Prochem Legend XL - Manual (Page 35)

MAINTENANCE
86037400 02/16/07
4-10
PACKING NUT ADJUSTMENT FOR
CHEMICAL METERING BYPASS AND
CHEMICAL SELECTOR VALVES
Examine the packing nut on the metering and
selector valves for proper tension every 200 hours.
When turning the knob, there should be a small
amount of resistance. If not, slightly tighten the
packing nut. DO NOT over tighten. Keeping the
valve packings properly adjusted
will eliminate possible leakage from the valve stem
and add to overall valve life.
PRESSURE REGULATOR
The pressure regulator serves to maintain water
pressure at a preset point and to bypass this water
back to the water box.
To adjust:
1. With your unit running, close the cleaning tool.
Check the pressure gauge. Open the tool valve.
We recommend setting the pressure regulator
so that the pressure gauge reads 450 PSI with
the tool valve open.
When the tool valve is opened, there is an
approximate drop of 50 PSI in pressure. If there
is a pressure drop greater than 100 PSI, it
may be necessary to lubricate the o-ring in
the pressure regulator.
2. If the pressure regulator requires adjustment,
loosen the locking nut, then turn the adjusting
body (cap) (while observing the pressure gauge
on the control panel) until the desired pressure
is obtained. Retighten the locking nut.
DO NOT loosen the adjusting body (cap) all the
way (counterclockwise) or remove it while the
unit is running.
We recommend that you lubricate the pressure
regulator o-ring every 50 hours, or whenever
required. If you do not, the stem may become
seized due to inadequate lubrication. If this occurs:
a) Shutdown the unit.
b) Relieve all pressure from the water system.
c) Remove the cap from the pressure regulator and
remove the stem with long nose pliers.
d) Clean and lubricate stem.
e) Reassemble pressure regulator.
CHEMICAL
SELECTOR
VALVE
CHEMICAL
METERING &
HEAT BYPASS
VALVE
PACKING NUT
PACKING NUT (use 5/16"
open end wrench to adjust)
Remove knob
by loosening set
screw to access
packing nut.
PART #86265430
PRV NO. 05-008035