Taco SR506-4 switching relay is the best choice for all your zoning needs, with advanced powerport cards, external diagnostic lights, switchable priority and contractor friendly PC board layouts. Combined with the time proven reliability of the 00 family of circulators and thermostats, total system integrating is achieved. External indicator lights provide instant diagnostic feedback, making a snap of service calls or new installation start-ups.

• External indicator lights
• Switchable priority
• Priority protection
• Simplified wiring
• Sealed relays
• Fuse protected outputs
• Compact design
• 100% factory tested
• Isolated end switch
• Contractor friendly PC board layout
• Universal thermostat compatibility
• All circulator relay connections, including ZC/ZR, are rated 1/3 HP (6 amp full load, 36 amp locked rotor) at 120 VAC
• End switch connections are rated 24 VAC, 1 amp
• All thermostat connections supply a 24 VAC class 2 output

Sid Harvey Item #:SR506: Replaces Part #:'s : ERSR601,
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Taco SR506

Taco ZA024Q4A2 Actuator Head Zone Sentry Valves 24 VAC,
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Taco ZA024Q4A2

Taco air scoop's special design and internal baffles of Taco air scoops slow water velocity to separate the air from solution. Thanks to this design, Taco air scoops efficiently remove air to provide noiseless, air-free hydronic heating, cooling or combination systems. They also provide an economic way to integrate air elimination by the connection of either a plain steel or diaphragm expansion tank.

• 1-piece cast iron construction
• Never requires any servicing
• Engineered baffle separates air from water
• Each air scoop has a vent connection on top for the installation of a 1/8" Taco 400-3 or 416-1 Hy-Vent and 1/2" bottom tapping for a diaphragm expansion tank
• The 1-1/2 - 4" air scoops also have an additional top tapping for the connection of a plain steel expansion tank
• Water or water/glycol media

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Taco B153-14

Taco air scoop's special design and internal baffles of Taco air scoops slow water velocity to separate the air from solution. Thanks to this design, Taco air scoops efficiently remove air to provide noiseless, air-free hydronic heating, cooling or combination systems. They also provide an economic way to integrate air elimination by the connection of either a plain steel or diaphragm expansion tank.

• 1-piece cast iron construction
• Never requires any servicing
• Engineered baffle separates air from water
• Each air scoop has a vent connection on top for the installation of a 1/8" Taco 400-3 or 416-1 Hy-Vent and 1/2" bottom tapping for a diaphragm expansion tank
• The 1-1/2 - 4" air scoops also have an additional top tapping for the connection of a plain steel expansion tank
• Water or water/glycol media

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434-5

Taco 49MD-125T-2 Air Separator 1-1/4" Threaded

49MD-125T-2

Taco 49-125P Air Separator 1-1/4" Press (Brass)

49-125P

Taco 49-100P Air Separator 1" Press

49-100P

Taco 416-2 Slim Line Air Vent, 1/8", MNPT, 150 psi, 140 - 240 deg F, Brass

• Vents are easily serviceable, if needed, by simply unscrewing the vent cap
• 115 psi maximum discharge pressure
• Non adjustable, straight mount, bubble breaker, float style

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Taco 416-1V

Taco Air Vent B157-5 1/8" MPT (Float Type),
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Warwick Hanger B157-5

Taco 418-4 Air Vent 3/4" MPT X 1/2 FPT
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418-4

Taco 418 Air Vent 3/4" MPT X 1/2 FPT
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Taco 418

Taco 49-150C-2 Automatic Air Separator, 1-1/2", Sweat, 150 psig, 25 - 240 deg F, 49 Cv, 5 fps Maximum, 42 kilo-VAC, Brass, 5-7/16" W x 7-9/16" H

• 42 kilo-VAC rating
• Removes unwanted air from closed loop heating and cooling systems to help increase efficiency and eliminate noise
• Water or water/glycol media
• Features bi-directional flow, patented pall ring design
• Minimal pressure loss, vent can be closed
• Large surface contact area, protective vent plate
• Rugged dependability, maximum air removal
• Convenient expansion tank connection tapping, bi-directional flow
• Stainless steel pall rings
• Stainless steel, EPDM, viTon, brass and engineered plastics venting unit components

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49-150C-2