Honeywell 121371B - User Manual

PRODUCT DATA
68-0040-04
Immersion Wells and Compression Fittings
FOR TEMPERATURE CONTROLLERS
APPLICATION
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.
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 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
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.
• 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.
• Immersion wells allow heat transfer while
protecting the sensing bulb from contact with the
controlled medium.
• Immersion wells permit removal of the sensing
bulb for testing or replacement without draining
the system.
• Compression fittings seal the boiler and allow
bulb insertion directly into the controlled
medium.
IMMERSION WELL
112632AA
IMMERSION WELL
107324A
ELEMENT
HOLDER
104484A
COMPRESSION FITTING
121371B
Contents
Application ........................................................................ 1
Features ........................................................................... 1
Specifications ................................................................... 2
Ordering Information ........................................................ 2
General Information .......................................................... 7
Installation ........................................................................ 8
Checkout .......................................................................... 13
Cross Reference .............................................................. 13

Summary

Product Features

Specifications

Models and Types

Details available models of immersion wells, compression fittings, and element holders.

Temperature and Pressure Ratings

General Information

Immersion Well Functionality

Explains the construction and function of immersion wells, including heat transfer and protection.

Installation Procedures

Installation Safety Precautions

Highlights hazards like scalding and electrical shock, requiring system draining and power disconnection.

Immersion Well Mounting

Sensing Bulb Insertion and Securing

Details inserting bulbs tightly and using clamps or clips to secure capillaries.

Mounting Clamp Installation

Spring Clip Securing Method

Alternative Bulb Securing and Holders

Setscrew Well Mounting

Duct Mounting with Compression Fittings

Outdoor Bulb Protection

Bulb Shield Installation

Checkout and Cross Reference

Installation Checkout Steps

Lists final checks for proper installation, including leakage inspection and operational verification.

Honeywell 121371B Specifications

General

Control Mode	ON/OFF
Display Type	LED
Input Type	Thermocouple
Output	Relay
Switch Type	SPDT
Operating Temperature	32 to 131 °F
Mounting	Panel