Honeywell Aquastat L8148A Instruction Manual

Honeywell Accessories Instruction Manual - Aquastat L8148A.
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Aquastat L8148A
® U.S. Registered Trademark
Copyright © 2002 Honeywell • •All Rights Reserved
95- 6940- 12
Aquastat® Relays
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
L8148E is available with a plug and 50 VA transformer for
use with Honeywell Smart Valve SV9500/SV9600.
Electrical Ratings:
Table 1. Circulator Control Circuit (A):
Table 2. Burner Control Circuit:
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
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
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
4. After installation is complete, check out product
operation as provided in these instructions.
Explosion Hazard.
Can cause severe injury, death or property
This product is intended for use only in systems
with a pressure relief valve.
Type 120 Vac 240 Vac
Full Load 7.4 3.7
Locked Rotor 44.4 22.7
Model No. Voltage Electrical Rating
L8148A Line Same as circulator control
L8148E,J Low 0.8A maximum at 24 Vac.

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