Table of Contents
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APPLICATION
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.
Can Be Used For
Burner
Model
Control
Number
Circuit
L8124A
120V
Yes
L8124C
L8124L
L8124E
24V
L8124M
120V
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
Table 1. Model Descriptions.
No. of V8043 Zone
Valves Powered
Multizone With
Without Additional
a
Circulators
—
3
2
—
L8124A,C,E,L and M
Aquastat® Relays
SPECIFICATIONS
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.
Transformer
Same as L8124A,C,L
circulator rating.
1.25A at 24 Vac; 30 VA
(total load) B
Same as L8124A.
INSTALLATION INSTRUCTIONS
Electrical Ratings
Burner Circuit
120 Vac: 7.4A (full load),
44.4A (locked rotor).
240 Vac: 3.7A (full load),
22.2A (locked rotor).
-B
, T
-Z.
1
2
v
None.
Circulator Circuit
95-6571-11
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Table of Contents
Related Manuals for Honeywell AQUASTAT L8124A
Summary of Contents for Honeywell AQUASTAT L8124A
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Page 1: Specifications
1.25A at 24 Vac; 30 VA (total load) B L8124M 120V — Same as L8124A. 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... -
Page 2: Installation
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 When Installing This Product…... -
Page 3: Position Of Bulb In Immersion Well
L8124A,C,E,L AND M AQUASTAT® RELAYS BACK OF IMMERSION CONTROLLER WELL CLAMP CONTROLLER CASE BOILER CASE IMMERSION WELL CLAMP IMMERSION ADAPTER WELL SPUD IMMERSION ADAPTER OLD IMMERSION WELL CLAMP SENSING SCREW WELL ASSEMBLY BULB HEAT-CONDUCTIVE COMPOUND BEND THE CAPILLARY TUBE TO HOLD THE SENSING BULB IN GOOD CAPILLARY THERMAL CONTACT WITH THE IMMERSION WELL AT POINTS (A) AND (B). -
Page 4: L8124A,C Multizone System
L8124A,C,E,L AND M AQUASTAT® RELAYS T87F T87F T87F L8124A R845 RELAY R845 RELAY L1 C1 C2 B2 (HOT) PUMP PUMP PUMP R8184 C554 ORANGE BURNER BLACK IGNITION POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. CONTROL CASE MUST BE CONNECTED TO EARTH GROUND. USE GROUNDING SCREW PROVIDED. M8822 B1 IS 1/4 IN. -
Page 5: L8124 Multizone System
L8124A,C,E,L AND M AQUASTAT® RELAYS ZONE 1 ZONE 2 THERMOSTAT THERMOSTAT (HOT) T87F V8043F V8043F L8124E C1 C2 L8124G,L (HOT) CIRCULATOR LOW VOLTAGE GAS VALVE L2 1 (eg, VR8300) POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. CONTROL CASE MUST BE CONNECTED TO EARTH GROUND. LOW LIMIT/ USE GROUNDING SCREW PROVIDED. -
Page 6: L8124E Multizone System
L8124A,C,E,L AND M AQUASTAT® RELAYS T87F T87F T87F R845 RELAY R845 RELAY R845 RELAY (HOT) PUMP PUMP PUMP LOW VOLTAGE GAS VALVE C1 C2 (eg, VR8300) L8124E AQUASTAT ® RELAY POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. CONTROL CASE MUST BE CONNECTED TO EARTH GROUND. -
Page 7: L8124L Multizone System
L8124A,C,E,L AND M AQUASTAT® RELAYS LOW VOLTAGE THERMOSTAT ZONE 1 TO ADDITIONAL R845A RELAYS FOR OTHER ZONES (HOT) L8124L R845A RELAY ZONE 2 ZONE 2 CIRCULATOR LOW LIMIT/ CIRCULATOR HIGH LIMIT LINE VOLTAGE ZONE 2 OIL BURNER LOW VOLTAGE RELAY OR THERMOSTAT GAS VALVE POWER SUPPLY. -
Page 8: L8124M Single Zone Connections
B1 IS 1/4 IN. TAB TERMINAL. 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...