Honeywell VP525A, VP525C Installation Instructions Manual
VP525A,C
Pneumatic Radiator Valve
INSTALLATION INSTRUCTIONS
BEFORE INSTALLATION
This normally-open, single-seated, straight-through,
pneumatic valve provides two-position or proportional control
of two-pipe hot water or steam systems.
The valve can be installed in any position. The direction of
flow must be in the same direction as the arrow cast on the
valve body.
Refer to Fig. 1 for dimensions to determine the space required
for proper installation. Be sure to allow enough clearance
around the actuator top for servicing after installation.
1-1/2
(38)
1
2-1/4 DIAMETER (57)
AIR CONNECTION
FOR1/4 IN. (6 mm)
O.D. PLASTIC TUBING
SPECIFICATIONS
Body Pressure Rating: 150 psi (1034 kPa) maximum.
Controlled Medium Temperature (maximum):
VP525A: 180°F (82°C) maximum.
VP525C: 240°F (116°C) maximum.
Maximum allowable difference (alternating hot and cold
water): 140°F (78K).
Maximum Safe Air Pressure: 30 psi (207 kPa).
Maximum Differential Pressure for Quiet Service:
Water: 20 psi (138 kPa).
Steam (VP525C): 10 psi (69 kPa).
Close Off Ratings:
VP525A: See Fig. 2.
VP525C: See Fig. 3.
1-1/2
(38)
1
2-1/4 DIAMETER (57)
AIR CONNECTION
FOR1/4 IN. (6 mm)
O.D. PLASTIC TUBING
A
B
E
D
1
1-1/2 in. (38 mm) MINIMUM CLEARANCE TO REMOVE
ACTUATOR. 2 1/2 in. (63 mm) MINIMUM CLEARANCE
TO FACILITATE STRAIGHT ON TUBING CONNECTION.
IF CLEARANCE IS LESS THAN 2 1/2 in. (63 mm)
USE AN ELBOW.
M16449A
Fig. 1. VP525 threaded union body dimensions in in. (mm).
® U.S. Registered Trademark
Copyright © 2002 Honeywell International Inc.
All Rights Reserved
COVER FASTENER COVER FASTENER
A
B
D
C
BODY STYLE SIZE NPT
STRAIGHT THRU œ
MALE UNION OUTLET
ANGLE œ MALE
UNION OUTLET
1/2
3/4
1/2
3/4
A
3-1/2 (90)
3-1/2 (90)
3-1/4 (83)
3-1/8 (80)
B C D E
1-3/8 (35)
1-3/8 (35)
1 (25)
1 (25)
2-1/2
3
2-5/8
3
(63)
(76)
(66)
(76)
C
1-3/8 (35)
1-5/8 (41)
1-1/8 (29)
1-1/4 (32)
3/4
1-1/8
(19)
(29)
95-5544EF-1
VP525A,C PNEUMATIC RADIATOR VALVE
A
8
A
INSTALLATION
Actuator Spring Selection
Series 2 VP525C Valves are built with a orange (3-10 psi)
actuator spring. Shipped with the valve is a loose green
(2-5 psi) spring. If desired, you can replace the orange spring
with the green. To make this change, you must remove the
cover fastener (see Fig. 1).
Threaded Union Body Version
Typical applications of straight-through and angle pattern
union connected valves are shown in Fig. 4. The direction of
flow must be toward the union connected end (the same
direction as the arrow cast on the valve body).
Use proper piping methods when installing the threaded union
body to prevent distortion of the valve body (see Fig. 5).
The union tail piece, with the union nut in place, is attached to
the radiator with a suitable spud wrench. The valve body is
threaded into the supply piping then secured to the tail piece
by means of the union nut.
ACTUATOR
SPRING RANGE
PSI (kPa)
2-5
3-10
7 12
(48) (83)
9
14
(62)
(97)
11
16
(76)
(110)
13
18
(90)
(124)
15
20
(103)
(138)
22
17
(152)
(117)
24
19
(165)
(131)
26
21
CONTROL AIR PRESSURE PSI (kPa)
(179)
(145)
23
28
(159)
(193)
25
30
0
(172)
(207)
20
(0)
(138)
VP525A CLOSE-OFF
AT MAXIMUM SYSTEM PRESSURE
C
= 0.63
v
C
= 2.0
v
C
v
= 3.0
C
v
= 5.0
40
60
80
100
(276)
(414)
(552)
CLOSE OFF DIFFERENTIAL
PRESSURE RATINGS PSI (kPa)
(689)
120
(827)
140
(965)
C7713
ACTUATOR
SPRING RANGE
PSI (kPa)
2-5
3-10
9
14
(62)
(97)
11
16
(76)
(110)
13
18
(90)
(124)
15
20
(103)
(138)
22
17
(152)
(117)
24
19
(165)
(131)
26
21
CONTROL AIR PRESSURE PSI (kPa)
(179)
(145)
23
28
(159)
(193)
25
30
(172)
0 20 40 60 80 100 120 140
(207)
(0) (138) (276) (414) (552) (689) (827) (965)
VP525C CLOSE-OFF
AT MAXIMUM SYSTEM PRESSURE
C
C
C
v
C
v
= 5.0
CLOSE OFF DIFFERENTIAL
PRESSURE RATINGS PSI (kPa)
Fig. 3. VP525C close-off ratings.
STRAIGHT THROUGH ANGLE
Fig. 4. Threaded union body connections.
= 0.63
v
v
= 2.0
= 3.0
C7714
M1644
Fig. 2. VP525A close-off ratings.
95-5544EF–1 2
VP525A,C PNEUMATIC RADIATOR VALVE
2
EXCESS DOPE
MAY BLOCK DISC
OFF VALVE SEAT
LOOSE CHIPS
WRONG – TOO
MANY THREADS
PIPE SIZE
1/2 in. 1/2 in. (13 mm)
3/4 in. 9/16 in. (14 mm)
WRONG
VISE MAY SQUEEZE VALVE SEAT OUT OF
ROUND. IF VISE IS USED, GRIP ONLY THE
HEX NEXT TO PIPE BEING INSERTED.
VISE GRIPS HEX END NEXT TO PIPE
Fig. 5. Proper threaded valve installation practice.
TYPICAL OPERATION
An increase in control air pressure moves the valve stem
toward the closed position, modulating the flow through the
valve.
EFFECTIVE LENGTH
OF THREADS
RIGHT
RIGHT – FULL
THREAD (SEE TABLE)
VISE HOLDS PIPE
SECURELY
AGAINST TURNING
PARALLEL-JAW
WRENCH GRIPS HEX
OR FLATS NEXT TO PIPE
2 THREADS CLEAN –
MODERATE
AMOUNT OF DOPE
M16447
CONTROL
AIR
PRESSURE
VP525
SYSTEM
SUPPLY
Fig. 6. Typical operation.
C771
3 95-5544EF–1
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