Module power and miscellaneous i/o, Ƽ caution prevent injury – Trane RTWA 70-125 TON User Manual
Page 65
RLC-SVD03A-EN
65
Module Power and Miscellaneous I/O
2.
Disconnect all the line voltage to the power supply of this unit.
3.
Refer to the exploded view in
while performing the remaining
instructions.
ƽ CAUTION
Prevent Injury!
. The pushrod is under spring pressure and will
be accelerated out of the top or bottom of the valve body
assembly if the activator assembly or bottom cap is removed.
When unscrewing either the activator assembly or bottom cap,
make sure these assemblies are kept in line with the valve body
and moved away from the valve body very slowly in the vertical
direction, until you feel the pressure is relieved from the pushrod.
At this time hold the pushrod with one hand and then move the
activator or bottom cap away from the valve body. * Do not try to
remove either the activator assembly or bottom cap under any
system pressure. System pressure must be at 0 psig on both
sides of the valve before attempting any disassembly of
this valve. Failure to slowly relieve spring pressure may result in
minor to moderate injury.
4.
Remove the actuator assembly from the valve body using large hex nut to
turn.
5.
Remove pushrod and check for excessive wear or scratches. The pushrod
must move freely in the valve body.
6.
Remove the bottom cap, spring and piston. Inspect these parts for for-
eign matter and physical damage.
7.
Clean all parts with a suitable solvent and blow dry with clean com-
pressed air.
8.
To reassemble, carefully install the piston, spring and bottom cap. Be
sure that the piston nose guides are on the inside diameter of the port.
The seating surface may be damaged if the piston is improperly
installed.
9.
Check that the sealing surfaces are free of foreign material or nicks that
may prevent a leak-tight joint. Tighten the bottom cap approximately 1/8
turn past hand tight to seal the knife edge joint.
10. Place the pushrod in the valve body. Press the pushrod down to open the
valve and insure proper piston installation. Approximately 8 ft.-lbs. are
required to open the valve. If the valve cannot be opened, repeat steps 9
and 10.
Clean with a suitable solvent, blow dry with clean compressed air and
replace the pushrod in the valve body.
11. Before replacing the actuator assembly, be sure that all sealing surfaces
are free of foreign material or nicks that may prevent a leak-tight joint.
Carefully install the pushrod bonnet and thread the actuator assembly on