©Johnstone Supply eCatalog 216

HYDRONICS Boiler Controls

SafGard Low Water Cut-Offs For Hot Water Boilers • Automatically shuts off burner in a low water condition to prevent boiler damage • Heavy-duty electro-mechanical design for long life • Low maintenance, no moving parts to wear or stick • Auto reset feature automatically re-energizes circuit upon return to safe water level • Manual reset feature requires manual reset if low water condition exists for 30 seconds or longer

• Test button allows operator to test control operation without lowering water level • L42-929 and L42-932 are equipped with shorter probe for mounting in standard reducing tees • L42-931 and L42-935 are compact models for applications with space limitations WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

A

B

Fig. Order #

Mfg. #

Model #

Reset Type Auto Reset

Volts

L42-929 L42-930 L42-931 L42-932 L42-933 L42-934 L42-935

A B C A B B D

45-245 45-750 45-1100 45-175 45-550 45-650 45-1150 45-1100M

24SV

24

750

Manual Reset

120

1100

Auto Reset w/ Test Button

24 24

— L49-050

1100M Auto Reset w/ Test Button

170SV Auto Reset

120 120 120 120

550 650

Manual Reset w/ Test Button Auto Reset w/ Test Button Auto Reset w/ Test Button

C

D

1150

Test-N-Check ® Valves For Hot Water Boilers

• Simplifies ASME CSD-1a code mandated testing of low water cut-offs by eliminating the need to drain the system • Includes one upper and one lower valve for mounting at crosses in equalizing lines • Restricts water flow when the low water cut-off blow-down valve is open

• Adjustable built-in vacuum breaker in upper valve provides rapid evacuation of water from the float chamber Specifications: • Maximum temperature: 250°F • Maximum pressure: 160 PSI WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

Order #

Mfg. #

Model #

Conn. Size

L38-771

195000

TC-4

1" NPT

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