CALEFFI 551006A, 551007A, 551008A, 551009A, 551028A Installation, Commissioning And Servicing Instructions

DISCAL® air separator

38456.11

www.caleffi.com

© Copyright 2018 Caleffi

551- 5517 - NA551 Series

Installation, commissioning and servicing instructions

Function

The DISCAL® air separator is used to continuously remove the air
contained in the hydronic circuits of heating and cooling systems.
The air discharge capacity of these devices is very high. They are
capable of removing automatically all the air present in the system
down to micro-bubble level.

The circulation of fully de-aerated water enables the equipment to
operate under optimum conditions, free from any noise, corrosion,
localized overheating or mechanical damage. Micro-bubbles, fusing
with each other, increase in volume (get larger) until they become
large enough to rise to the top where they are automatically
released.

This item is designed for use in closed hydronic systems. Do not use this item in plumbing applications. It does
not meet the low-lead plumbing standards of U.S. and Canada.

Product range

551 series DISCAL air separator for horizontal pipes, in brass compact with drain
Sizes ¾” integral sweat; ¾” NPT female (A without service check valve, AC with
service check)

551 series DISCAL air separator for horizontal pipes, in brass with drain

Sizes ¾” - 1” - 1 ¼” - 1 ½” - 2” NPT female; 1” - 1 ¼” - 1 ½” - 2” integral sweat
(A without service check valve, AC with service check)

551 series
Sizes

DISCAL air separator for horizontal pipes, in brass with drain

1” - 1 ¼” - 1 ½” - 2”

press (A without service check valve, AC with service check)

5517 series DISCAL air separator for horizontal or vertical pipes with rotating collar, in brass with
drain. Sizes

551 series DISCAL

¾” and 1” sweat union, press union and NPT male union

air separator for horizontal pipes, in steel with flanged connections with drain

Sizes 2” – 6” ANSI

NA551 series DISCAL air separator for horizontal pipes, in steel with flanged
connections with drain designed and built in accordance with Section

Scan to view

VIII, Division 1 of the ASME Boiler and Pressure Vessel Code and
tagged and registered with the National Board of Boiler and Pressure
Vessel Inspector, with ASME U-stamp. Sizes 2” – 12” ANSI.

Installation Tip

1

·

NA551 & 551 DISCAL

®

Technical specications

Brass air separator

Materials - body: brass

- internal element
(compact and rotating collar versions): 304 stainless steel

- internal element: glass reinforced nylon PA66GF30

- seal: peroxide-cured EPDM

- air vent float: PP

- air vent float linkages: stainless steel

- air vent float guide pin: stainless steel

Performance

Suitable fluids: water, glycol solution
Max. percentage of glycol: 50%
Max. working pressure: 150 psi (10 bar)
Temperature range: 32– 250°F (0–120°C)
Air separation efficiency: 100% to micro-bubble level

Connections - main:
compact series: 3/4" sweat; 3/4" NPT female
horizontal: 3/4", 1", 1-1/ 4", 1-1/ 2" and 2" NPT female
1", 1-1 /4", 1-1/ 2" and 2"integral sweat
1” ,1-1/4 ”,1-1/ 2” and 2” integral press
rotating collar version, 5517 series: ¾” and 1” sweat, press and NPT male union

- lay length (press connection): see page 4 and 5

- drain: 1/2" NPT female
5517 series: 1/2” straight female

Steel air separator

Materials - body: epoxy resin painted steel

- internal element: 304 stainless steel

- seal: peroxide-cured EPDM

- air vent float: PP

- air vent float linkages: stainless steel

- air vent float guide pin: stainless steel

Performance

Suitable fluids: water, glycol solution
Max. percentage of glycol: 50%
Max. working pressure: sizes 2-6”: 150 psi (10 bar); sizes 8-12”: 200 psi (14 bar)
Temperature range: 32–270°F (0 –132°C)
Air separation efficiency: 100% to micro-bubble level

Connections - flanged: 2"– 12" ANSI B16.5 150 CLASS RF

- drain pipe: sizes 2 - 6 inch: 1" NPT male

sizes 8 - 12 inch: 2” NPT male

Agency Approval

NA551 series is designed and built in accordance with Section VIII, Division 1 of the ASME Boiler
and Pressure Vessel Code and tagged and registered with the National Board of Boiler and
Pressure Vessel Inspector, and CRN registered (12” pending, contact Caleffi).

2

Working Pressure & Temperature Limits

(Solder Type Limits Per ASTM Std. B16.18-1979)

FLOW-CONTROL

STYLE

SWEAT

SAFETY INSTRUCTION

This safety alert symbol will be used in this manual to draw attention to safety related
instructions. When used, the safety alert symbol means.

ATTENTION! BECOME ALERT! YOUR SAFETY IS INVOLVED! FAILURE TO
FOLLOW THESE INSTRUCTIONS MAY RESULT IN A SAFETY HAZARD.

WARNING: This product can expose you to chemicals including lead, which is known

to the State of California to cause cancer and birth defects or other reproductive harm.
For more information go to www.P65Warnings.ca.gov.

CAUTION:

proper application, installation, and maintenance of systems in accordance
with all applicable codes and ordinances.

CAUTION: If the DISCAL valve is not installed, commissioned and

maintained properly, according to the instructions contained in this
manual, it may not operate correctly and may endanger the user.

TYPE OF
SOLDER

95-5

Tin-Antimony

50-50 tin-Lead 125 150

60-40 tin-Lead 75 250

All work must be performed by qualified personnel trained in the

MAXIMUM LIMITATIONS

PRESSURE PSI TEMPERATURE °F

150 250

CAUTION: Make sure that all the connecting pipework is water tight.

CAUTION: When making the water connections, make sure that the

pipework connecting the DISCAL is not mechanically over-stressed. Over
time this could cause breakages, with consequent water losses which, in turn,
could cause harm to property and/or people.

CAUTION: Water temperatures higher than 100°F (38°C) can be dangerous.
During the installation, commissioning and maintenance of the DISCAL valve,
take the necessary precautions to ensure that such temperatures do not
endanger people.

Leave this manual for the user

3

C C

Dimensions

C

A

A

C

D

E

A

D

E

A

F F

B

Code A B C D E F Wt (lb)

551003A*3⁄4" NPT 31⁄16" 23⁄16" 53⁄8" 67⁄8"1⁄2" 2.0

551022A*3⁄4" SWT 31⁄16" 23⁄16" 53⁄8" 67⁄8"1⁄2" 2.0

* Add suffix C to sweat and NPT code number when ordering the brass

DISCAL to ship with expansion tank service check valve, code561402A.

E

B

F

B

C

1/2

”

D

Code A B C D E F Wt (lb)

551705A3⁄4" NPT 51⁄8" 23⁄16" 53⁄8" 91⁄4" 31⁄2" 4.9

551765A3⁄4" press 63⁄8" 23⁄16" 53⁄8" 93⁄4” 31⁄2" 4.9

551795A3⁄4" SWT 6" 23⁄16" 53⁄8" 93⁄16” 31⁄2" 4.9

551706A 1" NPT 63⁄4" 23⁄16" 53⁄8" 93⁄4” 31⁄2" 4.9

551766A 1" press 63⁄4" 23⁄16" 53⁄8" 93⁄4” 31⁄2" 4.9

551796A 1" SWT 7" 23⁄16" 53⁄8" 93⁄4” 31⁄2" 4.9

551716* -- 33⁄4” 23⁄16" 53⁄8" 91⁄4" 31⁄2" 4.4

* Body only, no end connection fittings. Source separately, see Caleffi

catalog for end connection code numbers.

Code A Lay length

551765A3⁄4" press 4 5⁄8"

551766A 1" press 4 3⁄4"

4