APPLICATION
The L8148A,E,J Aquastat® Relays are immersion-type
controllers for use with forced hydronic heating systems.
The combination high limit and intermediate switching
relay works with a low voltage (24V) thermostat to control
burner and circulator circuits. A call for heat by the
thermostat starts both the burner and the circulator.
When boiler-water temperature exceeds the high-limit
settings, the burner circuit is broken; the circulator
continues to operate during the thermostat call for heat.
The L8148A controls line-voltage burner circuits; the
L8148E,J control low-voltage burner circuits; the L8148J
controls millivoltage burner circuits. All models control
line-voltage circulator circuits.
L8148A,E,J have provisions for adding low-limit
controllers; L8148E,J can power valves in multizone
systems.
L8148E is available with a plug and 50 VA transformer for
use with Honeywell Smart Valve SV9500/SV9600.
SPECIFICATIONS
Electrical Ratings:
Table 1. Circulator Control Circuit (A):
Type
Full Load
7.4
Locked Rotor
44.4
Table 2. Burner Control Circuit:
Model No.
Voltage
L8148A
Line
L8148E,J
Low
® U.S. Registered Trademark
Copyright © 2002 Honeywell •
120 Vac
240 Vac
3.7
22.7
Electrical Rating
Same as circulator control
circuit.
0.8A maximum at 24 Vac.
•All Rights Reserved
Aquastat® Relays
INSTALLATION INSTRUCTIONS
Scale Range: 140°F to 240°F (60°C to 116°C) or 180°F
to 240°F (82°C to 116°C).
Differential: Nonadjustable.
High Limit Dial Stop: Adjustable.
Maximum Pressure on Immersion Well: 255 psi (1758
kPa).
Maximum Ambient Temperature: 150°F (66°C) with
1.2A, 24V load; 77°F (25°C) with 1.4A, 24V load.
Maximum Bulb Temperature: 40°F over setpoint, up to
265°F (4°C over setpoint, up to 129°C).
Thermostat Heat Anticipator Setting: 0.2A.
Material Safety Data Sheets (MSDS): For information
on heat-conductive compound, see form number
69-0955.
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
Explosion Hazard.
Can cause severe injury, death or property
damage.
This product is intended for use only in systems
with a pressure relief valve.
L8148A,E,J
95- 6940- 12
Table of Contents
Related Manuals for Honeywell Aquastat L8148A
Summary of Contents for Honeywell Aquastat L8148A
-
Page 1: Specifications
69-0955. L8148E is available with a plug and 50 VA transformer for INSTALLATION use with Honeywell Smart Valve SV9500/SV9600. SPECIFICATIONS When Installing This Product… 1. Read these instructions carefully. Failure to follow Electrical Ratings: them could damage the product or cause a hazardous condition. -
Page 2: Mounting Installation
L8148A,E,J AQUASTAT® RELAYS NOTE: Some models have an adjustable tubing length WARNING to 3 in. (76 mm). For these models, pull out extra tubing from inside the case, if needed. Electrical Shock Hazard. Can cause severe injury, death or property 7. -
Page 3: Wiring
L8148A,E,J 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 WELL ASSEMBLY SCREW 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: External/Internal Connections Schematic
L8148A,E,J AQUASTAT® RELAYS THERMOSTAT L8148A HIGH LIMIT L6006 LOW LIMIT CONTROLLER TO LINE VOLTAGE OIL BURNER RELAY OR GAS VALVE CIRCULATOR JUMPER POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOADPROTECTION AS REQUIRED. REMOVE JUMPER WHEN ADDING L6006 LOW LIMIT CONTROLLER. CONTROL CASE MUST BE CONNECTED TO EARTH GROUND. -
Page 5: Wiring Diagrams
L8148A,E,J AQUASTAT® RELAYS T87F T87F T87F R845 R845 R845 RELAY PUMP PUMP PUMP (HOT) L8148A ORANGE WHITE C554 BLACK BURNER IGNITION R8184G POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. CONTROL CASE MUST BE CONNECTED TO EARTH GROUND. USE GROUNDING SCREW PROVIDED. M2843A B1 IS 1/4 IN. -
Page 6: Operation And Setting
L8148A,E,J AQUASTAT® RELAYS ZONE 2 ZONE 1 ZONE 3 24 VOLT 24 VOLT 24 VOLT V8043F THERMOSTAT THERMOSTAT THERMOSTAT END SWITCH V8043F V8043F END SWITCH END SWITCH L8148J MILLIVOLTAGE POWERPILE ® GAS VALVE LOW VOLTAGE GAS VALVE (eg, VR8300) THTR CIRCULATOR POWER SUPPLY. - Page 7 L8148A,E,J AQUASTAT® RELAYS CAUTION INSERT CORNER OF SMALL SCREWDRIVER IN THIS Equipment Damage Hazard. NOTCH AND PRY STOP Improper procedure will damage equipment. UPWARD FROM DIAL FACE POINTER Never apply a jumper across (or short) terminals HIGH LIMIT B1, B2, or B3. This burns out the transformer. WHILE HOLDING STOP AWAY STOP FROM DIAL FACE WITH...
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