©Johnstone Supply eCatalog 216

HYDRONICS Controls

Combination Protectorelay And Hydronic Heating Controllers • Immersion-type aquastat controller and oil burner primary provide oil-fired hydronic heating • L39-031 has 5' armored capillary with remote sensor Specifications:

system high and low limit/circulator control • Use in intermittent ignition applications • Capable of zone control with zone valves • 45 second safety switch timing with manual reset • Includes heat-conductive compound • L37-825 mounts directly on burner; includes well adapter

• Maximum pressure on immersion well: 200 PSI • High limit: 130°F to 240°F range; 10°F fixed differential; SPST switch • Low limit/circulation: 110°F to 220°F range; 10°F to 25°F adjusted differential; SPDT switch

Fig. Order # Mfg. #

Mounting Vertical

A

B

L37-825 L39-031

A B

R8182D1079 R8182H1070

Junction Box

Multi-Function Aquastat ® Controllers • Used to regulate boiler water temperature in gas or oil-fired hydronic heating systems • Controller may be mounted in any position; no leveling required • All adjustments accessible inside front cover

• Push-in terminals for quick connecting • Single sensing element for easy installation Specifications:

• Low limit: 110°F to 220°F • High limit: 130°F to 240°F

Order # Mfg. #

Application

Switch Action Diff.

L39-942

L4081A1023 High/Low Limit

SPST SPST

10°F (High); 10 to 25°F (Low)

L39-944 L4081B1096 High Limit and Circulator

10°F Fixed

Electrical Ratings Full Load

Locked Rotor

Millivolt

Full Load

Locked Rotor

Millivolt

5.1A @ 240V

30.6A @ 240V

0.25 @ 0.25 to 12VDC

8.0A @ 120V

48.0A @ 120V

—

Universal Oil Electronic Aquastat ® Controller • Controls circulator, oil burner and boiler temperature • LED display shows status and diagnostic information • EnviraCOM™ compatible for local or remote diagnostics/monitoring

• Replaces L8124A,C, L7124U, L7148A, L7248A,C, L7224A,C, and L8148A controllers Specifications: • Operating range (low limit): 110°F to 220°F, 10°F to 25°F adjustable • Operating range (high limit): 130°F to 240°F, 5°F to 20°F adjustable

Order # Mfg. #

Mounting

Burner Circuit Type

L40-764 L7224U1002 Well Mount, Horizontal or Vertical Position, or Flush Mounted Remote from the Well

120V

Triple Aquastat Relays • Immersion-type controller combines high limit protection with low limit and circulator control • Use in forced hydronic systems, including domestic hot water • All models (except L39-952 ) can provide multi zone control with a separate circulator and relay for each zone • L37-826 and L39-949 include 3" insertion well • L37-826 has 1-1/2" insulation depth; L39-949 has 3" insulation depth

• L39-951 , L39-952 and L37-827 have large transformers and extra terminals for supplying power to low voltage zone valves Specifications: • Low limit: 110°F to 220°F adjustable; 10°F to 25°F adj. diff. • High limit: 130°F to 240°F adjustable; 10°F fixed differential

Order # Mfg. #

Mounting

Burner Circuit Type

Order # Mfg. #

Mounting

Burner Circuit Type

L37-826

L39-951 L39-952 L37-827

L8124A1007 Vertical

120V 120V 120V

L8124E1016 Horizontal/Vertical L8124G1020 Horizontal/Vertical L8124L1011 Horizontal/Vertical

24V

L39-949 L8124A1015 Vertical L39-950 L8124C1003 Horizontal

120V 120V

528

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