Honeywell Electronic Aquastat L7148F Manual page 4

L7148F ELECTRONIC AQUASTAT
IMPORTANT
• Sensor must be fully inserted to bottom of well.
• Remove all heat conductive compound from the well
prior to sensor insertion.
5. Insert the sensor into the well. Make sure the sensor fits
securely against the bottom of the well.
To secure sensor and leadwire with mounting clamp
(see Fig. 2.):
1. Loosen the draw nut and spread the jaws of the clamp.
2. Slide the jaws of the clamp over the mounting flange.
3. Adjust the sensor leadwire to fit through the groove in
the mounting clamp.
IMPORTANT
Do not overtighten the draw nut or a system
shut-down could occur.
4. Tighten the draw nut so that the clamp is firmly attached
to the well and the leadwire is held securely in place.
5. Secure excess leadwire to prevent disconnection of
sensor or removal from the well.
MOUNTING
FLANGE
JAWS OF
CLAMP
CLAMP
TIGHTEN SCREW AND DRAW NUT
TO SECURE CLAMP
Fig. 2. Secure sensor and leadwire with mounting
clamp or spring (see Accessories).
68-0189—2
®
CONTROLLER
BOTTOM OF WELL
SENSOR
SENSOR
LEADWIRE
PLACE
JAWS OF
CLAMP OVER
MOUNTING FLANGE
M11483
4
Wiring
WARNING
Electrical shock hazard.
Can cause serious injury, death or equipment
damage.
Disconnect power supply before beginning wiring.
IMPORTANT
• An external transformer is required for operation.
The user must size the transformer for the specific
application.
• If L7148F is used to power zone valves, total low
voltage (24V) load must not exceed 4A. Use a
zoning panel such as the Honeywell R8889 when
load exceeds these ratings.
All wiring must comply with local electrical codes and
ordinances. Refer to the SPECIFICATIONS section when
applying this control. For appropriate wiring diagrams, see
Fig. 3 through 10.
For screw terminal connections:
1. Strip 1/16 in. of insulation from the
wire end.
2. Insert the wire under the terminal
screw and contact plate.
3. Using a standard, flat-headed
screwdriver, tighten the screw until
the wire is firmly in contact with the
screw and contact plate.
4. Tighten the screw an additional
one-half turn.
For quick connect terminal connections:
Connect the quick connect to the appropriate terminal on
the control. B1 and S1 are 3/16 in. (5 mm) quick connect
terminals; all other terminals are 1/4 in. (6 mm).
For AMP plug connections:
Connect the AMP plugs to the receptacles on the control.
An AMP plug connection is shown in Fig. 8.
The L7148F and appropriately sized external transformer can
power up to three Honeywell V8043 Zone Valves. Additional
valves, in groups of three or less, require an additional
transformer, or use Honeywell R8889 Zone Valve Panel.
Follow the appropriate wiring diagrams when using zone
valves. See Fig. 4, 5, 7, and 9.
On systems requiring a vent damper, the Honeywell vent
damper can be connected directly to some L7148F Electronic
Aquastat models (Fig. 9) or S8610 Spark Ignition Modules
(Fig.8). With the vent damper plugged into the Electronic
Aquastat Controller, a fuse in the Electronic Aquastat
Controller blows when the thermostat first closes. Once
the fuse is blown, the Electronic Aquastat Controller does
not operate unless the vent damper is connected. With the
vent damper plugged into the S8610, a fuse in the ignition
module blows when first powered. Once the fuse is blown,
the ignition module does not operate unless the vent damper
is connected.
M11484