INSTALLATION INSTRUCTIONS
95-6120B-05
L4006,L4007 Aquastat Controllers
APPLICATION
These boiler-mounted, immersion type controllers
operate in response to temperature changes in hydronic
heating systems.
L4006A,C; L4007 A break the circuit on a temperature
rise to the control setting. They are used tor high limit or
low limit control. When used as a controller or as a low
limit, a separate high limit must be used.
L4006B, L4007Bmake the circuit on a temperature rise.
They are used as a circulator controller, delaying
circulator operation if boiler water temperature is below
the control setting.
L4006E (horizontal well with vertical option) models
include trip-tree manual reset switch. Whenever the
temperature of the controlled medium reaches the high
limit setting, these models are designed to break the
control circuit. A reset button at the front of the case
must be pressed to re-establish the control circuit.
L4006G includes two switches which break
simultaneously on temperature rise to the control
setting. This model is used tor high limit and circulator
control.
Depending on the model, the Aquastat controllers may
include:
• bulb compression titting (L4006C only),
• immersion well tor mounting vertically, or
• immersion well for mounting horizontally.
INSTALLATION
When Installing this Product...
1.
Read these instructions carefully. Failure to follow
them could damage the product or cause a haz-
ardous 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.
CAUTION
Disconnect power supply before beginning
installation to prevent electrical shock or
equipment damage.
Mounting
The boiler manufacturer generally provides a tapping for
insertion of the Aqua stat controller's sensing element.
This tapping is located in a representative point where
typical boiler water temperature can be measured.
Depending on model, the element is either inserted in an
immersion well or through a bulb compression fitting.
It immersion well or bulb compression fitting must be
ordered, refer to form 68-0040 “Wells and Fittings for
Temperature Controllers,” for part numbers and ordering
information.
For Models Using an Immersion
Well
The well of the Aquastat controller must always be
exposed to average temperature circulating water, and
must never be located close to a hot or cold inlet or
steam coil. Where the tapping is on the side of the boiler,
use an Aquastat controller in which the well can be
mounted horizontally. Where the tapping is on top ot the
boiler, use a model in which the well can be mounted
vertically. Some models include an adapter for vertical
or horizontal mounting. See Fig. 2.
IMPORTANT
Controller may be used with or without immer-
sion well. Well, if used, must fit sensing bulb
snugly tor good thermal response. Bulb should
be inserted until it rests against bottom of well.
then hold it there while tightening the tubing
clamp.
NOTE:
Some models have an adjustable tubing length
to 3 in. [716 mm]. In these models, extra tubing
inside the case may be pulled out, if needed.
Follow the mounting instructions furnished by the
system manufacturer if available; otherwise. proceed as
follows.
