Honeywell Aquastat L8148A Instruction Manual | Page 3

Honeywell Accessories Instruction Manual - Aquastat L8148A.
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L8148A,E,J AQUASTAT® RELAYS

3

95-6940—12

Fig. 2. Proper position of sensing bulb in immersion well, and use of well adapter in existing well.

WIRING

IMPORTANT

The terminals of these Aquastat® Relays are 
approved for use with copper wire only.

WARNING

Electrical Shock Hazard.

Can cause severe injury, death or property 
damage.

Disconnect power supply before making wiring 
connections to prevent electrical shock or 

equipment damage.

 Al  wiring must comply with local electrical codes and 
ordinances. Do not exceed the specifications in the 

Application section when applying this control.

L8148J can power up to two V8043 Zone Valves. 
Additional valves, in groups of two or less, require an 

additional transformer. Fol ow the appropriate wiring 
diagrams when using zone valves or a low limit 

control er. See Fig. 3 through 7.

If the B1 terminal on the device being replaced is a 1/4 in. 

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 onto the 

1/4 in. tab terminal of the replacement device. After the 
adapter is installed, reuse the existing wraparound wire 

end to make an electrical connection to the B1 terminal. 

CAUTION

Equipment Damage Hazard.

Can cause incorrect operation.

1.If L8148E,J are used to power zone valves, 

low voltage (24 Vac) load must not exceed 
1.4A; a 1.2A load is the maximum permissible 

when ambient temperature exceeds 77°F 
(25°C).  Use additional transformer(s) when 

load exceeds these ratings.
2.When L8148E is used to power SV9500/

SV9600, use separate transformer to power 
zone valves.

CONTROLLER
CASE

IMMERSION
WELL CLAMP

ADAPTER

IMMERSION
WELL SPUD

BOILER

OLD IMMERSION
WELL ASSEMBLY

BACK OF

CONTROLLER

CASE

IMMERSION
WELL CLAMP
SCREW

ADAPTER

SENSING 
BULB

HEAT-CONDUCTIVE COMPOUND

SETSCREW

CAPILLARY
TUBE

(C)

IMMERSION
WELL CLAMP

IMMERSION
WELL CLAMP SCREW

SHORT TUBE 
FITS IN CENTRAL
RECESS OF ADAPTER

BEND THE CAPILLARY TUBE TO HOLD THE SENSING BULB IN GOOD 
THERMAL CONTACT WITH THE IMMERSION WELL AT POINTS  (A) AND (B).

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).

M8830

1

1

2

2

(D)

(B)

(A)

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