L7148F ELECTRONIC AQUASTAT
®
CONTROLLER
3
68-0189—2
Immersion Well:
Available separately. Contact your
distributor or Honeywell sales representative to order, or
refer to Accessories for Immersion Wells, Compression
Fittings, and Element Holders, form 68-0040.
Transformer:
Available separately with either quick connect
terminals or AMP plug connections. Contact your
distributor or Honeywell sales representative to order.
Table 1. Sensor Specifications.
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
Fire or Explosion Hazard.
Can cause property damage, severe injury or
death.
Use this product only in systems with a pressure
relief valve.
WARNING
Electrical Shock Hazard.
Can cause electrical shock or equipment damage.
Disconnect power supply before beginning wiring.
Never apply a jumper across (or short) terminals
B1 and B2. This will burn out the transformer.
Mounting
WARNING
Fire or Explosion Hazard.
Can cause serious injury, death or property
damage.
Sensor must be fully inserted to bottom of well.
IMPORTANT
The L7148F is not designed for spud mounting to the
sensing well.
Sensor and immersion well are not provided and must be
purchased separately. Mounting screws must be obtained
locally. See Table 1 for sensor specifications. The sensor
is adaptable to existing immersion wells with a shell I.D. of
3/8 in. (10 mm). To order an immersion well, contact your
distributor or Honeywell sales representative, or refer to
Accessories for Immersion Wells, Compression Fittings,
and Element Holders, form 68-0040.
In new and replacement applications, mount the Electronic
Aquastat Controller on the vestibule away from heated
surfaces. Use four no. 6 screws, obtained locally, to mount
the control through the four mounting holes.
Mount the immersion well, purchased separately, where boiler
water of average temperature can circulate freely around it.
To insert the immersion well into the boiler:
1.
Turn off all power and drain the boiler.
2.
If no tapping is provided, prepare properly sized and
threaded tapping near the top of the boiler.
3.
Coat the well threads sparingly with pipe dope, install
the well in the boiler tapping, and tighten securely.
4.
Refill the boiler and check for water leakage.
Sensor
Termination
Lead Length
Diameter Capsule Length
Mounting
Material
32004955-001 One 1/4 in. (6 mm) and one 3/16 in.
(5 mm) quick connect terminal.
12 in. (304 mm),
18 gauge wire.
3/8 in.
(10 mm)
1-1/4 in.
(32 mm)
Compression Thermal
plastic
32004955-002
18 in. (458 mm),
18 gauge wire
32004955-003
25 in. (610 mm),
18 gauge wire.
32004955-004
36 in. (914 mm),
18 gauge wire
32004955-005
48 in. (1219
mm), 18 gauge
wire.
