95-5971—2
2
L4008A,B,E,L; L6008A,G,H REMOTE BULB AQUASTAT
®
CONTROLLERS
The Aquastat® controller can be remotely mounted—
either vertically on a wall or panel, or directly on the boiler,
tank, or vessel.
If the system is filled, drain the system to a point below the
boiler tapping, or to wherever the sensing bulb is to be
installed.
Mounting the Ca
s
e
Remove the cover and fasten the case to the wall or
panel using the three mounting holes in the back of
the case.
When mounting the remote bulb, if desirable, route
the tubing to run through any of the other three
corner notches in the case. Be careful not to kink or
bend tubing sharply. Be sure bends have at least 1 in.
(25.4 mm) radius.
In
s
talling Remote
B
ulb with Immer
s
ion W
ell
Fit well, if used, to sensing bulb snugly for good thermal
response. Insert bulb until it rests against the bottom of the
well; then hold it there while tightening the tubing clamp.
Screw the well into the boiler, tank or pipe tapping.
Insert the bulb into the well, pushing the tubing until
the bulb bottoms in the well.
Attach the retainer clamp to the end of the well spud.
Loosen the draw nut and spread the jaws of the
clamp with the screwdriver if necessary.
With the retainer clamp attached to the well spud (be
sure jaws of clamp hook over ridge at end of the
spud, as shown in Fig. 2, points A). Adjust tubing to fit
through retainer clamp groove, as shown at point B.
Tighten the draw nut so the retainer clamp is firmly
attached to the well spud and the tubing is held by
the clamp.
Mounting with
B
ulb Compre
ss
ion Fitting
Screw the fitting into the boiler or pipe tapping.
Slide sealing washer onto the bulb.
Insert the bulb into the fitting until bulb bottoms.
Slide split sleeve into fitting.
Place clamps A and B on assembly so that sleeve is
drawn into fitting when screws are tightened.
N
O
T
E
:
Make sure that the nub on clamp A
engages space between sleeve and clamp.
Tighten clamp screws evenly.
M8777
WELL
BULB
SPUD
MOUNTING
CLAMP
A
DRAW
NUT
TUBING
B
INSERT— MOUNTING CLAMP
SCREWDRIVER
SPREAD JAWS
TO FIT OVER
RIDGE ON
WELL SPUD
JAWS
Fig. 2. Immersion well fitting.
IMPORTANT
Do not secure draw nut so tightly that retainer
clamp could cut or collapse tubing.
M8815
CLAMP B
CLAMP A
CLAMP SCREWS (2)
BULB
COMPRESSION
FITTING
SEALING
WASHER
BULB
INSERTION LENGTH
APPROX. 3-3/16 IN. (81 MM)
SPLIT SLEEVE
Fig. 3. Bulb compression fitting.
Mounting with Capillary Compre
ss
ion
Fitting
Screw fitting into the boiler or pipe tapping.
Place packing nut on tubing.
Slide bulb completely through fitting.
Place composition disc and 4 slotted brass washers
on tubing in the order shown in Fig. 4. Turn brass
washers so that slots are 180 degrees to each other.
Slide seal assembly into fitting and tighten packing nut.
COMPOSITION DISK
(SLOTTED)
BOILER PLUG
CAPILLARY TUBING
EXAMPLE OF SLOTTED WASHERS
ASSEMBLED
IN PAIRS:
PACKING NUT
M8816
IMMERSION
BULB
Fig. 4. Capillary compression fitting.
WIRING
All wiring must agree with applicable codes and ordinances
and regulations in such matters as wire size, type of
insulation, and enclosure. The controllers are provided
with conduit knockouts in the top and bottom of case.
Refer to Fig. 5 or 6 for a typical connection diagram.
X-XX UL
INST
ALLA
TION INSTRUCTIONS
®U.S. Registered Trademark
Copyright © 1995 Honeywell Inc. • All Rights Reserved
L4008A,
B
,E,L; L
6
008A,G,H
Aqua
s
tat
®
Controller
s
APPLICA
TION
These remote bulb (see Fig. 7), immersion type (see Fig. 1)
controllers operate in response to temperature changes in
hydronic heating systems and other heated liquids.
Electrical Ratings:
Switch ratings are shown on the inside cover of each
device. The electrical requirements on controlled equipment
must not exceed this rating.
L4008A—breaks the burner circuit on a rise in water
temperature. It is normally used as a limit controller.
When used as an operating controller or low limit, a
separate high limit control must be used.
L4008B—makes a control circuit on a rise in water
temperature. It is normally used as a circulator
controller to prevent circulator operation until boiler
water temperature is at or above the control setting.
L4008E—breaks the burner circuit and locks out on a
rise in water temperature. It is used as a high limit
controller where manual reset is desirable.
L4008L—is used as a 2-stage Aquastat® controller.
L6008A—makes the burner circuit on a drop in water
temperature. It is normally used as a circulator and
low limit cooling controller.
L6008G—is used as a 2-stage Aquastat® controller to
cycle 2-stage gas valve.
L6008H—is used as a low fire Aquastat® controller.
If immersion well or capillary compression fitting must be
ordered, refer to form 68-0040, Wells and Fittings for
Temperature Controllers, for part numbers and ordering
information.
INST
ALLA
TION
When In
s
talling thi
s
Product…
1.
Read these instructions carefully. Failure to follow
them could damage the product or cause a hazard-
ous 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 installation to
prevent electrical shock or equipment damage.
Depending on model and installation requirements, install
the temperature sensing bulb either in an immersion well
(see Fig. 2) that extends into the boiler or tank, or directly
immerse the temperature sensing bulb in the liquid. For
inst
al
la
ti
ons not
usi
ng a
well, secure the bulb with a bulb
compression fitting (see
Fig. 3),
or
a
cap
illary
compression
fitting (see Fig. 4). Order the well or the fitting separately.
The boiler manufacturer generally provides a tapping for
inserting the Aquastat® controller sensing element. Locate
this tapping in a representative point where typical water
temperature can be measured. Never locate the bulb or
protecting immersion well close to a hot or cold water inlet
or steam coil. Install the bulb in the supply line of an
indirect water heater, in the indirect water heater itself, or
in the feed riser about 6 in. (152 mm) above the boiler. If
the riser is valved, install the bulb between the boiler and
the valve.
95-5971-2
Fig. 1. Internal view.
M8806
SETPOINT
INDICATING DIAL
DIFFERENTIAL
ADJUSTMENT
WHEEL
ADAPTER CLAMP
SCREWS
INSERTION
ELEMENT
WITH VERTICAL MOUNTING OF IMMERSION WELL,
ELEMENT IS ATTACHED TO BOTTOM OF THE CASE.
SELECT MODELS HAVE SCREW TERMINAL, NOT TAB
TERMINAL.
1
2
2
1
