Honeywell Q340A Installation Manual

Q340A

Thermocouple

INSTALLATION INSTRUCTIONS

APPLICATION

The Q340A Thermocouple is a single-junction thermocouple lead which provides a 30 mV electrica l signal when the pilot is operating. Loss of the pilot removes the electrical curr ent 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…

Read these instructions carefully. Failure to follow

them could damage the product or cause a hazardous condition. Check the ratings given in the instructions and on

the product to make sure the product is suitable for your application. Installer must be a trained, experienced technician.

After installation is complete, check out product

operation as provided in these instructions.

WARNING

Fire or Explosion Hazard. Can cause property damage , seri ous injury or death.

Make sure the gas supply to the burner is turned off before removing or installing the thermocouple.

Replacement Installation

Disconnect and remove the old thermocouple.

Determine the type of thermocouple mount :

a. Screw-in type. b. Clamp type. c. Push-in type. Follow the applicable installation instru ctions in

Fig. 1.

SCREW-IN TYPE CLAMP TYPE

Insert

thermocouple

in pilot burner

Tighten nut

M629

Fig. 1. Q340 Thermocouple inst allation.

Slip nut

off adapter

and clamp thermocouple in pilot burner with shoulder

above clamp,

as shown

PUSH-IN TYPE

thermocouple

New Installation

Determine the type of thermocouple mount (see

step 2 in Replacement Installation). Follow the applicable instructions in Fig. 1.

Completing the Connection

Connect the other end of the thermocouple to the

safety control. Do not use thread compound; the connection must be clean and dry.

CAUTION

Equipment Damage Hazard. Too much torque will damage the connection.

Tighten connector only 1/4 in. turn beyond finger-tight for good electrical continu ity. Further tightening can result in damage.

Remove adapter,

insert

in pilot burner

95-6794-1

Q340A THERMOCOUPLE

Make sure to tighten all connection screws

securely. Connect the limit control wires to the thermocouple

junction block terminals. If no limit control is used, jumper the terminals on the junction block with heavy gauge wire.

Turn on the gas supply and light the pilot light.

Wait one minute and turn on the main burner.

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Honeywell Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Scarborough, Ontario

95-6794—1 G.R. Rev. 4-01 www.honeywell.com

M1V 4Z9

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