Caleffi 551 User Manual

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CALEFFI

38456.06

DISCAL®air separator 551 Series

Installation, commissioning and servicing instructions

Function

Air separators are 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. Micro­bubbles, fusing with each other, increase in volume (get larger)
until they become large enough to rise to the top where they are
automatically released.

Product range

Series 551 DISCAL air separator compact, sizes 3/4” Sweat; 3/4” NPT female - 1/2” female drain
Series 551 DISCAL air separator with 1/2” female drain, sizes 3/4” - 1” - 1 1/4” - 1 1/2” - 2” NPT female
Series 551 DISCAL air separator with 1/2” female drain, sizes 1” - 1 1/4” - 1 1/2" - 2" Sweat
Series 551 DISCAL air separator with flanged connections, sizes 2” - 6” ANSI
Series 551 DISCAL air separator with male thread connections, sizes 2” - 4” NPT

Technical specifications

Brass body air separators

Connections: - Main: compact 3/4” sweat; 3/4” NPT female

Materials: - body: brass

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)

Steel body air separator

Connections: - Flanged: 2”–6” ANSI 150 CLASS

Materials: - body: epoxy resin painted steel

Suitable fluids: water, glycol solution
Max working pressure: 150 psi (10 bar)
Max percentage of glycol: 50%
Temperature range: 32–250°F (0–120°C)

- Drain: 1/2” NPT female

- int. element: stainless steel (compact version)

- seal: EPDM

- Threaded 2” - 4” NPT male

- Drain: 1” NPT male

- int. element: stainless steel

- seal: EPDM

3/4” - 1” - 1 1/4” - 1 1/2” - 2” NPT female

1

1” - 1 1/4” - 1 1/2" - 2" sweat

PA66G30

Working Pressure & Temperature Limits

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

FLOW-CONTROL

STYLE

NPT

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.

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

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.

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