L41../L61.. SERIES THERMOSTAT (AQUASTAT) PRODUCTION HANDBOOK APPLICATION The L41../L61.. series aquastats are primarily designed for application on water filled heating systems and systems for hot water supply, mainly domestic use. Contents Subject to change without notice. All rights reserved. General page Description of device functions ......................................... 2 Description ........................................................................ 3 Overview/selection guide .........
DESCRIPTION OF DEVICE FUNCTIONS The Micro Switch mechanism is intended to control electrically a burner, a relay, etc. in dependency of the temperature changes in a heating system. On choice the Micro Switch mechanism can be delivered with the following contact arrangements: • Single Pole Single Throw, C-1 breaks on temperature rise • Single Pole Double Throw, C-1 breaks on temperature rise. C-2 makes on temperature rise. The contacts are connected to 6.
DESCRIPTION The L41../L61.. series aquastats can be divided in the following main types: • Controller Controls the water temperature in accordance with the setting of an external knob (TÜV-type TR) • Recycling limit control Limits the water temperature below or above an adjusted level and resets automatically. This type has a greater differential and no external knob (TÜV-type TW). • Thermal cut-out with external reset button (manual reset) Limits the water temperature on a maximum adjusted level.
OVERVIEW/SELECTION GUIDE Application Single Aquastat thermostats Controller or limiter thermostat Dual Aquastat thermostats Controller and limiter thermostat with standard sensing element Direct mount (immersion) L4188A, B, C 25 ... 95°C 40 ... 110°C 70 ... 140°C L6188A, B, C 25 ... 95°C 40 ... 110°C 70 ... 140°C L4189A, B, C 25 ... 95°C 40 ... 110°C 110 ... 230°F L6189A, B, C 25 ... 95°C 40 ... 110°C 70 ... 140°C 110 ...
FEATURES • 6.3 mm quick connect terminals for receptacles • Mounting either in a horizontal or vertical position. • Housing is provided with two mounting holes which are suitable for M4 thread forming screws, for mounting on a control panel. • Cable entry in the conduit box is suitable for Pg 13.5 conduit or is provided with a plastic grommet (at choice). • The high and low setpoint stops are field adjustabe with steps of 2.5°C.
L4188 - L6188 SINGLE AQUASTAT - DIRECT IMMERSION APPLICATIONS AND ORDERING INFORMATION Application L4188 and L6188 are sensitive, immersion-type water temperature thermostats for controlling and limiting boiler water temperature in hydronic heating systems. The thermostat has a liquid-filled sensing element which fits into an immersion well (order separately) for direct mounting into a boiler, tank or other vessel. Ordering information O.S.
L4188 - L6188 SINGLE AQUASTAT - DIRECT IMMERSION Specifications Immersion wells, see page 18 Ambient temperature limits 0 ... 70°C C 1 Electrical connection 6.3 mm spade terminals + 2 C 1 + Enclosure IP40 Electrical rating 10 A at 250 Vac, resistive load 2.5 A at 250 Vac, inductive load 15 A at 250 Vac, locked motor 250 mA at 30 mVdc (special option) SPST SPDT Fig. 1.
L4189 - L6189 SINGLE AQUASTAT - PANEL MOUNTING (IMMERSION) APPLICATIONS AND ORDERING INFORMATION Application L4189 and L6189 are sensitive, immersion-type water temperature thermostats for controlling and limiting boiler water temperature in hydronic heating systems. These thermostats are designed for panel mounting and are supplied with a remote bulb and a liquid-filled sensing element which fits into an immersion well (order separately) for mounting into a boiler, tank or other vessel.
L4189 - L6189 SINGLE AQUASTAT - PANEL MOUNTING (IMMERSION) SPECIFICATIONS AND DIMENSIONS Specifications Ambient temperature limits 0 ... 70°C Accessories Immersion wells, see page 18 Electrical connections 6.3 mm spade terminals C 1 + Enclosure IP40 Electrical rating 10 A at 250 Vac, resistive load 2,5 A at 250 Vac, inductive load 15 A at 250 Vac, locked motor 250 mA at 30 mVdc (special option) SPST 2 C 1 + SPDT Fig. 3.
L6190 SINGLE AQUASTAT - SURFACE MOUNTING APPLICATION AND ORDERING INFORMATION Application The L6190 is a sensitive water temperature thermostat designed for surface mounting on domestic hot water cylinders or pipe work. The SPDT switching action is accomplished by a snap-action microswitch actuated by the temperature sensing element. The L6190 is supplied complete with mounting strap for rapid and easy installation. Draining of the system or tapping of the cylinder or pipe work is not required.
L6190 SINGLE AQUASTAT - SURFACE MOUNTING SPECIFICATIONS AND DIMENSIONS Specifications Ambient temperature limits 0 ... 70°C Capilliary length 55 mm Electrical connection 6.3 mm spade terminals or screw terminals 2 C 1 + Enclosure IP40 Electrical rating 10 A at 250 Vac, resistive load 2,5 A at 250 Vac, inductive load 15 A at 250 Vac, locked motor SPDT Fig. 5. Internal schematic L6190 Terminal data C-1 breaks and C-2 makes on temperature rise 48 24 26.5 66 12 72 100 92 9 30 51 24 Fig. 6.
L4191 - L6191 DUAL AQUASTAT - DIRECT IMMERSION APPLICATION AND ORDERING INFORMATION Application L4191 and L6191 are dual units in which two independently working water temperature thermostats are housed in one cover. Each thermostat has a separate liquid filled sensing element which fits into a common immersion well for direct mounting into a boiler, tank or other vessel.
L4191 - L6191 DUAL AQUASTAT - DIRECT IMMERSION SPECIFICATIONS AND DIMENSIONS Specifications Ambient temperature limits 0 ... 70°C C 1 C 1 Electrical connection 6.
L6188A 2044 TRADELINE SINGLE AQUASTAT - DIRECT IMMERSION APPLICATIONS AND ORDERING INFORMATION Application L6188A 2044 Tradeline Aquastat is a sensitive immersion-type water temperature thermostat for regulating and limiting boiler water temperature in hydronic heating systems. The Honeywell Tradeline technique of using adapters enables the L6188A 2044 Aquatat thermostat to field replace Honeywell Aquastat thermostats as well as many competitive devices (using the existing well*).
L6188A 2044 TRADELINE SINGLE AQUASTAT - DIRECT IMMERSION SPECIFICATIONS AND DIMENSIONS Specifications Temperature range 40 ... 110°C Accessories Immersion wells, see page 18 Differential 4 ... 10 (adjustable) 2 C 1 + Limit stops: Low limit: adjustable, factory set at 50°C High limit: adjustable, factory set at 95°C Ambient temperature limits 0 ... 70°C SPDT Electrical connection 6.3 mm spade terninals Fig. 9.
PERFORMANCE Ambient temperature error Fixed switch differential On controls and recycling limits a fixed differential of: 4 ± 1.5°C, 8 ± 3°C or 12 ± 3°C is supllied as a standard. Ratio of ambient error With capilliary lenth of 1000 mm With capilliary lenth of 50 mm Optional are: 7 ± 2.7°F, 14 ± 5.4°F 15 ± 5.4°F Time constant • With well τ ≤ 30 s for panel mounted, single direct mounted, dual direct mounted and triple direct mounted Aquastats.
CONSTRUCTION Dual direct mounted Aquastat needs the following extra parts • Two single thermoplastic conduit boxes (a right and a left one) with cable entry. • A dual thermoplastic front cover to protect against touching of live parts. • A thermoplastic top cover for covering of units with internal setting. • An adjustable dial for the Micro Switch differential (if applicable). • A bracket on the rear side of the Aquastat to connect both basic units together and which fits into a dual well.
ACCESSORIES AND SPARE PARTS Single well assembly Description Ordernumber Spud thread: 1/2” BSPT Maximum insertion length (including thread): 105 mm Suitable for Ø 5 mm sensor Spud thread: 1/2” BSPT Maximum insertion length (including thread): 170 mm Suitable for Ø 5 mm sensor 45.900.409-003 Packing qty (pcs) 40 45.900.409-006 100 Description Ordernumber Spud thread: 1/2” BSPT Maximum insertion length (including thread): 105 mm Suitable for two Ø 5 mm sensors. 45.900.
Miscellaneous Description Knob assembly Scale range: 110 ... 230°F, high limit stop: 180°F Knob assembly Scale range: 40 ... 110°C, high limit stop: 82°C Strap set for L6190 surface mounted aqustat Strap length: 2000 mm Key number 1 2 3 4 5 6 7 Ordernumber Packing qty (pcs) 45.900.427-002 200 45.900.427-003 200 45.900.443-001 50 Description Part number Fixing screw for front covers of single and dual aquastats Knob Scale range Low limit stop High limit stop 40 ... 110°C 70 ... 140°C 25 ...
QUALITY ASSURANCE STATEMENT Products are manufactured under an ISO 9001 (1994) based and certified Quality System. Assembly processes are guided by work instructions. Patrol inspections form part of the assembly processes. The quality system is described in the Honeywell Combustion Controls Center Quality Assurance Programme and its related operational procedures and instructions. At the end of the assembly phase, all aqustats are leakage and performance tested/adjusted.
ORDERING INFORMATION When ordering specify • Setting point(control and limit if necessary) • Type of contact (SPDT/SPST/ electrical rating) • Number of sensing point (single/dual) • Type of mounting (direct immersion/panel/surface) • Differential (adjustable/fixed/manual reset) • Capillary length Ordering Specification number L 4 1 X X A 9999 L: Aquastat Specification number Control contact: 4: SPST 6: SPDT A: Single: Dual: B: Single: Dual: C: Single: 1: Family 88: 89: 90: 91: 92: knob setting autom
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