Honeywell Plumbing Product 104484A User Manual

Immersion Wells and Compression Fittings  
FOR TEMPERATURE CONTROLLERS  
PRODUCT DATA  
FEATURES  
• Immersion wells and compression fittings are  
available to fit a 1/2-14 or 3/4-14 NPT tapping with  
a range of insulation depths.  
IMMERSION WELL  
121371B  
• Immersion wells and compression fittings are  
available in a variety of lengths and diameters.  
• Immersion wells and compression fittings are  
available in a variety of materials, to suit the  
112632AA  
IMMERSION WELL  
application. Materials include: brass, copper,  
stainless steel, mild steel or Monel.  
• Element holders support the capillary and bulb  
or an averaging element in duct applications.  
107324A  
ELEMENT  
HOLDER  
• Bulb shields protect the sensing bulb from sun  
and weather with the bulb installed outdoors.  
• Accessories, including mounting clips, heat-  
conductive compound, waste nuts, a pipe strap  
and a well adapter, are available for mounting  
sensing bulbs in various applications.  
104484A  
COMPRESSION FITTING  
• Immersion wells allow heat transfer while  
protecting the sensing bulb from contact with the  
controlled medium.  
APPLICATION  
• Immersion wells permit removal of the sensing  
bulb for testing or replacement without draining  
the system.  
Immersion wells, compression fittings and element holders  
are used with Aquastat® Temperature Controllers to hold the  
temperature sensing bulb in the controlled medium.  
Immersion wells and compression fittings also prevent  
leakage of the controlled medium.  
• Compression fittings seal the boiler and allow  
bulb insertion directly into the controlled  
medium.  
Contents  
Ordering Information ........................................................  
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IMMERSION WELLS AND COMPRESSION FITTINGS  
121371A-S  
WELL SPUD. FITS 1/2 OR  
3/4-14 NPT TAPPED HOLE  
1/8-1/2 in. OF THREADS MAY  
EXTEND INTO CONTROLLED MEDIUM  
123869A-123872A  
(LESS MOUNTING CLAMP)  
MOUNTING  
CLAMP  
WELL SHELL.  
MOUNTING  
FLANGE  
INSERTION/MAX  
BULB LENGTH  
INSULATION  
DEPTH  
NOTE: 123870F HAS DUAL  
DIAMETER WELL SHELL.  
122555A,B  
FITS 1/2 OR 3/4-14 NPT TAPPED HOLE  
MOUNTING  
FLANGE  
INSERTION/MAX  
BULB LENGTH  
INSULATION DEPTH  
122555E  
DUAL DIAMETER WELL  
FITS 1/2 OR 3/4-14 NPT TAPPED HOLE  
MOUNTING  
FLANGE  
INSERTION/MAX  
BULB LENGTH  
INSULATION DEPTH  
123732AA  
FITS 1/2 OR 3/4-14 NPT  
TAPPED HOLE  
SET SCREW  
INSERTION/MAX  
BULB LENGTH  
INSULATION  
DEPTH  
138134B  
FITS 1/2 OR 3/4-14 NPT TAPPED HOLE  
MOUNTING  
FLANGE  
INSERTION/MAX BULB LENGTH  
FITS 1/2 OR 3/4-14 NPT  
INSULATION DEPTH  
138134E  
DUAL DIAMETER WELL  
TAPPED HOLE  
MOUNTING  
FLANGE  
INSERTION/MAX  
BULB LENGTH  
INSULATION DEPTH  
FITS 1/2 OR  
3/4-14 NPT  
TAPPED HOLE  
112620AA-112639AE  
1/8-1/2 in. OF THREADS MAY  
EXTEND INTO CONTROLLED MEDIUM  
WELL SHELL  
SPRING  
CLIP  
INSULATION  
DEPTH  
INSERTION/MAX  
BULB LENGTH  
M17259A  
Fig. 2. Immersion well dimensions and components.  
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IMMERSION WELLS AND COMPRESSION FITTINGS  
Table 1. Copper Immersion Wells.  
Insulation Capillary  
Spud in  
in. x 14  
NPT  
Shell ID/  
Bulb  
Diameter  
Insertion/  
Max Bulb  
Length  
Part  
Number  
Depth  
Diameter  
Includes  
121371 Mounting Clamp  
1/2  
3/8  
3
1-1/2  
5/64  
121371A  
123869A  
Spud setscrew for armored capillary, plug 123732AA  
3
5/64  
121371 Mounting Clamp  
121371 Mounting Clamp  
112721 Spring Clip  
Plastic sleeve on well tube  
112721 Spring Clip  
112721 Spring Clip  
121371 Mounting Clamp  
121371L  
121371P  
112620AA  
123869B  
112622AA  
112626AA  
121371B  
123870A  
121371M  
123171N  
123871A  
123871B  
122555D  
122555A  
121371Q  
138134B  
122555B  
122555C  
138134E  
122555E  
112630AA  
112634AA  
112630AB  
3-1/2  
3-3/4  
1-1/2  
1-1/2  
1/8  
1/2  
3/8  
4-1/4  
4-1/4  
3
1-1/2  
4-1/2  
1-1/2  
1/8  
3/4  
5/64  
3
5/64  
121371 Mounting Clamp  
121371 Mounting Clamp, plastic sleeve  
Plastic sleeve on well tube  
4-1/2  
Plastic sleeve on well tube  
121371 Mounting Clamp  
3-1/2  
1-1/2  
2-1/4  
4-1/2  
5/64  
Plastic sleeve on well tube  
3/8 + 5/8  
1/2  
3
2-1/4  
4-1/2  
1-1/2  
4
Plastic sleeve on well tube  
4-1/4  
8-1/4  
1/8  
112721 Spring Clip  
1-1/2  
Table 2. Stainless Steel, Mild Steel, and Monel Immersion Wells.  
Insertion/  
Spud in  
in. x 14  
NPT  
Shell ID/  
Bulb  
Diameter  
Insulation Capillary  
Max Bulb  
Length  
Depth  
Diameter  
Material  
Stainless  
Includes  
Part Number  
1/2  
3/8  
1/2  
3
1-1/2  
5/64  
121371 Mounting Clamp 121371E  
steel  
4-1/4  
1
1/8  
Mild steel  
112721 Spring Clip  
112721 Spring Clip  
112623AA  
112624AA  
Stainless  
steel  
4
1
1/8  
1/8  
Stainless  
steel  
112721 Spring Clip  
112721 Spring Clip  
112628AA  
112632AA  
Stainless  
steel  
68-0040—04  
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IMMERSION WELLS AND COMPRESSION FITTINGS  
Table 3. Capillary Compression Fittings.  
Material  
Brass  
Spud  
Maximum Bulb Diameter  
Insulation Depth  
Capillary Diameter  
5/64 in.  
Part Number  
104484A  
7617M  
1/2-14 NPT  
1/2 in.  
1-5/16 in.  
1/8 in.  
1-1/2 in.  
2 in.  
5/64 in.  
104484C  
7617ABY  
104484B  
7617P  
5/64 in.  
3/4-14 NPT  
1-5/8 in.  
1-1/2 in.  
5/64 in.  
11/16 in.  
1/8 in.  
Table 4. Element Holders for Duct-Mount Applications .  
Description  
Application  
Length  
Plate Size  
Part Number  
Bulb holders  
8-5/8 in. 2-3/4 in.  
x 1-3/4 in.  
Supports capillary and bulb in duct;  
mounting screws not included.  
M17275A  
107324A  
131524A  
2-3/4 in x 3 in.  
M17276A  
14 in.  
3-1/4 in x  
3-1/4 in.  
Holds 1 or 2 elements in 0°F to  
100°F air; grommet holds one  
5/64 in. and one 1/8 in. diameter  
capillary; helps reduce airflow through  
opening in duct.  
M17277A  
311266D  
Averaging  
element holders  
Mounting clip; use with grommet;  
mounting screws not included; one  
required per clip.  
M17271  
314439  
Use with 1/2 in. EMT thinwall conduit  
where duct access is limited. Kit  
includes 4 in. (101 mm) cover plate,  
1/2 in. EMT compression fitting, 3/16  
in. (5 mm) rubber grommet, clamp  
assembly, wire ties and mounting  
screws.  
M17279  
7640HX  
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IMMERSION WELLS AND COMPRESSION FITTINGS  
Table 5. Immersion Well Accessories .  
Size in in.  
(except where noted)  
Description  
Mounting clamp  
Application  
Part Number  
Holds capillary in place on  
123869A-123872A;  
122554A,B; 12255A,B,D,E;  
and 138134B-F Immersion  
Wells.  
1/2 or 3/4 in. well spud; 5/64  
capillary  
M17274  
121371AA  
Spring clip  
M17288  
32002656-001  
Holds capillary in place on  
1122620AA-112639AB  
Immersion Wells.  
1/2 in well spud; 5/64 capillary  
104488  
112721  
112720  
1/2 in. well spud; 1/8 capillary.  
3/4 in. well spud; 1/8 capillary.  
M17280  
Heat-conductive compound  
Improves heat conduction in  
well applications where bulb  
does not fit tightly.  
4 oz. (118 ml)  
M17281  
107408  
Single application tube (1/2 oz)  
M17282  
120650  
124904  
Well Adapter  
Adapts well with setscrew on  
spud; for use with direct  
insertion bulb or 121371AA  
Mounting Clamp.  
M17283  
68-0040—04  
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IMMERSION WELLS AND COMPRESSION FITTINGS  
Table 6. Accessories for Duct-Mount Applications  
Application Size  
Description  
Part Number  
Bulb shield assembly  
Shields bulb from weather; 6 in. (152 mm) long; holds 3/8  
less mounting screws and in. and 1/2 bulbs.  
split plug.  
M17284  
107323A  
Shields bulb from weather; 7 in. (118 mm) long, clip holds  
includes mounting screws 3/8 in. bulb.  
and 33578 Split Plug.  
M17285  
34886A  
Pipe Strap  
Fastens bulb to outside of 4-1/2 in. (114 mm) long; used  
pipe.  
with up to 3/4 in. OD pipe.  
M17286  
105900  
maximum temperature and pressure ratings or greater  
corrosion resistance. Some copper wells are available with a  
plastic sleeve over the tube to reduce electrolytic and corrosive  
activity.  
GENERAL INFORMATION  
Immersion Wells  
An immersion well consists of a metal tube, called the well  
shell, closed on one end. A well spud externally threaded to fit  
standard boiler tappings is welded or brazed on the open end.  
See Fig. 1. The well is inserted into the tank and the  
Well Sizing  
Major factors in selecting well size are:  
size of the boiler tapping.  
bulb diameter.  
temperature sensing bulb is inserted into the well. The sensing  
bulb never touches the controlled medium. Because the well  
conducts heat rapidly, the bulb responds quickly and  
accurately to temperature changes in the controlled medium.  
insulation depth.  
insertion length.  
An immersion well protects the temperature sensing bulb from  
mechanical damage or damage due to chemical interaction  
with the controlled medium. Also, a well permits removal of the  
sensing bulb for testing or control replacement without draining  
the system. The threaded fitting of the well spud provides a  
tighter seal than a packing nut applied to the capillary.  
Immersion wells are available to fit standard 1/2-14 NPT and 3/  
4-14 NPT tappings. Sensing bulbs are 3/8, 1/2 or 11/16 in. in  
diameter with well shells designed to fit these diameters. The  
bulb should fit tightly in the shell. If the bulb fits loosely, fill the  
space between the shell and bulb with heat-conductive  
compound to ensure maximum heat transfer. Many Honeywell  
temperature controllers ship with heat-conductive compound;  
available in 4-oz cans and 1/2-oz single-application tubes. See  
Table 4.  
Material Selection  
The immersion well material must conduct heat readily and  
resist corrosive and electrolytic action (especially in brine  
solutions and when the well is a different material than the  
container). The material must also resist fluid contamination  
from chemical reaction with the well and withstand high  
temperatures. Most Honeywell immersion wells are copper  
because of its high conductivity. Stainless steel, mild steel and  
Monel wells are also available for applications requiring higher  
he nominal length of the spud, including the full length of the  
threads and the hex, defines the insulation depth. Depending  
on the characteristics of the tapping, 1/8 to 1/2 in. of the  
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IMMERSION WELLS AND COMPRESSION FITTINGS  
threaded end of the spud can extend into the controlled  
medium. Consider this additional length when determining how  
far the well extends into the controlled medium.  
Capillary compression fittings are used to replace an  
immersion well when the sensing bulb of a remote bulb  
controller requires direct insertion into the controlled medium.  
The fitting seals around the capillary. However, compression  
fittings cannot seal off against as much pressure as immersion  
wells. Capillary compression fittings can be used in duct  
applications to minimize air leakage from the duct; a waste nut  
is recommended to provide a secure mounting.  
The length of the well shell starting at the end of the spud  
defines the insertion length. This is the active part of the well  
where the fastest heat transfer occurs. The bulb should be the  
same length as the well shell; however, the well shell can be  
longer, but not shorter, than the length of the bulb. Longer  
shells require inserting the bulb until the end touches the well  
bottom. Shorter shells do not expose the full length of the bulb  
to the temperature of the controlled medium, inhibiting proper  
temperature controller operation.  
Material Selection  
Capillary compression fittings are available in brass and  
stainless steel. In hydronic applications, brass fittings with  
copper sensing bulbs are used and stainless steel is used with  
all other fittings to minimize electrolytic action.  
Securing Bulb in Well  
Sizing  
REMOTE BULB APPLICATIONS  
Capillary compression fittings must fit the tapping and the  
capillary diameter. Because the spud must slip over the bulb  
during installation, 11/16 in. bulbs require 3/4 in. spuds.  
Securing the capillary at the spud with a spring clip or a  
mounting clamp holds the sensing bulb securely in place. See  
Fig. 1. Use the spring-loaded clip on well spuds with no  
mounting flange. Slip it over the capillary and snap it in place in  
the end of the spud. The mounting requires sizing to fit both the  
spud and the capillary diameter. The mounting clamp requires  
wells with a mounting flange at the spud end. The jaws adjust  
to fit both 1/2 and 3/4 in. spuds, and it holds a 5/64 in. capillary.  
Wells are available with and without the matching spring clip or  
mounting clamp. This mounting hardware is also available  
separately.  
Element Holders  
Bulb holders are used to support a remote bulb and capillary in  
a duct, but are not suitable for hydronic applications. A bulb  
holder must be selected according to the length needed to  
support the bulb in the main airstream and the need for  
plugging the opening in the duct wall.  
For best response, string averaging elements evenly back and  
forth across the duct. The element is held in place with either  
perforated pipe strap or 314439 Mounting Clips. If access to  
the duct is limited, use the 7640HX Duct Mounting Kit. Always  
use a grommet to protect the element from abrasion where it  
enters the duct.  
A few wells have a setscrew in the spud. These wells are  
designed for use on controllers with an armored capillary that  
has a brass plug at the sensing bulb end; for example,  
R8182H,J.  
DIRECT INSERTION APPLICATIONS  
Most Honeywell direct insertion controllers include provision for  
clamping the controller case on the immersion well spud. This  
requires a well spud with a mounting flange at the end. If the  
well spud has a setscrew, but no mounting flange, a 124904  
Well Adapter can provide the necessary flange. See Fig. 3.  
The well adapter is shipped with several Honeywell  
TRADELINE® direct-insertion controllers.  
NOTE: To minimize heat loss through the fitting, use a waste  
nut and compression fitting.  
INSTALLATION  
When Installing this Product…  
1. Read these instructions carefully. Failure to follow them  
could damage the product or cause a hazardous  
condition.  
SETSCREW  
BACK  
OF  
CASE  
BOILER  
WALL  
IMMERSION  
WELL CLAMP  
2. Check the ratings given in the instructions and on the  
product to make sure the product is suitable for your  
application.  
WELL  
SHELL  
WELL  
SPUD  
3. Installer must be a trained, experienced service techni-  
WELL  
cian.  
CLAMP  
SCREW  
WELL  
ADAPTER  
M17261  
4. After installation is complete, check out product opera-  
tion as provided in these instructions.  
SENSING BULB  
Fig. 3. Mounting direct insertion controller  
case on well spud.  
WARNING  
Contact with hot liquid can cause severe injury or  
death.  
Drain system before beginning well or compression  
fitting installation.  
Severe Scalding Hazard.  
Capillary Compression Fittings  
A capillary compression fitting includes a spud, several  
aligning washers, a neoprene packing ring and a packing nut.  
The spud is internally threaded to hold the packing material  
and the packing nut and externally threaded to fit standard  
boiler tappings. The washers and packing ring are sized to fit a  
particular capillary diameter.  
68-0040—04  
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IMMERSION WELLS AND COMPRESSION FITTINGS  
1. Fill the well with compound.  
2. Coat the bulb generously before inserting it into the well.  
3. Move the bulb up and down inside the well to ensure  
even distribution of compound.  
WARNING  
Electrical Shock Hazard or Equipment Damage  
Hazard.  
Can cause sever injury, death or short equipment  
circuitry.  
Securing Bulb with Mounting Clamp  
Disconnect all power supplies before installation.  
Use the 121371 Mounting Clamp only on wells with a mounting  
flange on the spud end.  
Most equipment manufacturers provide a tapping for  
temperature controller sensing element insertion. The tapping  
should be located to measure average system temperature.  
1. Loosen the draw nut and spread the jaws of the clamp  
with a screwdriver. See Fig. 5.  
2. Slide the clamp jaws over the spud mounting flange  
(point A in Fig. 5).  
3. Adjust the tubing to fit through the mounting clamp  
groove (point B in Fig. 5).  
IMPORTANT  
Always install the sensing element away from hot or  
cold water inlets, steam coils, and locations where the  
well pressure rating will be exceeded.  
IMPORTANT  
1. Turn off the power.  
When tightening the draw nut, be careful not to  
damage the capillary.  
2. If the system is filled, drain it to a point below the boiler  
tapping or sensing element location.  
3. If no tapping is provided, prepare one, properly threaded,  
4. Tighten the draw nut so that the retainer clamp attaches  
firmly to the well spud and holds the tubing securely in  
place.  
at the desired location.  
Immersion Well Mounting  
Instructions for mounting the well in the tapping and using the  
capillary mounting clamp or spring clip in remote bulb  
applications follow. Consult the appropriate Aquastat®  
Controller instructions for mounting the controller on the well in  
direct insertion applications. Direct insertion applications  
usually require using wells with a mounting flange on the spud.  
JAWS  
SPREAD JAWS  
TO FIT OVER  
RIDGE ON  
WELL SPUD  
1. Coat threads with a moderate amount of pipe dope, leav-  
ing two end threads bare. See Fig. 4.  
SCREWDRIVER  
MOUNTING CLAMP  
NOTE: Teflon™ tape can also be used.  
DRAW  
NUT  
2. Screw the immersion well into the tapping and tighten  
MOUNTING  
CLAMP  
securely.  
SPUD  
WELL  
BULB  
B
APPLY A MODERATE AMOUNT  
OF PIPE COMPOUND (LEAVE  
TWO END THREADS BARE).  
TUBING  
M8777  
M17262  
A
Fig. 4. Proper application of pipe dope.  
Fig. 5. Fastening bulb in well using mounting clamp.  
Insert Sensing Bulb in Well  
Securing Bulb with Spring Clip  
For good temperature response, the immersion well must fit  
the sensing element or bulb tightly and rest against the bottom  
of the well.  
The spring clip can be used with any well with the appropriately  
size spud. Wells without a mounting flange on the spud require  
a spring clip.  
NOTE: If necessary, bend the tubing to hold the bulb against  
the bottom of the well.  
NOTE: The spring clip does not hold the capillary as securely  
as does the mounting clamp. See Table 5 for spring  
clip part numbers.  
IMPORTANT  
Any bends made in the piping must be gradual to pre-  
vent breaks in the tubing and subsequent loss of fill.  
1. Slide the clip over the capillary with the prongs facing the  
well.  
2. Push the clip as far as possible into the spud. See Fig. 6.  
For faster heat transfer, use heat-conductive compound to fill  
the space between the bulb and the well. A tube of  
heat-conductive compound ships with Honeywell  
TRADELINE® Aquastat Controllers. The compound is also  
available as an accessory. See Table 5. Use the following  
procedure when installing the compound:  
NOTE: Make sure the bulb remains bottomed in the well.  
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IMMERSION WELLS AND COMPRESSION FITTINGS  
Element Holders  
FITTING (INCLUDING WELL)  
APPROX. 3-3/8 IN.  
Use element holders to mount air temperature sensors in a  
duct. Locate the sensing element where air at representative  
temperatures can circulate around it. In a plenum application,  
locate the element far enough from the combustion chamber to  
avoid the effect of direct radiation.  
INSERTION LENGTH  
BULB  
M17263  
TUBING  
SPRING CLIP  
Bulb Holders  
Fig. 6. Mounting spring clip into well spud.  
1. Cut a hole large enough to admit the bulb and holder in  
the duct or plenum at the mounting location.  
2. Drill holes for the bulb holder mounting screws.  
3. Mount the bulb and capillary on the holder. See Fig. 9  
through 11.  
Securing Bulb in Wells with Setscrew  
Wells with a spud setscrew are designed for use with  
controllers that have armored capillary with a brass collar at  
the bulb end of the armor. The setscrew tightens against the  
brass collar. See Fig. 7. These wells can be adapted for use  
with 5/64 in. capillary by adding the 124904 Well Adapter and  
the 121371 Mounting Clamp Assembly. See Fig. 3.  
107324A and 131524A Bulb Holders  
Use these bulb holders to mount one bulb in a duct or plenum.  
See Fig. 9 and 10. If necessary, shorten holders by using pliers  
to flex the channel at one of the notches until it separates.  
311266D Bulb Holder  
Use this bulb holder to mount one or two bulbs in a duct where  
temperatures do not exceed 100°F (38°C). The removable  
plug in the mounting plate allows insertion of a thermometer to  
check duct air temperature. See Fig. 11 for installation details.  
M17264  
Fig. 7. Mounting armored capillary in well with setscrew.  
Capillary Compression Fittings  
1. Coat external spud threads with a moderate amount of  
pipe dope, leaving two end threads bare. See Fig. 4.  
NOTE: Teflon tape can also be used.  
PINCH TOP EDGES OF  
HOLDER TOGETHER  
AT EACH SEGMENT  
2. Screw the spud into the tapping and tighten securely.  
3. Place the packing nut on the tubing.  
CAPILLARY  
TUBING  
4. Slide the bulb completely through the fitting.  
5. Place the composition disk and the four slotted brass  
washers on the tubing in the order shown in Fig. 8.  
6. Turn the brass washers so that the slots are 180 degrees  
apart and the small tabs are in the mating slots.  
7. Slide the seal assembly into the fitting. Make sure the  
sensing bulb extends the desired distance into the  
controlled medium. See Fig. 2.  
SENSING  
BULB  
BE SURE EXTENSION TUBE IS  
M7217  
UNDER BULB HOLDER, AS SHOWN  
8. Tighten the packing nut.  
Fig. 9. Installing capillary in 107324A  
and 131524A Bulb Holders.  
1/2 in. (13 mm) PIPE THREAD FOR 1/2 in. (13 mm) CAPSULES  
3/4 in. (19 mm) PIPE THREAD FOR 11/16 in. (17 mm) CAPSULES  
SPUD  
CAPILLARY TUBING  
INDOOR  
BULB  
CAPILLARY  
TUBING  
SCREW  
COMPOSITION DISK  
(SLOTTED)  
HOLES IN  
WALL OF  
PLENUM  
KEEP BULB WELL ABOVE COMBUSTION CHAMBER  
COMBUSTION CHAMBER  
SLOTTED WASHERS  
ASSEMBLED IN PAIRS  
THUS-  
PACKING NUT  
M17258  
M17265  
Fig. 8. Capillary compression fitting assembly.  
Fig. 10. Mounting bulb holder in furnace plenum.  
68-0040—04  
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IMMERSION WELLS AND COMPRESSION FITTINGS  
ELEMENT  
THERMOMETER  
BULB  
CAPILLARY  
TUBING  
3-1/4  
(83)  
1-3/8  
(35)  
14 (356)  
GROMMET  
3-1/4  
(83)  
1-5/8  
(41)  
ADJUSTABLE  
SPRING  
CLIPS (2)  
CONTROLLER BULB  
2-3/4  
(70)  
2-1/4 x 2-1/4 (57 x 57) APPROXIMATE  
HOLE IN DUCT FOR INSTALLATION  
DUCT  
WALL  
ACCESS  
HOLE  
RUBBER GROMET  
NO. 8 SHEET METAL  
MOUNTING SCREWS (2)  
M7355  
WIRE FASTENINGS  
M17269  
Fig. 13. Mounting averaging element with  
perforated strap iron.  
Fig. 11. Mounting sensing bulb and  
311266D Bulb Holder in duct.  
NOTE: Dimensions shown in in. (mm).  
CAPILLARY  
TUBING  
GROMMET  
AVERAGING  
ELEMENT  
Duct Mounting with Capillary Compression  
Fitting  
USE NO. 10  
SHEETMETAL  
SCREWS  
In some duct-mount application, it is desirable to use a  
compression fitting to reduce air leakage at the sensing  
element location. For these applications, first mount a waste  
nut on the duct to ensure secure mounting. See Fig. 12. See  
Table 6 for part numbers.  
314439  
CLIP  
NOTE: Do not use this mounting method for liquid  
applications.  
DUCT  
WALL  
BEND HERE  
IF NECESSARY  
WASTE  
NUT  
DUCT  
WALL  
M17289  
Fig. 14. Mounting averaging element with  
314439 Mounting Clips.  
CAPILLARY  
TUBING  
BULB  
(CAPSULE)  
CAPILLARY  
COMPRESSION  
FITTING  
M17266  
1/2 in. EMT CONDUIT  
(OBTAIN LOCALLY)  
GROMMET  
CAPILLARY  
WIRE TIES  
Fig. 12. Mounting sensing bulb in duct using waste nut  
and compression fitting.  
CONDUIT  
COMPRESSION  
FITTING  
Averaging Element Holders  
The averaging element must be supported so it is distributed  
evenly across the entire height and width of the duct. It can be  
fastened to perforated strap iron (see Fig. 13) or mounted with  
314439 Mounting Clips (see Fig. 14). This type of mounting  
requires threading the element through a grommet inserted in  
a hole in the duct wall.  
4 in.  
COVER  
PLATE  
DUCT  
WALL  
For ducts with limited access, the 7640HX Averaging Element  
Mounting Kit allows mounting the element through a single  
hole in the side of the duct. This kit requires a length of 1/2 in.  
EMT conduit. See Fig. 15.  
AVERAGING  
ELEMENT  
M17270  
Fig. 15. Mounting averaging element with 7640HX  
Averaging Element Mounting Kit.  
11  
68-0040—04  
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IMMERSION WELLS AND COMPRESSION FITTINGS  
Mount the bulb on the pipe as follows:  
Bulb Shields  
A bulb mounted outdoors requires protection of a bulb shield.  
CAUTION  
1. Expose the bulb to representative air temperature but  
not direct sunlight.  
2. Mount it high enough so:  
Significant Calibration Shift Hazard.  
Overtightening clamps distorts bulb calibration.  
Do not overtighten hose clamps.  
a. Accumulated snow, leaves or other debris can-  
not obstruct air circulation around it.  
b. Children cannot reach it.  
1. Secure the bulb to the pipe with a 105900 Pipe Strap or  
metal hose clamps. See Fig. 17 and 18.  
2. If necessary, cover the bulb and pipe with foam rubber  
insulation that extends at least 6 in. (152 mm) beyond  
both ends of the bulb. See Fig. 19.  
c. Avoid vents from the building.  
3. Drill a 3/4 in. (19 mm) hole in the outside wall.  
4. Bring the sensing bulb through the hole.  
5. Mount the bulb in the bulb shield. See Fig. 16.  
6. If the seal-off tube extends outside the shield, bend it  
under the shield.  
7. Hold the shield over the mounting location and form a  
small-radius bend in the tubing.  
IMPORTANT  
Do not allow the duct tape to come into contact with  
the pipe.  
8. Place the split plug (provided with 34886A; or order  
107323A Split Plug separately) around the tubing and  
move the bulb and shield into mounting position as a sin-  
gle unit.  
3. Secure foam rubber with duct tape.  
T-CLAMP  
9. Push the split plug into the hole until it is wedged  
securely in place.  
10. Fasten the shield on the wall with screws (provided with  
34886A).  
CAPILLARY  
TUBING  
11. If the tubing is properly shaped and the split plug  
installed as directed, the shield covers the split plug and  
conceals the hole in the wall.  
BULB  
PLUG HOLE WITH  
ACCEPTABLE MATERIAL  
OUTDOOR  
SENSING  
BULB  
SUPPLY WATER PIPE  
M8836  
Fig. 17. Mounting bulb to pipe with pipe strap.  
3/4 IN. (19 mm)  
HOLE IN WALL  
NOTE: When using a pipe strap, the maximum pipe OD is 3/4  
in.  
CAPILLARY  
TUBING  
EXTENSION  
TUBE  
CAPILLARY TUBE  
M17272A  
BULB SHIELD  
Fig. 16. Mounting bulb in bulb shield.  
M17267  
METAL HOSE CLAMPS  
Strap-On Mounting  
Fig. 18. Mounting bulb to pipe with metal hose clamps.  
Occasionally, applications require the sensing bulb to be  
strapped to the outside of a pipe. For these applications, use  
either the 105900 Pipe Strap or metal hose clamps. The pipe  
strap fits pipe up to 3/4 in. OD.  
FOAM RUBBER WRAP (EXTEND  
CAPILLARY  
TUBE  
DUCT  
TAPE  
6 in. (152 mm) BEYOND ENDS OF BULB)  
External mounting of the sensor produces a slight offset in the  
temperature control point. Typically, the control temperature  
increases as much as 5°F (2.8°C) with a bare sensor strapped  
to the discharge pipe. Applying insulation around the sensor  
and pipe decreases the offset. Insulation must be used if large  
fluctuations in ambient temperature occur near the pipe.  
PIPE  
M17268  
Fig. 19. Covering bulb and pipe with foam rubber  
insulation.  
68-0040—04  
12  
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IMMERSION WELLS AND COMPRESSION FITTINGS  
CHECKOUT  
CROSS REFERENCE  
When installation is complete, check it as follows:  
Some series 121371 Wells are also available without the  
mounting clamp. These pairs are listed together in Table 1 and  
in Table 7for your convenience. The cross reference in Table 8  
lists wells and fittings no longer available and suggests  
functional replacements.  
1. Visually inspect the fittings in hydronic applications for  
leakage.  
2. If necessary, tighten these fittings.  
3. Ensure excess capillary is coiled beneath the controller  
case.  
Table 7. Wells With and Without Mounting Clamp.  
4. Ensure proper operation by observing the system  
through one complete cycle.  
121371 Part Number (With  
Clamp)  
Part Number  
(Less Clamp)  
121371A  
121371B  
121371M  
121371N  
121371P  
121371Q  
121371L  
123869A  
123870A  
123871A  
123871B  
None  
123872A  
13  
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68-0040—04  
   
IMMERSION WELLS AND COMPRESSION FITTINGS  
Table 8. Cross Reference .  
Replacement Part Number  
Old Part  
Number Description  
Notes  
121371G Immersion well. Brass, 1/2-14 NPT, 1-1/2 in. None  
insulation, 6-1/2 in. insertion, includes  
121371 mounting clamp.  
121371N Immersion well. Copper, 3/4-14 NPT, 3 in.  
insulation, 3 in. insertion, includes plastic  
sleeve, 121371 mounting clamp.  
123871B  
No mounting  
clamp.  
122555C Immersion well. Copper, 3/4-14 NPT, 4-1/2 in. 122555B  
insulation, 5 in. insertion.  
4-1/2 in. insulation  
plastic sleeve  
122555F Immersion well. Copper, 3/4-14 NPT, 4-1/2 in. None  
insulation, 5 in. insertion, includes plastic  
sleeve, dual diameter bulb.  
122555G Immersion well. Copper, 3/4-14 NPT, 4-1/2 in. None  
insulation, 5 in. insertion, dual diameter bulb.  
123870E Immersion well. Copper, 3/4-14 NPT, 1-1/2 in. 138134E  
insulation, 3 in. insertion, includes plastic  
2-1/4 in. insulation.  
sleeve, dual diameter capsule.  
123871D Immersion well. Copper, 3/4-14 NPT, 3 in.  
insulation, 3 in. insertion, includes plastic  
sleeve, dual diameter well.  
138134E  
123871E Immersion well. Copper, 3/4-14 NPT, 3 in.  
insulation, 3 in. insertion, dual bulb.  
138134C  
121371L  
123872A Immersion well. Copper, 1/2-14 NPT, 3 in.  
insulation, 3 in. insertion.  
Includes mounting  
clamp.  
104486B Bulb compression fitting. Brass, 1/2-14 NPT. 104484A Capillary Compression  
Fitting or 1/2-14 NPT well with  
correct insertion length and  
diameter.  
3-1/4 insulation  
138134C 2-1/2 in. insulation  
138134D 2-1/2 in. insulation  
138134E  
123871A  
68-0040—04  
14  
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IMMERSION WELLS AND COMPRESSION FITTINGS  
15  
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68-0040—04  
IMMERSION WELLS AND COMPRESSION FITTINGS  
Automation and Control Solutions  
Honeywell International Inc.  
1985 Douglas Drive North  
Golden Valley, MN 55422  
customer.honeywell.com  
Honeywell Limited-Honeywell Limitée  
35 Dynamic Drive  
Toronto, Ontario M1V 4Z9  
® U.S. Registered Trademark  
© 2008 Honeywell International Inc.  
68-0040—04 M.S. Rev. 07-08  
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