Honeywell Q340A User Manual

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Copyright © 2001 Honeywell • All Rights Reserved
INSTALLATION INSTRUCTIONS
95- 6794- 1
Q340A
Thermocouple
APPLICATION
The Q340A Thermocouple is a single-junction
thermocouple lead which provides a 30 mV electrical
signal when the pilot is operating. Loss of the pilot
removes the electrical current and shuts off the gas
supply to the burner.
SPECIFICATIONS
Temperature Ratings:
Hot Junction area: 1400°F (760°C).
Cold Junction Area: 780°F (416°C).
Lead Lengths:
18 in. (0.5 m) to 48 in. (1.2 m) are available.
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 technician.
4.
After installation is complete, check out product
operation as provided in these instructions.
WARNING
Fire or Explosion Hazard.
Can cause property damage, serious
injury or death.
Make sure the gas supply to the burner is turned
off before removing or installing the
thermocouple.
Replacement Installation
1.
Disconnect and remove the old thermocouple.
2.
Determine the type of thermocouple mount:
a. Screw-in type.
b. Clamp type.
c. Push-in type.
3.
Follow the applicable installation instructions in
Fig. 1.
Fig. 1. Q340 Thermocouple installation.
SCREW-IN TYPE CLAMP TYPE
PUSH-IN TYPE
Insert
thermocouple
in pilot
burner
Tighten nut
Slip nut
off adapter
and clamp
thermocouple
in pilot burner
with shoulder
above clamp,
as shown
Remove
adapter,
insert
thermocouple
in pilot
burner
M629

Honeywell Q340A Specifications

General

Type	Thermocouple
Hot Junction	Exposed
Response Time	<1 second
Operating Humidity	Suitable for typical appliance environments
Power Supply	Self-powered (thermocouple principle)
Sensor Type	Thermocouple (typically Iron-Constantan or Chromel-Alumel)

Summary

Application

Specifications

Temperature Ratings

Specifies maximum operating temperatures for the hot and cold junction areas of the thermocouple.

Lead Lengths

Details the available lengths for the thermocouple lead.

Installation

Installation Precautions and Safety

Read instructions, check ratings, use qualified technician, and observe safety warnings for fire or explosion.

Replacement Installation Process

Steps for disconnecting the old thermocouple and determining the mount type for replacement.

Thermocouple Mounting Methods

Illustrates the three types of thermocouple mounts: Screw-in, Clamp, and Push-in.

Completing the Connection

Connecting to Safety Control

Connect the other end to the safety control, ensuring a clean and dry connection without thread compound.

Connection Tightening and Grounding

Secure connection screws and connect limit control wires or jumper terminals if no limit control is used.

Final Startup Procedure

Turn on gas supply, light pilot, wait one minute, then turn on the main burner.