
IS NOT READY/
REPAIRED OR ADJUSTED
B D A D W M Q S A
b. Check cooling and makeup water
flowmeters to assure they are not
clogged with mineral deposits or rust.
Remove and clean when necessary as
1) Turn the black valve knob counter-
clockwise until the threads are disen-
gaged. Then withdraw the stem from
the valve by gently pulling on the
2) Remove the two large mounting
bracket screws which secure the
flowmeter to the system.
3) Unscrew the four recessed screws
located on the back side of the
flowmeter, then gently pull the body
from the rear plate. Keep the body
parallel with the back plate to prevent
undue strain on the body.
4) Remove the slip cap with a push on a
screwdriver, then remove the plug ball
stop using a 1/2 in Allen wrench.
5) Remove the ball float by inverting the
body and allowing the ball to fall into
your hand. (Cover the discharge port
to avoid losing the float thru that
6) Clean the flow tube and flowmeter
body with ordinary soap and water.
Do not use liquid soaps or detergents
which may contain chlorinated sol-
7) Reassemble the unit by reversing the
procedure outlined; then place the
flowmeter in service.
c. Adjust makeup water flowmeter flow rate
for higher flow rate during summer
months and lower flow rate during winter
months. Local climatic conditions deter-
mine final flow rate.