Honeywell TRIPLEAQUASTAT L8151A user manual

Summary of the content on the page No. 1

L8151A
®
Triple Aquastat Relay
The L8151A is a remote bulb controller for use
with hydronic heating systems that include domes-
tic hot water service.
■ Provides high limit, low limit, and circulator control ■ Shielded capillary allows convenient mounting.
for maintaining boiler temperatures.
■ Consists of a diaphragm powerhead and micro switch
■ Can provide multizone control by using a separate assembly that responds to temperature changes in
thermostat and R845 Relay for each zone. the boiler

Summary of the content on the page No. 2

L8151A SPECIFICATIONS • INSTALLATION • ORDERING INFORMATION Specification IMPORTANT: The specifications given in this publication MAXIMUM AMBIENT TEMPERATURE: 150°F (66°C) do not include normal manufacturing tolerances. at case. 265°F (130°C) at sensing element. Therefore, this unit may not exactly match the listed PRESSURE RATING: 200 psi (1380 kPa) on outside of specifications. Also, this product is tested and cali- immersion well. brated under closely controlled conditions, and some THERMOS

Summary of the content on the page No. 3

L8151A INSTALLATION IMMERSION WELL MOUNTING CAUTION NOTE: Immersion well must be ordered separately. For a list • Disconnect power supply before beginning in- of available wells, refer to form 68-0040, Wells and stallation to prevent electrical shock or equip- Fittings for Temperature Controllers. ment damage. • Avoid making sharp bends or kinks in the capil- The boiler manufacturer generally provides a tapping lary. Bends should be no less than 1 in. (25 mm). for the immersion well. This tappin

Summary of the content on the page No. 4

L8151A INSTALLATION All wiring must comply with local electrical codes and Fig. 3—Remote bulb installation. ordinances. The limits given in the Specifications section must not be exceeded when applying this control. Use manufacturer instructions when wiring controlled equip- ment or refer to typical hookups in Fig. 4 through 6. When the B1 terminal on the device being replaced is 1/4 in. tab terminal, use the existing wiring harness termi- JAWS nals to install the replacement device. When the B1

Summary of the content on the page No. 5

L8151A OPERATION AND SETTINGS Operation and Settings HIGH LIMIT The high limit opens and turns off the burner when the Fig. 6—L8151A internal schematic. water temperature reaches the setpoint. The high limit automatically resets after the water temperature drops past 21 the setpoint and through the 10°F (6°C) differential. WARNING T CAN CAUSE PROPERTY DAMAGE, 1K SEVERE INJURY OR DEATH. T Product is for use only in a system with a pressure HIGH LIMIT 1K2 relief valve. B2 B1 R ZR LOW LOW LIMIT AND

Summary of the content on the page No. 6

L8151A OPERATION AND SETTINGS • CHECKOUT EXAMPLE: Setpoint of 140°F (60°C) differential set at THERMOSTAT ANTICIPATOR 25°F (14°C). On a temperature rise, R-B breaks and Set the thermostat heat anticipator at 0.2A. R-W makes at 155°F (68°C). On a temperature fall, R-B makes and R-W breaks at 130°F (54°C); see Fig. 7. Checkout Put the system into operation and observe each function through at least one complete cycle. Be sure the control operates as intended. Automation and Control Solutions Honey