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MINICAL
D
3/8”
A
1/8” NP TB3
1/8
”C1
7/8
”
C
A
D
B
A
1/8” NP TB3
11/16
”C1
7/8
”D3/8”
C
B
A
D
Weight (lb)
0.42
Code
502115A
Weight (lb)
0.38
Code
502015A
ACCREDITED
ISO 9001 No. 0003
ISO 9001 FM 21654
®
Automatic Air Vent
series 5020 - 5021
CALEFFI
01054/10 NA
Function
Automatic air vents are designed to remove trapped air that
accumulates in heating and air conditioning systems automatically.
Air removal enhances performance and life of a system by
reducing the affects of:
- corrosion due to the oxygen;
- pockets of air trapped in the heating emitters;
- cavitation in the circulation pumps.
The check valve on the 5021 series allows for easy replacement of
the air vent without purging the system.
Product range
Code 502015A MINICAL Automatic Air Vent 1/8" NPT
Code 502115A MINICAL Automatic Air Vent 1/8" NPT with Check Valve
Technical specification
Dimensions
Materials:
Body and cover: brass
Float: Polypropylene
Valve stem: brass
Vent wire lever: stainless steel
Spring: stainless steel
Seals: EPDM
Performance:
Medium: water and glycol solution
Max. working pressure: 150 psi (10 bar)
Max. venting pressure: 40 psi (2.5 bar)
Max. working temperature: - 502105A: 250°F (120°C)
- 502115A: 230°F (110°C)
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Flow rate
3.5
4.5
4.5
5.5
5.5
6.5
3.5
2.5
2.5
1.5
1.5
0.50
90
80
70
60
50
40
30
20
10
0
(bar) (psi)
SCFM (SCFM) (Nl/s)
0.1
0
0.5
0.9
0.8
0.7
0.6
0.4
0.3
0.2
0
0.25
0.5
0.75
1
1.25
1.5
1.75
2
0
0.25
0.5
0.75
1
1.25
1.5
1.75
2
Operation
CALEFFI
Flow curves
The accumulation of air bubbles in the valve body causes the float
to drop so that the air vent valve opens when the water pressure is
below the maximum venting pressure rating.
Construction details
Models with check valve
The check valve, part number
59474A, seals off the vent body with
an EPDM O-ring, allowing easy
maintenance by shutting off the
water flow when the vent is
removed. This feature also allows for
easy inspection of the air vent.
Hygroscopic cap (optional)
All MINICAL models can be
equipped with the optional
hygroscopic safety cap, part
number R59681. This special cap
contains cellulose fiber discs that
form a seal by increasing their
volume 50% when they become
wet. This prevents potential damage
in case of leakage.
Air flow (when filling the system)
SYSTEM PRESSURE AIR VENTING FLOW RATE
PSI BAR SCFM Nl/s
5 0.34 0.64 0.30
10 0.69 0.85 0.40
15 1.03 1.06 0.50
20 1.38 1.25 0.59
25 1.72 1.29 0.61
30 2.07 1.44 0.68
35 2.41 1.48 0.70
40 2.76 1.55 0.73
50 3.45 1.60 0.76
Installation
- The air vent is installed in the vertical position, on the air
separator, on manifolds, on riser pipes and generally in parts of
the system where a concentration of air pockets is expected.
- During operation the upper cap in the standard version must be
loosened If, however, the hygroscopic safety cap, pn R59681, is
used, completely hand tighten it.
- It is recommended that the standard vent cap be replaced with a
Caleffi R59681 hygroscopic safety cap in locations that
cannot be inspected.
SPECIFICATION SUMMARIES
Series 5020
Automatic air vent for hydronic systems using water and glycol solutions. 1/8” NPT Male threaded connection. Brass body and
cover, Polypropylene float, brass valve stem, stainless steel vent wire lever and spring, and EPDM O-Rings. Maximum working
pressure 150 psi (10 bar), maximum venting discharge pressure 40 psi (2.5 bar). Maximum working temperature 250°F (120°C).
Series 5021
Automatic air vent with the check valve for hydronic systems using water and glycol solutions. 1/8” NPT Male threaded
connection. Brass body and cover, Polypropylene float, brass valve stem, stainless steel vent wire lever and spring, and EPDM
O-Rings. Maximum working pressure 150 psi (10 bar), maximum venting discharge pressure 40 psi (2.5 bar). Maximum working
temperature 230°F (110°C).
We reserve the right to change our products and their relevant technical data, contained in this publication, at any time and without prior notice.
3883 West Milwaukee Road / Milwaukee, WI 53208
Tel: 414.238.2360 / Fax: 414.238.2366 / www.caleffi.us
Accessories
- Check valve, part number 59474A, for
automatic air vents 1/8” connection, brass.
- Hygroscopic safety cap, part number R59681.
- Small anti-suction air vent cap, part number
562100, for automatic air vents.
Caleffi North America, Inc.
© Copyright 2010 Caleffi
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