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L8124A,C,E,L AND M AQUASTAT® RELAYS
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
Electrical Shock Hazard.
Can cause severe injury, death or equipment
damage.
Disconnect power supply before beginning
installation to prevent electrical shock or
equipment damage.
IMPORTANT
1. Terminals on these Aquastat Relays are
approved for copper wire only.
2. Immersion well must fit sensing element and
bulb must rest against bottom of well.
Bend the tubing, if necessary, to hold the bulb against the
bottom of the well. Do not make a sharp bend in the
tubing. A sharp bend can produce a break in the tubing
and cause loss of fill. This condition will cause the high
and low limit controllers to be continuously made.
Select models have an adjustable capillary length.
See Fig. 1.
1
CAUTION:
EXCESSIVE HANDLING OR SHARP BENDS
CAN DAMAGE THE CAPILLARY.
1
SENSING ELEMENT IS FACTORY FORMED FOR 1.5 IN.
INSULATION WELL ASSEMBLIES.
2
FOR 3 IN. INSULATION WELL ASSEMBLIES, PULL OUT
SUFFICIENT CAPILLARY TO ASSURE THAT THE CAPSULE
BOTTOMS IN THE WELL.
3
STRAIGHTEN CAPILLARY SUFFICIENTLY SO IT DOES NOT
INTERFERE WITH INSERTION OF THE CAPSULE INTO THE WELL.
Fig. 1. Adjusting the capillary length.
Mounting
Each relay is suitable for use with an immersion well for
insertion into the boiler. (Check individual OS number
specifications to determine whether a well is supplied
95-6571—11
3
2
M8882
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
(see Fig. 2) can be ordered separately to adapt some
other wells to the mounting clamp. The boiler must be
provided with a tapping that allows horizontal mounting of
the well. It should be located where boiler water of
average temperature can circulate around the well.
1. Turn off all power and drain the boiler.
2. If no tapping is provided, prepare one, properly
sized and threaded, at the selected location.
3. Install the immersion well in the boiler tapping and
tighten securely.
NOTE: Do not use the case as a handle to tighten.
4. Refill boiler and check for water leakage.
5. Loosen but do not remove the clamp screw on
the bottom (L8124A,E) or on top (L8124C,L,M)
of case.
6. Insert the element in the well until it bottoms.
See Fig. 2.
7. Fit the case onto the well so that the clamp on the
case slides over the flange on the well. Securely
tighten clamp screw.
WIRING
WARNING
Electrical Shock Hazard.
Can cause severe injury, death or equipment
damage.
Disconnect power before wiring to prevent
electrical shock or equipment damage.
All wiring must comply with local electrical codes and
ordinances. The limits given in the Specifications section
must not be exceeded when applying this control.
Terminals on these Aquastat Relays are approved for
copper wire only.
Refer to the insert on the inside of the Aquastat Relay
cover or to Table 1 for electrical ratings and maximum
load information. Use manufacturer instructions when
wiring controlled equipment or refer to typical hookups in
Fig. 3 through 11.
WARNING
Explosion Hazard.
Can cause severe injury, death or property
damage.
Use this product only in systems with a pressure
relief valve.
If the B1 terminal on the device being replaced is a 1/4 in.
(6 mm) 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 on the 1/4 in. (6 mm) tab terminal of the
replacement device. After the adapter is installed, the
existing wraparound wire end may be reused to make an
electrical connection to the B1 terminal.
2
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