Honeywell AQUASTAT L8124A, AQUASTAT L8124C, AQUASTAT L8124E, AQUASTAT L8124L, AQUASTAT L8124M User Manual.pdf

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L8124A,C,E,L and M

Aquastat® Relays

 

INSTALLATION INSTRUCTIONS

APPLICATION

SPECIFICATIONS

These immersion type controllers are used with forced hydronic heating systems that include domestic hot water service. All models provide high limit, low limit and circulator control. Table 1 lists the various models and their applications.

These Aquastat® relays have a diaphragm powerhead and MicroSwitch™ assembly that respond to temperature changes in the boiler water. L8124 can provide multizone control by using a separate circulator and R845 Relay for each zone. L8124E and L have large transformers and extra terminals for supplying power to low voltage valves. L8124L includes a large transformer and extra terminals for low voltage zone valves. L8124M is for use in a wood-coal/gas-oil multifuel heating system. Circulator is independently controlled by the thermostat.

Do not use these Aquastat® Relays where the pressure can exceed 100 psi (690 kPa) on the bulb if inserted directly or 200 psi (1380 kPa) when using an immersion well, or where the ambient temperature can exceed 150°F (66°C) at the case or 265°F (129°C) at the sensing element.

Low Limit:

Setting: 110°F to 220°F (43°C to 104°C), adjustable. Differential: 10°F to 25°F (6°C to 14°C), adjustable.

High Limit:

Setting: 130°F to 240°F (54°C to 116°C), adjustable. Differential: 10°F (6°C), fixed.

WARNING

Explosion Hazard.

Can cause serious injury, death or property damage.

Use this product only in systems with a pressure relief valve.

Table 1. Model Descriptions.

 

 

Can Be Used For

No. of V8043 Zone

Electrical Ratings

 

Burner

Valves Powered

 

 

Model

Control

Multizone With

Without Additional

 

 

Number

Circuit

Circulatorsa

Transformer

Burner Circuit

Circulator Circuit

L8124A

120V

Yes

Same as L8124A,C,L

120 Vac: 7.4A (full load),

 

 

 

 

circulator rating.

44.4A (locked rotor).

L8124C

 

 

 

 

 

 

 

240 Vac: 3.7A (full load),

 

 

 

 

 

L8124L

 

 

3

 

22.2A (locked rotor).

L8124E

24V

 

2

1.25A at 24 Vac; 30 VA

 

 

 

 

 

(total load) B1-B2, Tv-Z.

 

L8124M

120V

 

Same as L8124A.

None.

a Multizone control can be provided by using a separate circulator and R845 Relay for each zone.

® U.S. Registered Trademark

 

Copyright © 2001 Honeywell • All Rights Reserved

95-6571-11

 

L8124A,C,E,L AND M AQUASTAT® RELAYS

INSTALLATION

When Installing This Product…

1.Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous condition.

2.Check the ratings given in the instructions and on the product to make sure the product is suitable for your application.

3.Installer must be a trained, experienced service technician.

4.After installation is complete, check out product operation as provided in these instructions.

WARNING

Electrical Shock Hazard.

Can cause severe injury, death or equipment damage.

Disconnect power supply before beginning installation to prevent electrical shock or equipment damage.

IMPORTANT

1.Terminals on these Aquastat Relays are approved for copper wire only.

2.Immersion well must fit sensing element and

bulb must rest against bottom of well.

Bend the tubing, if necessary, to hold the bulb against the bottom of the well. Do not make a sharp bend in the tubing. A sharp bend can produce a break in the tubing and cause loss of fill. This condition will cause the high and low limit controllers to be continuously made.

Select models have an adjustable capillary length. See Fig. 1.

3

1

2

with the relay.) Refer to form 68-0040, Wells and Fittings for Temperature Controllers, to order well. A compression fitting is available for applications where direct immersion of the sensing bulb is desired. A 124904 Well Adapter (see Fig. 2) can be ordered separately to adapt some other wells to the mounting clamp. The boiler must be provided with a tapping that allows horizontal mounting of the well. It should be located where boiler water of average temperature can circulate around the well.

1.Turn off all power and drain the boiler.

2.If no tapping is provided, prepare one, properly sized and threaded, at the selected location.

3.Install the immersion well in the boiler tapping and tighten securely.

NOTE: Do not use the case as a handle to tighten.

4.Refill boiler and check for water leakage.

5.Loosen but do not remove the clamp screw on the bottom (L8124A,E) or on top (L8124C,L,M) of case.

6.Insert the element in the well until it bottoms. See Fig. 2.

7.Fit the case onto the well so that the clamp on the case slides over the flange on the well. Securely tighten clamp screw.

WIRING

WARNING

Electrical Shock Hazard.

Can cause severe injury, death or equipment damage.

Disconnect power before wiring to prevent electrical shock or equipment damage.

All wiring must comply with local electrical codes and ordinances. The limits given in the Specifications section must not be exceeded when applying this control. Terminals on these Aquastat Relays are approved for copper wire only.

Refer to the insert on the inside of the Aquastat Relay cover or to Table 1 for electrical ratings and maximum load information. Use manufacturer instructions when wiring controlled equipment or refer to typical hookups in Fig. 3 through 11.

CAUTION:

EXCESSIVE HANDLING OR SHARP BENDS CAN DAMAGE THE CAPILLARY.

1SENSING ELEMENT IS FACTORY FORMED FOR 1.5 IN. INSULATION WELL ASSEMBLIES.

2FOR 3 IN. INSULATION WELL ASSEMBLIES, PULL OUT SUFFICIENT CAPILLARY TO ASSURE THAT THE CAPSULE BOTTOMS IN THE WELL.

3STRAIGHTEN CAPILLARY SUFFICIENTLY SO IT DOES NOT

INTERFERE WITH INSERTION OF THE CAPSULE INTO THE WELL. M8882

Fig. 1. Adjusting the capillary length.

Mounting

Each relay is suitable for use with an immersion well for insertion into the boiler. (Check individual OS number specifications to determine whether a well is supplied

WARNING

Explosion Hazard.

Can cause severe injury, death or property damage.

Use this product only in systems with a pressure relief valve.

If the B1 terminal on the device being replaced is a 1/4 in. (6 mm) tab terminal, use the existing wiring harness terminals to install the replacement device. If the B1 terminal on the device being replaced is a screw terminal, insert the provided tab terminal to screw terminal adapter on the 1/4 in. (6 mm) tab terminal of the replacement device. After the adapter is installed, the existing wraparound wire end may be reused to make an electrical connection to the B1 terminal.

95-6571—11

2

 

 

L8124A,C,E,L AND M AQUASTAT® RELAYS

 

 

BACK OF

 

IMMERSION

CONTROLLER

 

CONTROLLER

 

WELL CLAMP

CASE

BOILER

CASE

 

 

 

 

 

IMMERSION

 

 

 

 

WELL CLAMP

 

 

 

 

 

1

 

 

 

IMMERSION

 

 

ADAPTER

WELL SPUD

 

 

 

 

 

 

ADAPTER

 

 

IMMERSION

 

 

OLD IMMERSION

WELL CLAMP

SENSING

 

 

 

 

WELL ASSEMBLY

SCREW

BULB

(A)

)

2

CAPILLARY

TUBE

SETSCREW

 

SHORT TUBE

IMMERSION

FITS IN CENTRAL

WELL CLAMP SCREW

RECESS OF ADAPTER

(D)

(B)

HEAT-CONDUCTIVE COMPOUND

1 BEND THE CAPILLARY TUBE TO HOLD THE SENSING BULB IN GOOD THERMAL CONTACT WITH THE IMMERSION WELL AT POINTS (A) AND (B).

2

ASSURE THAT CAPILLARY TUBE FITS FREELY IN THE ADAPTER SO THE TENSION OF THE CAPILLARY TUBE AT POINT (C) HOLDS THE SENSING BULB IN GOOD THERMAL CONTACT WITH THE IMMERSION WELL AT POINT (

M88

Fig. 2. Position of bulb in immersion well and use of well adapter when required.

 

LOW VOLTAGE

 

 

 

 

THERMOSTAT

 

 

 

 

 

 

L8124A,C

 

 

 

 

 

 

 

2

 

 

 

G

 

 

T

T

 

1

 

L1

 

 

 

 

 

(HOT)

 

 

 

2

 

L2

1K

 

 

 

 

1

W

R

B

 

1K1

 

 

 

 

 

 

 

LOW LIMIT/

 

 

 

 

 

CIRCULATOR

ZR

 

 

 

 

 

 

 

 

 

 

ZC

 

 

 

 

 

 

 

LINE VOLTAGE

 

B

 

 

 

OIL BURNER

 

 

HIGH

 

 

RELAY OR

 

1K2

 

3

GAS VALVE

 

LIMIT

 

 

 

 

 

 

 

R

 

 

B1

 

 

 

 

 

B2

 

 

 

 

 

C1

 

 

 

 

 

C2

 

 

 

 

 

 

LINE VOLTAGE

 

 

 

 

 

CIRCULATOR

1POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

2CONTROL CASE MUST BE CONNECTED TO EARTH GROUND. USE GROUNDING SCREW PROVIDED.

3

B1 IS 1/4 IN. TAB TERMINAL.

M8802

Fig. 3. L8124A,C single zone connections and internal schematic.

 

LOW VOLTAGE

 

 

 

 

THERMOSTAT

 

 

 

 

 

 

L8124E

 

 

 

 

 

 

 

2

 

 

 

 

G

 

TV

T

Z

 

 

 

 

 

 

 

1

L1

 

 

 

 

 

(HOT)

 

1K

 

 

2

L2

 

 

 

 

 

 

 

 

 

1

 

 

 

1K2

 

 

 

W

R

B

1K1

 

 

 

 

 

 

 

 

LOW LIMIT/

 

 

 

 

 

CIRCULATOR

 

 

 

 

 

 

R

 

LINE VOLTAGE

 

 

 

 

CIRCULATOR

 

 

HIGH

 

 

 

 

 

C1

 

 

 

LIMIT

 

 

 

 

 

 

 

 

 

 

B

 

 

 

 

 

 

C2

 

 

 

 

 

3

 

 

 

 

 

B1

TR

 

 

 

 

B2

TH

 

 

 

 

 

LOW VOLTAGE

 

 

 

 

 

GAS VALVE

 

 

 

 

 

(eg, VR8300)

1POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

2CONTROL CASE MUST BE CONNECTED TO EARTH GROUND. USE GROUNDING SCREW PROVIDED.

M8803

3 B1 IS 1/4 IN. TAB TERMINAL.

Fig. 4. L8124E single zone connections and internal schematic.

3

95-6571—11

L8124A,C,E,L AND M AQUASTAT® RELAYS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

T87F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L8124A

 

 

 

T87F

 

 

 

 

 

T87F

 

 

 

 

T

T

 

 

 

ZC

 

 

 

R845 RELAY

 

 

 

R845 RELAY

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

3

ZR

T

T

 

 

 

 

T

T

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

G

L2

L1

C1

C2

B2

B1

1

2

3

4

5

6

1

2

3

4

5

6

L2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(HOT)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PUMP

 

 

 

 

PUMP

 

 

 

 

PUMP

 

 

 

 

 

 

 

 

 

 

R8184

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

T

F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C554

 

 

 

 

 

 

 

 

 

 

 

 

 

T

F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BLACK

WHITE

 

ORANGE

 

 

BURNER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IGNITION

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

2 CONTROL CASE MUST BE CONNECTED TO EARTH GROUND. USE GROUNDING SCREW PROVIDED.

3

B1 IS 1/4 IN. TAB TERMINAL.

M8822

 

Fig. 5. L8124A in an oil-fired, forced hot water, tankless, zoned, pump system.

 

 

 

 

 

 

 

 

TO ADDITIONAL

 

 

LOW VOLTAGE

 

 

 

L1

L2

R845A RELAYS

 

 

 

 

2

(HOT)

1

FOR OTHER ZONES

 

 

THERMOSTAT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L8124A,C

 

 

 

 

 

 

 

 

 

 

 

G

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R845A RELAY ZONE 2

 

T

T

 

 

1

 

 

 

 

 

ZONE 2

 

 

 

 

 

 

 

CIRCULATOR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6

 

 

 

 

 

2

 

 

 

 

 

 

1K

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

 

W

R

 

B

 

 

 

 

 

3

 

 

1K1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LOW LIMIT/

 

 

 

 

 

 

 

 

 

 

CIRCULATOR

 

ZR

 

 

 

 

4

 

 

 

 

 

ZC

 

 

 

 

1

 

 

 

 

 

 

 

LINE VOLTAGE

 

 

 

B

 

 

 

 

OIL BURNER

 

2

 

 

 

 

 

 

RELAY OR

 

 

 

 

HIGH

 

 

 

 

 

 

1K2

3

 

GAS VALVE

 

 

 

 

LIMIT

 

 

 

ZONE 2

 

 

 

 

 

 

 

 

 

R

 

 

 

B1

 

 

 

 

LOW VOLTAGE

 

 

 

 

 

 

 

 

THERMOSTAT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B2

 

 

 

 

 

 

 

 

 

 

 

 

 

1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND

 

 

 

 

 

C1

 

 

 

OVERLOAD PROTECTION AS REQUIRED.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2 CONTROL CASE MUST BE CONNECTED TO EARTH

 

 

 

 

 

C2

 

 

 

GROUND. USE GROUNDING SCREW PROVIDED.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LINE VOLTAGE

3

 

 

 

 

 

 

 

 

CIRCULATOR

B1 IS 1/4 IN. TAB TERMINAL.

M8827

 

 

 

 

 

 

 

Fig. 6. L8124A,C multizone system with circulator connections and internal schematic.

95-6571—11

4

 

 

 

 

 

 

 

 

 

L8124A,C,E,L AND M AQUASTAT® RELAYS

 

ZONE 1

 

ZONE 2

 

 

 

1

 

 

 

 

 

 

 

 

 

 

 

L1

 

 

 

 

 

 

 

THERMOSTAT

THERMOSTAT

 

 

 

 

 

 

 

 

 

 

 

 

 

(HOT)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

V8043F

 

V8043F

 

 

 

L2

 

 

 

 

T87F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

TH

TH

TR

TH

TH

TR

 

 

 

G

L2

L1

T

T

L8124E

TR

TR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

 

 

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C1

C2

B2

B1

 

 

 

 

 

L8124G,L

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

G

 

 

 

 

 

 

 

 

 

 

TV

T

Z

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

L1

 

 

 

 

 

 

 

TH

TR

 

 

 

 

 

(HOT)

 

 

 

 

 

 

 

 

 

 

1K

 

 

 

 

 

CIRCULATOR

 

LOW VOLTAGE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

L2

1

 

 

 

 

 

GAS VALVE

 

 

 

 

 

 

 

 

 

 

(eg, VR8300)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1K1

 

 

1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND

 

W

R

B

ZR

 

 

 

 

OVERLOAD PROTECTION AS REQUIRED.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LOW LIMIT/

 

 

 

 

2 CONTROL CASE MUST BE CONNECTED TO EARTH GROUND.

 

 

CIRCULATOR

 

 

 

 

 

USE GROUNDING SCREW PROVIDED.

 

 

 

 

 

ZC

 

 

 

3

B1 IS 1/4 IN. TAB TERMINAL.

 

 

 

 

 

 

 

 

 

LINE VOLTAGE

 

 

M1796A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B

 

 

OIL BURNER

 

 

 

 

 

 

 

 

 

 

1K2

HIGH

 

 

RELAY OR

 

Fig. 8. L8124E in a 24Vac, gas-fired,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LIMIT

 

4

GAS VALVE

 

forced hot water, tankless system.

 

 

 

 

 

 

 

 

 

 

 

 

R

B1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LINE VOLTAGE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CIRCULATOR

 

 

 

 

 

 

 

 

1POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

2UP TO TWO V8043F ZONE VALVES CAN BE POWERED WITH L8124G,L. ADD ADDITIONAL TRANSFORMER FOR EVERY TWO OR LESS VALVES.

3CONTROL CASE MUST BE CONNECTED TO EARTH GROUND. USE GROUNDING SCREW PROVIDED.

4 B1 IS 1/4 IN. TAB TERMINAL.

M1795B

Fig. 7. L8124 multizone system with zone valve connections and internal schematic.

5

95-6571—11

L8124A,C,E,L AND M AQUASTAT® RELAYS

T87F

T87F

 

T87F

 

R845 RELAY

R845 RELAY

R845 RELAY

T

T

 

 

 

 

T

T

 

 

 

 

T

T

 

 

 

 

1

2

3

4

5

6

1

2

3

4

5

6

1

2

3

4

5

6

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(HOT)

PUMP

 

 

 

 

PUMP

 

 

 

 

PUMP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

G L2

L1

T

T

 

TH

LOW VOLTAGE

 

 

 

 

 

 

 

 

 

 

GAS VALVE

C1

C2

B2

B1

3

 

TR

(eg, VR8300)

 

 

 

 

 

L8124E

 

 

 

 

 

 

AQUASTAT® RELAY

 

 

 

 

1POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

2CONTROL CASE MUST BE CONNECTED TO EARTH GROUND. USE GROUNDING SCREW PROVIDED.

3B1 IS 1/4 IN. TAB TERMINAL.

M1794A

Fig. 9. L8124E in a 24 Vac, gas-fired, forced hot water, tankless, zoned pump system.

 

 

 

 

 

1

 

TO ADDITIONAL

 

 

 

 

 

 

L2

L1

R845A RELAYS

 

 

 

 

 

 

FOR OTHER ZONES

 

 

 

 

 

 

 

(HOT)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R845A RELAY ZONE 1

 

 

 

 

 

 

 

 

 

 

6

 

 

 

 

 

 

 

 

 

 

5

 

 

 

 

L8124E

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

3

 

 

 

 

 

G

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TV

T

Z

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

 

4

 

 

 

 

 

 

 

 

 

 

 

 

1K

 

 

2

 

 

 

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1K2

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ZONE 1

 

 

W

R

B

1K1

 

 

 

 

LOW VOLTAGE

 

 

 

 

 

 

 

 

THERMOSTAT

 

 

LOW LIMIT/

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CIRCULATOR

 

 

 

 

 

 

 

 

 

 

 

R

 

 

 

 

 

ZONE 1

 

 

 

HIGH

 

C1

 

 

 

 

CIRCULATOR

 

 

 

LIMIT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B

 

 

 

 

 

 

 

 

 

 

 

C2

 

 

 

 

 

 

 

 

 

 

3

 

 

 

 

 

 

 

 

 

 

B1

TR

 

 

1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND

 

 

 

 

 

 

 

 

OVERLOAD PROTECTION AS REQUIRED.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

THTR

 

 

 

 

 

 

 

 

B2

TH

 

 

2 CONTROL CASE MUST BE CONNECTED TO EARTH

 

 

 

 

 

 

 

 

 

 

GROUND. USE GROUNDING SCREW PROVIDED.

 

 

 

 

 

 

LOW VOLTAGE

 

3

B1 IS 1/4 IN. TAB TERMINAL.

M8828

 

 

 

 

 

GAS VALVE (eg, VR8300)

 

 

 

 

 

 

 

 

Fig. 10. L8124E multizone system with circulator connections and internal schematic.

95-6571—11

6

L8124A,C,E,L AND M AQUASTAT® RELAYS

LOW VOLTAGE

 

 

 

 

 

 

 

 

THERMOSTAT

 

 

 

 

 

 

 

 

ZONE 1

 

 

 

1

 

TO ADDITIONAL

 

 

 

 

 

L1

L2

R845A RELAYS

 

 

 

 

 

FOR OTHER ZONES

 

 

 

 

 

(HOT)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L8124L

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

G

 

 

 

 

 

TV

T

Z

 

 

 

 

 

R845A RELAY ZONE 2

 

 

 

 

 

 

 

 

 

 

ZONE 2

 

1K

 

 

1

 

 

 

 

CIRCULATOR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

1K1

 

 

 

5

 

 

 

 

 

 

 

 

 

 

 

W

R

B

ZR

 

 

 

3

 

 

 

 

 

 

 

 

 

 

 

LOW LIMIT/

 

 

 

 

 

 

 

 

CIRCULATOR

 

 

 

 

 

 

 

 

 

 

 

ZC

 

 

 

4

 

 

1K2

 

B

 

 

 

 

1

 

 

HIGH

 

3

 

 

 

 

 

 

 

LIMIT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R

B1

 

 

 

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LINE VOLTAGE

 

 

ZONE 2

 

 

 

 

 

OIL BURNER

 

 

 

 

 

 

 

 

 

LOW VOLTAGE

 

 

 

 

B2

RELAY OR

 

 

 

 

 

 

 

 

THERMOSTAT

 

 

 

 

C2

GAS VALVE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND

 

 

 

 

C1

 

 

 

OVERLOAD PROTECTION AS REQUIRED.

 

 

 

 

 

LINE VOLTAGE

 

2

CONTROL CASE MUST BE CONNECTED TO EARTH

 

 

 

 

CIRCULATOR

 

 

GROUND. USE GROUNDING SCREW PROVIDED.

 

 

 

 

ZONE 1

 

 

 

 

 

 

 

 

 

 

 

 

3

B1 IS 1/4 IN. TAB TERMINAL.

M8829

Fig. 11. L8124L multizone system with circulator connections and internal schematic.

OPERATION

High Limit Controller

The high limit opens and turns off the burner when the water temperature reaches the setpoint. The high limit automatically resets after the water temperature drops past the setpoint and through the 10°F (6°C) differential.

WARNING

Explosion Hazard.

Can cause serious injury, death or equipment damage.

Use this product only in systems with a pressure relief valve.

Low Limit and Circulator Controllers

On a temperature rise, with the adjustable differential at the minimum setting of 10°F (6°C), the burner circuit (R-B) breaks and the circulator circuit (R-W) makes at the control setpoint. On a temperature drop of 10°F (6°C) below the setpoint, the R-B circuit makes and the R-W circuit breaks. See Fig. 12.

At any differential setting greater than 10°F (6°C), the R-B make temperature and the R-W break temperature remain the same (control setting minus 10°F [6°C]). The R-B break and R-W make temperature are the setpoint temperature plus the difference between the differential setting and 10°F (6°C).

EXAMPLE: Setpoint of 140°F (60°C), differential set at 25°F (14°C). On a temperature rise, R-B breaks and R-W makes at 155°F (68°C). On a temperature fall, R-B makes and R-W breaks at 130°F (54°C).

 

SWITCH BREAKS ON

 

TEMPERATURE RISE.

 

BURNER TURNS OFF.

HIGH LIMIT

CIRCULATOR OPERATES

SETTING

ON A CALL FOR HEAT.

 

SWITCH MAKES ON

 

TEMPERATURE FALL.

 

BURNER OPERATES ON A

 

CALL FOR HEAT.

 

SWITCH MAKES R-W

 

AND BREAKS R-B ON

LOW LIMIT

TEMPERATURE RISE.

AND

1

 

CIRCULATOR

 

SETTING

SWITCH MAKES R-W

 

AND BREAKS R-B ON

 

TEMPERATURE RISE.

 

SWITCH MAKES R-B AND

 

BREAKS R-W ON

 

TEMPERATURE FALL.

 

BURNER IS ON TO

 

MAINTAIN MINIMUM

 

WATER TEMPERATURE.

 

CIRCULATOR IS OFF.

1WHEN WATER REACHES PROPER TEMPERATURE, THE BURNER SHUTS OFF OR THE CIRCULATOR PUMP STARTS (WHEN CALLING

FOR HEAT).

M1523

Fig. 12. Relationship of setpoints and differential.

7

95-6571—11

L8124A,C,E,L AND M AQUASTAT® RELAYS

On the L8124M, the burner and circulator circuits are separately controlled; the low limit controls the burner circuit (R-B) as described above, while the low voltage thermostat directly controls the circulator circuit.

See Fig. 13.

 

 

LOW VOLTAGE

 

 

 

 

 

 

THERMOSTAT

 

 

 

 

 

 

L8124M

 

 

2

 

 

 

 

 

G

 

T

T

 

 

 

L1

L1

 

 

 

 

 

(HOT)

 

 

 

 

 

 

 

 

 

 

 

L2

L2

 

1K

 

 

 

 

1

 

 

 

 

1K1

ZC

 

 

 

 

 

 

LINE VOLTAGE

 

 

 

 

 

 

 

W

R

B

 

 

CIRCULATOR

 

 

 

 

 

 

LOW LIMIT

 

 

C1

 

 

 

 

 

 

C2

 

 

 

 

 

 

 

LINE VOLTAGE

 

 

 

B

 

 

OIL BURNER

 

 

 

 

HIGH

 

RELAY OR

 

 

 

 

3

GAS VALVE

 

 

 

 

LIMIT

 

 

 

 

 

 

 

 

 

R

 

B1

 

 

 

 

 

 

B2

 

SETTING

Follow the boiler manufacturer recommendations when making the L8124 settings. The high limit setting must be at least 20°F (11°C) higher than the low limit setting. Set the indicators over the selected temperature marks. The low limit differential is set by turning the differential adjustment knob to the desired amount of differential. The thermostat heat anticipator should be set at 2.0A.

CHECKOUT

Put the system into operation and observe each function through at least one complete cycle. Be sure the control operates as intended.

1POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

2CONTROL CASE MUST BE CONNECTED TO EARTH GROUND. USE GROUNDING SCREW PROVIDED.

3

B1 IS 1/4 IN. TAB TERMINAL.

M8804

 

Fig. 13. L8124M single zone connections and internal schematic.

Automation and Control SolutionsAutomation and Control Solutions

Honeywell

Honeywell Limited-Honeywell Limitée

1985 Douglas Drive North

35 Dynamic Drive

Golden Valley, MN 55422

Scarborough, Ontario

 

M1V 4Z9

95-6571—11 G.R. Rev. 12-01 www.honeywell.com