©Johnstone Supply eCatalog 216

HYDRONICS Boiler Controls

Low Water Cut-Offs For Steam Boilers Electric • For residential and commercial applications

Specifications: • Maximum ambient temperature: 120°F • Maximum water temperature: 250°F • Maximum steam pressure: 15 PSI • Voltage across probe to ground: 14VAC • Power consumption: 1.7 VA @ 24 VAC, 3.6 VA @ 124 VAC • Probe sensitivity: 7,000 ohms WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov Note: Model PS804 with foam compensator also available at your local Johnstone Supply location by special order

• Green LED multi-function test light • Red LED low water indicator light • Shorted probe indication • No blow-down required when mounted directly to boiler trappings • 24V meets ANSI specification Z21.13a • No lockout with loss of power if probe is in water • Increased probe sensitivity prevents nuisance shutdowns, and a new test feature diagnoses shorted probe problems at installation • L46-640 and L46-639 have manual resets

A

B

Fig. Order # — L46-639 — L46-640

Mfg. #

Model #

Reset Type

Volts

153601 153602 153827 153927

PSE-801-M-120 PSE-802-M-24

Manual Manual

120

24

L46-820 L46-821

A B

PSE-801-120 PSE-802-24

— —

120

24

Replacement Probe For Boiler Controls WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

Order #

Mfg. #

Model #

For Use With

L46-638

354140 PA-800-RX2 PS-802-RX2-24, PS-851-RX2-120, PS-801-RX2-24

No. 11 Switch • For series 61, 64, 67 ( L37-423 ), 69 ( L38-768 , L38-769 ), 70, 764 and 767 low water cut-off switch replacement • Two single-pole, single throw switches provided to control the water feeder and the low water cut-off

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

Order #

Mfg. # Model # Description

Volts

L38-776

309100 11

Low Water Cut-Off Switch

120/240

Low Water Cut-Off And Pump Controller • For boilers of any size with separate water columns • Designed for high pressure, high temperature service

• 1" NPT connections • Maximum pressure: 150 PSI boiler

• Electrical ratings for pump and cut-off circuits: 120VAC — maximum F/L amps 7.4; maximum L/R amps 44.4; 240VAC — maximum F/L amps 3.7; maximum L/R amps 22.2; 120VDC — maximum F/L amps 2.4; maximum L/R amps 24.0; 240VDC — maximum F/L amps 1.2; maximum L/R amps 12.0 • Amp rating for alarm circuit: 120VAC — 1A; 240VAC — 1/2A; 120VDC — 1/2A; 240VDC — 1/4A circuit • Pilot duty service: 120/240VAC, 345VA WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

• Float-actuated electrical switch controls boiler feed pump directly from the boiler water level • Keeps boiler water level within the limits recommended for maximum steaming efficiency and fuel economy • Includes a second switch, operating at a lower level, which provides a circuit for stopping the automatic burner and sounds an alarm • Snap switch • Can also be used as a cut-off and alarm on many high pressure hot water space heating boilers

Order #

Mfg. #

Model #

L86-136

171702

150S

537

JohnstoneSupply.com