Installation Sheets Manual 121
Gas Combustion Combination Controls and Systems G
Technical Bulletin G77x
Issue Date 0600
© 2000 Johnson Controls, Inc.
1
Part No. 24-8143-588, Rev. A www.johnsoncontrols.com
Code No. LIT-121250
Figure 1: G77x Intermittent Pilot Ignition Controls
The G77x family of controls is designed for indirect ignition of natural
gas, Liquefied Petroleum (LP) gas, manufactured gas, mixed gas, or
LP gas-air mixtures.
Following are the application requirements of the G77x control.
•
The G77x can be used on gas-fired equipment with a maximum firing
rate of 117 kW (400,000 Btu/hr). Any application over 117 kW
(400,000 Btu/hr) must have written approval in advance from the
Johnson Controls Heating Products Engineering Department.
•
All G77x applications must use a redundant gas valve system where
the pilot and main valve seats are in series and opened in sequence for
intermittent pilot ignition.
G77x Intermittent Pilot Ignition Controls
Description
Application
Requirements
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