TM 10-4610-232-12
Table 4-2. Unit Troubleshooting Guide (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
AUTOMATIC VALVES.
CAUTION
(MODEL WTA-060 ONLY)
Whenever an automatic valve assembly (valve and actuator) is removed from the piping it must be
reinstalled with the valve disc open. Attach the air tubing and electrical connector after the valve assembly
is Installed in the piping. the actuator is removed from the valve it must be reinstalled with its air and
electrical connection removed from it. Additionally, the maintainer must determine that the valve itself Is
open. This can be done either by removing the valve from the piping to check it, or, by looking at the
bottom of the valve housing and noting the position of the groove on the end of the valve stem. The
groove is in alignment with the inner valve disc. Turn the square end of the valve stem a quarter turn to
make the groove point towards the inlet/outlet openings on the valve and then installing the actuator.
Failure to follow these procedures will result in the valve operating opposite to what it was meant to do in
the system.
NOTE
(MODEL WTA-060 ONLY)
The automatic valves on the ROWPU are spring loaded open and air pressure closed. The electrical
system controls whether air is, or, is not supplied to the valve. In the event of an electrical circuit or air
system failure the valves will automatically open. The actual position of a valve can be determined by
removing the plastic valve cap and observing the position of the stem: if the stem Is extended out from
the top of the actuator housing, it is closed; if it is sitting on the top of the actuator housing, it is open.
CAUTION
(MODEL ROWPU-1 ONLY)
Whenever an automatic valve assembly (valve and actuator) is removed from the piping, it must be
reinstalled with the valve disc open. Attach the air tubing and electrical connector after the valve assembly
is installed in the piping. If the actuator is removed from the valve it must be reinstalled with its air and
electrical connection removed from it. Additionally, the maintainer must determine whether the valve itself
is open. The actual position of the valve can be determined by looking at the position indicator at the
bottom of the actuator.
NOTE
(MODEL ROWPU-1 ONLY)
The automatic valves on the ROWPU are spring loaded open and air pressure closed. The electrical
system controls whether air is, or, is not supplied to the valve. In the event of an electrical circuit or
system failure the valves will automatically open. The actual position of the valve can be determined by
looking at the position indicator at the bottom of the actuator.
Change 7 4-50.1/ (4-50.2 Blank)
