Submittal Sheet

VP525A,C PNEUMATIC RADIATOR VALVES
75-5544EF 2
Table 1. VP525 Capacity Index, Pressure Range,
and Fitting Sizes.
a
Obsolete.
b
Quick-opening flow characteristic.
Fig. 2. VP525A close-off ratings at various
control air pressures.
Fig. 3. VP525C close-off ratings at various
control air pressures.
MAINTENANCE
Inspection and Cleaning
1. Inspect valve for leaks around the packing. If repacking
is necessary, see Packing Replacement section.
2. Check for secure: pneumatic lines and connection to
the valve.
WARNING
Personal Injury Hazard.
Careless handling of solvents can permanently
injure the respiratory system and skin tissue.
Use solvents in a well ventilated area. Avoid prolonged
inhalation of solvents and/or contact with the skin.
3. Use commercial cleaning solvent to remove all dirt and
grease accumulation from around the valve assembly.
Operational Check
1. Set thermostat above present space temperature. Valve
should open and space temperature gradually rise.
2. Set thermostat below present space temperature. Valve
should close and space temperature gradually drop.
3. Return thermostat to desired setting.
TROUBLESHOOTING
Equipment Required
The following are available from Honeywell Direct:
— 305923 Gage, 0 to 30 psi (0 to 207 kPa).
— CCT852 Pressure Bulb.
— CCT853 Plastic Tubing, 5/32 in. (4 mm) O. D.
— CCT1614B T-Fitting, 1/4 x 1/4 x 1/8 in. NPT.
Body Type
Fitting Size
O.D. in in.
C
v
Pressure Range
in psi (kPa)
Solder
a
5/8 1.6 2-5 (14-34)
3-10 (21-69)
8-11 (55-76)
7/8 2.5 2-5 (14-34)
3-10 (21-69)
8-11 (55-76)
Threaded 1/2 NPT
0.4
a
3-10 (21-69)
0.63 3-10 (21-69)
2.0 2-5 (14-34)
3-10 (21-69)
3.0 2-5 (14-34)
3-10 (21-69)
3.5
a,b
8-11 (55-76)
3/4 NPT 3.0 3-10 (21-69)
5.0 2-5 (14-34)
3-10 (21-69)
VP525A CLOSE-OFF
AT MAXIMUM SYSTEM PRESSURE
3-10
2-5
19
(131)
21
(145)
CONTROL AIR PRESSURE PSI (kPa)
20
(138)
15
(103)
17
(117)
18
(124)
13
(90)
16
(110)
11
(76)
9
(62)
7
(48)
14
(97)
12
(83)
ACTUATOR
SPRING RANGE
PSI (kPa)
0
(0)
20
(138)
40
(276)
60
(414)
80
(552)
100
(689)
CLOSE OFF DIFFERENTIAL
PRESSURE RATINGS PSI (kPa)
120
(827)
140
(965)
C7713
A
30
(207)
25
(172)
28
(193)
23
(159)
C
v
= 2.0
C
v
= 0.63
C
v
= 3.0
C
v
= 5.0
26
(179)
24
(165)
22
(152)
VP525C CLOSE-OFF
AT MAXIMUM SYSTEM PRESSURE
3-10
2-5
19
(131)
21
(145)
CONTROL AIR PRESSURE PSI (kPa)
20
(138)
15
(103)
17
(117)
18
(124)
13
(90)
16
(110)
11
(76)
9
(62)
14
(97)
ACTUATOR
SPRING RANGE
PSI (kPa)
0
(0)
20
(138)
40
(276)
60
(414)
80
(552)
100
(689)
CLOSE OFF DIFFERENTIAL
PRESSURE RATINGS PSI (kPa)
120
(827)
140
(965)
C7714
A
30
(207)
25
(172)
28
(193)
23
(159)
C
v
= 2.0
C
v
= 0.63
C
v
= 3.0
C
v
=
5.
0
26
(179)
24
(165)
22
(152)