MAINTENA
CLEANING INSPECTION
Remove all dirt and grease accumulation from
Inspect top of packing nut around stem for signs of
side of operator and around packing nut and stem. Use leakage. Repack the valve if necessary. See REPAIR,
solvent if necessary. Packing Replacement
CAUTION
Do not allow solvent to come into contact with
diaphragm, as it can cause serious damage.
Work in well ventilated room to prevent breathing
toxic fumes of solvent.
TROUBLESH
TING
1. Observe room tempera
setting up or down to
perature.
ture and move thermostat
simulate high or low tem-
2. Check air pressure at valve and water flow. Normal
conditions are shown in Table 1.
a.
[fair pressure is opposite normal condition,
check
thermostat operation and calibration. When air
pressure is lower than normal, check for proper
air supply pressure and for air leaks in piping or
diaphragm (see
REPAIR, Diaphragm Replace-
ment). Replace Series
1
models with new oper-
ators or replace both diaphragm and cover.
b. If
air pressure is cowect and water is not flowing
when it should be,
check for pump operation,
air lock, closed hand valves, or stuck valve.
c. If
air pressure is correct and water is flowing when
it should not be,
check for a bad disc or seat,
something lodged under the disc, or water pressure
exceeding valve close-off rating.
Replace stems and discs by disassembling valve (see
REPAIR, Stem and Disc Holder Replacement). Replace
seats on VP5 13B valves by using special tool, Part No.
CCM3833. Replace the entire valve body if the seat on
a VP5 13A valve is defective.
3. Visually inspect the valves for leakage at stem. If
repacking is necessary, see REPAIR, Packing Replace-
ment.
Table
1
-Normal Operating Conditions of VP5 134 & B.
Application Room Temp. Air Pressure Water Flow
Model No. Hot W.
Ch. W. High
High
Low
F l o w
No. Flow
VP5 13A (N.O.)
VP51 3B (NC,)
X X X X
- -
X X X X
X X X X
X X X X
X X X X
X X X X
X X X X
X X X X
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