Repairs And Replacement - Johnson Controls GM 20 Series Installation Sheets Manual

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Repairs and Replacement

Field repairs must not be made, except to replace the filter or strainer. For
a replacement part, contact the nearest Johnson Controls representative or
the original equipment manufacturer.
!
CAUTION: Label all wires prior to disconnection when servicing
Perform the following steps to replace the filter or strainer.
1. Clean or replace the filter or strainer with each recommended
inspection or at a minimum each annual functional inspection.
2. Close the main manual shutoff valve and disconnect field wiring. As
each wire is disconnected, label it with the correct terminal
designation.
3. Remove the screws on the flanges and remove the valve and filter
plate.
4. Clean or replace the filter or strainer. Reinstall the filter plate and
valve.
5. Refasten the flange screws to the valve and reconnect field wiring.
!
WARNING: Fire or explosion hazard. Verify that the valve
6. Open the pressure connection between the manual shutoff valve and
the GM valve.
7. Connect air tubing with a maximum pressure of 1-1/2 times the
valve's maximum operating pressure (as indicated on the valve) to the
opened pressure connection.
G—GM-20/25 and GM-40/45 Series Dual-block Multi-function Gas Control Valves Technical Bulletin 19
valves. Wiring errors can cause improper and
dangerous operation. Verify proper operation after
servicing.
functions properly and there are no gas leaks. Follow
this checkout procedure before leaving the installation.
Failure to verify proper valve installation, equipment
operation, and gas tight connections may result in fire,
explosion, property damage, and injuries or death.