Honeywell VP522A User manual

Honeywell
VP522A, B
Sequencing Water Valve
x173
GENERAL
Description
VP522 Sequencing Water Valves are pneumatically actuated,
three-pipe water valves that control both hot and cold water
flow to fan coil units in three- and four-pipe systems.
CONTROL
AIR
*{y
I
VP522A
VALVE
Application
The VP522A controls the flow of hot or cold water to a fan coil
unit from the hot or chilled water supply piping.
The VP5226 is used in conjunction with the
VP522A as a
diverting, return-water valve on four-pipe systems to ensure
isolation of the hot and chilled water circuits.
Operation
The VP522A (Fig. 1) is a proportioning valve that controls the
flow of first hot and then cold water to a fan coil unit as
branchline pressure increases and the reverse as branchline
pressure decreases. No flow occurs at mid-pressure. See
Table 1for operating sequence.
The
VP522B diverts the return water from the coil directly to
return piping of the system feeding the coil. During the dwell
period of the
VP522A, when both ports are closed but the
valve is moving towards opening either the hot or cold port,
the
VP522B is actuated to open the proper port before the
VP522A allows water to flow.
+ CONTROL
tl_
AIR
VP5220B
VALVE
CH I LLEO
+
WATER TO
-+ CHILLER
HOT +
WATER
-+ To
w-
COIL BOILER
Fig. 1. VP522A, B Typical Application.
Copyright 0 1992 Honeywell Inc. l All Rights Reserved
llllllllll Ill lllllll II I
75-2598

VP522A, B SEQUENCING WATER VALVE
Table 1. VP522A, B Operating Sequence on Control Air Pressure increase.
UP522A
3/8 in I 1/2 & 3/4 in.
Hot port closes
I
psi (kPa)
0 (0)
1 (7)
2 (14)
3 (21)
4 (28)
5 (34)
13 (90)
Cold port open 100% Cold port open 100% 14 (97)
15 (103)
Hot port open 100%
Hot port closes
Both ports closed
Cold port opens
Cold port open 100%
Specifications
See Table 2 for VP522 model number, size, capacity index,
and close-off rating.
Table 2. VP522 Specifications.
* Not available for replacement. Use valve with different nominal pipe size and
same capacity index.
T Not available for replacement. Use valve with different capacity index.
5 Rating will maintain closure against 15 psi (103 kPa) difference in return line
pressure when used with VP522A. Combination is subject to maximum
differential pressure limits of VP522A.
75-2598

VP522A, B SEQUENCING WATER VALVE
Nominal Body Rating:
250 psi (1724 kPa)
Water Temperature Limits:
35F (2C) min to 250F (121 C) max
Packing:
Rubber V-ring, spring loaded, self adjusting
Seats:
Brass, upper seat removable, lower seat integral
Plugs:
Brass
Disc:
Molded-in composition
Operator Diaphragm:
Molded neoprene, rolling type
Operator Maximum Safe Air Pressure:
25 psi (172 kPa)
Air Connections:
Combination barb fitting for 5/32-in. and l/4-in. (4 mm
and 6 mm) 0. D. plastic tubing
MAINTENANCE
Equipment Required
- Commercial cleaning solvent degreaser
- 0 to 30 psi (0 to 107 kPa) pressure gage
Cleaning
Remove all dirt and grease accumulation from the underside
of the actuator and around the packing nut and stem. Use
soivent if necessary.
A
A
I
.
WARNING
Use solvents in a well ventilated area. Avoid
prolonged inhalation of solvents or contact with the
skin. Careless handling of solvents can cause
permanent injury to the respiratory system and skin
tissue.
CAUTION
Do not allow solvent to come into contact with the
diaphragm as it will cause serious damage.
0
0
Adjust the system temperature controller through its
control range. The valve should operate to control the
flow of water as required to provide heating or cooling
(when both hot and chilled water are available).
Make sure the branchline pressure builds up to near full
main pressure when controller is set at the extreme end
of the throttling range. With the temperature controller
set at either extreme setting, full flow should occur.
There should be no flow at mid-pressure (see Table 1).
Adjustment
Make the following adjustments after repairing the VP522A
or B.
0
Vary the branchline pressure to the inlet port on the
VP522A. Note the pressure range at which no
movement (dwell) occurs.
Repeat above procedure for the VP522B.
Use a screwdriver or spring adjustment wrench to
adjust the tension of the spring on the VP522B by
turning the spring clockwise to reduce, or counter-
clockwise to increase, the switching point of no
movement. The switching point must be within the
VP522A dwell.
Operational Check
0 If a gage is not already present, insert a 0 to 30 psi (0
to 107 kPa) gage in the branch line.
75-2598

VP522A, B SEQUENCING WATER VALVE
TROUBLESHOOTING
For troubleshooting the VP522A or B, see Figure 2.
i
YES
REPACK VALVE AND
INSPECT INTERNAL
PARTS. REPLACE BENT,
BROKEN, OR WORN
PARTS
I
t
I
1
RESTORE VALVE/SYSTEM
TO OPERATION
I
BOILEFt’CHILLER
(4-)
+
YES
CHECK ACTUATOR
1
YES
REPLACE
DIAPHRAGM.
MAKE
OPERATIONAL
CHECK.
I
YES
CHECK
SYSTEM
Pr
PRESSURES
DISASSEMBLE VALVE AND
INSPECT FOR FOREIGN MATERIAL
OR BLOCKED PORTS. CHECK FOR
BROKEN PARTS. CLEAN AND I
REPLACE AS NECESSARY.
I
DISASSEMBLE VALVE.
REPLACE WORN SEATS
AND PLUGS. REPLACE
VALVE IF LOWER SEAT IS
DEFECTIVE.
1
YES
DISASSEMBLE VALVE.
INSPECT FOR FOREIGN
MATERIAL OR BENT STEM.
CLEAN OR REPLACE STEM
AND LUBRICATE.
I
RESTORE VALVE,’
SYSTEM TO
OPERATION
I
Fig. 2. VP522 Troubleshooting Flowchart.
75-2598

VP522A, B SEQUENCING WATER VALVE
REPAIR
Equipment Required
Valve Seat Removal Tool (available from Memphis
Service Center):
- CCT3843 - for l/2-in. 0. D. copper tubing (3/8-
in nominal) valve size
- CCT3833 -for 5/8- and 7/8-in. O.D. copper
tubing (l/2- and 3/4-in. nominal) valve sizes
14002734-001 Lubricant for stem, packing, and
packing nut
Lead Seal Number 2) or Crain packing of Teflon tape
for bonnet threads.
Diaphragm Replacement
Refer to Figure 3 and Table 3 while performing this
procedure.
Shut off air supply to VP522.
Disconnect air piping at actuator assembly.
Disengage slide from stem button.
Loosen the two socket head screws securing the
actuator assembly to the valve bonnet, and lift off
actuator assembly.
WARNING
The actuator is spring loaded via the large coil spring.
To avoid personal injury, carefully loosen the two
filister head screws from the spider base. Alternate a
few turns at a time while firmly holding the spider base
down against the spider.
Turn actuator upside down on a flat surface and
disassemble to remove spring load.
Turn actuator back over and remove top and
diaphragm.
Inspect diaphragm cup at this time. If the cup is badly
corroded, replace it.
Reassemble actuator assembly in reverse order with
new diaphragm.
Replace the actuator assembly on the valve bonnet and
tighten the two socket head screws.
Engage slide on the stem button.
Reconnect air piping.
Turn air supply back on.
Packing Replacement
Refer to Figure 3 and Table 3 while performing this
procedure.
@ Shut off air supply to VP522.
Q Remove actuator assembly as outlined in Steps 1
through 4 of DIAPHRAGM REPLACEMENT.
0 Remove the stem button and slide the brass tube off of
the stem and disc holder assembly. A hole is provided
near the top of the stem for insertion of an awl, nail, or
similar tool to hold the stem while removing or replacing
the stem button.
Remove packing nut.
Remove packing discs (3) and packing followers from
packing nut. Retain both packing followers. Discard old
packing.
Remove packing spring from valve bonnet.
Clean out packing nut and packing spring with a
commercial solvent degreaser.
AWARNING
Use solvents in a well ventilated area. Avoid
prolonged inhalation of solvents or contact with the
skin. Careless handling of solvents can cause
permanent injury to the respiratory system and
skin tissue.
Inspect the spring and replace if necessary.
Inspect the valve stem for scratches or abrasions, and
replace if necessary. See STEM AND DISC HOLDER
REBUILD KIT.
Lubricate packing spring, stem, and new packing.
Assemble packing discs (cup down) and previously
removed packing followers (bevel up) in the proper
sequence.
Slide packing spring over stem into valve bonnet.
Carefully screw packing disc and spring follower
“sandwich” over stem threads.
Apply light coating of lead seal or two wraps of Teflon
tape to bonnet threads.
Install packing nut, brass tube, and stem button.
Install actuator assembly on valve body and secure.
Restore system to operation.
Stem and Disc Holder Rebuild Kit
NOTE: When ordering a replacement stem and disc holder
rebuild kit listed in Table 4, a new brass tube, stem
button, setscrew, and three packing discs are also
included. When replacing the stem and disc holder
assembly, the other parts included should also be
replaced.
Refer to Figure 3 and Tables 3 and 4 while performing this
procedure.
Shut off air supply to the VP522.
Remove actuator assembly as outlined in Steps 1
through 4 of DIAPHRAGM REPLACEMENT. Remove
packing discs and packing followers as in Steps 2 and
3 of the PACKING REPLACEMENT section.
Remove valve bonnet for access to upper valve seat.
Inspect and replace the upper seat, if necessary, using
the required valve seat removal tool.
While the valve is open, check the integral lower seat in
the valve body for wear and clean out any foreign
matter that may be in the valve body. If the lower seat is
bad, replace the entire valve assembly.
Install the new stem and disc holder assembly and/or
upper seat.
Reassemble other parts in reverse order.
75-2598

VP522A, B SEQUENCING WATER VALVE
To assure correct stem stroke, tighten the valve bonnet
and pull up on the stem to take up the free travel of
approximately
1/16-in. With the stem raised (no free
travel), adjust the stem button so that the distance from
the top of the stem button to the top of the valve bonnet
is
3-15/1 6 in. (100 mm) for the VP522A, or 4-1/1 6 in.
(103 mm) for the VP522B.
Table 4. Stem and Disc Holder Rebuild Kit*.
0-S. No.
Part No.
VP522A1005
VP522A1039
VP522A1047
VP522A1070
VP522A1088
VP522A1 096
VP522A1237
VP522B1003
VP522B1011
1 VP522B1029 1
313824A
314459A
3144598
313824C
313824D
313824E
314459c
315407A
3
15408A
315408A
Without moving the stem button on the stem, tighten
the setscrew in the top of the stem button.
Put the actuator assembly back on.
Restore system to operation.
PARTS AND ACCESSORIES
Parts List
* Also includes stem button and set
screw, packing, and instructions.
See Figure 3 and Tables 3 and 4 for available VP522
replacement parts.
Table 3. VP522A and B Parts List (See Fig. 3).
Fig.
Key
No.
Part No. Description
2
3
4
4
5
6
7
a
9
10
10
10
10
11
12
13
14
15
16
17
17
18
19
20
21
22
23
23 314456
23
314462
24 See Table 4 Stem and Disc Holder Assembly
25
-
Valve Body
-
-
-
312760
~
309~~:~-zlo4?
-
-
-
-
313816-00063
314436-00065
315412
315413
-
-
-
-
314460
315409
310143
310137
310135
-
313825
Screw-8-32 x 1/2 in. slot head (4)
Lockwasher, No. 4 (4)
Actuator top
Diaphragm
1Diaphragm for Series 1 Valves
Diaphragm Cup and Support Assembly
Spider
Star Spring
Slide
Spring Plate
Spring for all A models except
A1039 and A1047
Spring for A1039 and A1047 models
Spring for B101 1 and
B1029 models
Spring for
B1003 model
Spring Retainer
Spider Base
Screw-1/4-20 x
3/8 in. socket head
Screw-1/4-20 x
3/4 in. filister head
Screw-1/4 x
1/4 in. socket head
Stem Button
Brass Tube for A models
Brass Tube for B models
Packing Nut
Packing Discs
(3)-cup down
Packing Follower (2)-bevel up
Packing Spring
Valve Bonnet
Valve Seat for all A models except
A1039, A1237, and A1047; for all
B models except
B1 011 and
B1029
Valve Seat for A1039, A1237, and
B1 011 models
Valve Seat for A1047 and B1029
models
Accessories
No accessories are available for the VP522A or B.
75-2598
6

VP522A, B SEQUENCING WATER VALVE
ACTUATOR ASSEMBLY
312817L
- ALL “A” MODELS
EXCEPT Al 039,
A1047, AND Al237
312817S - FOR A1039, A1047,
AND Al237 MODELa
312817W -FOR 81003 MODELS
312817Y -FOR
B1011 AND
B1029 MODELS
X2053-1
Fig. 3. VP522A and B Exploded View (SeeTable 3).
75-2598

Honeywell
Home and Building Control Home and Building Control
Honeywell Inc. Honeywell Limited-Honeywell Limitee
Honeywell Plaza 740 Ellesmere Road
P.O. Box 524
Scarborough, Ontario
Minneapolis, MN 55408-0524
MlP 2V9
Helping You Control Your World
75-2598
Rev. 6-92 Printed in U.S.A