Johnson Controls GH-5000 Manual page 12

130 4280 010 E
Repairs and Replacement
WARNING: All repairs, adjustments and servicing must be made in conjunction with the gas
appliance and in accordance with the appliance manufacturer's instructions. Only authorized
personnel should make adjustments in accordance with the regulations in force.
Field repairs must not be made, except to replace the filter, valve seat plug, gasket, terminal box, or actuator.
For a replacement part, contact the nearest Johnson Controls representative or the original equipment
manufacturer.
WARNING: Fire or explosion hazard. Shut off the gas supply at the main manual shutoff valve before
servicing the valve.
Only a trained service professional should perform these repair or replacement procedures.
Valve Servicing
Follow the model-specific procedure to service the valve. Perform this procedure with each recommended
inspection or at a minimum each annual functional inspection.
DN 40-80 Flanged Body and All Threaded Body Models
•
Close the upstream shutoff cock and disconnect power to the actuator.
CAUTION: Personal injury hazard. The valve cover contains a compressed spring. Improper
disassembly could cause the valve cover and spring to fly off resulting in personal injury or equipment
damage.
•
Remove two diagonally opposed mounting screws from the bottom valve cover and replace them with
two long bolts with screwed-on nuts. See Table 5 for bolt dimensions. Screw the nuts down against the
valve cover.
Valve Model
DN 40 flanged body
DN 50 flanged body
DN 65 & DN 80 flanged body
Rp ¾ to 1 ½ threaded body
Rp 2 threaded body
Rp 2 ½ to 3 threaded body
Table 2: Bolt dimensions
•
With the two bolts in place, remove the other two mounting screws.
•
Uniformly back off the nuts of the two bolts to lower the valve cover and relax the spring. See Table 2 for
approximate distance required to fully relax the spring.
•
With the spring relaxed, remove the two bolts, valve cover, valve spring, valve seat plug, and filter. Refer to
model-specific figures (Figure 4) for part identification.
•
Clean or replace valve seat plug, filter, and gasket. (Figure 4)
•
Check the surface of the valve seat plug. If the seat plug or seal is damaged in anyway, replace it. Contact
Johnson Controls for replacement part numbers.
•
Ensure that the valve seat plug bore is free of foreign matter before installing it on the valve stem. Re-insert
valve seat plug, filter, and gasket.
Johnson Controls SA/NV - Leuvensesteenweg 248D - B-1800 Vilvoorde - +32(2) 709 40 00 - www.johnsoncontrols.be
Page:12
Bolt Distance to relax spring(s)
M 6 x 60 approx. 55 mm
M 8 x 80 approx. 70 mm
M 8 x 70 approx. 50 mm
M 6 x 60 approx. 55 mm
M 8 x 80 approx. 70 mm
M 8 x 70 approx. 50 mm