Specification

ManualsBrandsResideo ManualsHVAC AccessoriesHi-Limit Aquastat

THE L4080 AND L8080 ARE IMMERSION

TYPE CONTROLLERS FOR HYDRONIC

HEATING SYSTEMS THAT TURN OFF THE

BURNER WHENEVER THE BOILER WATER

TEMPERATURE RISESTOTHESET POINT.

0 L4080 High Limit Aquastat Controller has

adjustable set point.

Cl L4080 models available for use with

immersion wells or for direct immersion if

faster response is needed.

0 A factory-set stop is available on L4080 to

prevent setting the control at too high a

temperature.

Cl L4080 models available with second limit

switch to shut off all gas to the burner.

III L8080 EC0 gas shutoff has fixed set point.

0 Liquid fill in sensing element expands as

the boiler temperature rises.

Cl At the set point temperature, a diaphragm-

actuated snap switch breaks the power

supply to the burner primary control.

SM.

REV. 4-66m

Form Number 60-2101-2

@Honeywell Inc. 1966

Summary of content (7 pages)

PAGE 1
THE L4080 AND L8080 ARE IMMERSION TYPE CONTROLLERS FOR HYDRONIC HEATING SYSTEMS THAT TURN OFF THE BURNER WHENEVER THE BOILER WATER TEMPERATURE RISESTOTHESET POINT. 0 L4080 High Limit Aquastat adjustable set point. Controller has Cl L4080 models available for use with immersion wells or for direct immersion if faster response is needed. 0 A factory-set stop is available on L4080 to prevent setting the control at too high a temperature.
PAGE 2
SPEClFICATIONS I IMPORTANT THE SPECIFICATIONS GIVEN IN THIS PUBLICATION DO NOT INCLUDE NORMAL MANUFACTURING TOLERANCES. THEREFORE, THIS UNIT MAY NOT MATCH THE LISTED SPECIFICATIONS EXACTLY. ALSO, THIS PRODUCT IS TESTED AND CALIBRATED UNDER CLOSELY CONTROLLED CONDITIONS, AND SOME MINOR DIFFERENCES IN PERFORMANCE CAN BE EXPECTED IF THOSE CONDITIONS ARE CHANGED.
PAGE 3
SPECIFICATIONS OF SECOND LIMIT (L4080F.G): Leadwires: No. 14 stranded wire, l/32” insulation, Underwriters Laboratories and Canadian Standards Association approved for 105 C [221 F] service. Ending: l/4” brass, tin plated female quick-connects, crimped and soldered to leadwires; quickconnects insulated with nylon housing. Length: 39” f 1” from end to end (tip of switch to tip of quick connect). Functional Length (exposed length): 34-l 12” (l-l /2” insulation) or 33” (3” insulation).
PAGE 4
W-y l141 3, ,\ 16 A2 AYAILABLE IN t-’ ,794, ,116 6, ON L4066G. AS OPTIONS-_).5/6 FIG. 2-L4080D,G IN p2.1 mm, OR 5 IN ,127.o mm,. INSTALLATION DIMENSIONS IN in. [mm in brackets]. MVSTALLATION that will permit boiler water of average temperature to circulate freely about the element. 3. L4080A-insert in boiler tapping. Using wrench on hex nut only, tighten securely. Do not use the L4080 as a lever to tighten the connection. 4.
PAGE 5
POWERPILE THERMOSTAT (r**A*)OPERATOR COIL I 1 BROKEN LINES REPRESENT INTERNAL WIRING. L----u**Ar---! POWER UNIT COIL 2 PILOTSTAT n 3 VALVE POWER OPERATOR “NIT COIL. COIL. IO,,M I FIG. 3-L4080B,D; L8080A TYPICAL WIRING HOOKUP FOR 3 TERMINAL POWERPILE SYSTEMS. FIG. 4-L4080B,D; L808OA TYPICAL WIRING HOOKUI FOR 4 TERMINAL POWERPILE SYSTEMS. LINE VOLTAGE OPERATOR LINE VOLTAGE THERMOSTAT OR CONTROLLER n 1 POWER SUPPLY.
PAGE 6
(****A) I OPERATOR COIL L--7****r---? POWER “NIT FIG. 844080F,G TYPICAL WIRING HOOKUP FOR 3TERMINAL POWERPILE CONTROL SYSTEMS. (SUGGESTED AS FIELD REPLACEMENT ONLY; FOR NEW SYSTEMS, USE 4-TERMINAL MODEL.) I ‘IG. 7-L4080F,G TYPICAL WIRING HOOKUP FOR 4TERMINAL POWERPILE CONTROL SYSTEMS. n 1 POWER SVPPLY. PROVIDE TECTION AS REOVIREO. DISCONNECT MEANS ANOO”ERLOAD COIL PR .._^ FIG. lO-L4080F,G TYPICAL WIRING LINE VOLTAGE SYSTEMS. FIG. 9-L408OF,G TYPICAL WIRING HOOKUP FOR 24 V SYSTEMS.
PAGE 7
OPERATidN When the water temperature rises to the L4080 or LB080 set point, the liquid fill in the sensing unit expands, actuating a diaphram which interrupts the power supply to the burner primary control (L4080) or the Pilotstat power unit (L8080). When the L4080 interrupts powerto the burner primary control, the system automatically recycles when the water cools and the L4080 switch closes.