Honeywell HON 670 Component Documentation, Maintenance Manual And Spare Parts page 20

Tightening torques
Replace O-rings of the
baseplate
HON 670 / HON 671 Controllers Component Documentation
Observe the tightening torques below when following the instructions in this section:
Part Tightening torque
Screws of pilot spring 12 Nm (9 ft lbs)
cover
Cap nut 20 Nm (15 ft lbs)
Hex nut 20 Nm (15 ft lbs)
Baseplate screws 12 Nm (9 ft lbs)
Screws of bottom cover 12 Nm (9 ft lbs)
Proceed as follows:
Figure
Step Task
4 Replace the O-ring of the pilot
spring cover
5 Assembling the double dia-
phragm system
6 Assembling the double dia-
phragm system
7 Mounting the controller
8 Mounting the controller
Step Description
Unscrew the 4 screws (1) on the
1
baseplate.
2 Remove the baseplate (1).
3 Replace the 4 O-rings (1) with 4 new,
lubricated O-rings. Bear in mind that the
O-rings differ.
Note: See the appendix for the lubricants
to be used.
Maintenance
20