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Installation Sheets Manual 121

Gas Ignition Controls and Devices Section J

Technical Bulletin

Issue Date 0497

Part No. 20007-240-6

Code No. LIT-121310

This document is intended to aid the appliance engineer or authorized

service contractor in making a standing pilot application. Pilot burners are

manufactured with a variety of tips and mounting configurations.

Representative types of mounting with standard pilots are illustrated in

Figure 1. Dimensions shown are approximate and may vary, provided the

requirements of good ignition are met. See Good Practice Rules.

The following are good practice rules for governing the location of the

pilot:

• Locate the pilot so that it can be reached easily for lighting.

• Locate the pilot in a position that has a fixed relation to the main

burner (see Figure 1).

Pilot Ignition Port 3/8" Above

and 1/4" Away (Or Closer)

from Center of Nearest Main

Burner Port

Mounting Position Examples for Pilot Burners

pilot

Figure 1: Pilot Location

• Locate the pilot burner in a position that will receive incoming air and

not products of combustion from the main burner. The pilot should

be located where it will not be affected by an excessive draft of

incoming air.

• Locate the pilot burner in such a position that it does not receive the

full force of igniting or extinguishing puffs from the main burner.

• Locate the pilot burner in a position that will allow ready removal for

cleaning.

Pilot Burners/Thermocouples

Application

Good Practice

Rules

Summary of content (8 pages)

PAGE 1
Installation Sheets Manual 121 Gas Ignition Controls and Devices Section J Technical Bulletin Issue Date 0497 Pilot Burners/Thermocouples Application This document is intended to aid the appliance engineer or authorized service contractor in making a standing pilot application. Pilot burners are manufactured with a variety of tips and mounting configurations. Representative types of mounting with standard pilots are illustrated in Figure 1.
PAGE 2
After Installation When the pilot burner has been installed, carefully make the following observations and tests: 1. Ensure the main burner flames do not impinge on any part of the pilot burner. 2. Ensure the pilot burner will ignite the main burner under all pilot burner conditions that maintain the safety shutoff device (BASO) in the On position. (See the Safety Turn Down Test section.) 3. Ensure the pilot burner will not be smothered out or snuffed out: 4.
PAGE 3
Table 1: Thermocouple Output Table Thermocouple Lead Series Code Number Number Safety Turn Down Test Turn Down Test with the Use of the Y99AB Test Kit Turn Down (mV) Open Circuit Range (mV) Minimum Fixed Load Voltage (mV) K14 80 4 20 - 28 8 K15 88D, 88F, 88J, 88E, 88H 4 20 - 28 8 K16 87D, 87F, 87K, J87D, K16K, L87D, N87D, K16S, JC87F, L87F 4 25 - 35 8 K19 K19 4 25 - 35 8 ! WARNING: Fire or Explosion Hazard.
PAGE 4
2. Reduce the flame on the pilot through the use of the “B” valve to the point where the open circuit millivoltage reading is not more than 4 millivolts. 3. Cycle the main burner On and Off at least three times. The main burner must ignite each time within four seconds. If you cannot secure ignition of the main burner when the millivoltage reading is 4 millivolts, the pilot has been located improperly with respect to the main burner. Relocate the pilot; repeat Steps 2 and 3.
PAGE 5
. If you cannot secure ignition of the main burner when the pilot flame has been reduced to the point at which the BASO drops out, the pilot has been located too far from the main burner and must be moved closer. Repeat Steps 2, 3, and 4. Observe the pilot flame under the various test conditions and ensure it appears stable at all times. Use a millivolt meter to determine the stability of the pilot flame.
PAGE 6
Notes 6 Pilot Burners/Thermocouples Technical Bulletin
PAGE 7
Notes Pilot Burners/Thermocouples Technical Bulletin 7
PAGE 8
Notes Controls Group 507 E. Michigan Street P.O. Box 423 Milwaukee, WI 53201 8 Pilot Burners/Thermocouples Technical Bulletin FAN 121 Installation Sheets Manual Printed in U.S.A.