Temptek VETERAN LS Series, Инструкция по эксплуатации

Страница: 41 / 80

Temperature Control Units : With ‘LS’ Series Instrument
Page: 41
TEMPTEK, INC.
525 East Stop 18 Road Greenwood, Indiana 46142
317-887-6352 Fax: 317-881-1277
Service Department Fax: 317-885-8683
www.Temptek.com
A. The unit uses the PVT
TM
; (Pulsed
Valved Technology) solenoid
valve (figure 5.3A) as the cooling
valve. The solenoid valve is
controlled by the instrument.
B. Generally, the PVT
TM
valve may
fail due to poor water quality, low
water flow, or defective valve
components.
C. The operator should follow this
procedure to service the PVT
TM
;
valve.
1. Disengage process operations according to the procedure
outlined in section 3.4. The operator must be certain
process fluid temperature is under 100°F and pressure is
relieved (pressure gauge reads “0”).
2. Disengage main power supply. The operator must verify the
Power light on the display is “off”.
3. Remove or open any access cover panel and set aside to
gain access to the solenoid valve.
4. Identify the retaining screw (figure 5.3B) on the solenoid
valve coil. Remove the screw. Keeping all electrical
connections intact, lift the coil off of the enclosure tube and
set aside.
5. Use a pair of channel lock pliers or a pipe wrench to
separate the bonnet assembly from the valve body. The
plunger is “loose” inside the enclosing tube. Be certain it
is retained in the enclosure tube as the bonnet is removed
(figure 5.3C).
6. Identify the diaphragm assembly. Gently remove the
assembly from the valve body (figure 5.3D).
7. Identify the mesh screen. Gently remove the mesh screen
and clean or replace as necessary.
8. Clean the valve body.
9. Reset the mesh screen into the valve body.
10. If a new diaphragm assembly was obtained, continue with
step 12. If not, disassemble the diaphragm assembly and
note component order (figure 5.3E). Clean the valve port,
plate, collar and O-ring. Once cleaned, reassemble the
diaphragm.
11. Set the reassembled diaphragm assembly or the new
Typical PVT
TM
valve
Figure 5.3A