©Johnstone Supply eCatalog 216

HYDRONICS Controls

Electric Zone Valves • The silent operation permits installation in or near rooms where noiseless operation is essential • Heavy bronze body with sweat or threaded connections • For heat pump and geothermal applications, Taco offers L37-906 , which has corrosion-resistant

internal parts designed to close against high head pumps (150' head); 24VAC, 60 Hz, 0.9A rating • L37-906 is a geothermal valve that eliminates water hammer • L38-555 is the replacement head for L37-906 WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

Order #

Mfg. # 570-2 571-2 572-3

Description Zone Valve Zone Valve Zone Valve

Conn. Size 1/2" SWT 3/4" SWT 1" SWT 3/4" FPT

Normal Flow Range 0 to 4.5 GPM 4.5 to 6.0 GPM 6.0 to 10.0 GPM 4.5 to 6.0 GPM

Temp. Range 40°F to 240°F 40°F to 240°F 40°F to 240°F 40°F to 240°F

Max. Working Pressure Pressure Drop Equiv. Ft.

L37-498 L37-499 L37-500 L37-906 L37-501 L38-555

125 PSI 125 PSI 125 PSI 125 PSI

10 20 60 20 — —

5101-G3 Zone Valve

555-050RP Replacement Head 555-173RP Replacement Head

— —

— —

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Hydronic Switching Relays • All switching relays are DPDT • Provides intermediate switching of a line voltage device from a 24VAC controller • Built-in transformer, external diagnostic lights, fuse protected, 0.18A current for use with thermostat

• Extended three-year warranty WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

Fig. Order #

Mfg. #

Description

F/L Amps

Width Height Depth 4-1/4" 5-1/4" 2-3/4" 10-1/4" 6-3/4" 2-3/4" 10-1/4" 6-3/4" 2-3/4" 10-1/4" 6-3/4" 2-3/4" 11-3/4" 7-1/2" 3" 10-1/4" 6-3/4" 2-3/4" 10-1/4" 6-3/4" 2-3/4" 11-3/4" 7-1/2" 3"

L46-420 L46-421 L46-422 L46-423 L46-424 L46-425 L46-426 L46-427

A A A A A B B B

SR501-4 SR502-4 SR503-4 SR504-4 SR506-4

1 Zone Relay

5.0

2 Zone w/Priority 3 Zone w/Priority 4 Zone w/Priority 6 Zone w/Priority

15.0 15.0 20.0 20.0

SR503-EXP-4 3 Zone w/Priority and PowerPort Option 20.0 SR504-EXP-4 4 Zone w/Priority and PowerPort Option 20.0 SR506-EXP-4 6 Zone w/Priority and PowerPort Option 20.0

A

B

EXP Control Accessories • Easy, plug-in connections to the EXP pump or zone valve relay controls

WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

Order #

Mfg. #

Description

L41-624 L41-625

PC700-2 PC705-2

Boiler Reset Control

Variable Speed Injection Mixing Control

Hydronic Zone Valve Controls • Works with 2-, 3- or 4-wired zone valves • Built-in transformer • End switches rated at 5A, 1/6 HP @ 120VAC • Allows use of multiple circulators in conjunction with zone valves

• External diagnostic lights, fuse protected • Extended three-year warranty WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

Fig. Order #

Mfg. #

Description

Max. output @ 24V

Width Height Depth 10-1/4" 6-3/4" 2-3/4" 10-1/4" 6-3/4" 2-3/4" 11-3/4" 7-1/2" 3" 11-3/4" 7-1/2" 3" 11-3/4" 7-1/2" 3" 11-3/4" 7-1/2" 3"

L46-428 L46-429 L46-430 L46-431 L46-432 L46-433

A A A A B B

ZVC403-4 ZVC404-4 ZVC405-4 ZVC406-4

3 Zone

40VA 40VA 80VA 80VA 80VA 80VA

4 Zone w/Priority

5 Zone

6 Zone w/Priority 4 Zone w/Priority 6 Zone w/Priority

A

B

ZVC404-EXP-4 ZVC406-EXP-4

525

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