Honeywell Aquastat L8124C Users Manual 95 6571 L8124A,C,E,L And M Aquastat® Relays
L8124C to the manual 227929c5-73fa-4263-a361-7ce53f01a981
2015-01-23
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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. 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. 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. 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. 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. Table 1. Model Descriptions. Model Number L8124A Burner Control Circuit 120V No. of V8043 Zone Valves Powered Without Additional Transformer Can Be Used For Multizone With Circulatorsa Yes — L8124C L8124L Electrical Ratings Burner Circuit Same as L8124A,C,L circulator rating. 3 L8124E 24V 2 1.25A at 24 Vac; 30 VA (total load) B1-B2, Tv-Z. L8124M 120V — Same as L8124A. a Circulator Circuit 120 Vac: 7.4A (full load), 44.4A (locked rotor). 240 Vac: 3.7A (full load), 22.2A (locked rotor). None. 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 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. When Installing This Product… 1. 2. 3. 4. Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous condition. Check the ratings given in the instructions and on the product to make sure the product is suitable for your application. Installer must be a trained, experienced service technician. After installation is complete, check out product operation as provided in these instructions. 1. 2. 3. NOTE: Do not use the case as a handle to tighten. WARNING 4. 5. Electrical Shock Hazard. Can cause severe injury, death or equipment damage. Disconnect power supply before beginning installation to prevent electrical shock or equipment damage. 6. 7. 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. 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. 3 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. 2 CAUTION: EXCESSIVE HANDLING OR SHARP BENDS CAN DAMAGE THE CAPILLARY. 1 SENSING ELEMENT IS FACTORY FORMED FOR 1.5 IN. INSULATION WELL ASSEMBLIES. 2 FOR 3 IN. INSULATION WELL ASSEMBLIES, PULL OUT SUFFICIENT CAPILLARY TO ASSURE THAT THE CAPSULE BOTTOMS IN THE WELL. 3 STRAIGHTEN CAPILLARY SUFFICIENTLY SO IT DOES NOT INTERFERE WITH INSERTION OF THE CAPSULE INTO THE WELL. M8882 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. 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 95-6571—11 Refill boiler and check for water leakage. Loosen but do not remove the clamp screw on the bottom (L8124A,E) or on top (L8124C,L,M) of case. Insert the element in the well until it bottoms. See Fig. 2. 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 Select models have an adjustable capillary length. See Fig. 1. 1 Turn off all power and drain the boiler. If no tapping is provided, prepare one, properly sized and threaded, at the selected location. Install the immersion well in the boiler tapping and tighten securely. 2 L8124A,C,E,L AND M AQUASTAT® RELAYS CONTROLLER CASE IMMERSION WELL CLAMP BACK OF CONTROLLER CASE BOILER IMMERSION WELL CLAMP 1 IMMERSION WELL SPUD ADAPTER ADAPTER OLD IMMERSION WELL ASSEMBLY IMMERSION WELL CLAMP SCREW SENSING BULB (A) ) (B) 2 (D) HEAT-CONDUCTIVE COMPOUND 1 CAPILLARY TUBE 2 SETSCREW 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 (D SHORT TUBE FITS IN CENTRAL RECESS OF ADAPTER IMMERSION WELL CLAMP SCREW BEND THE CAPILLARY TUBE TO HOLD THE SENSING BULB IN GOOD THERMAL CONTACT WITH THE IMMERSION WELL AT POINTS (A) AND (B). M883 Fig. 2. Position of bulb in immersion well and use of well adapter when required. LOW VOLTAGE THERMOSTAT LOW VOLTAGE THERMOSTAT L8124E L8124A,C 2 2 G G T TV T T 1 L1 (HOT) 2 L2 1K Z 1K 1 1 L1 (HOT) 2 L2 1 1K2 R W B LOW LIMIT/ CIRCULATOR W 1K1 ZR B 1K2 R B 1K1 R ZC HIGH LIMIT R LOW LIMIT/ CIRCULATOR 3 HIGH LIMIT LINE VOLTAGE OIL BURNER RELAY OR GAS VALVE C1 LINE VOLTAGE CIRCULATOR B C2 3 B1 TR B1 B2 B2 C1 TH LOW VOLTAGE GAS VALVE (eg, VR8300) C2 LINE VOLTAGE CIRCULATOR 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. 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. M8803 Fig. 4. L8124E single zone connections and internal schematic. M8802 Fig. 3. L8124A,C single zone connections and internal schematic. 3 95-6571—11 L8124A,C,E,L AND M AQUASTAT® RELAYS T87F T87F L8124A T ZR T T L1 C1 C2 B2 B1 1 2 3 2 G L2 T87F R845 RELAY ZC T 3 4 5 6 R845 RELAY T T 1 2 3 4 6 5 L2 L1 (HOT) 1 PUMP PUMP PUMP R8184 F T F C554 WHITE T BLACK BURNER AND IGNITION ORANGE 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. LOW VOLTAGE THERMOSTAT 2 L1 (HOT) L2 1 TO ADDITIONAL R845A RELAYS FOR OTHER ZONES L8124A,C G R845A RELAY ZONE 2 T T 1 ZONE 2 CIRCULATOR 6 2 1K 5 R W B LOW LIMIT/ CIRCULATOR 3 1K1 4 ZR ZC 1 LINE VOLTAGE OIL BURNER RELAY OR GAS VALVE B HIGH LIMIT 1K2 R 3 2 ZONE 2 LOW VOLTAGE THERMOSTAT B1 B2 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. C1 C2 LINE VOLTAGE CIRCULATOR 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 THERMOSTAT 1 L1 (HOT) ZONE 2 THERMOSTAT V8043F V8043F T87F L2 2 TH TR TH TH TR TR G TR TH L2 L1 T T L8124E 3 2 C1 C2 B2 B1 L8124G,L 3 G TV T Z TH L1 (HOT) 1 1K CIRCULATOR L2 1 2 1K1 R W B ZC 1K2 B HIGH LIMIT 4 R 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. ZR LOW LIMIT/ CIRCULATOR LINE VOLTAGE OIL BURNER RELAY OR GAS VALVE TR LOW VOLTAGE GAS VALVE (eg, VR8300) M1796A Fig. 8. L8124E in a 24Vac, gas-fired, forced hot water, tankless system. B1 B2 C2 C1 LINE VOLTAGE CIRCULATOR 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 UP TO TWO V8043F ZONE VALVES CAN BE POWERED WITH L8124G,L. ADD ADDITIONAL TRANSFORMER FOR EVERY TWO OR LESS VALVES. 3 CONTROL 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 R845 RELAY T T 1 2 3 4 5 T87F R845 RELAY 6 T T 1 2 3 4 5 6 R845 RELAY T T 1 2 3 4 5 6 1 L1 (HOT) PUMP L2 PUMP PUMP 2 G L2 L1 T T C1 C2 B2 B1 TH 3 TR LOW VOLTAGE GAS VALVE (eg, VR8300) L8124E AQUASTAT® RELAY 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. M1794A Fig. 9. L8124E in a 24 Vac, gas-fired, forced hot water, tankless, zoned pump system. 1 TO ADDITIONAL R845A RELAYS FOR OTHER ZONES L2 L1 (HOT) R845A RELAY ZONE 1 6 5 L8124E 2 3 G T TV Z 4 1 1K 1 2 2 1K2 W R B ZONE 1 LOW VOLTAGE THERMOSTAT 1K1 LOW LIMIT/ CIRCULATOR R HIGH LIMIT ZONE 1 CIRCULATOR C1 B C2 3 B1 TR B2 THTR TH LOW VOLTAGE GAS VALVE (eg, VR8300) 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. Fig. 10. L8124E multizone system with circulator connections and internal schematic. 95-6571—11 6 M8828 L8124A,C,E,L AND M AQUASTAT® RELAYS LOW VOLTAGE THERMOSTAT ZONE 1 1 L2 L1 (HOT) TO ADDITIONAL R845A RELAYS FOR OTHER ZONES L8124L 2 G TV T Z R845A RELAY ZONE 2 1 1K ZONE 2 CIRCULATOR 6 2 5 1K1 R W B ZR 3 LOW LIMIT/ CIRCULATOR 4 ZC 1K2 B HIGH LIMIT 1 3 R 2 B1 LINE VOLTAGE OIL BURNER RELAY OR GAS VALVE B2 C2 ZONE 2 LOW VOLTAGE THERMOSTAT C1 LINE VOLTAGE CIRCULATOR ZONE 1 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. M8829 Fig. 11. L8124L multizone system with circulator connections and internal schematic. OPERATION 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). 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. HIGH LIMIT SETTING WARNING SWITCH BREAKS ON TEMPERATURE RISE. BURNER TURNS OFF. CIRCULATOR OPERATES ON A CALL FOR HEAT. SWITCH MAKES ON TEMPERATURE FALL. BURNER OPERATES ON A CALL FOR HEAT. 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 SETTING 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. SWITCH MAKES R-W AND BREAKS R-B ON TEMPERATURE RISE. 1 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. 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). 1 WHEN 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 G T 1K1 R CHECKOUT L1 L1 (HOT) L2 L2 1K W 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. 2 L8124M T SETTING 1 Put the system into operation and observe each function through at least one complete cycle. Be sure the control operates as intended. ZC LINE VOLTAGE CIRCULATOR B C1 LOW LIMIT C2 B HIGH LIMIT R 3 LINE VOLTAGE OIL BURNER RELAY OR GAS VALVE B1 B2 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. M8804 Fig. 13. L8124M single zone connections and internal schematic. Automation and Control SolutionsAutomation and Control Solutions Honeywell 1985 Douglas Drive North Golden Valley, MN 55422 95-6571—11 G.R. Rev. 12-01 Honeywell Limited-Honeywell Limitée 35 Dynamic Drive Scarborough, Ontario M1V 4Z9 www.honeywell.com
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