Instructions

ManualsBrandsCaleffi ManualsBoiler System AccessoriesDiscal Air Separator, 2-1/2" Flange Connections

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. 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.

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

1” - 1 1/4” - 1 1/2" - 2" sweat

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

- Drain: 1/2” NPT female

Materials: - body: brass

- int. element: stainless steel (compact version)

PA66G30

- seal: EPDM

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

- Threaded 2” - 4” NPT male

- Drain: 1” NPT male

Materials: - body: epoxy resin painted steel

- int. element: stainless steel

- seal: EPDM

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)

DISCAL

air separator 551 Series

Installation, commissioning and servicing instructions

38456.06

www.caleffi.com

CALEFFI

Summary of content (6 pages)

PAGE 1
CALEFFI 38456.06 www.caleffi.com 551 Series DISCAL® air separator 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.
PAGE 2
Working Pressure & Temperature Limits (Solder Type Limits Per ASTM Std. B16.18-1979) FLOW-CONTROL STYLE NPT SWEAT TYPE OF SOLDER MAXIMUM LIMITATIONS PRESSURE PSI TEMPERATURE °F - 150 250 95-5 Tin-Antimony 150 250 50-50 tin-Lead 125 150 60-40 tin-Lead 75 250 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.
PAGE 3
6” 5” 4” 3” 2 1/2” 2” 2” Steel 1 1/2" 1 1/4" 1" ∆P (ft of wtr) 1 3/4" 3/4" C Hydronic characteristics (ft of wtr) (mm wtr) 1 300 0.9 0.8 0.7 0.9 0.8 0.7 250 200 0.6 0.6 0.5 0.5 0.3 0.3 0.25 0.25 0.2 0.2 0.12 0.12 0.1 0.1 0.06 0.06 0.05 0.05 0.035 0.03 0.035 0.03 0.025 0.025 0.02 0.02 0.45 0.4 0.35 0.45 0.4 0.35 0.18 0.16 0.14 0.18 0.16 0.14 0.09 0.08 0.07 0.09 0.08 0.
PAGE 4
Installation DISCAL units may be used in both heating and cooling systems, to ensure the progressive removal of air which is continuously formed. The units should preferably be installed after the boiler and on the pump suction side, as these are the points where the formation of micro-bubbles is greatest. DISCAL air separators must be installed vertically.
PAGE 5
Construction details DISCAL devices are constructed in such a way as to allow maintenance and cleaning operations to be carried out without having to remove the valve body from the pipework. All valves are fitted with a bottom connection for installing a drain valve. All internal air release control components are fully accessible in all the models. The automatic air release valve, located at the top of the units, has a long chamber for the movement of the float.
PAGE 6
The air eliminators with flanged connections have an integral drain point (A), which has two functions: 1. To aid the removal of air while filling the system during the commissioning stage. 2. To aid the removal of any debris that may float within the air eliminator. A 1/2" drain port fitted to the base of the device (B) provides the capability to remove any debris that has settled at the bottom of the air eliminator with drain valve part number 538402 FD.